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Fair Values of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | $ 24,592 |  | $ 50,871
Loans Held for Sale | 46,785 |  | 29,820
Other Assets | 47,572 | [1] | 59,805
Total Assets | 1,259,749 |  | 1,161,482
Other Liabilities | 30,860 | [1] | 58,167
Total Liabilities | 30,860 |  | 58,167
Investments, Fair Value Disclosure | 1,140,800 |  | 1,020,986
Debt Securities, Available-for-Sale, Fair Value | 1,140,800 |  |
Equity securities, at fair market value | 0 |  |
Limited Partnership Investment [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | 29,757 |  | 27,137
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 3,116 |  | 3,465
US Government Agency Debt Securities Commercial [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 684,834 |  | 465,393
Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 383,455 |  | 494,599
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 947 |  | 915
Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 8,179 |  | 8,202
Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 60,269 |  | 48,412
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | 0 |  | 0
Loans Held for Sale | 0 |  | 0
Other Assets | 0 | [1] | 0
Total Assets | 0 |  | 0
Other Liabilities | 0 | [1] | 0
Total Liabilities | 0 |  | 0
Investments, Fair Value Disclosure | 0 |  | 0
Debt Securities, Available-for-Sale, Fair Value | 0 |  |
Equity securities, at fair market value | 0 |  |
Level 1 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 1 [Member] | US Government Agency Debt Securities Commercial [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 1 [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | 18,860 |  | 44,689
Loans Held for Sale | 46,785 |  | 29,820
Other Assets | 17,815 | [1] | 32,668
Total Assets | 1,224,260 |  | 1,128,163
Other Liabilities | 30,860 | [1] | 58,167
Total Liabilities | 30,860 |  | 58,167
Investments, Fair Value Disclosure | 1,140,800 |  | 1,020,986
Debt Securities, Available-for-Sale, Fair Value | 1,140,800 |  |
Equity securities, at fair market value | 0 |  |
Level 2 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 3,116 |  | 3,465
Level 2 [Member] | US Government Agency Debt Securities Commercial [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 684,834 |  | 465,393
Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 383,455 |  | 494,599
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 947 |  | 915
Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 8,179 |  | 8,202
Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 60,269 |  | 48,412
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | 5,732 |  | 6,182
Loans Held for Sale | 0 |  | 0
Other Assets | 29,757 | [1] | 27,137
Total Assets | 35,489 |  | 33,319
Other Liabilities | 0 | [1] | 0
Total Liabilities | 0 |  | 0
Investments, Fair Value Disclosure | 0 |  | 0
Debt Securities, Available-for-Sale, Fair Value | 0 |  |
Equity securities, at fair market value | 0 |  |
Level 3 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 3 [Member] | US Government Agency Debt Securities Commercial [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 3 [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 0 |  | 0
Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | $ 0 |  | $ 0
[1] | Hedging and non-hedging interest rate derivatives and limited partnership investments

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