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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,247,433 | $ 528,689
Gross Unrealized Gains | 1,452 | 4,625
Gross Unrealized Losses | (40,134) | (1,791)
Estimated Fair Value | 1,208,751 | 531,523
U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,184,289 | 455,701
Gross Unrealized Gains | 1,005 | 3,693
Gross Unrealized Losses | (38,996) | (1,766)
Estimated Fair Value | 1,146,298 | 457,628
U.S. Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,216 | 21,609
Gross Unrealized Gains | 320 | 335
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 20,534 | 21,942
Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,708 | 28,897
Gross Unrealized Gains | 51 | 400
Gross Unrealized Losses | (798) | (14)
Estimated Fair Value | 20,961 | 29,283
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,861 | 6,128
Gross Unrealized Gains | 76 | 194
Gross Unrealized Losses | (85) | (3)
Estimated Fair Value | 4,852 | 6,319
Asset backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,359 | 13,354
Gross Unrealized Gains |  | 3
Gross Unrealized Losses | (79) |
Estimated Fair Value | 13,280 | 13,357
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,000 | 3,000
Gross Unrealized Losses | (174) | (6)
Estimated Fair Value | $ 2,826 | $ 2,994

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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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