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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
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%