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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands			12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables Held-for-sale [Abstract]
Multi-family loans, at lower of cost or fair value			$ 0	$ 482,873
Commercial and industrial loans, at lower of cost or fair value			55,683	0
Commercial real estate non-owner occupied loans, at lower of cost or fair value			17,251	0
Total commercial loans held for sale			72,934	482,873
Home equity conversion mortgages, at lower of cost or fair value			643	1,325
Residential mortgage loans, at fair value			5,509	2,130
Total consumer loans held for sale			6,152	3,455
Loans held for sale			79,086	486,328
Transfer of loans held for investment to held for sale	$ 401,100	$ 499,800	74,050	499,774	$ 0
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for sale			79,086	486,328
Nonperforming
Receivables Held-for-sale [Abstract]
Loans held for sale			18,500	1,300
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for sale			$ 18,500	$ 1,300

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Commercial & Industrial Loans, Held-for-Sale

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Commercial Mortgage Loans, Held-for-Sale

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Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Consumer

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Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Consumer, Home Equity Conversion

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Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Commercial, Real Estate1

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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-Publisher FASB
-Name Accounting Standards Codification
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