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Loans (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance |  |  | $ 109,062
Recorded investment | $ 100,407 | $ 85,851 | 108,455
Allowance for loan losses allocated |  |  | 5,434
Average recorded investment |  | 79,595 |
Interest income recognized | 784 | 712 |
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 |  | 29,542 |
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 |  | 31,657 |
Interest income recognized |  | 204 |
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 |  | 452 |
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 |  | 424 |
Interest income recognized | 33 | 4 |
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 |  | 5,581 |
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 |  | 2,925 |
Interest income recognized | 46 | 23 |
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 |  | 50,147 |
Allowance for loan losses allocated |  |  | 1,316
Average recorded investment |  | 44,457 |
Interest income recognized | 515 | 481 |
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment |  | 129 |
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 |  | $ 132 |
Interest income recognized | $ 20 |  |
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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