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Regulatory Capital Requirements - Actual Capital Amounts and Ratios and FDIC Minimum Capital Adequacy Requirements (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
FRB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital, actual amount $ 2,172,179 $ 1,984,052
Tier 1 leverage capital, actual ratio 0.0901 0.0850
Tier 1 leverage capital, minimum capital adequacy requirements, amount $ 964,757 $ 933,491
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 $ 964,757 $ 933,491
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 $ 1,205,947 $ 1,166,864
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 $ 2,172,179 $ 1,984,052
Common equity Tier 1 risk-based capital, actual ratio 10.52% 9.98%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, amount $ 929,277 $ 894,957
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 $ 1,445,542 $ 1,392,156
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 $ 1,342,289 $ 1,292,716
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 $ 2,172,179 $ 1,984,052
Tier 1 risk-based capital, actual ratio 0.1052 0.0998
Tier 1 risk-based capital, minimum capital adequacy requirements, amount $ 1,239,036 $ 1,193,276
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 $ 1,755,301 $ 1,690,475
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 $ 1,652,048 $ 1,591,035
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 $ 2,801,492 $ 2,614,625
Total risk-based capital, actual ratio 0.1357 0.1315
Total risk-based capital, minimum capital adequacy requirements, amount $ 1,652,048 $ 1,591,035
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 $ 2,168,313 $ 2,088,233
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 $ 2,065,060 $ 1,988,794
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 $ 2,504,536 $ 2,265,907
Tier 1 leverage capital, actual ratio 0.1038 0.0972
Tier 1 leverage capital, minimum capital adequacy requirements, amount $ 965,017 $ 932,593
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 $ 965,017 $ 932,593
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 $ 1,206,271 $ 1,165,742
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 $ 2,504,536 $ 2,265,907
Common equity Tier 1 risk-based capital, actual ratio 12.15% 11.42%
Common equity Tier 1 risk-based capital, minimum capital adequacy requirement, amount $ 927,732 $ 892,544
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 $ 1,443,138 $ 1,388,402
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 $ 1,340,057 $ 1,289,231
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 $ 2,504,536 $ 2,265,907
Tier 1 risk-based capital, actual ratio 0.1215 0.1142
Tier 1 risk-based capital, minimum capital adequacy requirements, amount $ 1,236,975 $ 1,190,059
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 $ 1,752,382 $ 1,685,917
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 $ 1,649,301 $ 1,586,745
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 $ 2,696,167 $ 2,458,799
Total risk-based capital, actual ratio 0.1308 0.1240
Total risk-based capital, minimum capital adequacy requirements, amount $ 1,649,301 $ 1,586,745
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 $ 2,164,707 $ 2,082,603
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 $ 2,061,626 $ 1,983,432
Total risk-based capital, to be well-capitalized under prompt corrective action provisions, ratio 0.1000 0.1000