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Loans (Aging of past due loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	$ 26,651	$ 22,686
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	25,797	22,162
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	7,817,128	7,476,221
Financing Receivable, 90 Days or More Past Due, Still Accruing	1,754	859
impaired financing receivable recorded investment nonaccrual loans which are current in contractual P and I payments	44,100	39,000
commercial financial agricultural less PPP and overdraft
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	1,881	522
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	13,234	11,629
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,267,263	1,292,025
PPP Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	20	9
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	847	2,116
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Bank Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	0	0
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,475	1,499
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	458	1,656
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	2,594	1,839
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,994,332	1,875,993
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	0	0
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	0	205
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	311,122	209,226
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	100	554
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	22	26
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	101,455	95,873
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	26
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	0	295
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	2,164	219
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	644,418	609,410
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Residential Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	13,403	9,831
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	5,946	6,450
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,346,543	1,239,861
Financing Receivable, 90 Days or More Past Due, Still Accruing	913	206
Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	438	788
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	620	611
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	203,459	174,349
Financing Receivable, 90 Days or More Past Due, Still Accruing	15	0
Residential Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	39	52
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	22	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	6,013	5,904
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	10,309	8,974
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	1,195	1,183
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,908,473	1,943,869
Check Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	3	5
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,899	2,067
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Accruing Loans 30 to 89 Days Past Due	0	0
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	29,829	24,029
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,292,025
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	14
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,994,332	1,875,993
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,569,317	3,463,422
Financing Receivable, 90 Days or More Past Due, Still Accruing	826	613
Financial Asset, Past Due
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	52,448	44,848
Financial Asset, Past Due | commercial financial agricultural less PPP and overdraft
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	15,115	12,151
Financial Asset, Past Due | PPP Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	20	9
Financial Asset, Past Due | Bank Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,052	3,495
Financial Asset, Past Due | Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	205
Financial Asset, Past Due | Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	122	580
Financial Asset, Past Due | Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,164	514
Financial Asset, Past Due | Residential Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	19,349	16,281
Financial Asset, Past Due | Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,058	1,399
Financial Asset, Past Due | Residential Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	61	52
Financial Asset, Past Due | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	11,504	10,157
Financial Asset, Past Due | Check Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3	5
Financial Asset, Past Due | Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Financial Asset, Not Past Due
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	7,764,680	7,431,373
Financial Asset, Not Past Due | commercial financial agricultural less PPP and overdraft
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,252,148	1,279,874
Financial Asset, Not Past Due | PPP Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	827	2,107
Financial Asset, Not Past Due | Bank Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,475	1,499
Financial Asset, Not Past Due | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,991,280	1,872,498
Financial Asset, Not Past Due | Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	311,122	209,021
Financial Asset, Not Past Due | Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	101,333	95,293
Financial Asset, Not Past Due | Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	642,254	608,896
Financial Asset, Not Past Due | Residential Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,327,194	1,223,580
Financial Asset, Not Past Due | Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	202,401	172,950
Financial Asset, Not Past Due | Residential Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	5,952	5,852
Financial Asset, Not Past Due | Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,896,969	1,933,712
Financial Asset, Not Past Due | Check Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,896	2,062
Financial Asset, Not Past Due | Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 29,829	$ 24,029

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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