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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 327,224 | $ 323,809 | $ 308,700
Unrealized Gains | 1,414 | 578 | 194
Unrealized Losses | (3,362) | (6,971) | (8,055)
Fair Value (Estimated) | 325,276 | 317,416 | 300,839
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 5,000 | 5,000 |
Unrealized Gains | 16 | 7 |
Unrealized Losses | 0 | 0 |
Fair Value (Estimated) | 5,016 | 5,007 |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 317,269 | 313,854 | 302,935
Unrealized Gains | 1,394 | 571 | 191
Unrealized Losses | (3,240) | (6,732) | (7,798)
Fair Value (Estimated) | 315,423 | 307,693 | 295,328
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 4,955 | 4,955 | 5,765
Unrealized Gains | 4 | 0 | 3
Unrealized Losses | (122) | (239) | (257)
Fair Value (Estimated) | $ 4,837 | $ 4,716 | $ 5,511

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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=82897076&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=82897076&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=82897076&loc=d3e27161-111563 + Details
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