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Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Security | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | $ 244,302 |  | $ 244,302 |  |
Gross unrealized gains | 118 |  | 118 |  |
Gross unrealized losses | (3,994) |  | (3,994) |  |
Fair value | $ 240,426 |  | $ 240,426 |  | $ 254,782
Equity Securities [Abstract] |  |  |  |  |
Amortized cost |  |  |  |  | 92
Gross unrealized gains |  |  |  |  | 0
Gross unrealized losses |  |  |  |  | (1)
Fair value |  |  |  |  | 91
Total Available-for-sale Securities [Abstract] |  |  |  |  |
Amortized cost |  |  |  |  | 255,122
Gross unrealized gains |  |  |  |  | 948
Gross unrealized losses |  |  |  |  | (1,288)
Fair value |  |  |  |  | 254,782
Number of securities owned with fair value less than cost | Security | 143 |  | 143 |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | $ 131,051 |  | $ 131,051 |  |
Twelve months or greater, Fair value | 72,991 |  | 72,991 |  |
Total, Fair value | 204,042 |  | 204,042 |  |
Less than twelve months, Gross unrealized losses | (2,165) |  | (2,165) |  |
Twelve months or greater, Gross unrealized losses | (1,829) |  | (1,829) |  |
Total, Gross Unrealized Losses | (3,994) |  | (3,994) |  |
Available-for-sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value |  |  |  |  | 145,686
Twelve months or greater, Fair value |  |  |  |  | 36,708
Total, Fair value |  |  |  |  | 182,394
Less than twelve months, Gross unrealized losses |  |  |  |  | (875)
Twelve months or greater, Gross unrealized losses |  |  |  |  | (413)
Total, Gross Unrealized Losses |  |  |  |  | (1,288)
Proceeds from sale of securities available-for-sale | 25,168 | $ 0 | 25,168 | $ 30,393 |
Realized investment gains (losses) [Abstract] |  |  |  |  |
Gross gains on available for sale securities | 161 | 9 | 161 | 211 |
Gross losses on available for sale securities | (169) | 0 | (169) | (7) |
Net gains | (8) | 9 | (8) | 204 |
Equity Securities Fv Ni Gain (Loss) [Abstract] |  |  |  |  |
Net gains (losses) recognized in equity securities during the period | (4) | $ 0 | 9 | $ 0 |
Less: Net gains realized on the sale of equity securities during the period | 0 |  | 0 |  |
Net unrealized gains (losses) | (4) |  | 9 |  |
Investment securities pledged as collateral | 237,000 |  | 237,000 |  | 243,400
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Due in one year or less | 29,087 |  | 29,087 |  |
Due after one year through five years | 105,536 |  | 105,536 |  |
Due after five years through ten years | 59,609 |  | 59,609 |  |
Due after ten years | 50,070 |  | 50,070 |  |
Amortized cost | 244,302 |  | 244,302 |  |
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Due in one year or less | 29,035 |  | 29,035 |  |
Due after one year through five years | 103,350 |  | 103,350 |  |
Due after five years through ten years | 58,574 |  | 58,574 |  |
Due after ten years | 49,467 |  | 49,467 |  |
Fair value | 240,426 |  | 240,426 |  | 254,782
U.S. Agency Securities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 109,612 |  | 109,612 |  | 99,454
Gross unrealized gains | 0 |  | 0 |  | 26
Gross unrealized losses | (1,343) |  | (1,343) |  | (593)
Fair value | 108,269 |  | 108,269 |  | 98,887
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 54,399 |  | 54,399 |  | 74,952
Twelve months or greater, Fair value | 40,554 |  | 40,554 |  | 16,928
Total, Fair value | 94,953 |  | 94,953 |  | 91,880
Less than twelve months, Gross unrealized losses | (656) |  | (656) |  | (421)
Twelve months or greater, Gross unrealized losses | (687) |  | (687) |  | (172)
Total, Gross Unrealized Losses | (1,343) |  | (1,343) |  | (593)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 109,612 |  | 109,612 |  | 99,454
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 108,269 |  | 108,269 |  | 98,887
U.S. Treasury Securities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 33,798 |  | 33,798 |  | 28,782
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (961) |  | (961) |  | (178)
Fair value | 32,837 |  | 32,837 |  | 28,604
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 32,837 |  | 32,837 |  | 28,604
Twelve months or greater, Fair value | 0 |  | 0 |  | 0
Total, Fair value | 32,837 |  | 32,837 |  | 28,604
Less than twelve months, Gross unrealized losses | (961) |  | (961) |  | (178)
Twelve months or greater, Gross unrealized losses | 0 |  | 0 |  | 0
Total, Gross Unrealized Losses | (961) |  | (961) |  | (178)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 33,798 |  | 33,798 |  | 28,782
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 32,837 |  | 32,837 |  | 28,604
Obligations of State and Political Subdivisions [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 51,941 |  | 51,941 |  | 78,409
Gross unrealized gains | 116 |  | 116 |  | 820
Gross unrealized losses | (459) |  | (459) |  | (139)
Fair value | 51,598 |  | 51,598 |  | 79,090
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 26,648 |  | 26,648 |  | 14,885
Twelve months or greater, Fair value | 8,381 |  | 8,381 |  | 5,958
Total, Fair value | 35,029 |  | 35,029 |  | 20,843
Less than twelve months, Gross unrealized losses | (249) |  | (249) |  | (85)
Twelve months or greater, Gross unrealized losses | (210) |  | (210) |  | (54)
Total, Gross Unrealized Losses | (459) |  | (459) |  | (139)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 51,941 |  | 51,941 |  | 78,409
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 51,598 |  | 51,598 |  | 79,090
Corporate Obligations [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 3,000 |  | 3,000 |  | 3,000
Gross unrealized gains | 0 |  | 0 |  | 83
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value | 3,000 |  | 3,000 |  | 3,083
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 3,000 |  | 3,000 |  | 3,000
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 3,000 |  | 3,000 |  | 3,083
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 45,951 |  | 45,951 |  | 45,385
Gross unrealized gains | 2 |  | 2 |  | 19
Gross unrealized losses | (1,231) |  | (1,231) |  | (377)
Fair value | 44,722 |  | 44,722 |  | 45,027
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 17,167 |  | 17,167 |  | 27,154
Twelve months or greater, Fair value | 24,056 |  | 24,056 |  | 13,822
Total, Fair value | 41,223 |  | 41,223 |  | 40,976
Less than twelve months, Gross unrealized losses | (299) |  | (299) |  | (190)
Twelve months or greater, Gross unrealized losses | (932) |  | (932) |  | (187)
Total, Gross Unrealized Losses | (1,231) |  | (1,231) |  | (377)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 45,951 |  | 45,951 |  | 45,385
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | $ 44,722 |  | $ 44,722 |  | 45,027
Equity Securities in Financial Institutions [Member] |  |  |  |  |
Available-for-sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value |  |  |  |  | 91
Twelve months or greater, Fair value |  |  |  |  | 0
Total, Fair value |  |  |  |  | 91
Less than twelve months, Gross unrealized losses |  |  |  |  | (1)
Twelve months or greater, Gross unrealized losses |  |  |  |  | 0
Total, Gross Unrealized Losses |  |  |  |  | $ (1)

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