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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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