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Securities - Unrealized Loss Positions (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 64 26
Greater than 12 months in an unrealized loss position | security 24 22
Total | security 88 48
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 4,425 $ 1,457
Greater than 12 months in an unrealized loss position 5,282 3,216
Total 9,707 4,673
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 212,683 102,830
Greater than 12 months in an unrealized loss position 110,793 108,651
Total $ 323,476 $ 211,481
U.S. Treasury    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1 1
Total | security 1 1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 128 $ 55
Total 128 55
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 3,876 3,947
Total $ 3,876 $ 3,947
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 2
Total | security 4 2
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 153 $ 9
Total 153 9
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 12,216 6,550
Total $ 12,216 $ 6,550
U.S. government agency mortgage-backed    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 7 4
Greater than 12 months in an unrealized loss position | security 5 5
Total | security 12 9
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 356 $ 24
Greater than 12 months in an unrealized loss position 248 141
Total 604 165
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 8,968 5,501
Greater than 12 months in an unrealized loss position 4,439 4,843
Total $ 13,407 $ 10,344
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 43 13
Greater than 12 months in an unrealized loss position | security 2 1
Total | security 45 14
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,264 $ 1,237
Greater than 12 months in an unrealized loss position 1,271 27
Total 4,535 1,264
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 141,455 45,985
Greater than 12 months in an unrealized loss position 3,849 1,512
Total $ 145,304 $ 47,497
Corporate bonds    
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 $ 6 $ 11
Total 6 11
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 198 332
Total $ 198 $ 332
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 3 3
Greater than 12 months in an unrealized loss position | security 9 8
Total | security 12 11
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 399 $ 31
Greater than 12 months in an unrealized loss position 2,007 1,124
Total 2,406 1,155
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 20,353 11,534
Greater than 12 months in an unrealized loss position 37,782 40,219
Total $ 58,135 $ 51,753
Asset-backed securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 3  
Greater than 12 months in an unrealized loss position | security 6 7
Total | security 9 7
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 65  
Greater than 12 months in an unrealized loss position 1,736 $ 1,913
Total 1,801 1,913
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 8,451  
Greater than 12 months in an unrealized loss position 56,539 61,745
Total $ 64,990 $ 61,745
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 3 3
Greater than 12 months in an unrealized loss position | security 1  
Total | security 4 3
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 60 $ 101
Greater than 12 months in an unrealized loss position 14  
Total 74 101
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 17,364 29,313
Greater than 12 months in an unrealized loss position 7,986  
Total $ 25,350 $ 29,313