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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract] |
Financial Instruments with Off-Balance-Sheet Risk | Financial instruments with off-balance-sheet risk were as follows:
| September 30, 2023 |  | December 31, 2022
Commitments to extend credit | $ | 12,053,260 |  |  | $ | 12,137,957 |
Standby letters of credit | 370,718 |  |  | 383,851 |
Deferred standby letter of credit fees | 1,972 |  |  | 2,236 |
Commitments, Off-Balance-Sheet, Allowance for Credit Losses [Table Text Block] | The following table details activity in the allowance for credit losses on off-balance-sheet credit exposures.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Beginning balance | $ | 52,881 |  |  | $ | 50,246 |  |  | $ | 58,593 |  |  | $ | 50,314 |
Credit loss expense (benefit) | (2,466) |  |  | 2,463 |  |  | (8,178) |  |  | 2,395 |
Ending balance | $ | 50,415 |  |  | $ | 52,709 |  |  | $ | 50,415 |  |  | $ | 52,709 |
Lease Commitments, Components of Lease Expense [Table Text Block] | We lease certain office facilities and office equipment under operating leases. The components of total lease expense were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Amortization of lease right-of-use assets | $ | 8,220 |  |  | $ | 8,389 |  |  | $ | 25,732 |  |  | $ | 24,703 |
Short-term lease expense | 852 |  |  | 536 |  |  | 1,754 |  |  | 1,639 |
Non-lease components (including taxes, insurance, common maintenance, etc.) | 3,269 |  |  | 3,092 |  |  | 10,312 |  |  | 8,860 |
Total | $ | 12,341 |  |  | $ | 12,017 |  |  | $ | 37,798 |  |  | $ | 35,202 |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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