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Allowance for Credit Losses - Aggregated analysis of the changes in allowance for loan losses Summary (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allowance for credit losses        
Balance at beginning of period $ 434,608 $ 58,213 $ 56,927 $ 55,798
Loans charged-off (4,642) (2,779) (10,296) (7,260)
Recoveries of loans previously charged off 4,048 884 8,287 2,833
Net charge-offs (594) (1,895) (2,009) (4,427)
Provision for loan losses charged to operations 7,687 4,028 71,957 9,220
Reduction due to loan removals   (91)   (336)
Balance at end of period $ 440,159 60,255 $ 440,159 60,255
Non-acquired loans        
Allowance for credit losses        
Balance at beginning of period   53,590   51,194
Loans charged-off   (1,969)   (4,541)
Recoveries of loans previously charged off   834   2,461
Net charge-offs   (1,135)   (2,080)
Provision for loan losses charged to operations   2,482   5,823
Balance at end of period   54,937   54,937
Acquired non-credit impaired loans        
Allowance for credit losses        
Loans charged-off   (810)   (2,719)
Recoveries of loans previously charged off   50   372
Net charge-offs   (760)   (2,347)
Provision for loan losses charged to operations   760   2,347
Acquired credit impaired loans        
Allowance for credit losses        
Balance at beginning of period   4,623   4,604
Provision for loan losses charged to operations   786   1,050
Reduction due to loan removals   (91)   (336)
Balance at end of period   $ 5,318   $ 5,318