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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 60,786 | $ 65,679
Gross Unrealized Gains | 837 | 16
Gross Unrealized Losses | 0 | (1,761)
Fair Value | 61,623 | 63,934
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,217,638 | 733,279
Gross Unrealized Gains | 30,955 | 1,487
Gross Unrealized Losses | (1,260) | (13,397)
Fair Value | 1,247,333 | 721,369
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,949 | 99,926
Gross Unrealized Gains | 84 | 0
Gross Unrealized Losses | 0 | (1,428)
Fair Value | 10,033 | 98,498
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 12,468 | 12,506
Gross Unrealized Gains | 167 | 16
Gross Unrealized Losses | 0 | (114)
Fair Value | 12,635 | 12,408
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 164,263 | 26,566
Gross Unrealized Gains | 6,298 | 327
Gross Unrealized Losses | (248) | (83)
Fair Value | 170,313 | 26,810
Agency mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 48,318 | 53,173
Gross Unrealized Gains | 670 | 0
Gross Unrealized Losses | 0 | (1,647)
Fair Value | 48,988 | 51,526
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 917,102 | 596,825
Gross Unrealized Gains | 18,021 | 1,160
Gross Unrealized Losses | (1,012) | (11,849)
Fair Value | 934,111 | 586,136
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,969 | 9,962
Gross Unrealized Gains | 278 | 0
Gross Unrealized Losses | 0 | (37)
Fair Value | 10,247 | $ 9,925
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 116,355 |
Gross Unrealized Gains | 6,274 |
Gross Unrealized Losses | 0 |
Fair Value | $ 122,629 |

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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