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Regulatory Matters (Narrative) (Details) | 12 Months Ended |
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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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- Definition 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 -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(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 (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + 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 (c)(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 (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition 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. + 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 (c)(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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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