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Loans, Allowance for Credit Losses, and Asset Quality Information (Summary of Nonperforming Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	$ 31,268	$ 35,076
Loans	4,869,841	4,731,315	$ 4,813,736
Foreclosed properties	1,819	2,424
Nonperforming assets
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	31,268	35,076
TDRs - accruing	7,600	9,497
Accruing loans > 90 days past due	0	0
Loans	38,868	44,573
Foreclosed properties	1,819	2,424
Total nonperforming assets	$ 40,687	$ 46,997

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