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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 246,473 | $ 352,402 | $ 256,421 | $ 388,640 |
Provision for loan losses | (6,158) | (25,064) | (10,125) | (46,834) |
Loans charged off | (1,368) | (18,304) | (9,173) | (35,209) |
Recoveries of loans previously charged off | 2,167 | 2,856 | 3,991 | 5,293 |
Ending balance | 241,114 | 311,890 | 241,114 | 311,890 |
Provision Details [Abstract] |  |  |  |  |
Change in provision due to loan growth and changes in economic outlook offset by sustained trend of improving credit quality metrics. | 305 |  |  |  |
Other changes to provision | (458) |  |  |  |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 36,245 | 32,877 | 32,977 | 36,921 |
Provision for off-balance sheet credit risk | 6,005 | (8,590) | 9,273 | (12,634) |
Ending balance | 42,250 | 24,287 | 42,250 | 24,287 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 21,177,009 |  | 21,177,009 |  | $ 20,071,621
Individually measured for impairment, recorded investment | 114,139 |  | 114,139 |  | 134,059
Total | 21,291,148 |  | 21,291,148 |  | 20,205,680
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 237,826 |  | 237,826 |  | 250,079
Individually measured for impairment, related allowance | 3,288 |  | 3,288 |  | 6,342
Total | 241,114 |  | 241,114 |  | 256,421
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 151,448 | 231,372 | 162,056 | 254,934 |
Provision for loan losses | (15,468) | (18,442) | (20,586) | (28,335) |
Loans charged off | (6) | (16,502) | (6,087) | (31,847) |
Recoveries of loans previously charged off | 1,588 | 1,875 | 2,179 | 3,551 |
Ending balance | 137,562 | 198,303 | 137,562 | 198,303 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 13,966 | 12,736 | 13,812 | 14,422 |
Provision for off-balance sheet credit risk | 1,873 | (2,642) | 2,027 | (4,328) |
Ending balance | 15,839 | 10,094 | 15,839 | 10,094 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 13,524,089 |  | 13,524,089 |  | 12,432,361
Individually measured for impairment, recorded investment | 54,608 |  | 54,608 |  | 74,104
Total | 13,578,697 |  | 13,578,697 |  | 12,506,465
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 135,209 |  | 135,209 |  | 158,063
Individually measured for impairment, related allowance | 2,353 |  | 2,353 |  | 3,993
Total | 137,562 |  | 137,562 |  | 162,056
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 58,974 | 81,746 | 58,553 | 86,558 |
Provision for loan losses | 4,085 | (10,582) | 4,553 | (15,161) |
Loans charged off | (78) | (800) | (269) | (1,063) |
Recoveries of loans previously charged off | 16 | 176 | 160 | 206 |
Ending balance | 62,997 | 70,540 | 62,997 | 70,540 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 20,465 | 18,298 | 17,442 | 20,571 |
Provision for off-balance sheet credit risk | 4,205 | (5,950) | 7,228 | (8,223) |
Ending balance | 24,670 | 12,348 | 24,670 | 12,348 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 4,095,209 |  | 4,095,209 |  | 3,817,063
Individually measured for impairment, recorded investment | 10,939 |  | 10,939 |  | 14,262
Total | 4,106,148 |  | 4,106,148 |  | 3,831,325
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 62,062 |  | 62,062 |  | 56,204
Individually measured for impairment, related allowance | 935 |  | 935 |  | 2,349
Total | 62,997 |  | 62,997 |  | 58,553
Paycheck Protection Program [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Loans charged off | 0 | 0 | 0 | 0 |
Recoveries of loans previously charged off | 0 | 0 | 0 | 0 |
Ending balance | 0 | 0 | 0 | 0 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |
Provision for off-balance sheet credit risk | 0 | 0 | 0 | 0 |
Ending balance | 0 | 0 | 0 | 0 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 43,140 |  | 43,140 |  | 276,341
Individually measured for impairment, recorded investment | 0 |  | 0 |  | 0
Total | 43,140 |  | 43,140 |  | 276,341
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 0 |  | 0 |  | 0
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 36,051 | 39,284 | 35,812 | 47,148 |
Provision for loan losses | 5,225 | 3,960 | 5,908 | (3,338) |
Loans charged off | (1,284) | (1,002) | (2,817) | (2,299) |
Recoveries of loans previously charged off | 563 | 805 | 1,652 | 1,536 |
Ending balance | 40,555 | 43,047 | 40,555 | 43,047 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 1,814 | 1,843 | 1,723 | 1,928 |
Provision for off-balance sheet credit risk | (73) | 2 | 18 | (83) |
Ending balance | 1,741 | $ 1,845 | 1,741 | $ 1,845 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 3,514,571 |  | 3,514,571 |  | 3,545,856
Individually measured for impairment, recorded investment | 48,592 |  | 48,592 |  | 45,693
Total | 3,563,163 |  | 3,563,163 |  | 3,591,549
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 40,555 |  | 40,555 |  | 35,812
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | $ 40,555 |  | $ 40,555 |  | $ 35,812

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