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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 60.70% | 65.60%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 316,117 | $ 365,662
12 months or more | 59,674 | 38,763
Total | 375,791 | 404,425
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (3,584) | (5,586)
12 months or more | (1,158) | (1,193)
Total | (4,742) | (6,779)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 312,533 | 360,076
12 months or more | 58,516 | 37,570
Total | 371,049 | 397,646
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 139,137 | 158,732
12 months or more | 21,647 | 1,880
Total | 160,784 | 160,612
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (419) | (716)
12 months or more | (41) | (27)
Total | (460) | (743)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 138,718 | 158,016
12 months or more | 21,606 | 1,853
Total | 160,324 | 159,869
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 26,970 | 53,491
12 months or more | 2,383 | 751
Total | 29,353 | 54,242
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (742) | (1,780)
12 months or more | (21) | (12)
Total | (763) | (1,792)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 26,228 | 51,711
12 months or more | 2,362 | 739
Total | 28,590 | 52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 132,510 | 135,939
12 months or more | 30,644 | 31,132
Total | 163,154 | 167,071
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,076) | (2,646)
12 months or more | (849) | (880)
Total | (2,925) | (3,526)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 130,434 | 133,293
12 months or more | 29,795 | 30,252
Total | 160,229 | 163,545
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 298,617 | 348,162
12 months or more | 54,674 | 33,763
Total | 353,291 | 381,925
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (3,237) | (5,142)
12 months or more | (911) | (919)
Total | (4,148) | (6,061)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 295,380 | 343,020
12 months or more | 53,763 | 32,844
Total | 349,143 | 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 | (347) | (444)
12 months or more | (247) | (274)
Total | (594) | (718)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 17,153 | 17,056
12 months or more | 4,753 | 4,726
Total | $ 21,906 | $ 21,782
Severity of impairment in percentage of fair value less than cost | 2.40% |

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