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Fair Value - Summary of Change in MSR Assets (Detail) - MSR Assets [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Servicing Assets At Amortized Value [Line Items] |  |
Beginning Balance | $ 16,469 | $ 7,084
Additions | 5,791 | 11,809
Write-offs |  | (959)
Amortization |  | (2,462)
Change in accounting method | 4,484 |
Fair value adjustments | 2,247 |
Ending Balance, fair value | $ 28,991 |
Ending Balance, amortized cost |  | 16,469
Bay Banks [Member] |  |
Servicing Assets At Amortized Value [Line Items] |  |
Additions |  | $ 997

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-1 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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