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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 896,927 | $ 876,657
Actual - Tier 1 capital | 840,704 | 819,662
Actual -Common equity tier 1 capital | 643,607 | 627,733
Actual - Tier 1 leverage capital | 840,704 | 819,662
Minimum Capital - Total Capital | 351,306 | 357,404
Minimum capital - Tier 1 capital | 263,479 | 268,053
Minimum capital - Common equity tier 1 capital | 197,609 | 201,040
Minimum capital - Tier 1 leverage capital | 245,577 | 252,344
Minimum to be well capitalized - Total Capital | 439,132 | 446,756
Minimum to be well capitalized - Tier 1 capital | 351,306 | 357,404
Minimum to be well capitalized - Common equity tier 1 capital | 285,436 | 290,391
Minimum to be well capitalized - Tier 1 leverage | $ 306,971 | $ 315,430
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 20.42% | 19.62%
Tier One Risk Based Capital to Risk Weighted Assets | 19.14% | 18.35%
Common Equity Tier OneTo Risk Weighted Assets | 14.66% | 14.05%
Tier One Leverage Capital to Average Assets | 13.69% | 12.99%
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 | $ 887,024 | $ 857,259
Actual - Tier 1 capital | 831,012 | 800,544
Actual -Common equity tier 1 capital | 831,012 | 800,544
Actual - Tier 1 leverage capital | 831,012 | 800,544
Minimum Capital - Total Capital | 351,244 | 356,596
Minimum capital - Tier 1 capital | 263,433 | 267,447
Minimum capital - Common equity tier 1 capital | 197,575 | 200,585
Minimum capital - Tier 1 leverage capital | 244,618 | 251,200
Minimum to be well capitalized - Total Capital | 439,055 | 445,745
Minimum to be well capitalized - Tier 1 capital | 351,244 | 356,596
Minimum to be well capitalized - Common equity tier 1 capital | 285,386 | 289,734
Minimum to be well capitalized - Tier 1 leverage | $ 305,773 | $ 314,000
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 20.20% | 19.23%
Tier One Risk Based Capital to Risk Weighted Assets | 18.93% | 17.96%
Common Equity Tier OneTo Risk Weighted Assets | 18.93% | 17.96%
Tier One Leverage Capital to Average Assets | 13.59% | 12.75%
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 Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the new regulatory framework. + References No definition available. + Details
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- Definition The minimum amount of Total Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: 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 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 amount of Tier 1 Leverage Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: 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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