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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Financial Instruments with Off-Balance-Sheet Risk | 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 |
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 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, 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 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 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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