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Income Taxes (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | $ 12,800 | $ 12,800 | $ 12,800 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  | 450 |  | $ 357 | $ 298
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Beginning balance of unrecognized tax benefits |  |  | 28,879 |  | 5,975 | 3,865
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  | 0 |  | (327) | (79)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions |  |  | 125 |  | 23,231 | 2,189
Ending balance of unrecognized tax benefits |  |  | 29,004 |  | 28,879 | 5,975
Current tax expense |  |  |  |  |  |
Federal |  |  | 87,992 |  | 84,946 | 105,367
State |  |  | 6,116 |  | 7,493 | 16,111
Total current tax expense |  |  | 94,108 |  | 92,439 | 121,478
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |
Federal |  |  | 115,392 |  | 23,144 | (2,758)
State |  |  | 10,446 |  | 10,002 | 3,308
Total deferred tax expense |  |  | 125,838 |  | 33,146 | 550
Total income tax expense |  |  | 219,946 |  | 125,585 | 122,028
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |
Federal statutory rate | 21.00% | 35.00% |  | 35.00% |  |
Income taxes at federal statutory rates |  |  | 190,294 |  | 122,874 | 116,345
Nontaxable income on loans, leases and investments, net of nondeductible expenses |  |  | (2,525) |  | (2,901) | (3,020)
State and local income taxes, including change in valuation allowance, net of federal income tax benefit |  |  | 10,765 |  | 11,372 | 12,622
Effect of federal rate change |  |  | 25,762 |  | 0 | 0
Acquisition Stock Settlement |  |  | 0 |  | (98) | 0
Tax credits net of amortization |  |  | (4,840) |  | (4,138) | (3,060)
Other, net |  |  | 490 |  | (1,524) | (859)
Total income tax expense |  |  | 219,946 |  | 125,585 | $ 122,028
Deferred Tax Assets, Net [Abstract] |  |  |  |  |  |
Allowance for loan and lease losses |  | $ 50,853 | 50,853 | $ 50,853 | 80,939 |
Pension liability |  | 704 | 704 | 704 | 15,679 |
Executive separation from service agreements |  | 8,548 | 8,548 | 8,548 | 14,278 |
Federal net operating loss carryforward |  | 2,685 | 2,685 | 2,685 | 5,019 |
Net unrealized loss on securities included in accumulated other comprehensive loss |  | 10,849 | 10,849 | 10,849 | 26,832 |
Deferred Tax Assets, accelerated depreciation |  | 0 | 0 | 0 | 133 |
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences |  | 0 | 0 | 0 | 52,579 |
Deferred Tax Assets, Other reserves |  | 5,570 | 5,570 | 5,570 | 10,504 |
Other |  | 10,116 | 10,116 | 10,116 | 26,663 |
Deferred tax asset |  | 89,325 | 89,325 | 89,325 | 232,626 |
Deferred Tax Liabilities, accelerated depreciation |  | 7,562 | 7,562 | 7,562 | 0 |
Lease financing activities |  | 9,131 | 9,131 | 9,131 | 11,651 |
Net deferred loan fees and costs |  | 8,708 | 8,708 | 8,708 | 10,867 |
Intangible assets |  | 12,252 | 12,252 | 12,252 | 6,335 |
Deferred Tax Liability, Security, loan and debt valuations |  | 7,018 | 7,018 | 7,018 | 22,656 |
FDIC-assisted transactions timing differences |  | 1,113 | 1,113 | 1,113 | 0 |
Other |  | 4,565 | 4,565 | 4,565 | 8,501 |
Deferred tax liability |  | 50,349 | 50,349 | 50,349 | 60,010 |
Net deferred tax assets |  | $ 38,976 | $ 38,976 | $ 38,976 | $ 172,616 |

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