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Summary of Significant Accounting Policies - Dividend (Details) - USD ($)
Aug. 06, 2018
Jul. 17, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Allowance for Loan Losses                
Loans and Leases Receivable, Allowance     $ 19,321,000 $ 18,188,000 $ 17,461,000 $ 15,836,000 $ 15,741,000 $ 16,158,000
Subsequent Event                
Allowance for Loan Losses                
Dividends Payable, Amount Per Share   $ 0.01            
Payments of Dividends $ 297,000              
All other                
Allowance for Loan Losses                
Loans and Leases Receivable, Allowance     $ 868,000 $ 870,000 $ 579,000 $ 546,000 $ 879,000 $ 451,000