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Regulatory Capital Requirements (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 1,096,766 | $ 937,962
Actual - Tier 1 capital | 1,010,945 | 852,311
Actual -Common equity tier 1 capital | 894,075 | 735,441
Actual - Tier 1 leverage capital | 1,010,945 | 852,311
Minimum Capital - Total Capital | 717,974 | 707,789
Minimum capital - Tier 1 capital | 581,217 | 572,972
Minimum capital - Common equity tier 1 capital | 478,649 | 471,859
Minimum capital - Tier 1 leverage capital | 392,424 | 369,151
Minimum to be well capitalized - Total Capital | 683,785 | 674,085
Minimum to be well capitalized - Tier 1 capital | 547,028 | 539,268
Minimum to be well capitalized - Common equity tier 1 capital | 444,460 | 438,155
Minimum to be well capitalized - Tier 1 leverage | $ 490,530 | $ 461,438
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 0.1604 | 0.1391
Tier One Risk Based Capital to Risk Weighted Assets | 0.1478 | 0.1264
Common Equity Tier One To Risk Weighted Assets | 13.08% | 10.91%
Tier One Leverage Capital to Average Assets | 0.1030 | 0.0924
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.1050 | 0.1050
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 0.0850 | 0.0850
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets | 7.00% | 7.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.0400 | 0.0400
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000
Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | 0.0800 | 0.0800
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 | 0.0500 | 0.0500
Bank [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 1,044,275 | $ 898,812
Actual - Tier 1 capital | 786,731 | 813,444
Actual -Common equity tier 1 capital | 956,845 | 813,444
Actual - Tier 1 leverage capital | 956,845 | 813,444
Minimum Capital - Total Capital | 714,480 | 706,800
Minimum capital - Tier 1 capital | 578,388 | 572,230
Minimum capital - Common equity tier 1 capital | 476,320 | 471,303
Minimum capital - Tier 1 leverage capital | 390,304 | 367,537
Minimum to be well capitalized - Total Capital | 680,457 | 672,848
Minimum to be well capitalized - Tier 1 capital | 544,366 | 538,279
Minimum to be well capitalized - Common equity tier 1 capital | 442,297 | 437,351
Minimum to be well capitalized - Tier 1 leverage | $ 487,879 | $ 459,421
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 0.1532 | 0.1336
Tier One Risk Based Capital to Risk Weighted Assets | 0.1406 | 0.1209
Common Equity Tier One To Risk Weighted Assets | 14.06% | 12.09%
Tier One Leverage Capital to Average Assets | 0.0981 | 0.0885
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.1050 | 0.1050
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 0.0850 | 0.0850
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets | 7.00% | 7.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.0400 | 0.0400
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000
Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | 0.0800 | 0.0800
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 | 0.0500 | 0.0500

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