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Regulatory Capital Requirements - Actual Capital Amounts and Ratios and FDIC Minimum Capital Adequacy Requirements (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
FRB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, actual amount $ 1,984,052 $ 1,396,512
Tier 1 leverage capital, actual ratio 0.0850 0.1022
Tier 1 leverage capital, minimum capital adequacy requirements, amount $ 933,491 $ 546,662
Tier 1 leverage capital, minimum capital adequacy requirements, ratio 0.0400 0.0400
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, amount $ 933,491 $ 546,662
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, ratio 4.00% 4.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,166,864 $ 683,327
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, ratio 0.0500 0.0500
Common equity Tier 1 risk-based capital, actual amount $ 1,984,052 $ 1,383,625
Common equity Tier 1 risk-based capital, actual ratio 9.98% 11.45%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, amount $ 894,957 $ 543,720
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, ratio 4.50% 4.50%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, amount $ 1,392,156 $ 845,786
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, ratio 7.00% 7.00%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,292,716 $ 785,373
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, ratio 6.50% 6.50%
Tier 1 risk-based capital, actual amount $ 1,984,052 $ 1,396,512
Tier 1 risk-based capital, actual ratio 0.0998 0.1156
Tier 1 risk-based capital, minimum capital adequacy requirements, amount $ 1,193,276 $ 724,959
Tier 1 risk-based capital, minimum capital adequacy requirements, ratio 0.0600 0.0600
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, amount $ 1,690,475 $ 1,027,026
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, ratio 8.50% 8.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,591,035 $ 966,612
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, ratio 0.0800 0.0800
Total risk-based capital, actual amount $ 2,614,625 $ 1,496,545
Total risk-based capital, actual ratio 0.1315 0.1239
Total risk-based capital, minimum capital adequacy requirements, amount $ 1,591,035 $ 966,612
Total risk-based capital, minimum capital adequacy requirements, ratio 0.0800 0.0800
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, amount $ 2,088,233 $ 1,268,679
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, ratio 10.50% 10.50%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, amount $ 1,988,794 $ 1,208,266
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, ratio 0.1000 0.1000
FDIC    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, actual amount $ 2,265,907 $ 1,343,223
Tier 1 leverage capital, actual ratio 0.0972 0.0984
Tier 1 leverage capital, minimum capital adequacy requirements, amount $ 932,593 $ 546,168
Tier 1 leverage capital, minimum capital adequacy requirements, ratio 0.04 0.0400
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, amount $ 932,593 $ 546,168
Tier 1 leverage capital, minimum capital adequacy requirements with capital conservation buffer, ratio 4.00% 4.00%
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,165,742 $ 682,709
Tier 1 leverage capital, To be well-capitalized under prompt corrective action provisions, ratio 0.0500 0.0500
Common equity Tier 1 risk-based capital, actual amount $ 2,265,907 $ 1,343,223
Common equity Tier 1 risk-based capital, actual ratio 11.42% 11.12%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, amount $ 892,544 $ 543,465
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, ratio 4.50% 4.50%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, amount $ 1,388,402 $ 845,390
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement with capital conversation buffer, ratio 7.00% 7.00%
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,289,231 $ 785,005
Common equity Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, ratio 6.50% 6.50%
Tier 1 risk-based capital, actual amount $ 2,265,907 $ 1,343,223
Tier 1 risk-based capital, actual ratio 0.1142 0.1112
Tier 1 risk-based capital, minimum capital adequacy requirements, amount $ 1,190,059 $ 724,620
Tier 1 risk-based capital, minimum capital adequacy requirements, ratio 0.0600 0.0600
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, amount $ 1,685,917 $ 1,026,545
Tier 1 risk-based capital, minimum capital adequacy requirements with capital conversation buffer, ratio 8.50% 8.50%
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, amount $ 1,586,745 $ 966,160
Tier 1 risk-based capital, To be well-capitalized under prompt corrective action provisions, ratio 0.0800 0.0800
Total risk-based capital, actual amount $ 2,458,799 $ 1,443,256
Total risk-based capital, actual ratio 0.1240 0.1195
Total risk-based capital, minimum capital adequacy requirements, amount $ 1,586,745 $ 966,160
Total risk-based capital, minimum capital adequacy requirements, ratio 0.0800 0.0800
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, amount $ 2,082,603 $ 1,268,085
Total risk-based capital, minimum capital adequacy requirements with capital conversation buffer, ratio 10.50% 10.50%
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, amount $ 1,983,432 $ 1,207,700
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, ratio 0.1000 0.1000