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Loans - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized	$ 3,000	$ 3,000
Loans held in portfolio, net of unearned income	38,687,158		$ 37,107,652
Non-accrual with no allowance	143,293		123,706
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	337,611		313,220
Non-accrual with no allowance	143,000		124,000
Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	1,368,951		1,288,719
Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	205,356		242,440
Loans held in portfolio, net of unearned income	707,558		593,220
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	8,558,408		8,114,183
Non-accrual with no allowance	63,562		67,245
Mortgages | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	72,198		79,340
Mortgages | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	718,940		798,130
Mortgages | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	174,145		207,317
Loans held in portfolio, net of unearned income	$ 341,912		$ 395,649

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