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Securities - Unrealized Loss Positions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 19,542 $ 28,423
12 Months or More, Fair Value 15,628 109,110
Total Fair Value 35,170 137,533
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 71 162
12 Months or More, Unrealized Loss 48 2,504
Total Unrealized Loss $ 119 2,666
Other information    
Number of positions considered temporarily impaired | security 61  
Debt securities considered temporarily impaired $ 35,170 137,533
Other than temporary impairment 0  
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 6,256 997
12 Months or More, Fair Value 4,094 15,725
Total Fair Value 10,350 16,722
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 11 1
12 Months or More, Unrealized Loss 6 535
Total Unrealized Loss 17 536
Other information    
Debt securities considered temporarily impaired 10,350 16,722
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 4,099 17,934
12 Months or More, Fair Value 10,166 72,830
Total Fair Value 14,265 90,764
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 7 132
12 Months or More, Unrealized Loss 36 1,757
Total Unrealized Loss 43 1,889
Other information    
Debt securities considered temporarily impaired 14,265 90,764
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 9,187 9,492
12 Months or More, Fair Value 1,368 20,555
Total Fair Value 10,555 30,047
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 53 29
12 Months or More, Unrealized Loss 6 212
Total Unrealized Loss 59 241
Other information    
Debt securities considered temporarily impaired $ 10,555 $ 30,047