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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 876,657 | $ 846,748
Actual - Tier 1 capital | 819,662 | 782,912
Actual -Common equity tier 1 capital | 627,733 | 594,482
Actual - Tier 1 leverage capital | 819,662 | 782,912
Minimum Capital - Total Capital | 357,404 | 391,723
Minimum capital - Tier 1 capital | 268,053 | 293,792
Minimum capital - Common equity tier 1 capital | 201,040 | 220,344
Minimum capital - Tier 1 leverage capital | 252,344 | 280,009
Minimum to be well capitalized - Total Capital | 446,756 | 489,654
Minimum to be well capitalized - Tier 1 capital | 357,404 | 391,723
Minimum to be well capitalized - Common equity tier 1 capital | 290,391 | 318,275
Minimum to be well capitalized - Tier 1 leverage | $ 315,430 | $ 350,011
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 19.62% | 17.29%
Tier One Risk Based Capital to Risk Weighted Assets | 18.35% | 15.99%
Common Equity Tier OneTo Risk Weighted Assets | 14.05% | 12.14%
Tier One Leverage Capital to Average Assets | 12.99% | 11.18%
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 6.00% | 6.00%
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | 8.00% | 8.00%
Tier One Risk Common Equity Tier One Required To Be Well Capitalized To Risk Weighted Assets | 6.50% | 6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 5.00% | 5.00%
Bank [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 857,259 | $ 815,458
Actual - Tier 1 capital | 800,544 | 751,886
Actual -Common equity tier 1 capital | 800,544 | 751,886
Actual - Tier 1 leverage capital | 800,544 | 751,886
Minimum Capital - Total Capital | 356,596 | 390,688
Minimum capital - Tier 1 capital | 267,447 | 293,016
Minimum capital - Common equity tier 1 capital | 200,585 | 219,762
Minimum capital - Tier 1 leverage capital | 251,200 | 278,399
Minimum to be well capitalized - Total Capital | 445,745 | 488,360
Minimum to be well capitalized - Tier 1 capital | 356,596 | 390,688
Minimum to be well capitalized - Common equity tier 1 capital | 289,734 | 317,434
Minimum to be well capitalized - Tier 1 leverage | $ 314,000 | $ 347,999
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 19.23% | 16.70%
Tier One Risk Based Capital to Risk Weighted Assets | 17.96% | 15.40%
Common Equity Tier OneTo Risk Weighted Assets | 17.96% | 15.40%
Tier One Leverage Capital to Average Assets | 12.75% | 10.80%
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 6.00% | 6.00%
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | 8.00% | 8.00%
Tier One Risk Common Equity Tier One Required To Be Well Capitalized To Risk Weighted Assets | 6.50% | 6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 5.00% | 5.00%

X
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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 amount of Total Capital required to be categorized as well as capitalized 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 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in 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 + 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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- Definition 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. + 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 + Details
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