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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 | Jun. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (4,674) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 622,023 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 114 | 32
Available-for-Sale More than One Year, Estimated Fair Value | $ 14 |
Available-for-Sale More than One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (4,674) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 622,037 | $ 178,681
Available-for-Sale, Number of Securities | Security | 115 | 32
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (3,427) | $ (188)
Available-for-Sale Within One Year, Estimated Fair Value | $ 433,473 | $ 76,023
Available-for-Sale Within One Year, Number of Securities | Security | 72 | 10
Available-for-Sale, Gross Unrealized Loss | $ (3,427) | $ (188)
Available-for-Sale, Estimated Fair Value | $ 433,473 | $ 76,023
Available-for-Sale, Number of Securities | Security | 72 | 10
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (380) | $ (217)
Available-for-Sale Within One Year, Estimated Fair Value | $ 54,099 | $ 97,659
Available-for-Sale Within One Year, Number of Securities | Security | 15 | 21
Available-for-Sale More than One Year, Estimated Fair Value | $ 14 |
Available-for-Sale More than One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (380) | $ (217)
Available-for-Sale, Estimated Fair Value | $ 54,113 | $ 97,659
Available-for-Sale, Number of Securities | Security | 16 | 21
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (416) | $ (1)
Available-for-Sale Within One Year, Estimated Fair Value | $ 82,061 | $ 4,999
Available-for-Sale Within One Year, Number of Securities | Security | 14 | 1
Available-for-Sale, Gross Unrealized Loss | $ (416) | $ (1)
Available-for-Sale, Estimated Fair Value | $ 82,061 | $ 4,999
Available-for-Sale, Number of Securities | Security | 14 | 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 | $ (4,223) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 569,633 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 101 | 32
Available-for-Sale More than One Year, Estimated Fair Value | $ 14 |
Available-for-Sale More than One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (4,223) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 569,647 | $ 178,681
Available-for-Sale, Number of Securities | Security | 102 | 32
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (451) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 52,390 |
Available-for-Sale Within One Year, Number of Securities | Security | 13 |
Available-for-Sale, Gross Unrealized Loss | $ (451) |
Available-for-Sale, Estimated Fair Value | $ 52,390 |
Available-for-Sale, Number of Securities | Security | 13 |

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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=121582814&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=121645371&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 Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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