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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 341,962 | $ 281,606 | $ 302,527
Unrealized Gains | 10,347 | 5,590 | 6,041
Unrealized Losses | (84) | (151) | (493)
Fair Value (Estimated) | 352,225 | 287,045 | 308,075
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 31,144 | 32,840 | 35,995
Unrealized Gains | 177 | 47 | 88
Unrealized Losses | 0 | (26) | 0
Fair Value (Estimated) | 31,321 | 32,861 | 36,083
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 50,983 | 14,431 | 16,569
Unrealized Gains | 1,089 | 450 | 500
Unrealized Losses | (52) | (16) | (33)
Fair Value (Estimated) | 52,020 | 14,865 | 17,036
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 245,085 | 219,585 | 236,213
Unrealized Gains | 8,492 | 4,936 | 5,331
Unrealized Losses | (32) | (109) | (460)
Fair Value (Estimated) | 253,545 | 224,412 | 241,084
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 14,750 | 14,750 | 13,750
Unrealized Gains | 589 | 157 | 122
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 15,339 | $ 14,907 | $ 13,872

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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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