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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 953,543 | $ 899,258
Actual - Tier 1 capital | 891,807 | 842,133
Actual -Common equity tier 1 capital | 690,937 | 644,804
Actual - Tier 1 leverage capital | 891,807 | 842,133
Minimum Capital - Total Capital | 384,508 | 353,653
Minimum capital - Tier 1 capital | 288,381 | 265,240
Minimum capital - Common equity tier 1 capital | 216,286 | 198,930
Minimum capital - Tier 1 leverage capital | 255,993 | 242,057
Minimum to be well capitalized - Total Capital | 480,635 | 442,067
Minimum to be well capitalized - Tier 1 capital | 384,508 | 353,653
Minimum to be well capitalized - Common equity tier 1 capital | 312,413 | 287,343
Minimum to be well capitalized - Tier 1 leverage | $ 319,992 | $ 302,571
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 19.84% | 20.34%
Tier One Risk Based Capital to Risk Weighted Assets | 18.55% | 19.05%
Common Equity Tier OneTo Risk Weighted Assets | 14.38% | 14.59%
Tier One Leverage Capital to Average Assets | 13.93% | 13.92%
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 | $ 925,447 | $ 879,648
Actual - Tier 1 capital | 863,978 | 822,776
Actual -Common equity tier 1 capital | 863,978 | 822,776
Actual - Tier 1 leverage capital | 863,978 | 822,776
Minimum Capital - Total Capital | 383,971 | 353,265
Minimum capital - Tier 1 capital | 287,979 | 264,949
Minimum capital - Common equity tier 1 capital | 215,984 | 198,712
Minimum capital - Tier 1 leverage capital | 254,847 | 241,417
Minimum to be well capitalized - Total Capital | 479,964 | 441,581
Minimum to be well capitalized - Tier 1 capital | 383,971 | 353,265
Minimum to be well capitalized - Common equity tier 1 capital | 311,977 | 287,028
Minimum to be well capitalized - Tier 1 leverage | $ 318,559 | $ 301,771
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 19.28% | 19.92%
Tier One Risk Based Capital to Risk Weighted Assets | 18.00% | 18.63%
Common Equity Tier OneTo Risk Weighted Assets | 18.00% | 18.63%
Tier One Leverage Capital to Average Assets | 13.56% | 13.63%
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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&loc=SL5958568-112826 + Details
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