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Loans (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid principal balance |  |  |  |  | $ 109,062
Recorded investment | $ 86,874 | $ 91,783 | $ 86,874 | $ 91,783 | 108,455
Allowance for loan losses allocated |  |  |  |  | 5,434
Average recorded investment |  | 85,857 |  | 82,279 |
Interest income recognized | 758 | 671 | 1,542 | 1,383 |
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 |  | 30,183 |  | 30,183 |
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 |  | 29,859 |  | 30,931 |
Interest income recognized |  | 180 |  | 384 |
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 |  | 631 |  | 631 |
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 |  | 493 |  | 460 |
Interest income recognized | 4 | 4 | 37 | 8 |
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 |  | 5,257 |  | 5,257 |
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 |  | 5,400 |  | 3,960 |
Interest income recognized | 74 | 78 | 120 | 101 |
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 |  | 54,071 |  | 54,071 |
Allowance for loan losses allocated |  |  |  |  | 1,316
Average recorded investment |  | 49,599 |  | 46,582 |
Interest income recognized | 507 | 409 | 1,022 | 890 |
Finance Leases Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment |  | 1,641 |  | 1,641 |
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 |  | $ 506 |  | $ 346 |
Interest income recognized | $ 24 |  | $ 44 |  |
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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