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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,385,805 | $ 1,408,996
Gross Unrealized Gains | 640 |
Gross Unrealized Losses | 42,755 |
Fair Value | 1,343,690 | 1,391,862
Amortized Cost |  | 1,409,996
Gross Unrealized Gains |  | 2,263
Gross Unrealized Losses |  | 19,484
Available-for-sale securities, at fair value |  | 1,392,775
Obligations of U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 498,540 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 10,941 |
Fair Value | 487,599 |
Amortized Cost |  | 507,248
Gross Unrealized Gains |  | 278
Gross Unrealized Losses |  | 3,333
Available-for-sale securities, at fair value |  | 504,193
Obligations of U.S. states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 87,510 |
Gross Unrealized Gains | 74 |
Gross Unrealized Losses | 1,374 |
Fair Value | 86,210 |
Amortized Cost |  | 91,659
Gross Unrealized Gains |  | 281
Gross Unrealized Losses |  | 421
Available-for-sale securities, at fair value |  | 91,519
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 124,343 |
Gross Unrealized Gains | 261 |
Gross Unrealized Losses | 4,728 |
Fair Value | 119,876 |
Amortized Cost |  | 139,747
Gross Unrealized Gains |  | 659
Gross Unrealized Losses |  | 2,671
Available-for-sale securities, at fair value |  | 137,735
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 672,859 |
Gross Unrealized Gains | 305 |
Gross Unrealized Losses | 25,387 |
Fair Value | 647,777 |
Amortized Cost |  | 667,767
Gross Unrealized Gains |  | 1,045
Gross Unrealized Losses |  | 12,634
Available-for-sale securities, at fair value |  | 656,178
Non-U.S. Government agencies or sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 53 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 53 |
Amortized Cost |  | 75
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Available-for-sale securities, at fair value |  | 75
U.S. corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 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
Available-for-sale securities, at fair value |  | 2,162
Total available-for-sale securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 588,550 | 601,407
Fair Value | $ 575,984 | 597,874
Amortized Cost |  | 1,408,996
Gross Unrealized Gains |  | 2,263
Gross Unrealized Losses |  | 19,397
Available-for-sale securities, at fair value |  | 1,391,862
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 87
Available-for-sale securities, at fair value |  | $ 913

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