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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Group [Member]    
Capital [Abstract]    
Actual - Total capital $ 1,020,748 $ 937,962
Actual - Tier 1 capital 933,226 852,311
Actual -Common equity tier 1 capital 816,356 735,441
Actual - Tier 1 leverage capital 933,226 852,311
Minimum Capital - Total Capital 558,690 539,268
Minimum capital - Tier 1 capital 419,018 404,451
Minimum capital - Common equity tier 1 capital 314,263 303,338
Minimum capital - Tier 1 leverage capital 368,210 369,151
Minimum to be well capitalized - Total Capital 698,363 674,085
Minimum to be well capitalized - Tier 1 capital 558,690 539,268
Minimum to be well capitalized - Common equity tier 1 capital 453,936 438,155
Minimum to be well capitalized - Tier 1 leverage $ 460,263 $ 461,438
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 14.62% 13.91%
Tier One Risk Based Capital to Risk Weighted Assets 13.36% 12.64%
Common Equity Tier OneTo Risk Weighted Assets 11.69% 10.91%
Tier One Leverage Capital to Average Assets 10.14% 9.24%
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 $ 978,518 $ 898,812
Actual - Tier 1 capital 891,285 813,444
Actual -Common equity tier 1 capital 891,285 813,444
Actual - Tier 1 leverage capital 891,285 813,444
Minimum Capital - Total Capital 556,816 538,279
Minimum capital - Tier 1 capital 417,612 403,709
Minimum capital - Common equity tier 1 capital 313,209 302,782
Minimum capital - Tier 1 leverage capital 368,376 367,537
Minimum to be well capitalized - Total Capital 696,020 672,848
Minimum to be well capitalized - Tier 1 capital 556,816 538,279
Minimum to be well capitalized - Common equity tier 1 capital 452,413 437,351
Minimum to be well capitalized - Tier 1 leverage $ 460,470 $ 459,421
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 14.06% 13.36%
Tier One Risk Based Capital to Risk Weighted Assets 12.81% 12.09%
Common Equity Tier OneTo Risk Weighted Assets 12.81% 12.09%
Tier One Leverage Capital to Average Assets 9.68% 8.85%
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%