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Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2025 USD ($) Contract	Dec. 31, 2024 USD ($)
Schedule of Investments [Line Items]
Accrued interest receivable	$ 12,717,000	$ 14,776,000
Gross unrealized losses on available for sale securities	$ 216,639,000	323,937,000
Available for sale securities in unrealized loss position | Contract	864
Available for sale securities in portfolio, number | Contract	1,045
Capitalization of banks, equal to or greater than, in the single-issue trust preferred portfolio	$ 10,000,000,000
Equity securities at estimated fair value	34,760,000	21,058,000
Carrying value of securities pledged	2,102,175,000	2,038,864,000
Held-to-maturity securities amortized cost	1,004,000	1,002,000
Held-to-maturity securities estimated fair value	$ 1,020,000	1,020,000
Fitch, AAA Rating [Member]
Schedule of Investments [Line Items]
Percentage of asset backed securities with credit rating	36.00%
Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Percentage of asset backed securities with credit rating	64.00%
Minimum [Member] | Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Percentage of repayment guaranteed by the government	97.00%
Non Agency Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	$ 42,792,000
Available for sale debt securities	$ 0
Investment Grade [Member]
Schedule of Investments [Line Items]
Percentage of asset backed securities with credit rating	99.00%
Amortized cost of available for sale single issue trust preferred securities	$ 7,489,000
Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,830,000
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 55,634,000	79,515,000
Percent of portfolio with credit support	46.00%
Amortized cost of available for sale single issue trust preferred securities	$ 572,217,000
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	1,883,613,000
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	26,052,000	42,698,000
Amortized cost of available for sale single issue trust preferred securities	416,177,000
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	114,317,000	167,114,000
Amortized cost of available for sale single issue trust preferred securities	1,467,436,000
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	4,237,000	6,531,000
Amortized cost of available for sale single issue trust preferred securities	$ 42,792,000
Residential Mortgage-Backed Securities, Non-agency [Member] | AAA [Member]
Schedule of Investments [Line Items]
Percentage of asset backed securities with credit rating	100.00%
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 11,881,000	21,571,000
Amortized cost of available for sale single issue trust preferred securities	$ 244,244,000
Corporate Bonds [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	95.00%
Corporate Bonds [Member] | Below Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	2.00%
Corporate Bonds [Member] | Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	3.00%
Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Net unrealized gains	$ 133,811,000
Held-to-maturity securities amortized cost	1,926,405,000
Held-to-maturity securities estimated fair value	1,792,594,000
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	2,381,000	$ 2,047,000
Amortized cost of available for sale single issue trust preferred securities	225,617,000
Asset-backed Securities [Member] | Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Available for sale debt securities	$ 0

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