Loans Purchased credit impaired loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Purchased credit impaired loans
Outstanding balance of purchased credit impaired loans	$ 2,277	$ 1,571
Carrying amount of purchased credit impaired loans	1,875	1,095
Commercial real estate
Purchased credit impaired loans
Outstanding balance of purchased credit impaired loans	963	39
Commercial and industrial
Purchased credit impaired loans
Outstanding balance of purchased credit impaired loans	78	0
Residential real estate
Purchased credit impaired loans
Outstanding balance of purchased credit impaired loans	1,236	1,524
Consumer
Purchased credit impaired loans
Outstanding balance of purchased credit impaired loans	$ 0	$ 8