Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amortized Cost:
Servicing Asset at Fair Value, Amount	$ 45,700		$ 45,700
Mortgages [Member]
Amortized Cost:
Valuation Allowance for Impairment of Recognized Servicing Assets, Period Increase (Decrease)			0	$ 0
Residential Mortgage [Member]
Amortized Cost:
Balance at beginning of period	41,803	$ 41,668	42,148	42,452
Originations of mortgage servicing rights	1,956	1,236	3,513	2,351
Amortization	(2,161)	(318)	(4,063)	(2,217)
Balance at end of period	$ 41,598	$ 42,586	$ 41,598	$ 42,586