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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Securities [Abstract]    
Percentage of total investment with unrealized losses 36.00% 61.10%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 188,480 $ 255,346
12 months or more 40,392 112,868
Total 228,872 368,214
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (595) (1,675)
12 months or more (692) (2,484)
Total (1,287) (4,159)
Available-for-sale, fair value [Abstract]    
Less than 12 months 187,885 253,671
12 months or more 39,700 110,384
Total 227,585 364,055
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 58,160 142,147
12 months or more 1,927 54,773
Total 60,087 196,920
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (155) (487)
12 months or more (25) (864)
Total (180) (1,351)
Available-for-sale, fair value [Abstract]    
Less than 12 months 58,005 141,660
12 months or more 1,902 53,909
Total 59,907 195,569
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 10,697 11,190
12 months or more 753 3,187
Total 11,450 14,377
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (105) (106)
12 months or more (10) (51)
Total (115) (157)
Available-for-sale, fair value [Abstract]    
Less than 12 months 10,592 11,084
12 months or more 743 3,136
Total 11,335 14,220
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 109,623 92,009
12 months or more 32,712 49,908
Total 142,335 141,917
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (308) (899)
12 months or more (535) (1,371)
Total (843) (2,270)
Available-for-sale, fair value [Abstract]    
Less than 12 months 109,315 91,110
12 months or more 32,177 48,537
Total 141,492 139,647
Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 178,480 245,346
12 months or more 35,392 107,868
Total 213,872 353,214
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (568) (1,492)
12 months or more (570) (2,286)
Total (1,138) (3,778)
Available-for-sale, fair value [Abstract]    
Less than 12 months 177,912 243,854
12 months or more 34,822 105,582
Total 212,734 349,436
CRA Investments Funds [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 10,000 10,000
12 months or more 5,000 5,000
Total 15,000 15,000
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (27) (183)
12 months or more (122) (198)
Total (149) (381)
Available-for-sale, fair value [Abstract]    
Less than 12 months 9,973 9,817
12 months or more 4,878 4,802
Total $ 14,851 14,619
Severity of impairment in percentage of fair value less than cost 0.60%  
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