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Loans - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)	$ 7,600		$ 7,800
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	6,000,000			$ 5,700,000
Proceeds from sale of SBA loans	31,300	$ 23,100
Gain on sale of SBA loans	1,895	1,394
Financing receivable, allowance for credit loss	142,944			137,950
Allowance for credit loss adjustment	39,200
Nonperforming loan balances, excluding government guaranteed balances	22,600			22,000
Other Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	53,100			52,400
Enterprise Value Lending Portfolio Niche Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss adjustment	15,500
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	142,944	135,498	134,771	137,950
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	21,700			14,500
Non-Covered Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	69,887	$ 58,714	$ 58,886	$ 63,231
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 14,600
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans | Baseline
Accounts, Notes, Loans and Financing Receivable [Line Items]
Growth upside forecast	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
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

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