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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 571,247 | $ 541,297
Gross Unrealized Gains | 6,382 | 20,664
Gross Unrealized Losses | (25,252) | (2,087)
Fair Value | 552,377 | 559,874
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 | 46,291 | 48,390
Gross Unrealized Gains | 23 | 30
Gross Unrealized Losses | (2,662) | (530)
Fair Value | 43,652 | 47,890
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 311,494 | 281,247
Gross Unrealized Gains | 5,736 | 17,696
Gross Unrealized Losses | (11,246) | (107)
Fair Value | 305,984 | 298,836
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 213,462 | 211,660
Gross Unrealized Gains | 623 | 2,938
Gross Unrealized Losses | (11,344) | (1,450)
Fair Value | $ 202,741 | $ 213,148

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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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