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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 65.60% | 61.10%
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | $ 365,662 | $ 255,346
12 Months or More | 38,763 | 112,868
Total | 404,425 | 368,214
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (5,586) | (1,675)
12 Months or More | (1,193) | (2,484)
Total | (6,779) | (4,159)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 360,076 | 253,671
12 Months or More | 37,570 | 110,384
Total | 397,646 | 364,055
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more | 0 | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more | 0 | (12)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | 0 | 468
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | 158,732 | 142,147
12 Months or More | 1,880 | 54,773
Total | 160,612 | 196,920
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (716) | (487)
12 Months or More | (27) | (864)
Total | (743) | (1,351)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 158,016 | 141,660
12 Months or More | 1,853 | 53,909
Total | 159,869 | 195,569
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | 53,491 | 11,190
12 Months or More | 751 | 3,187
Total | 54,242 | 14,377
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (1,780) | (106)
12 Months or More | (12) | (51)
Total | (1,792) | (157)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 51,711 | 11,084
12 Months or More | 739 | 3,136
Total | 52,450 | 14,220
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | 135,939 | 92,009
12 Months or More | 31,132 | 49,908
Total | 167,071 | 141,917
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (2,646) | (899)
12 Months or More | (880) | (1,371)
Total | (3,526) | (2,270)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 133,293 | 91,110
12 Months or More | 30,252 | 48,537
Total | 163,545 | 139,647
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | 348,162 | 245,346
12 Months or More | 33,763 | 107,868
Total | 381,925 | 353,214
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (5,142) | (1,492)
12 Months or More | (919) | (2,286)
Total | (6,061) | (3,778)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 343,020 | 243,854
12 Months or More | 32,844 | 105,582
Total | 375,864 | 349,436
CRA Investment Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less Than 12 Months | 17,500 | 10,000
12 Months or More | 5,000 | 5,000
Total | 22,500 | 15,000
Available-for-sale, gross unrealized losses [Abstract] |  |
Less Than 12 Months | (444) | (183)
12 Months or More | (274) | (198)
Total | (718) | (381)
Available-for-sale, fair value [Abstract] |  |
Less Than 12 Months | 17,056 | 9,817
12 Months or More | 4,726 | 4,802
Total | $ 21,782 | 14,619
Severity of impairment in percentage of fair value less than cost | 2.90% |
U.S. Treasury and Government Agencies [Member] |  |
Held-to-maturity, amortized cost [Abstract] |  |
12 months or more | $ 0 | 480
Held-to-maturity, gross unrealized losses [Abstract] |  |
12 months or more | 0 | (12)
Held-to-maturity, fair value [Abstract] |  |
12 months or more | $ 0 | $ 468

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