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Regulatory Matters (Narrative) (Details)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity tier 1 ratio		7.00%	[1]	7.00%	[1]	4.50%
Tier 1 capitol ratio		8.50%	[1]	8.50%	[1]	6.00%	4.00%
Total capital ratio		10.50%	[1]	10.50%	[1]	8.00%
Leverage ratio	[1]	4.00%		4.00%
Capital requirements phased period		5 years
Capital conservation buffer				0.625%
Capital conservation buffer, full implementation		2.50%
Common equity tier 1 capital ratio, full implementation		7.00%
Tier 1 capital ratio, full implementation		8.50%
Total capital ratio, full implementation		10.50%
Well-Capitalized ratio		6.50%		6.50%
Tier 1 Capital well-capitalized ratio		8.00%		8.00%		6.00%
Tier 1 Leverage Ratio		3.00%
Risk Weight For Loans		150.00%		100.00%
Credit Conversion Factor		20.00%		0.00%
Risk wieght for servicing rights and deferred tax assets		250.00%		100.00%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk weight for equity exposures		0.00%
Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk weight for equity exposures		600.00%
[1] Includes capital conservation buffer after full phase-in where applicable.

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Capital conservation buffer

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Common Equity Tier I capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio

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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.

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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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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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