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Securities - Unrealized Loss Positions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
security
Sep. 30, 2016
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 26 20
Greater than 12 months in an unrealized loss position | security 29 31
Total | security 55 51
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,215 $ 1,209
Greater than 12 months in an unrealized loss position 11,821 10,771
Total 15,036 11,980
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 142,402 92,145
Greater than 12 months in an unrealized loss position 245,409 204,599
Total $ 387,811 $ 296,744
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security 8  
Greater than 12 months in an unrealized loss position | security 2  
Total | security 10  
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 505  
Greater than 12 months in an unrealized loss position 460  
Total 965  
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position 40,307  
Greater than 12 months in an unrealized loss position 33,842  
Total $ 74,149  
U.S. Treasury    
Securities Available-for-Sale, Number of Securities    
Greater than 12 months in an unrealized loss position | security 1  
Total | security 1  
Securities Available-for-Sale, Unrealized Losses    
Greater than 12 months in an unrealized loss position $ 127  
Total 127  
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 1,556  
Total $ 1,556  
U.S. government agencies    
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   1
Total | security 1 1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 44  
Greater than 12 months in an unrealized loss position   $ 158
Total 44 158
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,996  
Greater than 12 months in an unrealized loss position   1,503
Total $ 1,996 $ 1,503
States and political subdivisions    
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 1  
Total | security 3  
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 19  
Greater than 12 months in an unrealized loss position 81  
Total 100  
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,541  
Greater than 12 months in an unrealized loss position 1,713  
Total $ 3,254  
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 2
Greater than 12 months in an unrealized loss position | security 3 2
Total | security 8 4
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 292 $ 52
Greater than 12 months in an unrealized loss position 465 176
Total 757 228
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 14,866 5,423
Greater than 12 months in an unrealized loss position 14,534 5,307
Total $ 29,400 $ 10,730
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 10
Greater than 12 months in an unrealized loss position | security 7 6
Total | security 11 16
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 334 $ 415
Greater than 12 months in an unrealized loss position 1,513 343
Total 1,847 758
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 16,218 50,958
Greater than 12 months in an unrealized loss position 43,618 17,020
Total $ 59,836 $ 67,978
Securities Held-to-Maturity, Number of Securities    
Less than 12 months in an unrealized loss position | security 8  
Greater than 12 months in an unrealized loss position | security 2  
Total | security 10  
Securities Held-to-Maturity, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 505  
Greater than 12 months in an unrealized loss position 460  
Total 965  
Securities Held-to-Maturity, Fair Value    
Less than 12 months in an unrealized loss position 40,307  
Greater than 12 months in an unrealized loss position 33,842  
Total $ 74,149  
Asset-backed securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 9 6
Greater than 12 months in an unrealized loss position | security 8 10
Total | security 17 16
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,080 $ 694
Greater than 12 months in an unrealized loss position 7,958 8,958
Total 10,038 9,652
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 78,301 23,817
Greater than 12 months in an unrealized loss position 121,217 99,432
Total $ 199,518 $ 123,249
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 2
Greater than 12 months in an unrealized loss position | security 9 12
Total | security 14 14
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 446 $ 48
Greater than 12 months in an unrealized loss position 1,677 1,136
Total 2,123 1,184
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 29,480 11,947
Greater than 12 months in an unrealized loss position 62,771 81,337
Total $ 92,251 $ 93,284