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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Available-for-sale, amortized cost [Abstract]          
Due in one year or less $ 22,117   $ 22,117    
Due after one through five years 114,754   114,754    
Due after five through ten years 127,998   127,998    
Due after ten years 50,627   50,627    
U.S. government sponsored agency mortgage-backed securities 239,017   239,017    
Total debt securities 554,513   554,513   $ 613,395
CRA investment funds 25,000   25,000    
Amortized cost 579,513   579,513   638,395
Available-for-sale, fair value [Abstract]          
Due in one year or less 22,209   22,209    
Due after one through five years 115,899   115,899    
Due after five through ten years 127,897   127,897    
Due after ten years 50,870   50,870    
U.S. government sponsored agency mortgage-backed securities 239,564   239,564    
Total debt securities 556,439   556,439   615,297
CRA investment funds 24,797   24,797    
Total securities 581,236   581,236    
Held-to-maturity, amortized cost [Abstract]          
Due in one year or less 0   0    
Due after one through five years 1,181   1,181    
Due after five through ten years 480   480    
Due after ten years 0   0    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,661   1,661   1,662
CRA investment funds 0   0    
Total securities 1,661   1,661    
Held-to-maturity, fair value [Abstract]          
Due in one year or less 0   0    
Due after one through five years 1,183   1,183    
Due after five through ten years 458   458    
Due after ten years 0   0    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,641   1,641   1,644
CRA investment funds 0   0    
Total securities 1,641   1,641    
Securities gains (loss), net (14) $ (51) 130 $ (111)  
Realized pre-tax gain on sale of securities     828    
Realized pre-tax loss on sale of securities     698    
Amortized cost of securities pledged as collateral to secure public deposit and for other purposes 227,300   227,300   267,100
Amortized cost of securities sold under agreements to repurchase $ 272,600   $ 272,600   $ 280,900