Commitments, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss
Cumulative effect of ASU 2016-13 adoption (CECL)	$ 39,776	$ 47,776		$ 21,907
Provision for credit losses	(8,000)	7,000
First Staunton Bancshares
Financing Receivable, Allowance for Credit Loss
Provision for credit losses	$ 0	179
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss
Cumulative effect of ASU 2016-13 adoption (CECL)			$ 18,690
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Loss
Cumulative effect of ASU 2016-13 adoption (CECL)		$ 47,776	$ 40,597