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Fair Value - Summary of Change in MSR Assets (Detail) - MSR Assets [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Servicing Assets At Amortized Value [Line Items] |  |
Ending Balance, fair value | $ 16,500 |
Level 3 [Member] |  |
Servicing Assets At Amortized Value [Line Items] |  |
Beginning Balance | 7,084 |
Additions | 11,809 | $ 7,539
Write-offs | (959) | (61)
Amortization | (2,462) | (391)
Impairments |  | (3)
Fair value adjustments | 4,484 | 207
Ending Balance, fair value | 20,953 | 7,291
Ending Balance, amortized cost | 16,469 | $ 7,084
Level 3 [Member] | Bay Banks [Member] |  |
Servicing Assets At Amortized Value [Line Items] |  |
Additions | $ 997 |

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- Definition Amount of other-than-temporary impairment (OTTI) applied to 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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