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Securities - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total | $ 1,407,465 | $ 1,408,996
Gross Unrealized Gains | 996 |
Gross Unrealized Losses | 37,692 |
Fair Value | 1,370,769 | 1,391,862
Amortized Cost | 1,408,360 | 1,409,996
Gross Unrealized Gains | 996 | 2,263
Gross Unrealized Losses | 37,692 | 19,484
Fair Value | 1,371,664 | 1,392,775
Obligations of U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 498,644 |
Gross Unrealized Gains | 7 |
Gross Unrealized Losses | 8,804 |
Fair Value | 489,847 |
Amortized Cost |  | 507,248
Gross Unrealized Gains |  | 278
Gross Unrealized Losses |  | 3,333
Fair Value |  | 504,193
Obligations of U.S. states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 91,623 |
Gross Unrealized Gains | 106 |
Gross Unrealized Losses | 1,381 |
Fair Value | 90,348 |
Amortized Cost |  | 91,659
Gross Unrealized Gains |  | 281
Gross Unrealized Losses |  | 421
Fair Value |  | 91,519
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 133,524 |
Gross Unrealized Gains | 461 |
Gross Unrealized Losses | 4,305 |
Fair Value | 129,680 |
Amortized Cost |  | 139,747
Gross Unrealized Gains |  | 659
Gross Unrealized Losses |  | 2,671
Fair Value |  | 137,735
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 681,110 |
Gross Unrealized Gains | 422 |
Gross Unrealized Losses | 22,877 |
Fair Value | 658,655 |
Amortized Cost |  | 667,767
Gross Unrealized Gains |  | 1,045
Gross Unrealized Losses |  | 12,634
Fair Value |  | 656,178
Non-U.S. Government agencies or sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 64 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 64 |
Amortized Cost |  | 75
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 75
U.S. corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 2,500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 325 |
Fair Value | 2,175 |
Amortized Cost |  | 2,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 338
Fair Value |  | 2,162
Total debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 592,767 | 601,407
Fair Value | 582,370 | 597,874
Amortized Cost |  | 1,408,996
Gross Unrealized Gains |  | 2,263
Gross Unrealized Losses |  | 19,397
Fair Value |  | 1,391,862
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 895 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 87
Fair Value | $ 895 | $ 913

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