Loans Receivable and Allowance for Loan Losses (TDR Mortgage Loans Receivable) (Details) (Mortgage loans (gross), USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	16	23
Pre-modification recorded investment	$ 8,683	$ 8,727
Recorded investment	8,611	8,132
Residential Mortgage Loans | Full documentation interest-only
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	4	9
Pre-modification recorded investment	2,035	4,083
Recorded investment	2,030	3,691
Residential Mortgage Loans | Full documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	6	5
Pre-modification recorded investment	2,059	1,509
Recorded investment	2,016	1,481
Residential Mortgage Loans | Reduced documentation interest-only
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	4	4
Pre-modification recorded investment	1,687	1,099
Recorded investment	1,687	1,097
Residential Mortgage Loans | Reduced documentation amortizing
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	0	2
Pre-modification recorded investment	0	317
Recorded investment	0	264
Multi-family
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	0	2
Pre-modification recorded investment	0	1,060
Recorded investment	0	952
Commercial real estate
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2	1
Pre-modification recorded investment	2,902	659
Recorded investment	$ 2,878	$ 647