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Securities - Unrealized Loss Positions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 26 35
Greater than 12 months in an unrealized loss position | security 29 8
Total | security 55 43
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,215 $ 4,764
Greater than 12 months in an unrealized loss position 11,821 2,591
Total 15,036 7,355
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 142,402 241,626
Greater than 12 months in an unrealized loss position 245,409 68,811
Total $ 387,811 $ 310,437
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security 8 7
Greater than 12 months in an unrealized loss position | security 2 4
Total | security 10 11
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 505 $ 457
Greater than 12 months in an unrealized loss position 460 982
Total 965 1,439
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position 40,307 49,302
Greater than 12 months in an unrealized loss position 33,842 46,283
Total $ 74,149 $ 95,585
U.S. Treasury    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security   1
Total | security   1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 2
Total   2
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position   1,527
Total   $ 1,527
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Greater than 12 months in an unrealized loss position | security 1 1
Total | security 1 1
Securities Available-for-Sale, Unrealized Losses    
Greater than 12 months in an unrealized loss position $ 127 $ 87
Total 127 87
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 1,556 1,624
Total $ 1,556 $ 1,624
U.S. government agency mortgage-backed    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1  
Total | security 1  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 44  
Total 44  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,996  
Total $ 1,996  
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2 4
Greater than 12 months in an unrealized loss position | security 1  
Total | security 3 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 19 $ 96
Greater than 12 months in an unrealized loss position 81  
Total 100 96
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,541 4,896
Greater than 12 months in an unrealized loss position 1,713  
Total $ 3,254 $ 4,896
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 4
Greater than 12 months in an unrealized loss position | security 3 1
Total | security 8 5
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 292 $ 486
Greater than 12 months in an unrealized loss position 465 81
Total 757 567
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 14,866 15,246
Greater than 12 months in an unrealized loss position 14,534 1,921
Total $ 29,400 $ 17,167
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 5
Greater than 12 months in an unrealized loss position | security 7 3
Total | security 11 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 334 $ 900
Greater than 12 months in an unrealized loss position 1,513 1,232
Total 1,847 2,132
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 16,218 38,284
Greater than 12 months in an unrealized loss position 43,618 21,604
Total $ 59,836 $ 59,888
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security 8 7
Greater than 12 months in an unrealized loss position | security 2 4
Total | security 10 11
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 505 $ 457
Greater than 12 months in an unrealized loss position 460 982
Total 965 1,439
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position 40,307 49,302
Greater than 12 months in an unrealized loss position 33,842 46,283
Total $ 74,149 $ 95,585
Asset-backed securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 9 9
Greater than 12 months in an unrealized loss position | security 8 3
Total | security 17 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,080 $ 1,077
Greater than 12 months in an unrealized loss position 7,958 1,191
Total 10,038 2,268
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 78,301 99,286
Greater than 12 months in an unrealized loss position 121,217 43,662
Total $ 199,518 $ 142,948
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 12
Greater than 12 months in an unrealized loss position | security 9  
Total | security 14 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 446 $ 2,203
Greater than 12 months in an unrealized loss position 1,677  
Total 2,123 2,203
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 29,480 82,387
Greater than 12 months in an unrealized loss position 62,771  
Total $ 92,251 $ 82,387