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v3.25.4

Investment Securities - Additional Information (Detail) | 12 Months Ended
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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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- Definition This item represents the cost of single issue trust preferred securities categorized as available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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