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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Conservation Buffer 6.45%  
Common Equity Tier One Capital $ 1,390,958 $ 1,317,202
Common Equity Tier 1 Capital to Risk Weighted Assets 12.88% 12.45%
Common Equity Tier One Capital Required for Capital Adequacy $ 486,080 $ 476,260
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy - minimum required plus fully phased in capital conservation buffer $ 756,125 $ 740,849
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 7.00% 7.00%
Tier 1 Capital, Actual Amount $ 1,390,958 $ 1,317,202
Tier 1 Capital (to risk-weighted assets), Ratio 0.1288 0.1245
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 648,107 $ 635,014
Tier 1 Capital (to risk-weighted assets) For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Tier One Risk Based Capital Required for Capital Adequacy plus capital conservation buffer fully phased-in $ 918,152 $ 899,603
Tier One Based Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 8.50% 8.50%
Total Capital, Actual Amount $ 1,561,020 $ 1,439,877
Total Capital (to risk-weighted assets), Ratio 0.1445 0.1360
Total Capital For Capital Adequacy Purposes, Amount $ 864,143 $ 846,685
Total Capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Capital Required for Capital Adequacy plus capital conservation buffer fully phased-in $ 1,134,187 $ 1,111,274
Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 10.50% 10.50%
Tier 1 Capital, Actual Amount $ 1,390,958 $ 1,317,202
Tier 1 Capital (to average assets), Ratio 0.0886 0.1017
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 628,112 $ 517,938
Tier 1 Capital (to average assets) For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Banking Subsidiaries    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Conservation Buffer 6.33%  
Common Equity Tier One Capital $ 1,411,834 $ 1,318,044
Common Equity Tier 1 Capital to Risk Weighted Assets 13.08% 12.46%
Common Equity Tier One Capital Required for Capital Adequacy $ 485,775 $ 475,913
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy - minimum required plus fully phased in capital conservation buffer $ 755,651 $ 740,310
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 7.00% 7.00%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized $ 701,676 $ 687,430
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital, Actual Amount $ 1,411,834 $ 1,318,044
Tier 1 Capital (to risk-weighted assets), Ratio 0.1308 0.1246
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 647,700 $ 634,551
Tier 1 Capital (to risk-weighted assets) For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Tier One Risk Based Capital Required for Capital Adequacy plus capital conservation buffer fully phased-in $ 917,576 $ 898,947
Tier One Based Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 8.50% 8.50%
Tier 1 Capital To Be Well Capitalized Under Prompt Corrective Action Provision, Amount $ 863,601 $ 846,068
Tier 1 Capital (to risk-weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provision, Ratio 0.0800 0.0800
Total Capital, Actual Amount $ 1,546,804 $ 1,405,422
Total Capital (to risk-weighted assets), Ratio 0.1433 0.1329
Total Capital For Capital Adequacy Purposes, Amount $ 863,601 $ 846,068
Total Capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Capital Required for Capital Adequacy plus capital conservation buffer fully phased-in $ 1,133,476 $ 1,110,464
Capital Required for Capital Adequacy to Risk Weighted Assets plus capital conservation buffer fully phased-in 10.50% 10.50%
Total Capital To Be Well Capitalized Under Prompt Corrective Action Provision, Amount $ 1,079,501 $ 1,057,585
Total Capital (to risk-weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provision 0.1000 0.1000
Tier 1 Capital, Actual Amount $ 1,411,834 $ 1,318,044
Tier 1 Capital (to average assets), Ratio 0.0908 0.1022
Tier 1 Capital For Capital Adequacy Purposes, Amount $ 622,171 $ 515,797
Tier 1 Capital (to average assets) For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Tier 1 Capital To Be Well Capitalized Under Prompt Corrective Provision, Amount $ 777,714 $ 644,746
Tier 1 Capital (to average assets) To Be Well Capitalized Under Prompt Corrective Provision, Ratio 0.0500 0.0500