Loans Receivable And Allowance For Loan Losses (Summary Of Aging Loans Receivable By Portfolio Segment And Class) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	$ 20,272	$ 24,721
60-89 Days	8,210	11,525
Non-accrual	115,217	122,549
Total Past Due and Non-accrual	143,699	158,795
Current	4,589,923	4,492,325
Total	4,733,622	4,651,120
Recorded Investment > 90 days accruing
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	1,037	2,472
60-89 Days	1,428	526
Non-accrual	31,489	32,093
Total Past Due and Non-accrual	33,954	35,091
Current	820,303	813,918
Total	854,257	849,009
Recorded Investment > 90 days accruing
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	3,653	5,276
60-89 Days	2,028	1,908
Non-accrual	6,899	8,533
Total Past Due and Non-accrual	12,580	15,717
Current	563,711	545,253
Total	576,291	560,970
Recorded Investment > 90 days accruing
Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	15,582	16,973
60-89 Days	4,754	9,091
Non-accrual	76,829	81,923
Total Past Due and Non-accrual	97,165	107,987
Current	3,205,909	3,133,154
Total	3,303,074	3,241,141
Recorded Investment > 90 days accruing
Mortgage Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	14,885	16,034
60-89 Days	4,504	7,936
Non-accrual	34,207	40,386
Total Past Due and Non-accrual	53,596	64,356
Current	1,253,982	1,244,279
Total	1,307,578	1,308,635
Recorded Investment > 90 days accruing
Mortgage Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	375	939
60-89 Days	215	1,155
Non-accrual	31,865	29,522
Total Past Due and Non-accrual	32,455	31,616
Current	1,244,887	1,221,926
Total	1,277,342	1,253,542
Recorded Investment > 90 days accruing
Mortgage Loans [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
60-89 Days	35
Non-accrual		997
Total Past Due and Non-accrual	35	997
Current	598,441	563,150
Total	598,476	564,147
Recorded Investment > 90 days accruing
Mortgage Loans [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	322
Non-accrual	10,757	11,018
Total Past Due and Non-accrual	11,079	11,018
Current	108,599	103,799
Total	119,678	114,817
Recorded Investment > 90 days accruing