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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 | Sep. 30, 2021 USD ($) Security | Dec. 31, 2020 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (7,517) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 760,074 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 144 | 32
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (468) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 19,976 |
Available-for-Sale More than One Year, Number of Securities | Security | 3 |
Available-for-Sale, Gross Unrealized Loss | $ (7,985) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 780,050 | $ 178,681
Available-for-Sale, Number of Securities | Security | 147 | 32
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (3) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,945 |
Available-for-Sale Within One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (3) |
Available-for-Sale, Estimated Fair Value | $ 4,945 |
Available-for-Sale, Number of Securities | Security | 1 |
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (4,954) | $ (188)
Available-for-Sale Within One Year, Estimated Fair Value | $ 546,307 | $ 76,023
Available-for-Sale Within One Year, Number of Securities | Security | 97 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (378) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 14,699 |
Available-for-Sale More than One Year, Number of Securities | Security | 2 |
Available-for-Sale, Gross Unrealized Loss | $ (5,332) | $ (188)
Available-for-Sale, Estimated Fair Value | $ 561,006 | $ 76,023
Available-for-Sale, Number of Securities | Security | 99 | 10
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (461) | $ (217)
Available-for-Sale Within One Year, Estimated Fair Value | $ 47,720 | $ 97,659
Available-for-Sale Within One Year, Number of Securities | Security | 12 | 21
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (90) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 5,277 |
Available-for-Sale More than One Year, Number of Securities | Security | 1 |
Available-for-Sale, Gross Unrealized Loss | $ (551) | $ (217)
Available-for-Sale, Estimated Fair Value | $ 52,997 | $ 97,659
Available-for-Sale, Number of Securities | Security | 13 | 21
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (583) | $ (1)
Available-for-Sale Within One Year, Estimated Fair Value | $ 93,432 | $ 4,999
Available-for-Sale Within One Year, Number of Securities | Security | 17 | 1
Available-for-Sale, Gross Unrealized Loss | $ (583) | $ (1)
Available-for-Sale, Estimated Fair Value | $ 93,432 | $ 4,999
Available-for-Sale, Number of Securities | Security | 17 | 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 | $ (5,998) | $ (406)
Available-for-Sale Within One Year, Estimated Fair Value | $ 687,459 | $ 178,681
Available-for-Sale Within One Year, Number of Securities | Security | 126 | 32
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (468) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 19,976 |
Available-for-Sale More than One Year, Number of Securities | Security | 3 |
Available-for-Sale, Gross Unrealized Loss | $ (6,466) | $ (406)
Available-for-Sale, Estimated Fair Value | $ 707,435 | $ 178,681
Available-for-Sale, Number of Securities | Security | 129 | 32
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,516) |
Available-for-Sale Within One Year, Estimated Fair Value | $ 67,670 |
Available-for-Sale Within One Year, Number of Securities | Security | 17 |
Available-for-Sale, Gross Unrealized Loss | $ (1,516) |
Available-for-Sale, Estimated Fair Value | $ 67,670 |
Available-for-Sale, Number of Securities | Security | 17 |

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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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