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Loans - Schedule of composition of loan portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 7,476,221 | $ 7,141,891 |  |
Financing Receivable, Allowance for Credit Loss | (83,745) | (85,379) | $ (83,197) | $ (85,675)
Net loans | 7,392,476 | 7,056,512 |  |
commercial financial agricultural less PPP and overdraft |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,292,025 | 1,295,238 |  |
PPP loans receivable |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 2,116 | 4,206 |  |
Bank Overdrafts |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,499 | 1,489 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,875,993 | 1,794,054 |  |
Construction Real Estate Remaining Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 209,226 | 208,982 |  |
Construction Real Estate Retail |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 95,873 | 116,433 |  |
Residential Real Estate Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 609,410 | 550,183 |  |
Residential Real Estate Mortgage [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,239,861 | 1,075,446 |  |
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 174,349 | 167,151 |  |
Residential Real Estate Installment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 5,904 | 4,091 |  |
consumer less GFSC and check loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,943,869 | 1,902,831 |  |
Check Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | 2,067 | 2,150 |  |
Finance Leases Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 24,029 | $ 19,637 |  |

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