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