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Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Security | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Security | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | $ 261,377 |  | $ 261,377 |  | $ 312,039
Gross unrealized gains | 2,701 |  | 2,701 |  | 3,087
Gross unrealized losses | (490) |  | (490) |  | (1,109)
Fair value | $ 263,588 |  | $ 263,588 |  | 314,017
Number of securities owned with fair value less than cost | Security | 70 |  | 70 |  |
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | $ 87,877 |  | $ 87,877 |  | 106,062
Twelve months or greater, Fair value | 19,296 |  | 19,296 |  | 1,520
Total, Fair value | 107,173 |  | 107,173 |  | 107,582
Less than twelve months, Gross unrealized losses | (306) |  | (306) |  | (1,071)
Twelve months or greater, Gross unrealized losses | (184) |  | (184) |  | (38)
Total, Gross Unrealized Losses | (490) |  | (490) |  | (1,109)
Proceeds from sale of securities available-for-sale | 4,986 | $ 0 | 30,393 | $ 12,077 |
Realized investment gains (losses) [Abstract] |  |  |  |  |
Gross gains | 9 | 0 | 211 | 155 |
Gross losses | 0 | 0 | (7) | 0 |
Net gains | 9 | $ 0 | 204 | $ 155 |
Investment securities pledged as collateral | 243,900 |  | 243,900 |  | 206,300
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Due in one year or less | 52,243 |  | 52,243 |  |
Due after one year through five years | 113,014 |  | 113,014 |  |
Due after five years through ten years | 35,712 |  | 35,712 |  |
Due after ten years | 59,416 |  | 59,416 |  |
Total | 260,385 |  | 260,385 |  |
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Due in one year or less | 52,375 |  | 52,375 |  |
Due after one year through five years | 113,722 |  | 113,722 |  |
Due after five years through ten years | 35,950 |  | 35,950 |  |
Due after ten years | 59,605 |  | 59,605 |  |
Total | 261,652 |  | 261,652 |  |
U.S. Agency Securities [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | 132,555 |  | 132,555 |  | 170,276
Gross unrealized gains | 191 |  | 191 |  | 407
Gross unrealized losses | (195) |  | (195) |  | (269)
Fair value | 132,551 |  | 132,551 |  | 170,414
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 55,048 |  | 55,048 |  | 50,947
Twelve months or greater, Fair value | 7,922 |  | 7,922 |  | 0
Total, Fair value | 62,970 |  | 62,970 |  | 50,947
Less than twelve months, Gross unrealized losses | (119) |  | (119) |  | (269)
Twelve months or greater, Gross unrealized losses | (76) |  | (76) |  | 0
Total, Gross Unrealized Losses | (195) |  | (195) |  | (269)
U.S. Treasury Securities [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost |  |  |  |  | 2,999
Gross unrealized gains |  |  |  |  | 1
Gross unrealized losses |  |  |  |  | 0
Fair value |  |  |  |  | 3,000
Obligations of State and Political Subdivisions [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | 80,439 |  | 80,439 |  | 95,956
Gross unrealized gains | 1,382 |  | 1,382 |  | 1,463
Gross unrealized losses | (98) |  | (98) |  | (493)
Fair value | 81,723 |  | 81,723 |  | 96,926
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 6,146 |  | 6,146 |  | 28,398
Twelve months or greater, Fair value | 8,564 |  | 8,564 |  | 767
Total, Fair value | 14,710 |  | 14,710 |  | 29,165
Less than twelve months, Gross unrealized losses | (21) |  | (21) |  | (472)
Twelve months or greater, Gross unrealized losses | (77) |  | (77) |  | (21)
Total, Gross Unrealized Losses | (98) |  | (98) |  | (493)
Corporate Obligations [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | 3,000 |  | 3,000 |  | 3,000
Gross unrealized gains | 101 |  | 101 |  | 50
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value | 3,101 |  | 3,101 |  | 3,050
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | 44,391 |  | 44,391 |  | 37,987
Gross unrealized gains | 83 |  | 83 |  | 88
Gross unrealized losses | (197) |  | (197) |  | (347)
Fair value | 44,277 |  | 44,277 |  | 37,728
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than twelve months, Fair value | 26,683 |  | 26,683 |  | 26,717
Twelve months or greater, Fair value | 2,810 |  | 2,810 |  | 753
Total, Fair value | 29,493 |  | 29,493 |  | 27,470
Less than twelve months, Gross unrealized losses | (166) |  | (166) |  | (330)
Twelve months or greater, Gross unrealized losses | (31) |  | (31) |  | (17)
Total, Gross Unrealized Losses | (197) |  | (197) |  | (347)
Equity Securities in Financial Institutions [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized cost | 992 |  | 992 |  | 1,821
Gross unrealized gains | 944 |  | 944 |  | 1,078
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value | $ 1,936 |  | $ 1,936 |  | $ 2,899

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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