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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 439,259 | $ 433,962
Gross Unrealized Gains | 83 | 3,032
Gross Unrealized Losses | (39,655) | (7,063)
Fair Value | 399,687 | 429,931
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 105,435 | 90,775
Gross Unrealized Losses | (8,335) | (1,598)
Fair Value | 97,100 | 89,177
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 155,489 | 159,673
Gross Unrealized Gains |  | 695
Gross Unrealized Losses | (13,977) | (3,482)
Fair Value | 141,512 | 156,886
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 105,994 | 118,550
Gross Unrealized Gains |  | 839
Gross Unrealized Losses | (12,013) | (1,462)
Fair Value | 93,981 | 117,927
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 72,341 | 64,964
Gross Unrealized Gains | 83 | 1,498
Gross Unrealized Losses | (5,330) | (521)
Fair Value | $ 67,094 | $ 65,941

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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