Loans Receivable and Allowance for Loan Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 7,029,667	$ 7,004,308
Premiums on purchased loans	4,229	4,968
Unearned discounts	(36)	(39)
Net deferred fees	(6,799)	(7,023)
Total loans	7,028,052	7,003,486
Purchased credit-impaired (PCI) loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	991	1,272
Mortgage Portfolio Segment [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	4,839,563	4,857,109
Mortgage Portfolio Segment [Member] \| Residential [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,157,311	1,211,672
Mortgage Portfolio Segment [Member] \| Commercial [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,022,576	1,978,569
Mortgage Portfolio Segment [Member] \| Multi-Family [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,334,984	1,402,054
Mortgage Portfolio Segment [Member] \| Construction [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	324,692	264,814
Commercial Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,708,842	1,630,444
Consumer Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 481,262	$ 516,755

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

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=82891408&loc=d3e4519-111522

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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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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=82891408&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=84173941&loc=d3e5074-111524

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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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