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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value    
Less than 12 months $ 3,475 $ 17,933
12 months or more 117,084 174,791
Total 120,559 192,724
Unrealized Losses    
Less than 12 months (4) (80)
12 months or more (1,276) (4,416)
Total (1,280) (4,496)
U.S. Treasury    
Fair Value    
Less than 12 months 0 0
12 months or more 0 1,952
Total 0 1,952
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 (32)
Total 0 (32)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 0 0
12 months or more 8,303 9,966
Total 8,303 9,966
Unrealized Losses    
Less than 12 months 0 0
12 months or more (41) (269)
Total (41) (269)
Government sponsored enterprises    
Fair Value    
Less than 12 months 499 1,997
12 months or more 21,741 33,346
Total 22,240 35,343
Unrealized Losses    
Less than 12 months (1) (3)
12 months or more (85) (469)
Total (86) (472)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 2,553 5,851
12 months or more 15,609 28,832
Total 18,162 34,683
Unrealized Losses    
Less than 12 months (2) (16)
12 months or more (88) (485)
Total (90) (501)
Mortgage-backed securities    
Fair Value    
Less than 12 months 423 10,085
12 months or more 70,128 99,321
Total 70,551 109,406
Unrealized Losses    
Less than 12 months (1) (61)
12 months or more (879) (3,049)
Total (880) (3,110)
Other debt securities    
Fair Value    
Less than 12 months 0  
12 months or more 0  
Total 0  
Unrealized Losses    
Less than 12 months 0  
12 months or more 0  
Total 0  
Bank issued trust preferred securities    
Fair Value    
Less than 12 months 0 0
12 months or more 1,303 1,374
Total 1,303 1,374
Unrealized Losses    
Less than 12 months 0 0
12 months or more (183) (112)
Total $ (183) $ (112)