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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale, amortized cost [Abstract]    
Due in one year or less $ 58,967  
Due after one through five years 128,058  
Due after five through ten years 40,962  
Due after ten years 124,960  
U.S. government sponsored agency mortgage-backed securities 226,466  
Amortized cost 579,413 $ 583,939
CRA investment funds 25,000  
Amortized cost 604,413 608,939
Available-for-sale, fair value [Abstract]    
Due in one year or less 58,968  
Due after one through five years 128,883  
Due after five through ten years 41,804  
Due after ten years 124,860  
U.S. government sponsored agency mortgage-backed securities 223,998  
Total debt securities 578,513 581,036
CRA investment funds 24,520  
Total securities 603,033 605,394
Held-to-maturity, amortized cost [Abstract]    
Due in one year or less 0  
Due after one through five years 858  
Due after five through ten years 0  
Due after ten years 0  
U.S. government sponsored agency mortgage-backed securities 0  
Amortized cost 858 866
CRA investment funds 0  
Total securities 858  
Held-to-maturity, fair value [Abstract]    
Due in one year or less 0  
Due after one through five years 858  
Due after five through ten years 0  
Due after ten years 0  
U.S. government sponsored agency mortgage-backed securities 0  
Total debt securities 858 $ 867
CRA investment funds 0  
Total securities $ 858