Loans Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 78,341	$ 74,502	$ 108,455
Impaired Financing Receivable, Average Recorded Investment			92,294
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,795	2,770	2,879
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			28,836
Impaired Financing Receivable, Average Recorded Investment			30,280
Impaired Financing Receivable, Interest Income, Cash Basis Method			735
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			70,357
Impaired Financing Receivable, Average Recorded Investment			55,279
Impaired Financing Receivable, Interest Income, Cash Basis Method			1,890
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			3,110
Impaired Financing Receivable, Average Recorded Investment			1,291
Impaired Financing Receivable, Interest Income, Cash Basis Method	32	39	50
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			4,557
Impaired Financing Receivable, Average Recorded Investment			4,329
Impaired Financing Receivable, Interest Income, Cash Basis Method	88	204	204
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			1,595
Impaired Financing Receivable, Average Recorded Investment			$ 1,115
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 33	$ 73