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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 28,600 | $ 28,600 |  |
Deferred tax assets, state net operating loss carryforward | 15,400 | 15,400 |  |
Increase in tax expense attributable to revaluation of deferred tax assets | 25,800 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 564 | $ 450 | $ 357
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Beginning balance of unrecognized tax benefits |  | 29,004 | 28,879 | 5,975
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | (1,054) | (44) | (327)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions |  | 1,433 | 169 | 23,231
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | (1,128) | 0 | 0
Ending balance of unrecognized tax benefits | 28,255 | 28,255 | 29,004 | 28,879
Current tax expense |  |  |  |
Federal |  | 95,151 | 87,992 | 84,946
State |  | 21,523 | 6,116 | 7,493
Total current tax expense |  | 116,674 | 94,108 | 92,439
Deferred Income Tax Expense (Benefit) |  |  |  |
Federal |  | (10,944) | 115,392 | 23,144
State |  | (2,433) | 10,446 | 10,002
Total deferred tax expense |  | (13,377) | 125,838 | 33,146
Total income tax expense |  | $ 103,297 | 219,946 | 125,585
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Federal statutory rate |  | 21.00% |  |
Income taxes at federal statutory rates |  | $ 105,758 | 190,294 | 122,874
Nontaxable income on loans, leases and investments, net of nondeductible expenses |  | (1,796) | (2,525) | (2,901)
Nondeductible FDIC insurance expense |  | 2,348 | 0 | 0
State and local income taxes, including change in valuation allowance, net of federal income tax benefit |  | 15,081 | 10,765 | 11,372
Effect of federal rate change |  | (15,736) |  | 0
Tax credits net of amortization |  | (2,891) | (4,840) | (4,138)
Other, net |  | 533 | 490 | (1,622)
Total income tax expense |  | 103,297 | 219,946 | $ 125,585
Deferred Tax Assets, Net [Abstract] |  |  |  |
Allowance for loan and lease losses | 53,391 | 53,391 | 50,853 |
Pension liability | 0 | 0 | 704 |
Executive separation from service agreements | 7,927 | 7,927 | 8,548 |
Federal net operating loss carryforward | 6,862 | 6,862 | 2,685 |
Net unrealized loss included in comprehensive income | 32,663 | 32,663 | 10,849 |
Employee compensation | 11,145 | 11,145 | 4,192 |
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences | 7,622 | 7,622 | 0 |
Deferred Tax Assets, Other reserves | 5,574 | 5,574 | 5,570 |
Other | 9,555 | 9,555 | 5,924 |
Deferred tax asset | 134,739 | 134,739 | 89,325 |
Deferred Tax Liabilities, accelerated depreciation | 4,987 | 4,987 | 7,562 |
Lease financing activities | 12,674 | 12,674 | 9,131 |
Net deferred loan fees and costs | 10,651 | 10,651 | 8,708 |
Intangible assets | 11,713 | 11,713 | 12,252 |
Deferred Tax Liability, Security, loan and debt valuations | 4,557 | 4,557 | 7,018 |
FDIC-assisted transactions timing differences | 0 | 0 | 1,113 |
Pension liability | 6,287 | 6,287 | 0 |
Other | 1,722 | 1,722 | 4,565 |
Deferred tax liability | 52,591 | 52,591 | 50,349 |
Net deferred tax assets | $ 82,148 | $ 82,148 | $ 38,976 |

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