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Securities - Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded (Detail) $ in Thousands | Dec. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (9,953) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 800,439 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 158 | 32
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (2,088) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 76,905 |
Available-for-Sale More than One Year, Number of Securities | Security | 15 |
Available-for-Sale, Gross Unrealized Loss | $ (12,041) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 877,344 | $ 178,681
Available-for-Sale, Number of Securities | Security | 173 | 32
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (881) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 68,548 |
Available-for-Sale Within One Year, Number of Securities | Security | 17 |
Available-for-Sale, Gross Unrealized Loss | $ (881) |
Available-for-Sale, Estimated Fair Value | $ 68,548 |
Available-for-Sale, Number of Securities | Security | 17 |
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (61) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 8,391 |
Available-for-Sale Within One Year, Number of Securities | Security | 2 |
Available-for-Sale, Gross Unrealized Loss | $ (61) |
Available-for-Sale, Estimated Fair Value | $ 8,391 |
Available-for-Sale, Number of Securities | Security | 2 |
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (6,252) | $ (188)
Available-for-Sale Within One Year, Estimated Fair Value | $ 535,610 | $ 76,023
Available-for-Sale Within One Year, Number of Securities | Security | 102 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (1,654) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 59,457 |
Available-for-Sale More than One Year, Number of Securities | Security | 11 |
Available-for-Sale, Gross Unrealized Loss | $ (7,906) | $ (188)
Available-for-Sale, Estimated Fair Value | $ 595,067 | $ 76,023
Available-for-Sale, Number of Securities | Security | 113 | 10
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,256) | $ (217)
Available-for-Sale Within One Year, Estimated Fair Value | $ 76,894 | $ 97,659
Available-for-Sale Within One Year, Number of Securities | Security | 16 | 21
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (334) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 12,548 |
Available-for-Sale More than One Year, Number of Securities | Security | 3 |
Available-for-Sale, Gross Unrealized Loss | $ (1,590) | $ (217)
Available-for-Sale, Estimated Fair Value | $ 89,442 | $ 97,659
Available-for-Sale, Number of Securities | Security | 19 | 21
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,503) | $ (1)
Available-for-Sale Within One Year, Estimated Fair Value | $ 110,996 | $ 4,999
Available-for-Sale Within One Year, Number of Securities | Security | 21 | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (100) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 4,900 |
Available-for-Sale More than One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (1,603) | $ (1)
Available-for-Sale, Estimated Fair Value | $ 115,896 | $ 4,999
Available-for-Sale, Number of Securities | Security | 22 | 1
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (9,011) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 723,500 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 139 | 32
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (2,088) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 76,905 |
Available-for-Sale More than One Year, Number of Securities | Security | 15 |
Available-for-Sale, Gross Unrealized Loss | $ (11,099) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 800,405 | $ 178,681
Available-for-Sale, Number of Securities | Security | 154 | 32

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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