Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Residential Mortgage Repurchase Reserve (Details) (Mortgage Repurchase Reserve [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Mortgage Repurchase Reserve [Member]
Residential mortgage repurchase reserve
Balance at beginning of period	$ 3,258	$ 5,737
Repurchase provision expense	128	505
Adjustments to provision expense	(950)	(2,250)
(Charge offs) recoveries	45	(734)
Balance at end of period	$ 2,481	$ 3,258