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Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,442,724 | $ 1,390,255
Gross Unrealized Gains | 6,233 | 9,546
Gross Unrealized Losses | 19,419 | 14,117
Fair Value | 1,429,538 | 1,385,684
Obligations of U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 527,057 | 551,176
Gross Unrealized Gains | 2,873 | 3,512
Gross Unrealized Losses | 2,303 | 1,795
Fair Value | 527,627 | 552,893
Obligations of U.S. states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 89,910 | 83,981
Gross Unrealized Gains | 286 | 898
Gross Unrealized Losses | 1,140 | 153
Fair Value | 89,056 | 84,726
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 159,417 | 94,459
Gross Unrealized Gains | 1,081 | 1,535
Gross Unrealized Losses | 2,272 | 1,316
Fair Value | 158,226 | 94,678
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 662,724 | 656,947
Gross Unrealized Gains | 1,993 | 3,599
Gross Unrealized Losses | 13,287 | 10,449
Fair Value | 651,430 | 650,097
Non-U.S. Government agencies or sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 116 | 192
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 0 | 0
Fair Value | 116 | 194
U.S. corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,500 | 2,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 338 | 338
Fair Value | 2,162 | 2,162
Total debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,441,724 | 1,389,255
Gross Unrealized Gains | 6,233 | 9,546
Gross Unrealized Losses | 19,340 | 14,051
Fair Value | 1,428,617 | 1,384,750
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 79 | 66
Fair Value | $ 921 | $ 934

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