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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 251,624 | $ 220,904
Gross Unrealized Gains | 7,464 | 1,769
Gross Unrealized Losses | (47) | (380)
Fair Value | 259,041 | 222,293
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,000 | 10,023
Gross Unrealized Gains | 4 | 10
Gross Unrealized Losses |  | (12)
Fair Value | 3,004 | 10,021
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 88,120 | 61,882
Gross Unrealized Gains | 1,952 | 584
Gross Unrealized Losses | (10) | (21)
Fair Value | 90,062 | 62,445
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 100,858 | 94,998
Gross Unrealized Gains | 2,153 | 426
Gross Unrealized Losses | (31) | (227)
Fair Value | 102,980 | 95,197
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 59,646 | 54,001
Gross Unrealized Gains | 3,355 | 749
Gross Unrealized Losses | (6) | (120)
Fair Value | $ 62,995 | $ 54,630

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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=121645371&loc=d3e27161-111563 + Details
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