Loans Receivable and Allowance for Loan Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Servicing Liability at Amortized Cost [Line Items]
Total mortgage loans	$ 4,798,893	$ 4,534,400
Total gross loans	6,890,560	6,534,022
Purchased credit-impaired (PCI) loans	1,691	3,435
Premiums on purchased loans	5,330	5,740
Unearned discounts	(39)	(41)
Net deferred fees	(6,956)	(5,482)
Loans receivable	6,890,586	6,537,674
Residential [Member]
Servicing Liability at Amortized Cost [Line Items]
Total mortgage loans	1,213,507	1,254,036
Commercial [Member]
Servicing Liability at Amortized Cost [Line Items]
Total mortgage loans	1,884,155	1,714,923
Multi-Family [Member]
Servicing Liability at Amortized Cost [Line Items]
Total mortgage loans	1,384,428	1,233,792
Construction [Member]
Servicing Liability at Amortized Cost [Line Items]
Total mortgage loans	316,803	331,649
Commercial Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,553,606	1,433,447
Consumer Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 538,061	$ 566,175

Unamortized Loan Commitment and Origination Fees

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- Definition

Unamortized Loan Discounts or Premiums

+ References

No definition available.

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- Definition

The recorded amount of loans and debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it was probable, at acquisition, that the investor would be unable to collect all contractually required payments receivable, but which are not deemed to be impaired since the acquisition by transfer. Therefore, no allowance for credit losses is recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5275-111524

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- Definition

Unearned discounts (other than cash or quantity discounts and the like), finance charges, and interest included in the face amount of receivables, that are shown as a deduction from the related receivables. For example, 1) finance charges booked as a receivable when a loan is made and recognized as income at a later date; and 2) interest charges deducted from the face loan amount, resulting in a discounted amount actually advanced to the borrower (wherein the receivable includes the amount actually advanced to the borrower and the as yet unearned interest income).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4519-111522

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

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.

+ References

No definition available.

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