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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
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