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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 341,592 | $ 281,606 | $ 281,219
Unrealized Gains | 8,008 | 5,590 | 3,582
Unrealized Losses | (352) | (151) | (2,233)
Fair Value (Estimated) | 349,248 | 287,045 | 282,568
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 35,981 | 32,840 | 31,155
Unrealized Gains | 207 | 47 | 48
Unrealized Losses | 0 | (26) | (280)
Fair Value (Estimated) | 36,188 | 32,861 | 30,923
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 51,142 | 14,431 | 17,560
Unrealized Gains | 1,392 | 450 | 372
Unrealized Losses | (7) | (16) | (146)
Fair Value (Estimated) | 52,527 | 14,865 | 17,786
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 239,719 | 219,585 | 225,204
Unrealized Gains | 5,819 | 4,936 | 3,162
Unrealized Losses | (345) | (109) | (1,801)
Fair Value (Estimated) | 245,193 | 224,412 | 226,565
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 14,750 | 14,750 | 7,300
Unrealized Gains | 590 | 157 | 0
Unrealized Losses | 0 | 0 | (6)
Fair Value (Estimated) | $ 15,340 | $ 14,907 | $ 7,294

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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