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Commitments and Contingencies | 6 Months Ended
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Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies | 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 2020 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, 2021 |  | December 31, 2020
Commitments to extend credit | $ | 10,185,687 |  |  | $ | 9,814,475 |
Standby letters of credit | 210,210 |  |  | 241,345 |
Deferred standby letter of credit fees | 1,814 |  |  | 1,723 |
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 2020 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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | $ | 44,217 |  |  | $ | 42,164 |  |  | $ | 44,152 |  |  | $ | 500 |
Impact of adopting ASC 326 | — |  |  | — |  |  | — |  |  | 39,377 |
Credit loss expense | 4,379 |  |  | 4,775 |  |  | 4,444 |  |  | 7,062 |
Ending balance | $ | 48,596 |  |  | $ | 46,939 |  |  | $ | 48,596 |  |  | $ | 46,939 |
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization of lease right-of-use assets | $ | 8,129 |  |  | $ | 8,150 |  |  | $ | 16,412 |  |  | $ | 16,024 |
Short-term lease expense | 530 |  |  | 610 |  |  | 734 |  |  | 1,171 |
Non-lease components (including taxes, insurance, common maintenance, etc.) | 2,337 |  |  | 2,897 |  |  | 5,341 |  |  | 5,824 |
Total | $ | 10,996 |  |  | $ | 11,657 |  |  | $ | 22,487 |  |  | $ | 23,019 |
Right-of-use lease assets totaled $281.9 million at June 30, 2021 and $292.1 million at December 31, 2020 and are reported as a component of premises and equipment on our accompanying consolidated balance sheets. The related lease liabilities totaled $313.4 million at June 30, 2021 and $323.0 million at December 31, 2020 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 $8.0 million and $16.1 million during the three and six months ended June 30, 2021 and $8.1 million and $15.8 million during the three and six months ended June 30, 2020. There has been no significant change in our expected future minimum lease payments since December 31, 2020. See the 2020 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.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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