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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 477,979 | $ 336,316
Gross Unrealized Gains | 21,246 | 27,183
Gross Unrealized Losses | (1,076) | (35)
Fair Value | 498,149 | 363,464
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 | 53,247 | 21,479
Gross Unrealized Gains | 186 | 220
Gross Unrealized Losses | (156) | (6)
Fair Value | 53,277 | 21,693
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 240,179 | 208,013
Gross Unrealized Gains | 17,086 | 21,000
Gross Unrealized Losses | (550) | (1)
Fair Value | 256,715 | 229,012
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 184,553 | 106,824
Gross Unrealized Gains | 3,974 | 5,963
Gross Unrealized Losses | (370) | (28)
Fair Value | $ 188,157 | $ 112,759

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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