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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Group [Member]    
Capital [Abstract]    
Actual - Total capital $ 1,012,112 $ 990,499
Actual - Tier 1 capital 949,794 928,577
Actual -Common equity tier 1 capital 832,924 811,707
Actual - Tier 1 leverage capital 949,794 928,577
Minimum Capital - Total Capital 389,824 386,977
Minimum capital - Tier 1 capital 292,368 290,233
Minimum capital - Common equity tier 1 capital 219,276 217,675
Minimum capital - Tier 1 leverage capital 259,456 261,125
Minimum to be well capitalized - Total Capital 487,281 483,721
Minimum to be well capitalized - Tier 1 capital 389,824 386,977
Minimum to be well capitalized - Common equity tier 1 capital 316,732 314,419
Minimum to be well capitalized - Tier 1 leverage $ 324,320 $ 326,406
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 20.77% 20.48%
Tier One Risk Based Capital to Risk Weighted Assets 19.49% 19.20%
Common Equity Tier OneTo Risk Weighted Assets 17.09% 16.78%
Tier One Leverage Capital to Average Assets 14.64% 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 $ 966,848 $ 949,596
Actual - Tier 1 capital 904,813 887,918
Actual -Common equity tier 1 capital 904,813 887,918
Actual - Tier 1 leverage capital 904,813 887,918
Minimum Capital - Total Capital 388,573 385,992
Minimum capital - Tier 1 capital 291,429 289,494
Minimum capital - Common equity tier 1 capital 218,572 217,120
Minimum capital - Tier 1 leverage capital 258,183 259,547
Minimum to be well capitalized - Total Capital 485,716 482,490
Minimum to be well capitalized - Tier 1 capital 388,573 385,992
Minimum to be well capitalized - Common equity tier 1 capital 315,715 313,618
Minimum to be well capitalized - Tier 1 leverage $ 322,728 $ 324,434
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 19.91% 19.68%
Tier One Risk Based Capital to Risk Weighted Assets 18.63% 18.40%
Common Equity Tier OneTo Risk Weighted Assets 18.63% 18.40%
Tier One Leverage Capital to Average Assets 14.02% 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%