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Regulatory Capital Requirements (Details) $ in Thousands | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Group [Member] |  |
Capital [Abstract] |  |
Actual - Total capital | $ 1,121,829 | $ 1,096,766
Actual - Tier 1 capital | 1,036,726 | 1,010,945
Actual -Common equity tier 1 capital | 919,856 | 894,075
Actual - Tier 1 leverage capital | 1,036,726 | 1,010,945
Minimum Capital - Total Capital | 712,182 | 717,974
Minimum capital - Tier 1 capital | 576,528 | 581,217
Minimum capital - Common equity tier 1 capital | 474,788 | 478,649
Minimum capital - Tier 1 leverage capital | 395,615 | 392,424
Minimum to be well capitalized - Total Capital | 678,268 | 683,785
Minimum to be well capitalized - Tier 1 capital | 542,615 | 547,028
Minimum to be well capitalized - Common equity tier 1 capital | 440,874 | 444,460
Minimum to be well capitalized - Tier 1 leverage | $ 494,519 | $ 490,530
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 0.1654 | 0.1604
Tier One Risk Based Capital to Risk Weighted Assets | 0.1528 | 0.1478
Common Equity Tier OneTo Risk Weighted Assets | 13.56% | 13.08%
Tier One Leverage Capital to Average Assets | 0.1048 | 0.1030
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 | $ 963,619 | $ 1,044,275
Actual - Tier 1 capital | 879,176 | 786,731
Actual -Common equity tier 1 capital | 879,176 | 956,845
Actual - Tier 1 leverage capital | 879,176 | 956,845
Minimum Capital - Total Capital | 706,569 | 714,480
Minimum capital - Tier 1 capital | 571,985 | 578,388
Minimum capital - Common equity tier 1 capital | 471,046 | 476,320
Minimum capital - Tier 1 leverage capital | 392,720 | 390,304
Minimum to be well capitalized - Total Capital | 672,923 | 680,457
Minimum to be well capitalized - Tier 1 capital | 538,339 | 544,366
Minimum to be well capitalized - Common equity tier 1 capital | 437,400 | 442,297
Minimum to be well capitalized - Tier 1 leverage | $ 490,900 | $ 487,879
Risk Based Ratios [Abstract] |  |
Capital to Risk Weighted Assets | 0.1432 | 0.1532
Tier One Risk Based Capital to Risk Weighted Assets | 0.1307 | 0.1406
Common Equity Tier OneTo Risk Weighted Assets | 13.07% | 14.06%
Tier One Leverage Capital to Average Assets | 0.0895 | 0.0981
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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