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Regulatory Capital (Narrative Disclosures) (Details)
 3 Months Ended
Mar. 31, 2018
Regulatory Capital Requirements [Abstract]  
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.
Capital Conservation Buffer, Initial Phase In Percent 0.625%
Capital Conservation Buffer, Yearly Phase-In Percent Increase 0.625%
Capital Conservation Buffer, Fully Phased-In Percent 2.50%