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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | $ 342,192 | $ 343,323
Gross Unrealized Gains | 16,476 | 4,906
Gross Unrealized Losses | (169) | (1,935)
Fair Value | 358,499 | 346,294
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 | 19,401 | 30,623
Gross Unrealized Gains | 204 | 202
Gross Unrealized Losses | (4) | (140)
Fair Value | 19,601 | 30,685
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 193,646 | 168,993
Gross Unrealized Gains | 12,409 | 3,680
Gross Unrealized Losses | (21) | (602)
Fair Value | 206,034 | 172,071
Mortgage-back Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost, Total securities available for sale | 129,145 | 143,707
Gross Unrealized Gains | 3,863 | 1,024
Gross Unrealized Losses | (144) | (1,193)
Fair Value | $ 132,864 | $ 143,538

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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=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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