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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Taxes [Abstract] |  |
Allowance for loan losses | $ 89,120 | $ 72,940
Employee compensation and benefits | 28,401 | 26,853
Loan purchase accounting adjustments | 12,047 | 18,977
Tax credit carryforward | 29,085 | 42,850
Securities | 23,169 | 5,038
State net operating loss | 1,690 | 1,910
Other | 14,583 | 10,928
Gross deferred tax assets | 198,095 | 179,496
State valuation allowance | (1,690) | (1,910)
Subtotal valuation allowance | (1,690) | (1,910)
Net deferred tax assets | 196,405 | 177,586
Fixed assets & intangibles | (74,518) | (80,389)
FDIC indemnification asset | (6,293) | (10,688)
Other | (11,159) | (10,679)
Gross deferred tax liabilities | (91,970) | (101,756)
Net deferred tax asset | $ 104,435 | $ 75,830

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