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Federal and State Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred tax assets [Abstract] |  |  |
Available for sale securities mark to market | $ 183,724 | $ 255,244 |
Credit loss reserves | 76,361 | 69,385 |
Lease liability | 61,204 | 49,839 |
Deferred compensation | 41,350 | 34,645 |
Unearned fees | 12,682 | 12,915 |
Purchased loan discount | 3,546 | 4,955 |
Share-based compensation | 6,068 | 4,625 |
Valuation adjustments | 4,860 | 5,792 |
Other | 47,169 | 42,808 |
Total deferred tax assets | 436,964 | 480,208 |
Valuation Allowance [Abstract] |  |  |
Valuation allowance | 0 | 0 |
Deferred tax liabilities [Abstract] |  |  |
Right-of-use asset | 51,943 | 40,741 |
Mortgage servicing rights | 47,646 | 49,001 |
Acquired identifiable intangible | 8,166 | 11,280 |
Depreciation | 4,578 | 7,163 |
Lease financing | 12,148 | 12,333 |
Other | 42,887 | 38,357 |
Total deferred tax liabilities | 167,368 | 158,875 |
Net deferred tax assets, net | 269,596 | 321,333 |
Current income tax expense [Abstract] |  |  |
Federal | 152,600 | 127,144 | $ 121,196
State | 19,298 | 18,185 | 21,065
Total current income tax expense | 171,898 | 145,329 | 142,261
Deferred income tax expense [Abstract] |  |  |
Federal | (17,973) | (4,700) | 29,777
State | (1,810) | (765) | 7,737
Total deferred income tax expense (benefit) | (19,783) | (5,465) | 37,514
Total income tax expense | 152,115 | 139,864 | 179,775
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal statutory tax | 143,482 | 138,633 | 167,181
Tax exempt revenue | (5,786) | (5,714) | (6,084)
Effect of state income taxes, net of federal benefit | 13,330 | 13,490 | 22,489
Utilization of tax credits, net of proportional amortization of low-income housing, new market, and historical tax credits | (2,673) | (8,883) | (8,801)
Other, net | 3,762 | 2,338 | 4,990
Total income tax expense | $ 152,115 | $ 139,864 | $ 179,775
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal statutory tax (in thousandths) | 21.00% | 21.00% | 21.00%
Tax exempt revenue (in thousandths) | (0.80%) | (0.80%) | (0.70%)
Effect of state income taxes, net of federal benefit (in thousandths) | 2.00% | 2.00% | 2.80%
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (in thousandths) | (0.40%) | (1.40%) | (1.10%)
Other, net (in thousandths) | 0.50% | 0.40% | 0.60%
Total (in thousandths) | 22.30% | 21.20% | 22.60%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance as of January 1 | $ 19,583 | $ 21,092 | $ 22,902
Additions for tax for current year positions | 3,239 | 3,465 | 3,961
Settlements during the period | 0 | 0 | (1,754)
Lapses of applicable statute of limitations | (4,865) | (4,974) | (4,017)
Balance as of December 31 | 17,957 | 19,583 | 21,092
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 14,100 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 1,600 | 1,800 | $ 2,300
Unrecognized Tax Benefits, Penalties and Interest Accrued | $ 5,700 | $ 6,000 |
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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