Loans Receivable and Allowance for Credit Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 2,034	$ 4,284
Collectively evaluated for impairment	74,241	76,456
Total gross loans	76,275	80,740	$ 85,591	$ 101,466
Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	840	875
Collectively evaluated for impairment	49,256	51,229
Total gross loans	50,096	52,104	54,198	68,307
Commercial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,145	3,358
Collectively evaluated for impairment	22,654	22,985
Total gross loans	23,799	26,343	26,302	27,084
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	49	51
Collectively evaluated for impairment	2,331	2,242
Total gross loans	$ 2,380	$ 2,293	$ 5,091	$ 6,075

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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