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Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in allowance for Loan and Lease Losses:                      
Total allowance at beginning of year       $ 32,004       $ 28,997 $ 32,004 $ 28,997 $ 27,970
Provision for loan and lease losses $ 1,706 $ 782 $ 978 $ 855 $ 1,533 $ 281 $ 922 $ 209 4,321 2,945 2,306
Recoveries on loans and leases                 2,139 2,843 3,109
Charge-offs on loans and leases                 (2,709) (2,781) (4,388)
Total allowance at end of year $ 35,755       $ 32,004       $ 35,755 $ 32,004 $ 28,997