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Summary of Significant Accounting Policies - Dividend (Details) - USD ($)
May 07, 2018
Apr. 17, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Allowance for Loan Losses            
Loans and Leases Receivable, Allowance     $ 18,188,000 $ 17,461,000 $ 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     $ 845,000 $ 542,000 $ 837,000 $ 435,000