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Allowance for Loan and Lease Losses - Changes in Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Movement in allowance for Loan and Lease Losses:                      
Total allowance at beginning of year       $ 43,410       $ 39,771 $ 43,410 $ 39,771 $ 35,755
Provisions charged to operations $ (1,000) $ 1,320 $ 601 $ 445 $ 2,058 $ 272 $ 1,045 $ 567 1,366 3,942 4,161
Recoveries on loans and leases                 906 2,137 2,429
Charge-offs on loans and leases                 (5,790) (2,440) (2,574)
Total allowance at end of year $ 39,892       $ 43,410       $ 39,892 $ 43,410 $ 39,771