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Investments, Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities [Abstract] |  |
Amortized cost | $ 243,842 | $ 242,242
Gross unrealized gains | 3,446 | 752
Gross unrealized losses | (261) | (1,984)
Fair value | 247,027 | 241,010
U.S. Agency Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 86,514 | 106,516
Gross unrealized gains | 1,622 | 509
Gross unrealized losses | (97) | (640)
Fair value | 88,039 | 106,385
U.S. Treasury Securities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 32,347 | 33,813
Gross unrealized gains | 266 | 0
Gross unrealized losses | (1) | (455)
Fair value | 32,612 | 33,358
Obligations of State and Political Subdivisions [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 60,149 | 52,074
Gross unrealized gains | 984 | 150
Gross unrealized losses | (17) | (177)
Fair value | 61,116 | 52,047
Corporate Obligations [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 3,000 | 3,000
Gross unrealized gains | 76 | 34
Gross unrealized losses | 0 | 0
Fair value | 3,076 | 3,034
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Debt Securities [Abstract] |  |
Amortized cost | 61,832 | 46,839
Gross unrealized gains | 498 | 59
Gross unrealized losses | (146) | (712)
Fair value | $ 62,184 | $ 46,186

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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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