Loans Receivable and Allowance for Loan Losses (Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Loans receivable and allowance for loan losses
Balance at the beginning of the period	$ 118,600	$ 143,900	$ 139,000	$ 145,501
Provision (credited) charged to operations	(3,042)	2,541	(7,153)	16,193
Charge-offs	(4,904)	(6,496)	(27,370)	(27,954)
Recoveries	2,946	3,055	9,123	9,260
Balance at the end of the period	113,600	143,000	113,600	143,000
Consumer and Other Loans
Loans receivable and allowance for loan losses
Balance at the beginning of the period	9,540	7,605	8,824	6,316
Provision (credited) charged to operations	147	(5)	2,097	2,196
Charge-offs	(352)	(544)	(1,776)	(1,672)
Recoveries	91	271	281	487
Balance at the end of the period	9,426	7,327	9,426	7,327
Mortgage loans (gross) | Residential
Loans receivable and allowance for loan losses
Balance at the beginning of the period	56,552	78,788	80,337	89,267
Provision (credited) charged to operations	(7,617)	7,659	(20,225)	7,488
Charge-offs	(2,134)	(5,560)	(19,061)	(20,332)
Recoveries	2,531	2,537	8,281	7,001
Balance at the end of the period	49,332	83,424	49,332	83,424
Mortgage loans (gross) | Multi-family
Loans receivable and allowance for loan losses
Balance at the beginning of the period	37,075	40,865	36,703	35,514
Provision (credited) charged to operations	3,183	(2,521)	4,457	5,131
Charge-offs	(2,275)	(99)	(3,414)	(3,637)
Recoveries	324		561	1,237
Balance at the end of the period	38,307	38,245	38,307	38,245
Mortgage loans (gross) | Commercial real estate
Loans receivable and allowance for loan losses
Balance at the beginning of the period	15,433	16,642	13,136	14,404
Provision (credited) charged to operations	1,245	(2,592)	6,518	1,378
Charge-offs	(143)	(293)	(3,119)	(2,313)
Recoveries		247		535
Balance at the end of the period	$ 16,535	$ 14,004	$ 16,535	$ 14,004