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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 | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | $ 24,435 |  | $ 50,871
Loans Held for Sale | 50,769 |  | 29,820
Other Assets | 77,972 | [1] | 59,805
Total Assets | 1,229,895 |  | 1,161,482
Other Liabilities | 70,067 | [1] | 58,167
Total Liabilities | 70,067 |  | 58,167
Investments, Fair Value Disclosure | 1,076,719 |  | 1,020,986
Debt Securities, Available-for-Sale, Fair Value | 1,071,161 |  |
Equity securities, at fair market value | 5,558 |  | 0
Limited Partnership Investment [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | 28,825 |  | 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 | 3,139 |  | 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 | 612,336 |  | 465,393
Residential Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 383,624 |  | 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 | 922 |  | 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 | 7,849 |  | 8,202
Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | 63,291 |  | 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 | 5,558 |  | 0
Other Liabilities | 0 | [1] | 0
Total Liabilities | 0 |  | 0
Investments, Fair Value Disclosure | 5,558 |  | 0
Debt Securities, Available-for-Sale, Fair Value | 0 |  |
Equity securities, at fair market value | 5,558 |  |
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 | 18,253 |  | 44,689
Loans Held for Sale | 50,769 |  | 29,820
Other Assets | 49,147 | [1] | 32,668
Total Assets | 1,189,330 |  | 1,128,163
Other Liabilities | 70,067 | [1] | 58,167
Total Liabilities | 70,067 |  | 58,167
Investments, Fair Value Disclosure | 1,071,161 |  | 1,020,986
Debt Securities, Available-for-Sale, Fair Value | 1,071,161 |  |
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 | 3,139 |  | 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 | 612,336 |  | 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 | 383,624 |  | 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 | 922 |  | 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 | 7,849 |  | 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 | 63,291 |  | 48,412
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other investments | 6,182 |  | 6,182
Loans Held for Sale | 0 |  | 0
Other Assets | 28,825 | [1] | 27,137
Total Assets | 35,007 |  | 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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