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Securities - Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 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 51 44
Greater than 12 months in an unrealized loss position | security 30 34
Total | security 81 78
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,768 $ 5,143
Greater than 12 months in an unrealized loss position 6,869 9,463
Total 10,637 14,606
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 207,533 216,050
Greater than 12 months in an unrealized loss position 200,094 213,060
Total $ 407,627 $ 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 10  
Greater than 12 months in an unrealized loss position | security 1  
Total | security 11  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 369  
Greater than 12 months in an unrealized loss position 23  
Total 392  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 23,831  
Greater than 12 months in an unrealized loss position 890  
Total $ 24,721  
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 24 12
Total | security 24 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 572 $ 273
Total 572 273
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 76,287 35,241
Total $ 76,287 $ 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 $ 169 $ 183
Greater than 12 months in an unrealized loss position 145 153
Total 314 336
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,831 4,817
Greater than 12 months in an unrealized loss position 5,203 5,328
Total $ 10,034 $ 10,145
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 13 16
Greater than 12 months in an unrealized loss position | security 4 7
Total | security 17 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,388 $ 3,402
Greater than 12 months in an unrealized loss position 212 397
Total 2,600 3,799
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 88,320 117,752
Greater than 12 months in an unrealized loss position 11,660 18,109
Total $ 99,980 $ 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 15 12
Total | security 16 16
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 266 $ 328
Greater than 12 months in an unrealized loss position 6,147 7,997
Total 6,413 8,325
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,287 17,604
Greater than 12 months in an unrealized loss position 125,035 107,112
Total $ 129,322 $ 124,716
Collateralized loan obligations    
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 8 12
Total | security 10 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 4  
Greater than 12 months in an unrealized loss position 342 $ 896
Total 346 896
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 9,977  
Greater than 12 months in an unrealized loss position 57,306 81,613
Total $ 67,283 $ 81,613