Allowance for Loan and Lease Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Movement in allowance for Loan and Lease Losses:                      
Beginning balance       $ 24,643       $ 27,593 $ 24,643 $ 27,593 $ 27,832
Provision charged to operations 585 2,049 2,489 1,038 5,659 1,042 1,011 1,125 6,161 8,837 8,945
Recoveries on loans and leases                 5,347 734 1,048
Charge-offs on loans and leases                 (8,181) (12,521) (10,232)
Ending Balance $ 27,970       $ 24,643       $ 27,970 $ 24,643 $ 27,593