Mortgage Servicing Rights (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 MSRs	Sep. 30, 2012 MSRs	Sep. 30, 2013 MSRs	Sep. 30, 2012 MSRs
Activity in MSRs carried at fair value
Balance at beginning of period	$ 26,768	$ 19,798	$ 23,070	$ 23,449	$ 19,798	$ 25,698
Additions - servicing resulting from MSR purchases			1,116		5,124
Additions - servicing resulting from loan sales			4,157	30	4,177	772
Sales					(550)
Change in fair value:
Due to changes in valuation inputs or assumptions used in valuation model			(635)	(882)	1,233	(1,218)
Other changes in fair value			(940)	(1,357)	(3,014)	(4,012)
Total change in fair value			(1,575)	(2,239)	(1,781)	(5,230)
Balance at end of period	$ 26,768	$ 19,798	$ 26,768	$ 21,240	$ 26,768	$ 21,240