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Loans, Allowance for Credit Losses, and Asset Quality Information - Summary of Major Categories of Total Loans Outstanding (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 8,101,894 | $ 8,093,488
Unamortized net deferred loan costs/(fees) | 1,139 | 1,188
Total loans | $ 8,103,033 | $ 8,094,676
Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 100.00% | 100.00%
Total SBA loans included in the table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | $ 145,787 | $ 135,451
Guaranteed portions of SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 45,160 | 34,095
Unguaranteed portions of SBA loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 100,627 | 101,356
Sold portions of SBA loans with servicing retained - not included in tables above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 317,473 | 330,482
Commercial and industrial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 890,071 | $ 919,690
Commercial and industrial | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 11.00% | 11.00%
Real estate, commercial | Construction, development & other land loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 644,439 | $ 647,167
Real estate, commercial | Construction, development & other land loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 8.00% | 8.00%
Real estate, commercial | Commercial real estate - owner occupied |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 1,233,732 | $ 1,248,812
Real estate, commercial | Commercial real estate - owner occupied | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 15.00% | 16.00%
Real estate, commercial | Commercial real estate - non owner occupied |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 2,701,746 | $ 2,625,554
Real estate, commercial | Commercial real estate - non owner occupied | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 34.00% | 33.00%
Real estate, commercial | Multi-family real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 512,958 | $ 506,407
Real estate, commercial | Multi-family real estate | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 6.00% | 6.00%
Real estate, mortgage | Residential 1-4 family real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 1,709,593 | $ 1,729,322
Real estate, mortgage | Residential 1-4 family real estate | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 21.00% | 21.00%
Real estate, mortgage | Home equity loans/lines of credit |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 341,240 | $ 345,883
Real estate, mortgage | Home equity loans/lines of credit | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 4.00% | 4.00%
Consumer loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 68,115 | $ 70,653
Consumer loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 1.00% | 1.00%

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