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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,360,508 | $ 1,408,996
Gross Unrealized Gains | 381 |
Gross Unrealized Losses | 50,217 |
Fair Value | 1,310,672 | 1,391,863
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 498,837 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 13,104 |
Fair Value | 485,733 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 86,517 |
Gross Unrealized Gains | 33 |
Gross Unrealized Losses | 1,788 |
Fair Value | 84,762 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 114,417 |
Gross Unrealized Gains | 143 |
Gross Unrealized Losses | 5,404 |
Fair Value | 109,156 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 658,195 |
Gross Unrealized Gains | 205 |
Gross Unrealized Losses | 29,596 |
Fair Value | 628,804 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 42 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 42 |
Amortized Cost |  | 75
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Available-for-sale securities, at fair value |  | 75
U.S. corporate debt securities |  |
Debt Securities, Available-for-sale [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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 587,854 | 601,407
Fair Value | $ 572,670 | 597,875
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 |  |
Debt Securities, Available-for-sale [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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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