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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 36.00% | 61.10%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 188,480 | $ 255,346
12 months or more | 40,392 | 112,868
Total | 228,872 | 368,214
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (595) | (1,675)
12 months or more | (692) | (2,484)
Total | (1,287) | (4,159)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 187,885 | 253,671
12 months or more | 39,700 | 110,384
Total | 227,585 | 364,055
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more |  | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more |  | (12)
Held-to-maturity, fair value [Abstract] |  |
12 months or more |  | 468
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 58,160 | 142,147
12 months or more | 1,927 | 54,773
Total | 60,087 | 196,920
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (155) | (487)
12 months or more | (25) | (864)
Total | (180) | (1,351)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 58,005 | 141,660
12 months or more | 1,902 | 53,909
Total | 59,907 | 195,569
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 10,697 | 11,190
12 months or more | 753 | 3,187
Total | 11,450 | 14,377
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (105) | (106)
12 months or more | (10) | (51)
Total | (115) | (157)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 10,592 | 11,084
12 months or more | 743 | 3,136
Total | 11,335 | 14,220
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 109,623 | 92,009
12 months or more | 32,712 | 49,908
Total | 142,335 | 141,917
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (308) | (899)
12 months or more | (535) | (1,371)
Total | (843) | (2,270)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 109,315 | 91,110
12 months or more | 32,177 | 48,537
Total | 141,492 | 139,647
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 178,480 | 245,346
12 months or more | 35,392 | 107,868
Total | 213,872 | 353,214
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (568) | (1,492)
12 months or more | (570) | (2,286)
Total | (1,138) | (3,778)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 177,912 | 243,854
12 months or more | 34,822 | 105,582
Total | 212,734 | 349,436
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 10,000 | 10,000
12 months or more | 5,000 | 5,000
Total | 15,000 | 15,000
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (27) | (183)
12 months or more | (122) | (198)
Total | (149) | (381)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 9,973 | 9,817
12 months or more | 4,878 | 4,802
Total | $ 14,851 | 14,619
Severity of impairment in percentage of fair value less than cost | 0.60% |
U.S. Treasury and Government Agencies [Member] |  |
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more |  | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more |  | (12)
Held-to-maturity, fair value [Abstract] |  |
12 months or more |  | $ 468

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