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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

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