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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
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%