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Loans, Allowance for Credit Losses, and Asset Quality Information (Summary of Nonperforming Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	$ 32,993	$ 35,076
Loans	4,782,064	4,731,315	$ 4,770,063
Foreclosed properties	826	2,424
Nonperforming assets
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	32,993	35,076
TDRs - accruing	8,026	9,497
Accruing loans > 90 days past due	0	0
Loans	41,019	44,573
Foreclosed properties	826	2,424
Total nonperforming assets	$ 41,845	$ 46,997

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