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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 684,355 | $ 682,351
Gross Unrealized Gains | 1,948 | 819
Gross Unrealized Losses | (58,596) | (67,768)
Fair Value | 627,707 | 615,402
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 66,781 | 66,495
Gross Unrealized Gains | 22 | 20
Gross Unrealized Losses | (4,290) | (5,486)
Fair Value | 62,513 | 61,029
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 356,250 | 350,104
Gross Unrealized Gains | 1,902 | 784
Gross Unrealized Losses | (27,514) | (33,640)
Fair Value | 330,638 | 317,248
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 261,324 | 265,752
Gross Unrealized Gains | 24 | 15
Gross Unrealized Losses | (26,792) | (28,642)
Fair Value | $ 234,556 | $ 237,125

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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