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Loans - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)	$ 7,100			$ 7,800
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	6,300,000	$ 6,300,000				$ 5,700,000
Proceeds from sale of SBA loans	24,400	55,700	$ 23,100
Gain on sale of SBA loans	1,200	3,048	1,415
Financing receivable, allowance for credit loss	145,133	145,133				137,950
Allowance for credit loss adjustment	40,600	40,600
Nonperforming loan balances, excluding government guaranteed balances	26,500	26,500				22,000
Other Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	55,800	55,800				52,400
Enterprise Value Lending Portfolio Niche Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss adjustment	19,600	19,600
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	145,133	145,133	139,464	134,771	$ 142,944	137,950	$ 135,498
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	26,500	26,500				14,500
Non-Covered Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	72,081	72,081	$ 61,478	$ 58,886	$ 69,887	$ 63,231	$ 58,714
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 11,100	$ 11,100
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Baseline
Accounts, Notes, Loans and Financing Receivable [Line Items]
Growth upside forecast	0.40	0.40
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Near-term growth upside
Accounts, Notes, Loans and Financing Receivable [Line Items]
Growth upside forecast	0.30	0.30
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Moderate recession downside
Accounts, Notes, Loans and Financing Receivable [Line Items]
Growth upside forecast	0.30	0.30

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