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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses (in hundredths) | 43.60% | 44.10%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 138,585 | $ 115,100
12 months or more | 119,483 | 172,906
Total | 258,068 | 288,006
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,427) | (663)
12 months or more | (2,879) | (4,904)
Total | (4,306) | (5,567)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 137,158 | 114,437
12 months or more | 116,604 | 168,002
Total | 253,762 | 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 | (22) | (19)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | 458 | 461
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 27,878 | 31,185
12 months or more | 54,772 | 65,209
Total | 82,650 | 96,394
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (81) | (87)
12 months or more | (1,257) | (2,053)
Total | (1,338) | (2,140)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 27,797 | 31,098
12 months or more | 53,515 | 63,156
Total | 81,312 | 94,254
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 31,676 | 8,800
12 months or more | 7,316 | 21,308
Total | 38,992 | 30,108
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (501) | (23)
12 months or more | (282) | (443)
Total | (783) | (466)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 31,175 | 8,777
12 months or more | 7,034 | 20,865
Total | 38,209 | 29,642
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 54,031 | 50,115
12 months or more | 57,395 | 86,389
Total | 111,426 | 136,504
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (642) | (442)
12 months or more | (1,340) | (2,408)
Total | (1,982) | (2,850)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 53,389 | 49,673
12 months or more | 56,055 | 83,981
Total | 109,444 | 133,654
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 113,585 | 90,100
12 months or more | 119,483 | 172,906
Total | 233,068 | 263,006
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,224) | (552)
12 months or more | (2,879) | (4,904)
Total | (4,103) | (5,456)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 112,361 | 89,548
12 months or more | 116,604 | 168,002
Total | 228,965 | 257,550
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 25,000 | 25,000
12 months or more | 0 | 0
Total | 25,000 | 25,000
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (203) | (111)
12 months or more | 0 | 0
Total | (203) | (111)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 24,797 | 24,889
12 months or more | 0 | 0
Total | $ 24,797 | 24,889
Percentage of severity of impairment in fair value (in hundredths) | 0.80% |
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 | (22) | (19)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | $ 458 | $ 461

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