Fair Values of Assets and Liabilities (Unobservable Inputs Reconciliations) (Details) (Recurring [Member], Level 3 [Member], Mortgage servicing rights [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Recurring [Member] | Level 3 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 726	$ 0
Total gains or losses (realized/unrealized) included in earnings	348	0
Ending balance	$ 1,028	$ 0