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Accounting Pronouncements Recently Adopted or Issued - Impact of Adopting the New Revenue Standard on Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Non-interest income:      
ATM and interchange fees $ 3,785 $ 4,313 $ 4,812
Non-interest expense:      
Other non-interest expense 11,034 9,501 7,824
Balance without Adoption of ASC 606 | ASU 2014-09      
Non-interest income:      
ATM and interchange fees 5,306 5,426 5,840
Non-interest expense:      
Other non-interest expense 12,555 10,614 8,852
Effect of Change | ASU 2014-09      
Non-interest income:      
ATM and interchange fees (1,521) (1,113) (1,028)
Non-interest expense:      
Other non-interest expense $ (1,521) $ (1,113) $ (1,028)