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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 62.60% | 65.60%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 345,997 | $ 365,662
12 months or more | 39,537 | 38,763
Total | 385,534 | 404,425
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (4,763) | (5,586)
12 months or more | (1,274) | (1,193)
Total | (6,037) | (6,779)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 341,234 | 360,076
12 months or more | 38,263 | 37,570
Total | 379,497 | 397,646
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 161,565 | 158,732
12 months or more | 1,730 | 1,880
Total | 163,295 | 160,612
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (592) | (716)
12 months or more | (23) | (27)
Total | (615) | (743)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 160,973 | 158,016
12 months or more | 1,707 | 1,853
Total | 162,680 | 159,869
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 40,167 | 53,491
12 months or more | 2,089 | 751
Total | 42,256 | 54,242
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,275) | (1,780)
12 months or more | (20) | (12)
Total | (1,295) | (1,792)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 38,892 | 51,711
12 months or more | 2,069 | 739
Total | 40,961 | 52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 126,765 | 135,939
12 months or more | 30,718 | 31,132
Total | 157,483 | 167,071
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,452) | (2,646)
12 months or more | (957) | (880)
Total | (3,409) | (3,526)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 124,313 | 133,293
12 months or more | 29,761 | 30,252
Total | 154,074 | 163,545
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 328,497 | 348,162
12 months or more | 34,537 | 33,763
Total | 363,034 | 381,925
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (4,319) | (5,142)
12 months or more | (1,000) | (919)
Total | (5,319) | (6,061)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 324,178 | 343,020
12 months or more | 33,537 | 32,844
Total | 357,715 | 375,864
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 17,500 | 17,500
12 months or more | 5,000 | 5,000
Total | 22,500 | 22,500
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (444) | (444)
12 months or more | (274) | (274)
Total | (718) | (718)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 17,056 | 17,056
12 months or more | 4,726 | 4,726
Total | $ 21,782 | $ 21,782
Severity of impairment in percentage of fair value less than cost | 2.90% |

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