Loans Receivable and Allowance for Credit Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($) counterparty	Jun. 30, 2019 USD ($) counterparty	Jun. 30, 2020 USD ($) counterparty	Jun. 30, 2019 USD ($) counterparty
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	3	6	5	10
Pre-Modification Outstanding Recorded Investment	$ 1,078	$ 2,239	$ 1,825	$ 17,461
Post-Modification Outstanding Recorded Investment	$ 997	$ 2,198	$ 1,712	$ 17,292
Mortgage Portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	1	2	1	3
Pre-Modification Outstanding Recorded Investment	$ 342	$ 749	$ 342	$ 14,759
Post-Modification Outstanding Recorded Investment	$ 283	$ 718	$ 283	$ 14,728
Mortgage Portfolio \| Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	1	2	1	2
Pre-Modification Outstanding Recorded Investment	$ 342	$ 749	$ 342	$ 749
Post-Modification Outstanding Recorded Investment	$ 283	$ 718	$ 283	$ 718
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
Commercial Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| counterparty	2	4	4	7
Pre-Modification Outstanding Recorded Investment	$ 736	$ 1,490	$ 1,483	$ 2,702
Post-Modification Outstanding Recorded Investment	$ 714	$ 1,480	$ 1,429	$ 2,564

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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=121611835&loc=SL6953676-111524

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

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

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