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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 990,499 | $ 899,258
Actual - Tier 1 capital | 928,577 | 842,133
Actual -Common equity tier 1 capital | 811,707 | 644,804
Actual - Tier 1 leverage capital | 928,577 | 842,133
Minimum Capital - Total Capital | 386,977 | 353,653
Minimum capital - Tier 1 capital | 290,233 | 265,240
Minimum capital - Common equity tier 1 capital | 217,675 | 198,930
Minimum capital - Tier 1 leverage capital | 261,125 | 242,057
Minimum to be well capitalized - Total Capital | 483,721 | 442,067
Minimum to be well capitalized - Tier 1 capital | 386,977 | 353,653
Minimum to be well capitalized - Common equity tier 1 capital | 314,419 | 287,343
Minimum to be well capitalized - Tier 1 leverage | $ 326,406 | $ 302,571
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 20.48% | 20.34%
Tier One Risk Based Capital to Risk Weighted Assets | 19.20% | 19.05%
Common Equity Tier OneTo Risk Weighted Assets | 16.78% | 14.59%
Tier One Leverage Capital to Average Assets | 14.22% | 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 | $ 949,596 | $ 879,648
Actual - Tier 1 capital | 887,918 | 822,776
Actual -Common equity tier 1 capital | 887,918 | 822,776
Actual - Tier 1 leverage capital | 887,918 | 822,776
Minimum Capital - Total Capital | 385,992 | 353,265
Minimum capital - Tier 1 capital | 289,494 | 264,949
Minimum capital - Common equity tier 1 capital | 217,120 | 198,712
Minimum capital - Tier 1 leverage capital | 259,547 | 241,417
Minimum to be well capitalized - Total Capital | 482,490 | 441,581
Minimum to be well capitalized - Tier 1 capital | 385,992 | 353,265
Minimum to be well capitalized - Common equity tier 1 capital | 313,618 | 287,028
Minimum to be well capitalized - Tier 1 leverage | $ 324,434 | $ 301,771
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 19.68% | 19.92%
Tier One Risk Based Capital to Risk Weighted Assets | 18.40% | 18.63%
Common Equity Tier OneTo Risk Weighted Assets | 18.40% | 18.63%
Tier One Leverage Capital to Average Assets | 13.68% | 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%

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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