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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 1,035,109 | $ 990,499
Actual - Tier 1 capital | 972,537 | 928,577
Actual -Common equity tier 1 capital | 855,667 | 811,707
Actual - Tier 1 leverage capital | 972,537 | 928,577
Minimum Capital - Total Capital | 391,635 | 386,977
Minimum capital - Tier 1 capital | 293,726 | 290,233
Minimum capital - Common equity tier 1 capital | 220,295 | 217,675
Minimum capital - Tier 1 leverage capital | 255,876 | 261,125
Minimum to be well capitalized - Total Capital | 489,544 | 483,721
Minimum to be well capitalized - Tier 1 capital | 391,635 | 386,977
Minimum to be well capitalized - Common equity tier 1 capital | 318,204 | 314,419
Minimum to be well capitalized - Tier 1 leverage | $ 319,845 | $ 326,406
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 21.14% | 20.48%
Tier One Risk Based Capital to Risk Weighted Assets | 19.87% | 19.20%
Common Equity Tier OneTo Risk Weighted Assets | 17.48% | 16.78%
Tier One Leverage Capital to Average Assets | 15.20% | 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 | $ 984,483 | $ 949,596
Actual - Tier 1 capital | 922,242 | 887,918
Actual -Common equity tier 1 capital | 922,242 | 887,918
Actual - Tier 1 leverage capital | 922,242 | 887,918
Minimum Capital - Total Capital | 390,040 | 385,992
Minimum capital - Tier 1 capital | 292,530 | 289,494
Minimum capital - Common equity tier 1 capital | 219,398 | 217,120
Minimum capital - Tier 1 leverage capital | 253,721 | 259,547
Minimum to be well capitalized - Total Capital | 487,550 | 482,490
Minimum to be well capitalized - Tier 1 capital | 390,040 | 385,992
Minimum to be well capitalized - Common equity tier 1 capital | 316,908 | 313,618
Minimum to be well capitalized - Tier 1 leverage | $ 317,152 | $ 324,434
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 20.19% | 19.68%
Tier One Risk Based Capital to Risk Weighted Assets | 18.92% | 18.40%
Common Equity Tier OneTo Risk Weighted Assets | 18.92% | 18.40%
Tier One Leverage Capital to Average Assets | 14.54% | 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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