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Income Taxes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | $ 41,700,000 |  |
Deferred tax assets, state net operating loss carryforward |  |  | $ 19,500,000 |
Tax Credit Carryforward, Valuation Allowance |  | 0 |  |
Income Tax Examination, Penalties and Interest Expense |  | 467,000 | (135,000) | $ 114,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 896,000 | 429,000 |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Beginning balance of unrecognized tax benefits |  | 32,226,000 | 28,255,000 | 29,004,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | 153,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  | (683,000) | (1,054,000)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions |  | 1,295,000 | 6,554,000 | 1,433,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | (1,516,000) | 0 | 0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 783,000 | 1,900,000 | 1,128,000
Ending balance of unrecognized tax benefits |  | 31,375,000 | 32,226,000 | 28,255,000
Current tax expense |  |  |  |
Federal |  | 137,162,000 | 68,984,000 | 95,151,000
State |  | 14,532,000 | 11,095,000 | 21,523,000
Total current tax expense |  | 151,694,000 | 80,079,000 | 116,674,000
Deferred Income Tax Expense (Benefit) |  |  |  |
Federal |  | (28,535,000) | 50,522,000 | (10,944,000)
State |  | 3,000,000 | 4,076,000 | (2,433,000)
Total deferred tax expense |  | (25,535,000) | 54,598,000 | (13,377,000)
Total income tax expense | $ 13,900,000 | $ 126,159,000 | 134,677,000 | 103,297,000
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Federal statutory rate |  | 21.00% |  |
Income taxes at federal statutory rates |  | $ 129,755,000 | 124,330,000 | 105,758,000
Nontaxable income on loans, leases and investments, net of nondeductible expenses |  | (1,581,000) | (1,639,000) | (1,796,000)
Excess tax benefits of compensation |  | 1,146,000 | 1,070,000 | 371,000
State and local income taxes, including any change in valuation allowance, net of federal income tax benefit |  | 13,850,000 | 11,985,000 | 15,081,000
Effect of federal rate change |  | 0 | 0 | (15,736,000)
Tax credits net of amortization |  | (5,367,000) | (4,474,000) | (2,891,000)
Repayment of claim of right income |  | (13,926,000) | 0 | 0
Other, net |  | 2,282,000 | 3,405,000 | 2,510,000
Total income tax expense | $ 13,900,000 | 126,159,000 | 134,677,000 | $ 103,297,000
Deferred Tax Assets, Net [Abstract] |  |  |  |
Allowance for loan and lease losses |  | 52,293,000 | 53,073,000 |
Operating lease liabilities |  | 15,737,000 | 17,752,000 |
Executive separation from service agreements |  | 8,989,000 | 12,334,000 |
Federal net operating loss carryforward |  | 9,545,000 | 11,085,000 |
Employee compensation |  | 16,083,000 | 13,313,000 |
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences |  | 0 | 8,678,000 |
Deferred Tax Assets, Other reserves |  | 5,376,000 | 5,001,000 |
Other |  | 6,898,000 | 10,698,000 |
Deferred tax asset |  | 114,921,000 | 131,934,000 |
Deferred Tax Liabilities, accelerated depreciation |  | 14,984,000 | 51,249,000 |
Lease financing activities |  | 15,265,000 | 8,101,000 |
Operating lease assets |  | 15,670,000 | 17,837,000 |
Net unrealized gain on securities included in accumulated other comprehensive loss |  | 24,857,000 | 1,821,000 |
Net deferred loan fees and costs |  | 13,975,000 | 11,781,000 |
Intangible assets |  | 13,012,000 | 9,148,000 |
Deferred Tax Liability, Security, loan and debt valuations |  | 2,051,000 | 5,767,000 |
FDIC-assisted transactions timing differences |  | 2,393,000 | 0 |
Pension liability |  | 44,549,000 | 5,079,000 |
Other |  | 10,193,000 | 15,993,000 |
Deferred Tax Liabilities, Gross |  | 156,949,000 | 126,776,000 |
Net deferred tax (liability) asset |  | $ 42,028,000 |  |
Net deferred tax (liability) asset |  |  | $ 5,158,000 |

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