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Securities - Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 18 44
Greater than 12 months in an unrealized loss position | security 24 34
Total | security 42 78
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 1,404 $ 5,143
Greater than 12 months in an unrealized loss position 5,052 9,463
Total 6,456 14,606
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 71,145 216,050
Greater than 12 months in an unrealized loss position 134,583 213,060
Total $ 205,728 $ 429,110
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 $ 11  
Total 11  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 3,990  
Total $ 3,990  
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2 11
Greater than 12 months in an unrealized loss position | security   1
Total | security 2 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 39 $ 957
Greater than 12 months in an unrealized loss position   20
Total 39 977
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 6,701 40,636
Greater than 12 months in an unrealized loss position   898
Total $ 6,701 $ 41,534
U.S. government agency mortgage-backed    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2  
Greater than 12 months in an unrealized loss position | security 4  
Total | security 6  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 13  
Greater than 12 months in an unrealized loss position 106  
Total 119  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 2,089  
Greater than 12 months in an unrealized loss position 4,096  
Total $ 6,185  
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 7 12
Total | security 7 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 789 $ 273
Total 789 273
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 24,843 35,241
Total $ 24,843 $ 35,241
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security   1
Greater than 12 months in an unrealized loss position | security 3 2
Total | security 3 3
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 183
Greater than 12 months in an unrealized loss position $ 266 153
Total 266 336
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position   4,817
Greater than 12 months in an unrealized loss position 10,078 5,328
Total $ 10,078 $ 10,145
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 16
Greater than 12 months in an unrealized loss position | security 8 7
Total | security 12 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 238 $ 3,402
Greater than 12 months in an unrealized loss position 1,297 397
Total 1,535 3,799
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 21,281 117,752
Greater than 12 months in an unrealized loss position 43,684 18,109
Total $ 64,965 $ 135,861
Asset-backed securities    
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 9 12
Total | security 10 16
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 265 $ 328
Greater than 12 months in an unrealized loss position 3,383 7,997
Total 3,648 8,325
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,293 17,604
Greater than 12 months in an unrealized loss position 76,725 107,112
Total $ 81,018 $ 124,716
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1  
Greater than 12 months in an unrealized loss position | security   12
Total | security 1 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 49  
Greater than 12 months in an unrealized loss position   $ 896
Total 49 896
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 7,948  
Greater than 12 months in an unrealized loss position   81,613
Total $ 7,948 $ 81,613