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Securities - Unrealized Loss Positions (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 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 28 35
Greater than 12 months in an unrealized loss position | security 24 8
Total | security 52 43
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,300 $ 4,764
Greater than 12 months in an unrealized loss position 8,079 2,591
Total 11,379 7,355
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 166,128 241,626
Greater than 12 months in an unrealized loss position 194,212 68,811
Total $ 360,340 $ 310,437
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security   7
Greater than 12 months in an unrealized loss position | security 2 4
Total | security 2 11
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 457
Greater than 12 months in an unrealized loss position $ 24 982
Total 24 1,439
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position   49,302
Greater than 12 months in an unrealized loss position 34,550 46,283
Total $ 34,550 $ 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 $ 113 $ 87
Total 113 87
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 1,577 1,624
Total $ 1,577 $ 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 $ 15  
Total 15  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 2,034  
Total $ 2,034  
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1 4
Greater than 12 months in an unrealized loss position | security 1  
Total | security 2 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 28 $ 96
Greater than 12 months in an unrealized loss position 121  
Total 149 96
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,490 4,896
Greater than 12 months in an unrealized loss position 1,703  
Total $ 3,193 $ 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 $ 160 $ 486
Greater than 12 months in an unrealized loss position 420 81
Total 580 567
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 15,000 15,246
Greater than 12 months in an unrealized loss position 14,580 1,921
Total $ 29,580 $ 17,167
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 7 5
Greater than 12 months in an unrealized loss position | security 4 3
Total | security 11 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 386 $ 900
Greater than 12 months in an unrealized loss position 805 1,232
Total 1,191 2,132
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 43,651 38,284
Greater than 12 months in an unrealized loss position 19,211 21,604
Total $ 62,862 $ 59,888
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security   7
Greater than 12 months in an unrealized loss position | security 2 4
Total | security 2 11
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 457
Greater than 12 months in an unrealized loss position $ 24 982
Total 24 1,439
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position   49,302
Greater than 12 months in an unrealized loss position 34,550 46,283
Total $ 34,550 $ 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 6 3
Total | security 15 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,499 $ 1,077
Greater than 12 months in an unrealized loss position 5,554 1,191
Total 8,053 2,268
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 74,269 99,286
Greater than 12 months in an unrealized loss position 93,838 43,662
Total $ 168,107 $ 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 $ 212 $ 2,203
Greater than 12 months in an unrealized loss position 1,066  
Total 1,278 2,203
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 29,684 82,387
Greater than 12 months in an unrealized loss position 63,303  
Total $ 92,987 $ 82,387