Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Residential Mortgage Repurchase Reserve (Details) (Mortgage Repurchase Reserve [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mortgage Repurchase Reserve [Member]
Residential mortgage repurchase reserve
Balance at beginning of period	$ 5,737	$ 3,300
Repurchase provision expense	505	1,243
Adjustments to provision expense	(2,250)	4,666
Charge offs	(734)	(3,472)
Balance at end of period	$ 3,258	$ 5,737