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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 34.80% | 44.10%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 89,459 | $ 115,100
12 months or more | 113,361 | 172,906
Total | 202,820 | 288,006
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (399) | (663)
12 months or more | (1,636) | (4,904)
Total | (2,035) | (5,567)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 89,060 | 114,437
12 months or more | 111,725 | 168,002
Total | 200,785 | 282,439
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more | 480 | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more | (11) | (19)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | 469 | 461
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 22,178 | 31,185
12 months or more | 54,773 | 65,209
Total | 76,951 | 96,394
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (13) | (87)
12 months or more | (388) | (2,053)
Total | (401) | (2,140)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 22,165 | 31,098
12 months or more | 54,385 | 63,156
Total | 76,550 | 94,254
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 17,068 | 8,800
12 months or more | 7,297 | 21,308
Total | 24,365 | 30,108
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (179) | (23)
12 months or more | (329) | (443)
Total | (508) | (466)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 16,889 | 8,777
12 months or more | 6,968 | 20,865
Total | 23,857 | 29,642
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 50,213 | 50,115
12 months or more | 51,291 | 86,389
Total | 101,504 | 136,504
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (207) | (442)
12 months or more | (919) | (2,408)
Total | (1,126) | (2,850)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 50,006 | 49,673
12 months or more | 50,372 | 83,981
Total | 100,378 | 133,654
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 89,459 | 90,100
12 months or more | 113,361 | 172,906
Total | 202,820 | 263,006
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (399) | (552)
12 months or more | (1,636) | (4,904)
Total | (2,035) | (5,456)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 89,060 | 89,548
12 months or more | 111,725 | 168,002
Total | 200,785 | 257,550
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 0 | 25,000
12 months or more | 0 | 0
Total | 0 | 25,000
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | 0 | (111)
12 months or more | 0 | 0
Total | 0 | (111)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 0 | 24,889
12 months or more | 0 | 0
Total | 0 | 24,889
U.S. Treasury and Government Agencies [Member] |  |
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more | 480 | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more | (11) | (19)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | $ 469 | $ 461

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