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Regulatory Capital Requirements - Required Ratios (Details)	12 Months Ended
	Dec. 31, 2015	Jan. 01, 2019	Jan. 01, 2016	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)	4.50%
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)	6.00%			4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%			8.00%
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)	4.00%			4.00%
Phase-in period	4 years
Scenario, Forecast
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum ratio of Common Equity Tier 1 capital to risk-weighed assets		4.50%
Minimum ratio of Common Equity Tier 1 capital to risk-weighed assets, capital conservation buffer		2.50%	0.625%
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)		7.00%
Minimum ratio of Tier 1 capital to risk-weighted assets		6.00%
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)		8.50%
Minimum ratio of Total capital to risk-weighted assets		8.00%
Capital Required for Capital Adequacy to Risk Weighted Assets		10.50%
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)		4.00%

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Capital Required for Capital Adequacy to Risk Weighted Assets, Without Capital Conservation Buffer

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Tier One Common Equity Required For Capital Adequacy To Risk Weighed Assets, Capital Conservation Buffer, Phase In Period

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Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets, Without Capital Conservation Buffer

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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