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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 14,300 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 357 | $ 298 | $ 1,127
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance of unrecognized tax benefits | 5,975 | 3,865 | 2,823
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (327) | (79) | 0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 23,231 | 2,189 | 1,042
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | 0 | 0
Ending balance of unrecognized tax benefits | 28,879 | 5,975 | 3,865
Current tax expense |  |  |
Federal | 84,946 | 105,367 | 84,430
State | 7,493 | 16,111 | 13,941
Total current tax expense | 92,439 | 121,478 | 98,371
Deferred Income Tax Expense (Benefit) |  |  |
Federal | 23,144 | (2,758) | (30,658)
State | 10,002 | 3,308 | (2,681)
Total deferred tax expense (benefit) | 33,146 | 550 | (33,339)
Total income tax expense | $ 125,585 | 122,028 | 65,032
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal statutory rate | 35.00% |  |
Income taxes at statutory rates | $ 122,874 | 116,345 | 71,258
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (2,901) | (3,020) | (1,832)
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 11,372 | 12,622 | 7,319
Effective Income Tax Rate Reconciliation, Acquisition Stock Settlement, Amount | (98) | 0 | (10,185)
Tax credits | (4,138) | (3,060) | (2,896)
Other, net | (1,524) | (859) | 1,368
Total income tax expense | 125,585 | 122,028 | $ 65,032
Deferred Tax Assets, Net [Abstract] |  |  |
Allowance for loan and lease losses | 80,939 | 78,878 |
Pension liability | 15,679 | 7,206 |
Executive separation from service agreements | 14,278 | 9,856 |
State operating loss carryforwards | 0 | 21 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 5,019 | 0 |
Unrealized loss on cash flow hedge | 0 | 537 |
Net unrealized loss on securities included in accumulated other comprehensive loss | 26,832 | 9,379 |
Deferred Tax Assets, Property, Plant and Equipment | 133 | 13,195 |
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences, Amount | 52,579 | 66,456 |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves | 10,504 | 10,772 |
Other | 26,663 | 29,279 |
Gross deferred tax asset | 232,626 | 225,579 |
Lease financing activities | 11,651 | 15,492 |
Net deferred loan fees and costs | 10,867 | 6,051 |
Intangible assets | 6,335 | 2,040 |
Deferred Tax Liability, Mark to Market Section 475, Amount | 22,656 | 31,486 |
Other | 8,501 | 12,026 |
Deferred tax liability | 60,010 | 67,095 |
Net deferred tax assets | $ 172,616 | $ 158,484 |

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