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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 938,994 | $ 990,499
Actual - Tier 1 capital | 852,311 | 928,577
Actual -Common equity tier 1 capital | 735,441 | 811,707
Actual - Tier 1 leverage capital | 852,311 | 928,577
Minimum Capital - Total Capital | 545,953 | 386,977
Minimum capital - Tier 1 capital | 409,465 | 290,233
Minimum capital - Common equity tier 1 capital | 307,099 | 217,675
Minimum capital - Tier 1 leverage capital | 369,151 | 261,125
Minimum to be well capitalized - Total Capital | 682,441 | 483,721
Minimum to be well capitalized - Tier 1 capital | 545,953 | 386,977
Minimum to be well capitalized - Common equity tier 1 capital | 443,587 | 314,419
Minimum to be well capitalized - Tier 1 leverage | $ 461,438 | $ 326,406
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 13.76% | 20.48%
Tier One Risk Based Capital to Risk Weighted Assets | 12.49% | 19.20%
Common Equity Tier OneTo Risk Weighted Assets | 10.78% | 16.78%
Tier One Leverage Capital to Average Assets | 9.24% | 14.22%
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 | $ 899,844 | $ 949,596
Actual - Tier 1 capital | 813,444 | 887,918
Actual -Common equity tier 1 capital | 813,444 | 887,918
Actual - Tier 1 leverage capital | 813,444 | 887,918
Minimum Capital - Total Capital | 544,964 | 385,992
Minimum capital - Tier 1 capital | 408,723 | 289,494
Minimum capital - Common equity tier 1 capital | 306,542 | 217,120
Minimum capital - Tier 1 leverage capital | 367,537 | 259,547
Minimum to be well capitalized - Total Capital | 681,205 | 482,490
Minimum to be well capitalized - Tier 1 capital | 544,964 | 385,992
Minimum to be well capitalized - Common equity tier 1 capital | 442,783 | 313,618
Minimum to be well capitalized - Tier 1 leverage | $ 459,421 | $ 324,434
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 13.21% | 19.68%
Tier One Risk Based Capital to Risk Weighted Assets | 11.94% | 18.40%
Common Equity Tier OneTo Risk Weighted Assets | 11.94% | 18.40%
Tier One Leverage Capital to Average Assets | 8.85% | 13.68%
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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