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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,363,902 | $ 1,408,996
Gross Unrealized Gains | 898 |
Gross Unrealized Losses | 32,142 |
Available-for-sale securities, at fair value | 1,332,658 | 1,391,862
Amortized Cost |  | 1,409,996
Gross Unrealized Gains |  | 2,263
Gross Unrealized Losses |  | 19,484
Fair Value |  | 1,392,775
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 289 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Available-for-sale securities, at fair value | 289 |
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 493,371 |
Gross Unrealized Gains | 80 |
Gross Unrealized Losses | 7,553 |
Available-for-sale securities, at fair value | 485,898 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 86,260 |
Gross Unrealized Gains | 113 |
Gross Unrealized Losses | 933 |
Available-for-sale securities, at fair value | 85,440 |
Amortized Cost |  | 91,659
Gross Unrealized Gains |  | 281
Gross Unrealized Losses |  | 421
Fair Value |  | 91,519
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 131,831 |
Gross Unrealized Gains | 168 |
Gross Unrealized Losses | 3,732 |
Available-for-sale securities, at fair value | 128,267 |
Amortized Cost |  | 139,747
Gross Unrealized Gains |  | 659
Gross Unrealized Losses |  | 2,671
Fair Value |  | 137,735
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 649,620 |
Gross Unrealized Gains | 537 |
Gross Unrealized Losses | 19,599 |
Available-for-sale securities, at fair value | 630,558 |
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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Available-for-sale securities, at fair value | 31 |
Amortized Cost |  | 75
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
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 |
Available-for-sale securities, at fair value | 2,175 |
Amortized Cost |  | 2,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 338
Fair Value |  | 2,162
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 582,420 | 601,407
Available-for-sale securities, at fair value | $ 573,802 | 597,874
Amortized Cost |  | 1,408,996
Gross Unrealized Gains |  | 2,263
Gross Unrealized Losses |  | 19,397
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
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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