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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,140,086 | $ 1,363,902
Gross Unrealized Gains | 7,540 | 898
Gross Unrealized Losses | 5,174 | 32,142
Fair Value | 1,142,452 | 1,332,658
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,356 | 289
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,356 | 289
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 314,740 | 493,371
Gross Unrealized Gains | 2,039 | 80
Gross Unrealized Losses | 63 | 7,553
Fair Value | 316,716 | 485,898
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 84,744 | 86,260
Gross Unrealized Gains | 1,152 | 113
Gross Unrealized Losses | 60 | 933
Fair Value | 85,836 | 85,440
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 176,737 | 131,831
Gross Unrealized Gains | 1,429 | 168
Gross Unrealized Losses | 1,319 | 3,732
Fair Value | 176,847 | 128,267
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 560,009 | 649,620
Gross Unrealized Gains | 2,920 | 537
Gross Unrealized Losses | 3,664 | 19,599
Fair Value | 559,265 | 630,558
Non-U.S. Government agencies or sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 31
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 31
U.S. corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,500 | 2,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 68 | 325
Fair Value | $ 2,432 | $ 2,175

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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=118939692&loc=d3e27161-111563 + Details
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