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Loans (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid principal balance |  |  |  |  | $ 109,062
Recorded investment | $ 79,264 | $ 116,180 | $ 79,264 | $ 116,180 | 108,455
Allowance for loan losses allocated |  |  |  |  | 5,434
Average recorded investment |  | 96,028 |  | 86,828 |
Interest income recognized | 694 | 756 | 2,236 | 2,139 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  | 6,890
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  | 6,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 63,639
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 63,467
Commercial Financial And Agricultural [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 33,098 |  | 33,098 |
Allowance for loan losses allocated |  |  |  |  | 3,758
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  | 5,881
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  | 5,866
Average recorded investment |  | 29,481 |  | 30,426 |
Interest income recognized |  | 159 |  | 543 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 23,316
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 22,970
Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 3,142 |  | 3,142 |
Allowance for loan losses allocated |  |  |  |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  | 0
Average recorded investment |  | 1,212 |  | 743 |
Interest income recognized | 1 | 6 | 38 | 14 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 3,110
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 3,110
Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 4,897 |  | 4,897 |
Allowance for loan losses allocated |  |  |  |  | 16
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  | 109
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  | 109
Average recorded investment |  | 5,061 |  | 4,271 |
Interest income recognized | 60 | 65 | 180 | 166 |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 4,522
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | 4,448
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 72,519 |  | 72,519 |
Allowance for loan losses allocated |  |  |  |  | 1,316
Average recorded investment |  | 58,195 |  | 50,479 |
Interest income recognized | 458 | 526 | 1,480 | 1,416 |
Finance Leases Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 2,524 |  | 2,524 |
Allowance for loan losses allocated |  |  |  |  | 344
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  | 1,027
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  | 1,027
Average recorded investment |  | $ 2,079 |  | $ 909 |
Interest income recognized | $ 17 |  | $ 61 |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  | 568
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  | $ 568

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