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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 406,534 | $ 300,602
Gross Unrealized Gains | 4,702 | 7,350
Gross Unrealized Losses | (3,736) | (140)
Fair Value | 407,500 | 307,812
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 63,989 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (630) |
Fair Value | 63,360 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 151,203 | 122,514
Gross Unrealized Gains | 1,233 | 1,857
Gross Unrealized Losses | (1,832) | (130)
Fair Value | 150,604 | 124,241
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 128,312 | 110,828
Gross Unrealized Gains | 1,336 | 2,228
Gross Unrealized Losses | (1,075) |
Fair Value | 128,573 | 113,056
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 63,030 | 67,260
Gross Unrealized Gains | 2,132 | 3,265
Gross Unrealized Losses | (199) | (10)
Fair Value | $ 64,963 | $ 70,515

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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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