Commitments and Contingent Liabilities In the normal course of business, the Company enters into various transactions which, in accordance with US GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit which involve, to varying degrees, elements of credit and interest rate risk. Credit losses up to the face amount of these instruments could occur, although material losses are not anticipated. The Companys credit policies applied to loan originations are also applied to these commitment requests, including obtaining collateral at the exercise of the commitment. The contractual amounts of financial instruments with off-balance sheet risk at June 30, 2019 and December 31, 2018 , are summarized below. Please see Part I-Item 2-Off-Balance Sheet Arrangements, Contractual Obligations and Commitments of this Form 10-Q for information related to commitment maturities. June 30, 2019 December 31, 2018 Unused commitments to extend credit $ 1,785,281 $ 1,850,351 Unused capacity on Warehouse Purchase Program loans 620,316 967,096 Standby letters of credit 61,853 46,383 Total unused commitments/capacity $ 2,467,450 $ 2,863,830 Unused commitments to extend credit - The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Company. Substantially all of the Companys commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of future loan funding. Unused capacity on Warehouse Purchase Program loans - In regard to unused capacity on Warehouse Purchase Program loans, the Company has established maximum purchase facility amounts, but reserves the right, at any time, to refuse to buy any mortgage loans offered for sale by each customer, for any reason in the Companys sole and absolute discretion. Standby letters of credit - Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In addition to the commitments above, the Company guarantees the credit card debt of certain customers to the merchant bank that issues the credit cards. These guarantees are in place for as long as the guaranteed credit card is open. At June 30, 2019 and December 31, 2018 , these credit card guarantees totaled $2,223 and $1,973 , respectively. This amount represents the maximum potential amount of future payments under the guarantee, which the Company is responsible for in the event of customer non-payment. The Company funds an allowance for credit losses on off-balance sheet lending-related commitments and guarantees on credit card debt through a charge to provision for credit losses on the Companys consolidated statement of income. At June 30, 2019 and December 31, 2018 , this allowance for credit losses on off-balance sheet lending-related commitments and guarantees on credit card debt, included in other liabilities on the Companys consolidated balance sheets, totaled $667 and $729 , respectively. In addition to the commitments above, the Company had overdraft protection available in the amounts of $83,507 and $84,504 at June 30, 2019 and December 31, 2018 , respectively. The Company, at June 30, 2019 and December 31, 2018 , had FHLB letters of credit of $889,480 and $932,200 , respectively, pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. At June 30, 2019 and December 31, 2018 , the Company had $730 and $830 , respectively, of unfunded commitments recorded in other liabilities in its consolidated balance sheet related to investments in community development-oriented private equity funds used for Community Reinvestment Act purposes.