Loans and Leases Held for Investment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 185,734	$ 213,480	$ 159,168
Provision for credit losses	9,800	9,300
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	13,812	14,074
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(4,000)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	241,600	234,986	245,612	$ 239,360
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)	9,800	9,700
Year-to-date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification	195
Real Estate Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	154,237	198,948	154,676
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4,572	5,478
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	131,514	130,116	137,401	145,754
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)	1,315	$ (10,160)
Real Estate Mortgage | Other Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	53,489		57,984
Real Estate Mortgage | Other Residential Real Estate | Year-to-date | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		9 months
Real Estate Mortgage | Commercial Real Estate Construction Loan Receivable | Year-to-date | Extended Maturity, Payment Delay and Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate Reduction, Loan Modifications		1.65%
Loan Modifications, Principal Forgiveness		$ 8,100
Real Estate Mortgage | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 87,548		93,334
Real Estate Mortgage | Commercial | Year-to-date | Extended Maturity, Payment Delay and Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		64 months
Real Estate Mortgage | Commercial | Year-to-date | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	10 months	13 months
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 30,434	$ 13,540	3,135
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	430	7,478
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	86,815	75,989	86,087	$ 67,833
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)	1,158	$ 15,634
Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	62,900
Nonaccrual
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, 90 or more days past due	81,600		92,700
Receivable, 30-89 days past due	28,400		15,300
Financing receivable, nonaccrual status, current	$ 75,700		51,200
three Largest Loan Relationships | Credit Concentration Risk | Nonaccrual Loans And Leases Benchmark
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of nonaccrual loans and leases	34.00%
Other Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 1,642		2,510
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification	$ 195
Other Commercial | Commercial | Year-to-date | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	65 months	16 months
Other Commercial | Commercial | Year-to-date | Combination Term Extension, Rate Reduction and Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate Reduction, Loan Modifications		5.75%
Financing Receivable, Modified, Weighted Average Term Increase from Modification		61 months
Financing Receivable, Modified, Payment Delay		3 months
Other Commercial | Commercial | Year-to-date | Extended Maturity and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate Reduction, Loan Modifications		1.95%
Financing Receivable, Modified, Weighted Average Term Increase from Modification	15 months	56 months
Venture Capital Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 28,792		625
Venture Capital Loans | Commercial | Year-to-date | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	8 months	12 months
Asset Based | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 0		$ 0
Asset Based | Commercial | Year-to-date | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		10 months