Loans Receivable and Allowance for Loan Losses (Schedule of Summarized Loans Receivable) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	$ 6,121,844	$ 6,082,377
Purchased credit-impaired (PCI) loans	4,285	4,510
Premiums on purchased loans	5,386	5,307
Unearned discounts	(47)	(53)
Net deferred fees	(6,769)	(6,636)
Total loans	6,124,699	6,085,505
Commercial Loan [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,242,565	1,262,422
Consumer Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	601,190	611,467
Mortgage Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	4,278,089	4,208,488
Mortgage Loans [Member] \| Residential [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,245,711	1,251,445
Mortgage Loans [Member] \| Commercial [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,688,083	1,694,359
Mortgage Loans [Member] \| Multi-Family [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,070,294	1,041,582
Mortgage Loans [Member] \| Construction [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	$ 274,001	$ 221,102

The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.

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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.

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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).

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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.

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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.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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