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Available for Sale Debt Securities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities available for sale at carrying value | $ 618,000,000.0 | $ 536,400,000 |
Amortized cost | 1,073,570,000 | 965,135,000 |
Fair value | 1,105,489,000 | 976,919,000 |
Proceeds from sales of available for sale debt securities | $ 13,905,000 | $ 0 | $ 2,212,000
Number of securities in an unrealized loss position | security | 42 | 50 |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | $ 910,393,000 | $ 936,196,000 |
Fair value | 938,413,000 | $ 947,430,000 |
Private Label Mortgage-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | $ 17,445 |  |
Number of securities in an unrealized loss position | security | 1 |  |
Unrealized losses | $ (1,300) |  |
Agency Obligations, Collateralized Mortgage Backed Securities And Asset-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 963,700,000 |  |
Fair value | 993,300,000 |  |
Available-for-sale Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost | 109,881,000 |  |
Fair value | 112,237,000 |  |
Proceeds from sales of available for sale debt securities | $ 13,900,000 |  |

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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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