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Investment Securities - Unrealized losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 186,052 $ 80,631
12 Months or More, Fair Value 20,188 48,027
Total Fair Value 206,240 128,658
Less than 12 Months, Unrealized Losses (1,530) (702)
12 Months or More, Unrealized Losses (402) (645)
Total Unrealized Losses (1,932) (1,347)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 21,348 10,950
12 Months or More, Fair Value 3,954 1,737
Total Fair Value 25,302 12,687
Less than 12 Months, Unrealized Losses (125) (193)
12 Months or More, Unrealized Losses (92) (50)
Total Unrealized Losses (217) (243)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 40,016 16,776
12 Months or More, Fair Value 0 15,290
Total Fair Value 40,016 32,066
Less than 12 Months, Unrealized Losses (296) (89)
12 Months or More, Unrealized Losses 0 (225)
Total Unrealized Losses (296) (314)
Held-to-maturity Securities    
Held-to-maturity Securities, Less than 12 Months, Fair Value 1,053 1,067
Held-to-maturity Securities, 12 Months or More, Fair Value 0 0
Held-to-maturity Securities, Total Fair Value 1,053 1,067
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses (1) (6)
Held-to-maturity Securities, 12 Months or More,Unrealized Losses 0 0
Held-to-maturity Securities, Total Unrealized Losses (1) (6)
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 124,688 52,905
12 Months or More, Fair Value 16,234 31,000
Total Fair Value 140,922 83,905
Less than 12 Months, Unrealized Losses (1,109) (420)
12 Months or More, Unrealized Losses (310) (370)
Total Unrealized Losses $ (1,419) $ (790)