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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 | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 8,093,488 | $ 8,150,280
Unamortized net deferred loan costs/(fees) | 1,188 | (178)
Total loans | $ 8,094,676 | $ 8,150,102
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 | $ 135,451 | $ 143,246
Guaranteed portions of SBA Loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 34,095 | 35,462
Unguaranteed portions of SBA Loans included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 101,356 | 107,784
Sold portions of SBA loans with servicing retained - not included in table above |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 330,482 | 349,275
Commercial and industrial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 919,690 | $ 905,862
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 | $ 647,167 | $ 992,980
Real estate, commercial | Construction, development & other land loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 8.00% | 12.00%
Real estate, commercial | Commercial real estate - owner occupied |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 1,248,812 | $ 1,259,022
Real estate, commercial | Commercial real estate - owner occupied | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 16.00% | 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 | $ 2,625,554 | $ 2,528,060
Real estate, commercial | Commercial real estate - non owner occupied | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 33.00% | 31.00%
Real estate, commercial | Multi-family real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit loss, fee, and loan in process | $ 506,407 | $ 421,376
Real estate, commercial | Multi-family real estate | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 6.00% | 5.00%
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 | $ 1,729,322 | $ 1,639,469
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% | 20.00%
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 | $ 345,883 | $ 335,068
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 | $ 70,653 | $ 68,443
Consumer loans | Financing Receivable | Loan Category Concentration Risk |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Percentage | 1.00% | 1.00%

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