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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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