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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 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments |  | $ 25,200 | $ 44,700
Other Investments |  | 30,954 | 50,871
Loans Held for Sale |  | 51,991 | 29,820
Other Assets |  | 41,569 | 32,668
Total Assets |  | (1,241,183) | (1,083,474)
Other Liabilities |  | 51,983 | 58,167
Total Liabilities |  | 51,983 | 58,167
Debt Securities, Available-for-Sale |  | 1,147,623 | 1,020,986
US Government Agencies Debt Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale | [1] | 727,100 |
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 2,898 | 3,465
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 724,175 | 465,393
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 350,600 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 350,584 | 494,599
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 946 | 915
Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 7,527 | 8,202
Corporate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 61,493 | 48,412
Level 1 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans Held for Sale |  | 0 | 0
Other Assets |  | 0 | 0
Total Assets |  | 0 | 0
Other Liabilities |  | 0 | 0
Total Liabilities |  | 0 | 0
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 1 [Member] | Corporate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans Held for Sale |  | 51,991 | 29,820
Other Assets |  | 41,569 | 32,668
Total Assets |  | (1,241,183) | (1,083,474)
Other Liabilities |  | 51,983 | 58,167
Total Liabilities |  | 51,983 | 58,167
Debt Securities, Available-for-Sale |  | 1,147,623 | 1,020,986
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 2,898 | 3,465
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 724,175 | 465,393
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 350,584 | 494,599
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 946 | 915
Fair Value, Inputs, Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 7,527 | 8,202
Fair Value, Inputs, Level 2 [Member] | Corporate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 61,493 | 48,412
Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans Held for Sale |  | 0 | 0
Other Assets |  | 0 | 0
Total Assets |  | 0 | 0
Other Liabilities |  | 0 | 0
Total Liabilities |  | 0 | 0
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | 0 | 0
Level 3 [Member] | Corporate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt Securities, Available-for-Sale |  | $ 0 | $ 0
[1] | Mortgage Backed Securities include an amortized cost of $782.3 million and a fair value of $727.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $413.4 million and a fair value of $350.6 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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