Loans Receivable and Allowance for Loan Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	$ 17,833	$ 13,665
60-89 Days	7,162	7,241
Non-accrual	50,888	53,855
Total Past Due and Non-accrual	75,883	74,761
Current	6,045,961	6,007,616
Loans and Leases Receivable, Gross	6,121,844	6,082,377
Total Loans Receivable	6,121,844	6,082,377
Recorded Investment 90 days accruing	0	0
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	3,352	1,000
60-89 Days	18	371
Non-accrual	12,035	12,342
Total Past Due and Non-accrual	15,405	13,713
Current	1,227,160	1,248,709
Loans and Leases Receivable, Gross	1,242,565	1,262,422
Total Loans Receivable	1,242,565	1,262,422
Recorded Investment 90 days accruing	0	0
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	3,599	2,398
60-89 Days	1,020	2,509
Non-accrual	3,415	3,944
Total Past Due and Non-accrual	8,034	8,851
Current	593,156	602,616
Loans and Leases Receivable, Gross	601,190	611,467
Total Loans Receivable		611,467
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	10,882	10,267
60-89 Days	6,124	4,361
Non-accrual	35,438	37,569
Total Past Due and Non-accrual	52,444	52,197
Current	4,225,645	4,156,291
Loans and Leases Receivable, Gross	4,278,089	4,208,488
Total Loans Receivable	4,278,089	4,208,488
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] \| Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	8,871	10,121
60-89 Days	5,832	4,331
Non-accrual	16,913	17,222
Total Past Due and Non-accrual	31,616	31,674
Current	1,214,095	1,219,771
Loans and Leases Receivable, Gross	1,245,711	1,251,445
Total Loans Receivable		1,251,445
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	1,485	146
60-89 Days	292	30
Non-accrual	18,203	20,026
Total Past Due and Non-accrual	19,980	20,202
Current	1,668,103	1,674,157
Loans and Leases Receivable, Gross	1,688,083	1,694,359
Total Loans Receivable		1,694,359
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] \| Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	526	0
60-89 Days	0	0
Non-accrual	322	321
Total Past Due and Non-accrual	848	321
Current	1,069,446	1,041,261
Loans and Leases Receivable, Gross	1,070,294	1,041,582
Total Loans Receivable		1,041,582
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	0	0
60-89 Days	0	0
Non-accrual	0	0
Total Past Due and Non-accrual	0	0
Current	274,001	221,102
Loans and Leases Receivable, Gross	274,001	221,102
Total Loans Receivable		221,102
Recorded Investment 90 days accruing	$ 0	$ 0

Financing receivable recorded investment past due And Non-Accruing

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Financing receivables that are current.

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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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

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=28367877&loc=d3e4428-111522

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of other loans and leases not otherwise specified in the taxonomy. 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 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

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-Publisher FASB

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