Mortgage Servicing Rights (Details 2) (MSR, USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
MSR
Sensitivity analysis
Constant prepayment rate: Impact of 10% adverse change	$ (1,763,000)		$ (1,648,000)
Constant prepayment rate: Impact of 20% adverse change	(3,384,000)		(3,169,000)
Discount rate: Impact of 100 basis point adverse change	(1,173,000)		(1,431,000)
Discount rate: Impact of 200 basis point adverse change	(2,261,000)		(2,753,000)
Contractually specified servicing fees, late fees and ancillary fees	$ 4,200,000	$ 2,200,000