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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Group [Member]    
Capital [Abstract]    
Actual - Total capital $ 1,040,987 $ 937,962
Actual - Tier 1 capital 953,769 852,311
Actual -Common equity tier 1 capital 836,899 735,441
Actual - Tier 1 leverage capital 953,769 852,311
Minimum Capital - Total Capital 556,632 539,268
Minimum capital - Tier 1 capital 417,474 404,451
Minimum capital - Common equity tier 1 capital 313,106 303,338
Minimum capital - Tier 1 leverage capital 375,475 369,151
Minimum to be well capitalized - Total Capital 695,791 674,085
Minimum to be well capitalized - Tier 1 capital 556,632 539,268
Minimum to be well capitalized - Common equity tier 1 capital 452,264 438,155
Minimum to be well capitalized - Tier 1 leverage $ 469,344 $ 461,438
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 14.96% 13.91%
Tier One Risk Based Capital to Risk Weighted Assets 13.71% 12.64%
Common Equity Tier OneTo Risk Weighted Assets 12.03% 10.91%
Tier One Leverage Capital to Average Assets 10.16% 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 $ 998,432 $ 898,812
Actual - Tier 1 capital 911,553 813,444
Actual -Common equity tier 1 capital 911,553 813,444
Actual - Tier 1 leverage capital 911,553 813,444
Minimum Capital - Total Capital 554,439 538,279
Minimum capital - Tier 1 capital 415,829 403,709
Minimum capital - Common equity tier 1 capital 311,872 302,782
Minimum capital - Tier 1 leverage capital 373,487 367,537
Minimum to be well capitalized - Total Capital 693,049 672,848
Minimum to be well capitalized - Tier 1 capital 554,439 538,279
Minimum to be well capitalized - Common equity tier 1 capital 450,482 437,351
Minimum to be well capitalized - Tier 1 leverage $ 466,859 $ 459,421
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 14.41% 13.36%
Tier One Risk Based Capital to Risk Weighted Assets 13.15% 12.09%
Common Equity Tier OneTo Risk Weighted Assets 13.15% 12.09%
Tier One Leverage Capital to Average Assets 9.76% 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%