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, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 8,150,280	$ 6,666,548
Unamortized net deferred loan fees	(178)	(1,403)
Total loans	$ 8,150,102	$ 6,665,145
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	$ 143,246	$ 148,803
Guaranteed portions of SBA Loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	35,462	31,893
Unguaranteed portions of SBA Loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	107,784	116,910
Sold portions of SBA loans with servicing retained - not included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	349,275	392,370
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 905,862	$ 641,941
Commercial and industrial \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	11.00%	9.00%
Real estate, commercial \| Construction, development & other land loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 992,980	$ 934,176
Real estate, commercial \| Construction, development & other land loans \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	12.00%	14.00%
Real estate, commercial \| Commercial real estate - owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 1,259,022	$ 1,036,270
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	$ 2,528,060	$ 2,123,811
Real estate, commercial \| Commercial real estate - non owner occupied \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	31.00%	32.00%
Real estate, commercial \| Multi-family real estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 421,376	$ 350,180
Real estate, commercial \| Multi-family real estate \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	5.00%	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	$ 1,639,469	$ 1,195,785
Real estate, mortgage \| Residential 1-4 family real estate \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	20.00%	18.00%
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	$ 335,068	$ 323,726
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%	5.00%
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit loss, fee, and loan in process	$ 68,443	$ 60,659
Consumer loans \| Financing Receivable \| Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	1.00%	1.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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