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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Securities [Abstract]    
Percentage of total investment with unrealized losses (in hundredths) 43.60% 44.10%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 138,585 $ 115,100
12 months or more 119,483 172,906
Total 258,068 288,006
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,427) (663)
12 months or more (2,879) (4,904)
Total (4,306) (5,567)
Available-for-sale, fair value [Abstract]    
Less than 12 months 137,158 114,437
12 months or more 116,604 168,002
Total 253,762 282,439
Held-to-maturity, amortized cost [Abstract]    
12 months or more 480 480
Held-to-maturity, gross unrealized losses [Abstract]    
12 months or more (22) (19)
Held-to-maturity, fair value [Abstract]    
12 months or more 458 461
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 27,878 31,185
12 months or more 54,772 65,209
Total 82,650 96,394
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (81) (87)
12 months or more (1,257) (2,053)
Total (1,338) (2,140)
Available-for-sale, fair value [Abstract]    
Less than 12 months 27,797 31,098
12 months or more 53,515 63,156
Total 81,312 94,254
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 31,676 8,800
12 months or more 7,316 21,308
Total 38,992 30,108
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (501) (23)
12 months or more (282) (443)
Total (783) (466)
Available-for-sale, fair value [Abstract]    
Less than 12 months 31,175 8,777
12 months or more 7,034 20,865
Total 38,209 29,642
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 54,031 50,115
12 months or more 57,395 86,389
Total 111,426 136,504
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (642) (442)
12 months or more (1,340) (2,408)
Total (1,982) (2,850)
Available-for-sale, fair value [Abstract]    
Less than 12 months 53,389 49,673
12 months or more 56,055 83,981
Total 109,444 133,654
Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 113,585 90,100
12 months or more 119,483 172,906
Total 233,068 263,006
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,224) (552)
12 months or more (2,879) (4,904)
Total (4,103) (5,456)
Available-for-sale, fair value [Abstract]    
Less than 12 months 112,361 89,548
12 months or more 116,604 168,002
Total 228,965 257,550
CRA Investments Funds [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 25,000 25,000
12 months or more 0 0
Total 25,000 25,000
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (203) (111)
12 months or more 0 0
Total (203) (111)
Available-for-sale, fair value [Abstract]    
Less than 12 months 24,797 24,889
12 months or more 0 0
Total $ 24,797 24,889
Percentage of severity of impairment in fair value (in hundredths) 0.80%  
U.S. Treasury and Government Agencies [Member]    
Held-to-maturity, amortized cost [Abstract]    
12 months or more $ 480 480
Held-to-maturity, gross unrealized losses [Abstract]    
12 months or more (22) (19)
Held-to-maturity, fair value [Abstract]    
12 months or more $ 458 $ 461