Loans and Allowance for Credit Losses - Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Net deferred loan fees	$ 3,300		$ 3,800
Accrued interest	$ 23,500		22,900
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets
Interest income on nonaccrual loans	$ 127	$ 159
Foreclosure proceedings in process	109		861
Loans, net of unearned income	4,491,167		$ 4,443,070
Financing receivable, excluding accrued interest, modified period	$ 0	$ 92
Weighted average term increase from modification (in years)	2 years
Mortgage-backed securities
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of unearned income	$ 24,000

Amount, after allowance for credit loss, of accrued interest on financing receivable.

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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, of financing receivable modified during period for debtor experiencing financial difficulty.

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Amount of interest income on financing receivable on nonaccrual status.

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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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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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