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Fair Value - Summary of Change in MSR Assets Using Level 3 Inputs (Detail) - MSR Assets [Member] - Level 3 [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($)
Servicing Assets At Amortized Value [Line Items] |
Beginning Balance | $ 7,084
Additions | 11,809
Write-offs | (959)
Amortization | (2,462)
Impairments | 0
Fair value adjustments | 4,484
Ending Balance, fair value | 20,953
Ending Balance, amortized cost | 16,469
Bay Banks [Member] |
Servicing Assets At Amortized Value [Line Items] |
Additions | $ 997

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