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Stockholders' Equity and Regulatory Capital (Narrative Disclosures) (Details) - right
 12 Months Ended
Jul. 15, 2008
Dec. 31, 2018
Regulatory Capital Requirements [Abstract]    
Dividend Paid of One Common Share Purchase Right for Each Outstanding Share of Common Stock 1  
Description of possible effects of noncompliance or less than adequately capitalized   Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions on the part of regulators, that if undertaken, could have a direct material effect on the Bank’s assets, liabilities and certain off-balance-sheet items as calculated under regulatory practices.