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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Securities [Abstract]    
Percentage of total investment with unrealized losses 11.90% 61.10%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 8,921 $ 255,346
12 months or more 61,086 112,868
Total 70,007 368,214
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (52) (1,675)
12 months or more (585) (2,484)
Total (637) (4,159)
Available-for-sale, fair value [Abstract]    
Less than 12 months 8,869 253,671
12 months or more 60,501 110,384
Total 69,370 364,055
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 0 142,147
12 months or more 21,999 54,773
Total 21,999 196,920
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months 0 (487)
12 months or more (26) (864)
Total (26) (1,351)
Available-for-sale, fair value [Abstract]    
Less than 12 months 0 141,660
12 months or more 21,973 53,909
Total 21,973 195,569
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 3,090 11,190
12 months or more 754 3,187
Total 3,844 14,377
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (34) (106)
12 months or more (7) (51)
Total (41) (157)
Available-for-sale, fair value [Abstract]    
Less than 12 months 3,056 11,084
12 months or more 747 3,136
Total 3,803 14,220
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 5,831 92,009
12 months or more 33,333 49,908
Total 39,164 141,917
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (18) (899)
12 months or more (453) (1,371)
Total (471) (2,270)
Available-for-sale, fair value [Abstract]    
Less than 12 months 5,813 91,110
12 months or more 32,880 48,537
Total 38,693 139,647
Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 8,921 245,346
12 months or more 56,086 107,868
Total 65,007 353,214
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (52) (1,492)
12 months or more (486) (2,286)
Total (538) (3,778)
Available-for-sale, fair value [Abstract]    
Less than 12 months 8,869 243,854
12 months or more 55,600 105,582
Total 64,469 349,436
CRA Investments Funds [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 0 10,000
12 months or more 5,000 5,000
Total 5,000 15,000
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months 0 (183)
12 months or more (99) (198)
Total (99) (381)
Available-for-sale, fair value [Abstract]    
Less than 12 months 0 9,817
12 months or more 4,901 4,802
Total $ 4,901 14,619
Severity of impairment in percentage of fair value less than cost 0.40%  
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