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, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 74,502	$ 108,455	$ 77,491
Impaired Financing Receivable, Average Recorded Investment		92,294	57,768
Impaired Financing Receivable, Interest Income, Cash Basis Method	2,770	2,879	1,893
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		28,836	33,088
Impaired Financing Receivable, Average Recorded Investment		30,280	21,415
Impaired Financing Receivable, Interest Income, Cash Basis Method		735	527
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		70,357	41,791
Impaired Financing Receivable, Average Recorded Investment		55,279	32,132
Impaired Financing Receivable, Interest Income, Cash Basis Method		1,890	1,241
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		3,110	453
Impaired Financing Receivable, Average Recorded Investment		1,291	1,987
Impaired Financing Receivable, Interest Income, Cash Basis Method	39	50	26
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		4,557	2,025
Impaired Financing Receivable, Average Recorded Investment		4,329	2,175
Impaired Financing Receivable, Interest Income, Cash Basis Method	204	204	99
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		1,595	134
Impaired Financing Receivable, Average Recorded Investment		$ 1,115	$ 59
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 73