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Regulatory Restrictions - Schedule of Capital Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Company [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 639,369 $ 610,642
Capital 744,835 684,931
Tier One Risk Based Capital 691,865 662,987
Tier One Leverage Capital 691,865 662,987
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 339,251 321,994
Capital Required for Capital Adequacy 508,876 482,991
Tier One Risk Based Capital Required for Capital Adequacy 411,947 390,993
Tier One Leverage Capital Required for Capital Adequacy $ 280,039 $ 236,904
Ratio    
Common equity Tier 1 capital ratio, actual 13.19% 13.28%
Total capital ratio, actual 15.37% 14.89%
Tier I capital ratio, actual 14.28% 14.41%
Leverage ratio, actual 9.88% 11.19%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 8.50%
Leverage ratio, for capital adequacy purposes 4.00% 4.00%
Bank [Member]    
Amount    
Common equity Tier 1 capital ratio, actual $ 682,312 $ 661,234
Capital 735,282 683,178
Tier One Risk Based Capital 682,312 661,234
Tier One Leverage Capital 682,312 661,234
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 339,125 321,866
Capital Required for Capital Adequacy 508,688 482,799
Tier One Risk Based Capital Required for Capital Adequacy 411,795 390,837
Tier One Leverage Capital Required for Capital Adequacy 280,003 236,700
Common equity Tier 1 capital ratio, to be well capitalized under prompt corrective action provisions 314,902 298,875
Capital Required to be Well Capitalized 484,465 459,808
Tier One Risk Based Capital Required to be Well Capitalized 387,572 367,846
Tier One Leverage Capital Required to be Well Capitalized $ 350,004 $ 295,875
Ratio    
Common equity Tier 1 capital ratio, actual 14.08% 14.38%
Total capital ratio, actual 15.18% 14.86%
Tier I capital ratio, actual 14.08% 14.38%
Leverage ratio, actual 9.75% 11.17%
Common equity Tier 1 capital ratio, fully phased-in regulatory guidelines minimum 7.00% 7.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 8.50%
Leverage ratio, for capital adequacy purposes 4.00% 4.00%
Common equity Tier 1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions 6.50% 6.50%
Total capital ratio, to be well capitalized under prompt corrective action provisions 10.00% 10.00%
Tier I capital ratio, to be well capitalized under prompt corrective action provisions 8.00% 8.00%
Leverage ratio, to be well capitalized under prompt corrective action provisions 5.00% 5.00%