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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 302,941 | $ 355,890 | $ 327,224
Unrealized Gains | 10,176 | 5,565 | 1,414
Unrealized Losses | (189) | (935) | (3,362)
Fair Value (Estimated) | 312,928 | 360,520 | 325,276
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 7,500 | 7,500 | 5,000
Unrealized Gains | 52 | 0 | 16
Unrealized Losses | 0 | (102) | 0
Fair Value (Estimated) | 7,552 | 7,398 | 5,016
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 276,235 | 323,277 | 317,269
Unrealized Gains | 9,106 | 4,173 | 1,394
Unrealized Losses | (189) | (833) | (3,240)
Fair Value (Estimated) | 285,152 | 326,617 | 315,423
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 19,206 | 25,113 | 4,955
Unrealized Gains | 1,018 | 1,392 | 4
Unrealized Losses | 0 | 0 | (122)
Fair Value (Estimated) | $ 20,224 | $ 26,505 | $ 4,837

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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