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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale, amortized cost [Abstract]    
Due in one year or less $ 70,564  
Due after one through five years 159,006  
Due after five through ten years 83,414  
Due after ten years 42,925  
U.S. government sponsored agency mortgage-backed securities 192,751  
Amortized cost 548,660 $ 568,381
CRA investment funds 25,000  
Amortized cost 573,660 593,381
Available-for-sale, fair value [Abstract]    
Due in one year or less 70,617  
Due after one through five years 160,485  
Due after five through ten years 86,115  
Due after ten years 44,264  
U.S. government sponsored agency mortgage-backed securities 194,372  
Total debt securities 555,853 570,185
CRA investment funds 25,097  
Total securities 580,950  
Held-to-maturity, amortized cost [Abstract]    
Due in one year or less 0  
Due after one through five years 1,181  
Due after five through ten years 480  
Due after ten years 0  
U.S. government sponsored agency mortgage-backed securities 0  
Amortized cost 1,661 1,661
CRA investment funds 0  
Total securities 1,661  
Held-to-maturity, fair value [Abstract]    
Due in one year or less 0  
Due after one through five years 1,182  
Due after five through ten years 480  
Due after ten years 0  
U.S. government sponsored agency mortgage-backed securities 0  
Total debt securities 1,662 $ 1,651
CRA investment funds 0  
Total securities $ 1,662