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Securities - Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 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 61 26
Greater than 12 months in an unrealized loss position | security 22 22
Total | security 83 48
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,667 $ 1,457
Greater than 12 months in an unrealized loss position 5,120 3,216
Total 8,787 4,673
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 201,552 102,830
Greater than 12 months in an unrealized loss position 103,630 108,651
Total $ 305,182 $ 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 $ 108 $ 55
Total 108 55
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 3,895 3,947
Total $ 3,895 $ 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 $ 58 $ 9
Total 58 9
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 12,730 6,550
Total $ 12,730 $ 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 $ 254 $ 24
Greater than 12 months in an unrealized loss position 233 141
Total 487 165
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 9,130 5,501
Greater than 12 months in an unrealized loss position 4,714 4,843
Total $ 13,844 $ 10,344
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 42 13
Greater than 12 months in an unrealized loss position | security 2 1
Total | security 44 14
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 3,068 $ 1,237
Greater than 12 months in an unrealized loss position 1,263 27
Total 4,331 1,264
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 140,012 45,985
Greater than 12 months in an unrealized loss position 3,742 1,512
Total $ 143,754 $ 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 $ 5 $ 11
Total 5 11
Securities Available-for-Sale, Fair Value    
Greater than 12 months in an unrealized loss position 200 332
Total $ 200 $ 332
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 4 3
Greater than 12 months in an unrealized loss position | security 8 8
Total | security 12 11
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 110 $ 31
Greater than 12 months in an unrealized loss position 1,778 1,124
Total 1,888 1,155
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 21,191 11,534
Greater than 12 months in an unrealized loss position 38,589 40,219
Total $ 59,780 $ 51,753
Asset-backed securities    
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 6 7
Total | security 7 7
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 46  
Greater than 12 months in an unrealized loss position 1,841 $ 1,913
Total 1,887 1,913
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,603  
Greater than 12 months in an unrealized loss position 56,385 61,745
Total $ 57,988 $ 61,745
Collateralized loan obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2 3
Total | security 2 3
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 23 $ 101
Total 23 101
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 12,991 29,313
Total $ 12,991 $ 29,313