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Investment Securities - Unrealized losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Schedule of Available-for-sale Securities      
Less than 12 Months, Fair Value $ 186,052   $ 283,243
12 Months or More, Fair Value 20,188   18,104
Total Fair Value 206,240   301,347
Less than 12 Months, Unrealized Losses (1,530)   (8,501)
12 Months or More, Unrealized Losses (402)   (261)
Total Unrealized Losses (1,932)   (8,762)
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Less than 12 Months, Fair Value 21,348   34,586
12 Months or More, Fair Value 3,954   10,438
Total Fair Value 25,302   45,024
Less than 12 Months, Unrealized Losses (125)   (198)
12 Months or More, Unrealized Losses (92)   (79)
Total Unrealized Losses (217)   (277)
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Less than 12 Months, Fair Value 40,016   122,522
12 Months or More, Fair Value 0   0
Total Fair Value 40,016   122,522
Less than 12 Months, Unrealized Losses (296)   (4,353)
12 Months or More, Unrealized Losses 0   0
Total Unrealized Losses (296)   (4,353)
Held-to-maturity Securities      
Held-to-maturity Securities, Less than 12 Months, Fair Value 1,053    
Held-to-maturity Securities, 12 Months or More, Fair Value 0    
Held-to-maturity Securities, Total Fair Value 1,053    
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses (1)    
Held-to-maturity Securities, 12 Months or More,Unrealized Losses 0    
Held-to-maturity Securities, Total Unrealized Losses   $ (1)  
U.S. Government agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Less than 12 Months, Fair Value 124,688   118,719
12 Months or More, Fair Value 16,234   7,666
Total Fair Value 140,922   126,385
Less than 12 Months, Unrealized Losses (1,109)   (3,866)
12 Months or More, Unrealized Losses (310)   (182)
Total Unrealized Losses $ (1,419)   (4,048)
Other equity securities      
Schedule of Available-for-sale Securities      
Less than 12 Months, Fair Value     7,416
12 Months or More, Fair Value     0
Total Fair Value     7,416
Less than 12 Months, Unrealized Losses     (84)
12 Months or More, Unrealized Losses     0
Total Unrealized Losses     $ (84)