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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 681,378 | $ 682,351
Gross Unrealized Gains | 951 | 819
Gross Unrealized Losses | (65,031) | (67,768)
Fair Value | 617,298 | 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 | 66,357 | 66,495
Gross Unrealized Gains | 18 | 20
Gross Unrealized Losses | (5,231) | (5,486)
Fair Value | 61,144 | 61,029
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 358,564 | 350,104
Gross Unrealized Gains | 922 | 784
Gross Unrealized Losses | (29,331) | (33,640)
Fair Value | 330,155 | 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 | 256,457 | 265,752
Gross Unrealized Gains | 11 | 15
Gross Unrealized Losses | (30,469) | (28,642)
Fair Value | $ 225,999 | $ 237,125

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