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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 281,219 | $ 255,663 | $ 258,690
Unrealized Gains | 3,582 | 1,382 | 1,966
Unrealized Losses | (2,233) | (6,145) | (4,805)
Fair Value (Estimated) | 282,568 | 250,900 | 255,851
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 31,155 | 11,155 | 11,155
Unrealized Gains | 48 | 0 | 0
Unrealized Losses | (280) | (472) | (515)
Fair Value (Estimated) | 30,923 | 10,683 | 10,640
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 17,560 | 18,250 | 21,990
Unrealized Gains | 372 | 336 | 469
Unrealized Losses | (146) | (255) | (289)
Fair Value (Estimated) | 17,786 | 18,331 | 22,170
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 225,204 | 221,958 | 221,245
Unrealized Gains | 3,162 | 1,046 | 1,497
Unrealized Losses | (1,801) | (5,418) | (4,001)
Fair Value (Estimated) | 226,565 | 217,586 | 218,741
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 7,300 | 4,300 | 4,300
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | (6) | 0 | 0
Fair Value (Estimated) | $ 7,294 | $ 4,300 | $ 4,300

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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=82897076&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=82897076&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=82897076&loc=d3e27232-111563 + Details
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