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Minimum Capital Requirements - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2017
Banking And Thrift [Abstract] |
Capital conservative buffer percentage | 2.50%
Description of capital adequacy purposes | Beginning in 2016, an additional conservation buffer was added to the minimum requirements for capital adequacy purposes, subject to a three year phase-in period. The capital conservative buffer will be fully phased in January 1, 2019 at 2.5 percent.

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- Definition Description of the regulatory requirements for capital adequacy purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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