Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) SecurityLoan security	Mar. 31, 2018 USD ($) SecurityLoan security
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	5	5
Pre-Modification Outstanding Recorded Investment	$ 16,023	$ 8,127
Post-Modification Outstanding Recorded Investment	$ 16,023	$ 6,626
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	1	0
Pre-Modification Outstanding Recorded Investment	$ 14,010	$ 0
Post-Modification Outstanding Recorded Investment	$ 14,010	$ 0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| security	4	5
Pre-Modification Outstanding Recorded Investment	$ 2,013	$ 8,127
Post-Modification Outstanding Recorded Investment	$ 2,013	$ 6,626
Commercial [Member] \| Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	1	0
Pre-Modification Outstanding Recorded Investment	$ 14,010	$ 0
Post-Modification Outstanding Recorded Investment	$ 14,010	$ 0

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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