Loans Receivable And Allowance For Loan Losses (Summary Of Impaired Loans Receivable By Class) (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 123,797,000	$ 109,881,000
Recorded Investment	115,517,000	103,249,000
Related Allowance	8,578,000	9,326,000
Average Recorded Investment	117,140,000	108,059,000
Interest Income Recognized	1,171,000	2,005,000
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	14,737,000	11,022,000
Recorded Investment	13,019,000	10,235,000
Related Allowance	1,207,000	1,056,000
Average Recorded Investment	12,800,000	10,929,000
Interest Income Recognized	218,000	238,000
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	55,338,000	55,963,000
Recorded Investment	53,944,000	55,022,000
Related Allowance	3,017,000	4,304,000
Average Recorded Investment	54,143,000	56,017,000
Interest Income Recognized	576,000	1,213,000
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance
Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	11,410,000	11,410,000
Recorded Investment	10,757,000	11,018,000
Related Allowance
Average Recorded Investment	10,870,000	11,254,000
Interest Income Recognized		258,000
Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	81,485,000	78,395,000
Recorded Investment	77,720,000	76,275,000
Related Allowance	4,224,000	5,360,000
Average Recorded Investment	77,813,000	78,200,000
Interest Income Recognized	794,000	1,709,000
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	41,299,000	31,486,000
Recorded Investment	36,843,000	26,974,000
Related Allowance	4,305,000	3,966,000
Average Recorded Investment	38,307,000	29,859,000
Interest Income Recognized	362,000	296,000
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,013,000
Recorded Investment	954,000
Related Allowance	49,000
Average Recorded Investment	1,020,000
Interest Income Recognized	15,000
With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	44,772,000	28,165,000
Recorded Investment	38,686,000	25,983,000
Related Allowance
Average Recorded Investment	39,655,000	28,676,000
Interest Income Recognized	148,000	714,000
With No Related Allowance [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,402,000	3,341,000
Recorded Investment	4,380,000	2,793,000
Related Allowance
Average Recorded Investment	4,418,000	3,285,000
Interest Income Recognized	66,000	51,000
With No Related Allowance [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	17,660,000	8,432,000
Recorded Investment	16,715,000	7,521,000
Related Allowance
Average Recorded Investment	16,725,000	7,915,000
Interest Income Recognized	82,000	146,000
With No Related Allowance [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance
Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized
With No Related Allowance [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	11,410,000	11,410,000
Recorded Investment	10,757,000	11,018,000
Related Allowance
Average Recorded Investment	10,870,000	11,254,000
Interest Income Recognized		258,000
With No Related Allowance [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	34,472,000	23,183,000
Recorded Investment	31,852,000	21,332,000
Related Allowance
Average Recorded Investment	32,013,000	22,454,000
Interest Income Recognized	148,000	455,000
With No Related Allowance [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10,257,000	4,982,000
Recorded Investment	6,812,000	4,651,000
Related Allowance
Average Recorded Investment	7,595,000	6,222,000
Interest Income Recognized		259,000
With No Related Allowance [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	43,000
Recorded Investment	22,000
Related Allowance
Average Recorded Investment	47,000
Interest Income Recognized
With Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	79,025,000	81,716,000
Recorded Investment	76,831,000	77,266,000
Related Allowance	8,578,000	9,326,000
Average Recorded Investment	77,485,000	79,383,000
Interest Income Recognized	1,023,000	1,291,000
With Allowance Recorded [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9,335,000	7,681,000
Recorded Investment	8,639,000	7,442,000
Related Allowance	1,207,000	1,056,000
Average Recorded Investment	8,382,000	7,644,000
Interest Income Recognized	152,000	187,000
With Allowance Recorded [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	37,678,000	47,531,000
Recorded Investment	37,229,000	47,501,000
Related Allowance	3,017,000	4,304,000
Average Recorded Investment	37,418,000	48,102,000
Interest Income Recognized	494,000	1,067,000
With Allowance Recorded [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance
Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized
With Allowance Recorded [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance
Recorded Investment
Related Allowance
Average Recorded Investment
Interest Income Recognized
With Allowance Recorded [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	47,013,000	55,212,000
Recorded Investment	45,868,000	54,943,000
Related Allowance	4,224,000	5,360,000
Average Recorded Investment	45,800,000	55,746,000
Interest Income Recognized	646,000	1,254,000
With Allowance Recorded [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	31,042,000	26,504,000
Recorded Investment	30,031,000	22,323,000
Related Allowance	4,305,000	3,966,000
Average Recorded Investment	30,712,000	23,637,000
Interest Income Recognized	362,000	37,000
With Allowance Recorded [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	970,000
Recorded Investment	932,000
Related Allowance	49,000
Average Recorded Investment	973,000
Interest Income Recognized	$ 15,000