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Investments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | $ 252,938 |  | $ 252,938 |  |
Gross unrealized gains | 512 |  | 512 |  |
Gross unrealized losses | (3,425) |  | (3,425) |  |
Fair value | $ 250,025 |  | $ 250,025 |  | $ 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 | 201 |  | 201 |  |
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | $ 157,633 |  | $ 157,633 |  |
Twelve months or greater, Fair value | 43,526 |  | 43,526 |  |
Total, Fair value | 201,159 |  | 201,159 |  |
Less than twelve months, Gross unrealized losses | (2,388) |  | (2,388) |  |
Twelve months or greater, Gross unrealized losses | (1,037) |  | (1,037) |  |
Total, Gross Unrealized Losses | (3,425) |  | (3,425) |  |
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 | 0 | $ 6,641 | 0 | $ 25,407 |
Realized investment gains (losses) [Abstract] |  |  |  |  |
Gross gains on available for sale securities | 0 | 30 | 0 | 202 |
Gross losses on available for sale securities | 0 | (7) | 0 | (7) |
Net gains | 0 | 23 | 0 | 195 |
Equity Securities Fv Ni Gain (Loss) [Abstract] |  |  |  |  |
Net gains recognized in equity securities during the period | 7 | $ 0 | 13 | $ 0 |
Less: Net gains realized on the sale of equity securities during the period | 0 |  | 0 |  |
Unrealized gains recognized in equity securities held at reporting date | 7 |  | 13 |  |
Investment securities pledged as collateral | 240,800 |  | 240,800 |  | 243,400
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Due in one year or less | 47,012 |  | 47,012 |  |
Due after one year through five years | 106,241 |  | 106,241 |  |
Due after five years through ten years | 50,336 |  | 50,336 |  |
Due after ten years | 49,349 |  | 49,349 |  |
Amortized cost | 252,938 |  | 252,938 |  |
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Due in one year or less | 47,121 |  | 47,121 |  |
Due after one year through five years | 104,395 |  | 104,395 |  |
Due after five years through ten years | 49,644 |  | 49,644 |  |
Due after ten years | 48,865 |  | 48,865 |  |
Fair value | 250,025 |  | 250,025 |  | 254,782
U.S. Agency Securities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 103,190 |  | 103,190 |  | 99,454
Gross unrealized gains | 30 |  | 30 |  | 26
Gross unrealized losses | (1,232) |  | (1,232) |  | (593)
Fair value | 101,988 |  | 101,988 |  | 98,887
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 76,159 |  | 76,159 |  | 74,952
Twelve months or greater, Fair value | 19,842 |  | 19,842 |  | 16,928
Total, Fair value | 96,001 |  | 96,001 |  | 91,880
Less than twelve months, Gross unrealized losses | (978) |  | (978) |  | (421)
Twelve months or greater, Gross unrealized losses | (254) |  | (254) |  | (172)
Total, Gross Unrealized Losses | (1,232) |  | (1,232) |  | (593)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 103,190 |  | 103,190 |  | 99,454
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 101,988 |  | 101,988 |  | 98,887
U.S. Treasury Securities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 33,783 |  | 33,783 |  | 28,782
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (791) |  | (791) |  | (178)
Fair value | 32,992 |  | 32,992 |  | 28,604
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 32,992 |  | 32,992 |  | 28,604
Twelve months or greater, Fair value | 0 |  | 0 |  | 0
Total, Fair value | 32,992 |  | 32,992 |  | 28,604
Less than twelve months, Gross unrealized losses | (791) |  | (791) |  | (178)
Twelve months or greater, Gross unrealized losses | 0 |  | 0 |  | 0
Total, Gross Unrealized Losses | (791) |  | (791) |  | (178)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 33,783 |  | 33,783 |  | 28,782
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 32,992 |  | 32,992 |  | 28,604
Obligations of State and Political Subdivisions [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 67,763 |  | 67,763 |  | 78,409
Gross unrealized gains | 456 |  | 456 |  | 820
Gross unrealized losses | (347) |  | (347) |  | (139)
Fair value | 67,872 |  | 67,872 |  | 79,090
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 22,564 |  | 22,564 |  | 14,885
Twelve months or greater, Fair value | 6,007 |  | 6,007 |  | 5,958
Total, Fair value | 28,571 |  | 28,571 |  | 20,843
Less than twelve months, Gross unrealized losses | (220) |  | (220) |  | (85)
Twelve months or greater, Gross unrealized losses | (127) |  | (127) |  | (54)
Total, Gross Unrealized Losses | (347) |  | (347) |  | (139)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 67,763 |  | 67,763 |  | 78,409
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | 67,872 |  | 67,872 |  | 79,090
Corporate Obligations [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 3,000 |  | 3,000 |  | 3,000
Gross unrealized gains | 23 |  | 23 |  | 83
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value | 3,023 |  | 3,023 |  | 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 | 3,023 |  | 3,023 |  | 3,083
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |  |  |  |
Debt Securities [Abstract] |  |  |  |  |
Amortized cost | 45,202 |  | 45,202 |  | 45,385
Gross unrealized gains | 3 |  | 3 |  | 19
Gross unrealized losses | (1,055) |  | (1,055) |  | (377)
Fair value | 44,150 |  | 44,150 |  | 45,027
Available-for-sale, Debt Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 25,918 |  | 25,918 |  | 27,154
Twelve months or greater, Fair value | 17,677 |  | 17,677 |  | 13,822
Total, Fair value | 43,595 |  | 43,595 |  | 40,976
Less than twelve months, Gross unrealized losses | (399) |  | (399) |  | (190)
Twelve months or greater, Gross unrealized losses | (656) |  | (656) |  | (187)
Total, Gross Unrealized Losses | (1,055) |  | (1,055) |  | (377)
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 45,202 |  | 45,202 |  | 45,385
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Fair value | $ 44,150 |  | $ 44,150 |  | 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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