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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Receivables Held-for-sale [Abstract]
Commercial and industrial loans, at lower of cost or fair value	$ 0	$ 55,683
Commercial real estate non-owner occupied loans, at lower of cost or fair value	0	17,251
Total commercial loans held for sale	0	72,934
Home equity conversion mortgages, at lower of cost or fair value	507	643
Residential mortgage loans, at fair value	15,747	5,509
Total consumer loans held for sale	16,254	6,152
Loans held for sale	16,254	79,086
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for sale	16,254	79,086
Nonperforming
Receivables Held-for-sale [Abstract]
Loans held for sale	500	18,500
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for sale	$ 500	$ 18,500

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- Definition

Commercial & Industrial Loans, Held-for-Sale

+ References

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- Definition

Commercial Mortgage Loans, Held-for-Sale

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- Definition

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

+ References

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- Definition

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

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- Definition

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

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- Definition

Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

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