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Long-Term Borrowings - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2025
Debt Instrument [Line Items]
Carrying value of loans pledged as collateral for FHLB advances	$ 24,411,604,000	$ 21,401,649,000
Unused borrowing amount				$ 9,192,225,000
FHLB advances	250,000,000	260,199,000
Outstanding balances of debentures	$ 281,817,000	280,221,000
Maximum time to defer payment of interest on subordinate debt	5 years
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 250,000,000	260,199,000
Two Thousand And Twenty Five [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	250,000,000
Long-Term Borrowings [Member]
Debt Instrument [Line Items]
Interest paid	23,726,000	$ 44,911,000	$ 84,775,000
Federal Home Loan Bank Borrowings [Member] | Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Carrying value of loans pledged as collateral for FHLB advances	$ 8,163,013,000

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