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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 386,236 | $ 395,203
Gross Unrealized Gains | 87 | 136
Gross Unrealized Losses | (38,807) | (36,861)
Fair Value | 347,516 | 358,478
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 81,842 | 87,182
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | (7,149) | (6,913)
Fair Value | 74,693 | 80,270
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 140,928 | 140,960
Gross Unrealized Losses | (13,190) | (12,738)
Fair Value | 127,738 | 128,222
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 91,485 | 94,061
Gross Unrealized Losses | (13,081) | (11,929)
Fair Value | 78,404 | 82,132
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 71,981 | 73,000
Gross Unrealized Gains | 87 | 135
Gross Unrealized Losses | (5,387) | (5,281)
Fair Value | $ 66,681 | $ 67,854

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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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