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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
	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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- 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

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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+ References

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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+ References

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