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Federal and State Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred tax assets [Abstract] |  |  |
Credit loss reserves | $ 67,339 | $ 101,265 |
Lease liability | 48,457 | 44,794 |
Deferred compensation | 33,945 | 29,504 |
Unearned fees | 11,368 | 14,584 |
Purchased loan discount | 7,498 | 11,537 |
Share-based compensation | 5,989 | 6,525 |
Valuation adjustments | 1,883 | 3,834 |
Other | 28,958 | 29,963 |
Total deferred tax assets | 205,437 | 242,006 |
Valuation Allowance [Abstract] |  |  |
Valuation allowance | 0 | 0 |
Deferred tax liabilities [Abstract] |  |  |
Available for sale securities mark to market | 21,841 | 105,769 |
Right-of-use asset | 41,291 | 38,635 |
Mortgage servicing rights | 31,703 | 24,182 |
Acquired identifiable intangible | 14,307 | 18,138 |
Depreciation | 10,939 | 13,754 |
Lease financing | 11,120 | 11,828 |
Other | 39,698 | 39,210 |
Total deferred tax liabilities | 170,899 | 251,516 |
Net deferred tax assets, net | 34,538 |  |
Net deferred liabilities, net |  | (9,510) |
Current income tax expense [Abstract] |  |  |
Federal | 121,196 | 173,888 | $ 110,887
State | 21,065 | 29,889 | 15,088
Total current income tax expense | 142,261 | 203,777 | 125,975
Deferred income tax expense [Abstract] |  |  |
Federal | 29,777 | (65,989) | 3,416
State | 7,737 | (8,995) | 792
Total deferred income tax expense (benefit) | 37,514 | (74,984) | 4,208
Total income tax expense | 179,775 | 128,793 | 130,183
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal statutory tax | 167,181 | 118,412 | 132,482
Tax exempt revenue | (6,084) | (7,035) | (12,227)
Effect of state income taxes, net of federal benefit | 22,489 | 14,251 | 12,715
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (8,801) | (6,994) | (5,127)
Other, net | 4,990 | 10,159 | 2,340
Total income tax expense | $ 179,775 | $ 128,793 | $ 130,183
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal statutory tax (in thousandths) | 21.00% | 21.00% | 21.00%
Tax exempt revenue (in thousandths) | (0.70%) | (1.20%) | (1.90%)
Effect of state income taxes, net of federal benefit (in thousandths) | 2.80% | 2.50% | 2.00%
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (in thousandths) | (1.10%) | (1.20%) | (0.80%)
Other, net (in thousandths) | 0.60% | 1.70% | 0.30%
Total (in thousandths) | 22.60% | 22.80% | 20.60%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance as of January 1 | $ 22,902 | $ 20,465 | $ 18,869
Additions for tax for current year positions | 3,961 | 6,384 | 5,649
Settlements during the period | (1,754) | 0 | 0
Lapses of applicable statute of limitations | (4,017) | (3,947) | (4,053)
Balance as of December 31 | 21,092 | 22,902 | 20,465
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 16,400 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 2,300 | 2,400 | $ 2,200
Unrecognized Tax Benefits, Penalties and Interest Accrued | $ 6,400 | $ 5,900 |
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, Federal | 3 |  |
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Minimum | 3 |  |
Unrecognized Tax Benefits, Number of Reporting Periods Open for Examination, State, Maximum | 6 |  |

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