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Investments - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 600,832 | $ 592,378
Gross Unrealized Gains | 19,569 | 9,956
Gross Unrealized Losses | (247) | (1,535)
Estimated Fair Value | 620,154 | 600,799
U.S. Government Agencies [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 11,587 | 12,125
Gross Unrealized Gains | 204 | 124
Gross Unrealized Losses | (49) | (104)
Estimated Fair Value | 11,742 | 12,145
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 393,680 | 398,353
Gross Unrealized Gains | 11,742 | 3,354
Gross Unrealized Losses | (176) | (1,318)
Estimated Fair Value | 405,246 | 400,389
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 195,565 | 181,900
Gross Unrealized Gains | 7,623 | 6,478
Gross Unrealized Losses | (22) | (113)
Estimated Fair Value | $ 203,166 | $ 188,265

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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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