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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 331,962 | $ 281,606 | $ 298,786
Unrealized Gains | 10,288 | 5,590 | 7,925
Unrealized Losses | (188) | (151) | (64)
Fair Value (Estimated) | 342,062 | 287,045 | 306,647
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 26,146 | 32,840 | 32,840
Unrealized Gains | 294 | 47 | 93
Unrealized Losses | 0 | (26) | 0
Fair Value (Estimated) | 26,440 | 32,861 | 32,933
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 43,414 | 14,431 | 15,584
Unrealized Gains | 844 | 450 | 502
Unrealized Losses | (119) | (16) | (16)
Fair Value (Estimated) | 44,139 | 14,865 | 16,070
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 245,152 | 219,585 | 236,612
Unrealized Gains | 8,660 | 4,936 | 7,136
Unrealized Losses | (69) | (109) | (48)
Fair Value (Estimated) | 253,743 | 224,412 | 243,700
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 17,250 | 14,750 | 13,750
Unrealized Gains | 490 | 157 | 194
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 17,740 | $ 14,907 | $ 13,944

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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=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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