Loans Receivable and Allowance for Loan Losses (TDR Mortgage Loans, Subsequent Payment Default) (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 loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	16	7	18	12
Recorded Investment	$ 5,418	$ 2,476	$ 6,055	$ 3,802
Residential Mortgage Loans | Full documentation interest-only
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	6	2	6	3
Recorded Investment	$ 2,244	$ 714	$ 2,244	$ 854
Residential Mortgage Loans | Full documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	5	3	5	4
Recorded Investment	$ 1,687	$ 852	$ 1,687	$ 1,057
Residential Mortgage Loans | Reduced documentation interest-only
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	2	2	4	4
Recorded Investment	$ 758	$ 910	$ 1,395	$ 1,799
Residential Mortgage Loans | Reduced documentation amortizing
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans | loan	3	0	3	1
Recorded Investment	$ 729	$ 0	$ 729	$ 92