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Fair Value - Summary of Change in MSR Assets Using Level 3 Inputs (Detail) - MSR Assets [Member] - Level 3 [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Servicing Assets At Amortized Value [Line Items]
Beginning Balance	$ 7,084
Additions	9,252	$ 7,539
Write-offs	(616)	(61)
Amortization	(1,741)	(391)
Impairments		(3)
Fair value adjustments	3,567	207
Ending Balance, fair value	18,543	7,291
Ending Balance, amortized cost	14,976	$ 7,084
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
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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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Amount of amortization 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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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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