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Securities - Unrealized Loss Positions (Details)
$ in Thousands
Jun. 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 25 44
Greater than 12 months in an unrealized loss position | security 19 34
Total | security 44 78
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,479 $ 5,143
Greater than 12 months in an unrealized loss position 5,059 9,463
Total 8,538 14,606
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 116,201 216,050
Greater than 12 months in an unrealized loss position 123,663 213,060
Total $ 239,864 $ 429,110
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security   11
Greater than 12 months in an unrealized loss position | security   1
Total | security   12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position   $ 957
Greater than 12 months in an unrealized loss position   20
Total   977
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position   40,636
Greater than 12 months in an unrealized loss position   898
Total   $ 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 8  
Greater than 12 months in an unrealized loss position | security 1  
Total | security 9  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 178  
Greater than 12 months in an unrealized loss position 21  
Total 199  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 17,764  
Greater than 12 months in an unrealized loss position 805  
Total $ 18,569  
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 12
Total | security 4 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 1,052 $ 273
Total 1,052 273
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 16,372 35,241
Total $ 16,372 $ 35,241
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1 1
Greater than 12 months in an unrealized loss position | security 2 2
Total | security 3 3
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 108 $ 183
Greater than 12 months in an unrealized loss position 141 153
Total 249 336
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,892 4,817
Greater than 12 months in an unrealized loss position 5,205 5,328
Total $ 10,097 $ 10,145
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 10 16
Greater than 12 months in an unrealized loss position | security 4 7
Total | security 14 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 1,776 $ 3,402
Greater than 12 months in an unrealized loss position 187 397
Total 1,963 3,799
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 64,987 117,752
Greater than 12 months in an unrealized loss position 10,898 18,109
Total $ 75,885 $ 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 12 12
Total | security 13 16
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 274 $ 328
Greater than 12 months in an unrealized loss position 4,710 7,997
Total 4,984 8,325
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,281 17,604
Greater than 12 months in an unrealized loss position 106,755 107,112
Total $ 111,036 $ 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 $ 91  
Greater than 12 months in an unrealized loss position   $ 896
Total 91 896
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 7,905  
Greater than 12 months in an unrealized loss position   81,613
Total $ 7,905 $ 81,613