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Commitments and Contingencies
 6 Months Ended
Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Commitments Contingencies and Guarantees Off-Balance-Sheet Arrangements, Commitments, Guarantees and Contingencies
Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we enter into various transactions, which, in accordance with generally accepted accounting principles are not included in our consolidated balance sheets. We enter into these transactions to meet the financing needs of our customers. As more fully discussed in our 2021 Form 10-K, these transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. We minimize our exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures.
Financial instruments with off-balance-sheet risk were as follows:
June 30,
2022		December 31,
2021
Commitments to extend credit$10,771,940 $10,420,142 
Standby letters of credit327,847 238,690 
Deferred standby letter of credit fees1,890 2,072 
Allowance For Credit Losses - Off-Balance-Sheet Credit Exposures. The allowance for credit losses on off-balance-sheet credit exposures is a liability account, calculated in accordance with ASC 326, representing expected credit losses over the contractual period for which we are exposed to credit risk resulting from a contractual obligation to extend credit. No allowance is recognized if we have the unconditional right to cancel the obligation. Off-balance-sheet credit exposures primarily consist of amounts available under outstanding lines of credit and letters of credit detailed in the table above. The amount of the allowance represents management's best estimate of expected credit losses on commitments expected to be funded over the contractual life of the commitment. Our allowance methodology is more fully described in our 2021 Form 10-K.
The following table details activity in the allowance for credit losses on off-balance-sheet credit exposures.
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Beginning balance$45,850 $44,217 $50,314 $44,152 
Credit loss expense (benefit)4,396 4,379 (68)4,444 
Ending balance$50,246 $48,596 $50,246 $48,596 
Lease Commitments. We lease certain office facilities and office equipment under operating leases. The components of total lease expense were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Amortization of lease right-of-use assets$8,209 $8,129 $16,314 $16,412 
Short-term lease expense490 530 1,103 734 
Non-lease components (including taxes, insurance, common maintenance, etc.)2,748 2,337 5,768 5,341 
Total$11,447 $10,996 $23,185 $22,487 
Right-of-use lease assets totaled $278.3 million at June 30, 2022 and $281.4 million at December 31, 2021 and are reported as a component of premises and equipment on our accompanying consolidated balance sheets. The related lease liabilities totaled $310.5 million at June 30, 2022 and $313.4 million at December 31, 2021 and are reported as a component of accrued interest payable and other liabilities in the accompanying consolidated balance sheets. Lease payments under operating leases that were applied to our operating lease liability totaled $8.4 million and $16.4 million during the three and six months ended June 30, 2022, respectively, and $8.0 million and $16.1 million during the three and six months ended June 30, 2021, respectively. There has been no significant change in our expected future minimum lease payments since December 31, 2021. See the 2021 Form 10-K for information regarding these commitments.
Litigation. We are subject to various claims and legal actions that have arisen in the course of conducting business. Management does not expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.