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Summary of Significant Accounting Policies - Dividend (Details) - USD ($)
Nov. 05, 2018
Oct. 16, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Allowance for Loan Losses                
Loans and Leases Receivable, Allowance     $ 19,328,000 $ 19,321,000 $ 17,461,000 $ 16,465,000 $ 15,836,000 $ 16,158,000
Subsequent Event                
Allowance for Loan Losses                
Dividends Payable, Amount Per Share   $ 0.01            
Payments of Dividends $ 298,000              
All other                
Allowance for Loan Losses                
Loans and Leases Receivable, Allowance     $ 1,505,000 $ 868,000 $ 579,000 $ 814,000 $ 546,000 $ 451,000