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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, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (406) | $ (318)
Available-for-Sale Within One Year, Estimated Fair Value | $ 178,681 | $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security | 32 | 33
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (483)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security |  | 51
Available-for-Sale, Gross Unrealized Loss | $ (406) | $ (801)
Available-for-Sale, Estimated Fair Value | $ 178,681 | $ 162,606
Available-for-Sale, Number of Securities | Security | 32 | 84
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (188) | $ (186)
Available-for-Sale Within One Year, Estimated Fair Value | $ 76,023 | $ 51,261
Available-for-Sale Within One Year, Number of Securities | Security | 10 | 17
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (160)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 18,757
Available-for-Sale More than One Year, Number of Securities | Security |  | 14
Available-for-Sale, Gross Unrealized Loss | $ (188) | $ (346)
Available-for-Sale, Estimated Fair Value | $ 76,023 | $ 70,018
Available-for-Sale, Number of Securities | Security | 10 | 31
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (217) | $ (112)
Available-for-Sale Within One Year, Estimated Fair Value | $ 97,659 | $ 41,419
Available-for-Sale Within One Year, Number of Securities | Security | 21 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (320)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 39,936
Available-for-Sale More than One Year, Number of Securities | Security |  | 36
Available-for-Sale, Gross Unrealized Loss | $ (217) | $ (432)
Available-for-Sale, Estimated Fair Value | $ 97,659 | $ 81,355
Available-for-Sale, Number of Securities | Security | 21 | 50
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1) | $ (20)
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,999 | $ 8,236
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (3)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 2,997
Available-for-Sale More than One Year, Number of Securities | Security |  | 1
Available-for-Sale, Gross Unrealized Loss | $ (1) | $ (23)
Available-for-Sale, Estimated Fair Value | $ 4,999 | $ 11,233
Available-for-Sale, Number of Securities | Security | 1 | 3
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (406) | $ (318)
Available-for-Sale Within One Year, Estimated Fair Value | $ 178,681 | $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security | 32 | 33
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ (483)
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security |  | 51
Available-for-Sale, Gross Unrealized Loss | $ (406) | $ (801)
Available-for-Sale, Estimated Fair Value | $ 178,681 | $ 162,606
Available-for-Sale, Number of Securities | Security | 32 | 84

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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 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: 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 + 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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- 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=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 + Details
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