Loans Receivable and Allowance for Credit Losses on Loans (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) counterparty	Mar. 31, 2019 USD ($) counterparty
Mortgage Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 14,010
Post-Modification Outstanding Recorded Investment	$ 0	$ 14,010
Mortgage Portfolio \| Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 14,010
Post-Modification Outstanding Recorded Investment	$ 0	$ 14,010
Restructured Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	2	5
Pre-Modification Outstanding Recorded Investment	$ 746	$ 16,023
Post-Modification Outstanding Recorded Investment	$ 731	$ 16,023
Restructured Loans \| Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	2	4
Pre-Modification Outstanding Recorded Investment	$ 746	$ 2,013
Post-Modification Outstanding Recorded Investment	$ 731	$ 2,013

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.

No definition available.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

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