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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 710,058 | $ 672,892
Gross Unrealized Gains | 882 | 3,059
Gross Unrealized Losses | (62,873) | (57,679)
Fair Value | 648,067 | 618,272
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost, Total securities available for sale | 100,378 | 71,418
Gross Unrealized Gains | 303 | 315
Gross Unrealized Losses | (3,294) | (4,075)
Fair Value | 97,387 | 67,658
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost, Total securities available for sale | 351,635 | 359,452
Gross Unrealized Gains | 482 | 2,725
Gross Unrealized Losses | (26,998) | (23,578)
Fair Value | 325,119 | 338,599
Mortgage-back Securities in Government Sponsored Entities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost, Total securities available for sale | 258,045 | 242,022
Gross Unrealized Gains | 97 | 19
Gross Unrealized Losses | (32,581) | (30,026)
Fair Value | $ 225,561 | $ 212,015

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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