Loans Receivable and Allowance for Loan Losses (TDR Mortgage Loans Receivable) (Details) - Mortgage loans (gross) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	17	16	45	51
Pre-modification recorded investment	$ 4,514	$ 8,324	$ 16,202	$ 21,230
Recorded investment	$ 4,457	$ 7,933	$ 15,927	$ 20,109
Residential Mortgage Loans | Full documentation interest-only
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	4	3	12	21
Pre-modification recorded investment	$ 1,270	$ 1,447	$ 4,620	$ 9,244
Recorded investment	$ 1,239	$ 1,447	$ 4,505	$ 8,776
Residential Mortgage Loans | Full documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	6	0	17	3
Pre-modification recorded investment	$ 1,156	$ 0	$ 4,357	$ 519
Recorded investment	$ 1,138	$ 0	$ 4,241	$ 485
Residential Mortgage Loans | Reduced documentation interest-only
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	4	9	9	17
Pre-modification recorded investment	$ 1,324	$ 3,585	$ 3,220	$ 5,885
Recorded investment	$ 1,323	$ 3,581	$ 3,233	$ 5,860
Residential Mortgage Loans | Reduced documentation amortizing
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	3	1	5	3
Pre-modification recorded investment	$ 764	$ 282	$ 1,103	$ 599
Recorded investment	$ 757	$ 281	$ 1,099	$ 541
Multi-family
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	0	2	0	4
Pre-modification recorded investment	$ 0	$ 1,441	$ 0	$ 2,501
Recorded investment	$ 0	$ 1,055	$ 0	$ 1,994
Commercial real estate
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	0	1	2	3
Pre-modification recorded investment	$ 0	$ 1,569	$ 2,902	$ 2,482
Recorded investment	$ 0	$ 1,569	$ 2,849	$ 2,453