Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			$ 47,776	$ 21,907	$ 21,907
Off-Balance Sheet, Credit Loss, Liability	$ 41,276		41,276		47,776
Provision for credit losses			(6,500)		7,000
Balance at end of period	41,276		41,276		47,776
Allowance for credit losses on loans
Provision for credit losses	(24,010)	$ 43,009	(82,018)	157,009
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			383,702
Balance at end of period	290,997		290,997		383,702
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total allowance for loan losses	290,997		290,997		383,702
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	23,621,673		23,621,673		24,451,724
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
PPP
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	182,121		182,121		767,757
Commercial and industrial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	7,927,459		7,927,459		7,701,422
Commercial real estate — owner occupied
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	879,554		879,554		900,912
Commercial and business lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	8,989,133		8,989,133		9,370,091
Commercial real estate — investor
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	4,296,489		4,296,489		4,342,584
Real estate construction
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	1,834,871		1,834,871		1,840,417
Commercial real estate lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	6,131,360		6,131,360		6,183,001
Total commercial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	15,120,493		15,120,493		15,553,091
Home equity
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	608,566		608,566		707,255
Auto
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	6,739		6,739		11,177
Total consumer
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	8,501,180		8,501,180		8,898,632
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			383,702	201,371	201,371
Financing Receivable, Allowance for Credit Loss	290,997		290,997		383,702
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Provision for credit losses			(75,500)		164,457
Balance at end of period	290,997		290,997		383,702
Allowance for credit losses on loans
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(31,784)		(112,053)
Net Charge offs			(17,205)		(100,631)
Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						313,828
Allowance for Loan Losses [Member] | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					2,543
Allowance for Loan Losses [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						112,457
Allowance for Loan Losses [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			531	0	0
Financing Receivable, Allowance for Credit Loss	125		125		531
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Provision for credit losses			(406)		531
Balance at end of period	125		125		531
Allowance for credit losses on loans
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0		0
Net Charge offs			0		0
Allowance for Loan Losses [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					0
Allowance for Loan Losses [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			142,793	91,133	91,133
Financing Receivable, Allowance for Credit Loss	89,111		89,111		142,793
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Provision for credit losses			(47,324)		71,355
Balance at end of period	89,111		89,111		142,793
Allowance for credit losses on loans
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(13,773)		(80,320)
Net Charge offs			(6,358)		(73,316)
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						144,052
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					408
Allowance for Loan Losses [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						52,919
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			11,274	10,284	10,284
Financing Receivable, Allowance for Credit Loss	12,022		12,022		11,274
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Provision for credit losses			634		1,967
Balance at end of period	12,022		12,022		11,274
Allowance for credit losses on loans
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0		(419)
Net Charge offs			115		(272)
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						8,433
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					255
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						(1,851)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			154,598	101,417	101,417
Financing Receivable, Allowance for Credit Loss	101,259		101,259		154,598
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Provision for credit losses			(47,096)		73,853
Balance at end of period	101,259		101,259		154,598
Allowance for credit losses on loans
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(13,773)		(80,739)
Net Charge offs			(6,242)		(73,588)
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						152,485
Allowance for Loan Losses [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					663
Allowance for Loan Losses [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,068
Allowance for Loan Losses [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			93,435	40,514	40,514
Financing Receivable, Allowance for Credit Loss	81,461		81,461		93,435
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Provision for credit losses			(680)		71,933
Balance at end of period	81,461		81,461		93,435
Allowance for credit losses on loans
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(14,340)		(22,920)
Net Charge offs			(11,293)		(22,277)
Allowance for Loan Losses [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						42,555
Allowance for Loan Losses [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					472
Allowance for Loan Losses [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						2,041
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			59,193	24,915	24,915
Financing Receivable, Allowance for Credit Loss	40,965		40,965		59,193
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Provision for credit losses			(18,298)		25,854
Balance at end of period	40,965		40,965		59,193
Allowance for credit losses on loans
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(5)		(19)
Net Charge offs			69		31
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						32,382
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					492
Allowance for Loan Losses [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,467
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			152,629	65,428	65,428
Financing Receivable, Allowance for Credit Loss	122,426		122,426		152,629
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Provision for credit losses			(18,978)		97,787
Balance at end of period	122,426		122,426		152,629
Allowance for credit losses on loans
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(14,344)		(22,938)
Net Charge offs			(11,224)		(22,246)
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						74,937
Allowance for Loan Losses [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					964
Allowance for Loan Losses [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						9,508
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			307,226	166,846	166,846
Financing Receivable, Allowance for Credit Loss	223,685		223,685		307,226
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Provision for credit losses			(66,074)		171,641
Balance at end of period	223,685		223,685		307,226
Allowance for credit losses on loans
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(28,117)		(103,677)
Net Charge offs			(17,467)		(95,834)
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						227,422
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					1,627
Allowance for Loan Losses [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						60,576
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			42,996	16,960	16,960
Financing Receivable, Allowance for Credit Loss	41,620		41,620		42,996
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Provision for credit losses			(1,344)		(6,864)
Balance at end of period	41,620		41,620		42,996
Allowance for credit losses on loans
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(732)		(1,867)
Net Charge offs			(32)		(1,367)
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						50,175
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					403
Allowance for Loan Losses [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						33,215
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			18,849	10,926	10,926
Financing Receivable, Allowance for Credit Loss	14,317		14,317		18,849
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Provision for credit losses			(6,172)		(4,781)
Balance at end of period	14,317		14,317		18,849
Allowance for credit losses on loans
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(600)		(1,719)
Net Charge offs			1,640		259
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						22,575
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					374
Allowance for Loan Losses [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						11,649
Allowance for Loan Losses [Member] | Other consumer(a)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			14,630	6,639	6,639
Financing Receivable, Allowance for Credit Loss					14,630
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Provision for credit losses					4,462
Balance at end of period					14,630
Allowance for credit losses on loans
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs					(4,790)
Net Charge offs					(3,689)
Allowance for Loan Losses [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						13,655
Allowance for Loan Losses [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					140
Allowance for Loan Losses [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,016
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			14,456
Financing Receivable, Allowance for Credit Loss	11,253		11,253		14,456
Recoveries			965
Net Charge offs			(1,366)
Provision for credit losses			(1,836)
Balance at end of period	11,253		11,253		14,456
Allowance for credit losses on loans
Recoveries			965
Net Charge offs			(1,366)
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(2,331)
Net Charge offs			(1,366)
Allowance for Loan Losses [Member] | Auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			174
Financing Receivable, Allowance for Credit Loss	120		120		174
Recoveries			24
Net Charge offs			20
Provision for credit losses			(74)
Balance at end of period	120		120		174
Allowance for credit losses on loans
Recoveries			24
Net Charge offs			20
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4)
Net Charge offs			20
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			76,475	34,525	34,525
Financing Receivable, Allowance for Credit Loss	67,311		67,311		76,475
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Provision for credit losses			(9,426)		(7,183)
Balance at end of period	67,311		67,311		76,475
Allowance for credit losses on loans
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(3,667)		(8,376)
Net Charge offs			262		(4,797)
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						86,405
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					917
Allowance for Loan Losses [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,880
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			47,776	21,907	21,907
Off-Balance Sheet, Credit Loss, Liability	41,276		41,276		47,776
Provision for credit losses			(6,500)		7,000
Balance at end of period	41,276		41,276		47,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						40,597
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					179
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			22,311	12,276	12,276
Off-Balance Sheet, Credit Loss, Liability	19,402		19,402		22,311
Provision for credit losses			(2,910)		13,972
Balance at end of period	19,402		19,402		22,311
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,278
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					61
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			266	127	127
Off-Balance Sheet, Credit Loss, Liability	309		309		266
Provision for credit losses			43		135
Balance at end of period	309		309		266
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					4
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			22,577	12,403	12,403
Off-Balance Sheet, Credit Loss, Liability	19,711		19,711		22,577
Provision for credit losses			(2,867)		14,108
Balance at end of period	19,711		19,711		22,577
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					65
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			636	530	530
Off-Balance Sheet, Credit Loss, Liability	721		721		636
Provision for credit losses			85		(141)
Balance at end of period	721		721		636
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					2
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						246
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			18,887	7,532	7,532
Off-Balance Sheet, Credit Loss, Liability	15,476		15,476		18,887
Provision for credit losses			(3,411)		(7,038)
Balance at end of period	15,476		15,476		18,887
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						25,879
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					45
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,347
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			19,523	8,062	8,062
Off-Balance Sheet, Credit Loss, Liability	16,197		16,197		19,523
Provision for credit losses			(3,326)		(7,179)
Balance at end of period	16,197		16,197		19,523
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						26,655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					47
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,593
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			42,101	20,465	20,465
Off-Balance Sheet, Credit Loss, Liability	35,908		35,908		42,101
Provision for credit losses			(6,193)		6,929
Balance at end of period	35,908		35,908		42,101
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						35,060
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					112
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						14,595
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			3,118	1,038	1,038
Off-Balance Sheet, Credit Loss, Liability	3,031		3,031		3,118
Provision for credit losses			(87)		(577)
Balance at end of period	3,031		3,031		3,118
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						3,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						2,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			2,557	405	405
Off-Balance Sheet, Credit Loss, Liability	2,337		2,337		2,557
Provision for credit losses			(220)		649
Balance at end of period	2,337		2,337		2,557
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,504
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			5,675	1,443	1,443
Off-Balance Sheet, Credit Loss, Liability	5,368		5,368		5,675
Provision for credit losses			(307)		72
Balance at end of period	5,368		5,368		5,675
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						5,538
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						4,095
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Allowance for credit losses on loans
Balance at beginning of period			431,478	223,278	223,278
Allowance for Credit Losses on Loans	332,273		332,273		431,478
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Provision for credit losses			(82,000)		171,457
Balance at end of period	$ 332,273		$ 332,273		$ 431,478
Percent of Loans	1.41%		1.41%		1.76%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (31,784)		$ (112,053)
Net Charge offs			(17,205)		(100,631)
Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						354,425
Allowance for Loans Losses and Unfunded Commitments [Member] | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					2,722
Allowance for Loans Losses and Unfunded Commitments [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						131,147
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Allowance for credit losses on loans
Balance at beginning of period			531	0	0
Allowance for Credit Losses on Loans	$ 125		125		531
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Provision for credit losses			(406)		531
Balance at end of period	$ 125		$ 125		$ 531
Percent of Loans	0.07%		0.07%		0.07%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ 0		$ 0
Net Charge offs			0		0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Allowance for credit losses on loans
Balance at beginning of period			165,105	103,409	103,409
Allowance for Credit Losses on Loans	$ 108,513		108,513		165,105
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Provision for credit losses			(50,233)		85,327
Balance at end of period	$ 108,513		$ 108,513		$ 165,105
Percent of Loans	1.37%		1.37%		2.14%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (13,773)		$ (80,320)
Net Charge offs			(6,358)		(73,316)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						152,330
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					469
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						48,921
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Allowance for credit losses on loans
Balance at beginning of period			11,539	10,411	10,411
Allowance for Credit Losses on Loans	$ 12,331		12,331		11,539
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Provision for credit losses			677		2,102
Balance at end of period	$ 12,331		$ 12,331		$ 11,539
Percent of Loans	1.40%		1.40%		1.28%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ 0		$ (419)
Net Charge offs			115		(272)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,560
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					259
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						(1,851)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Allowance for credit losses on loans
Balance at beginning of period			177,175	113,820	113,820
Allowance for Credit Losses on Loans	$ 120,970		120,970		177,175
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Provision for credit losses			(49,963)		87,961
Balance at end of period	$ 120,970		$ 120,970		$ 177,175
Percent of Loans	1.35%		1.35%		1.89%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (13,773)		$ (80,739)
Net Charge offs			(6,242)		(73,588)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						160,890
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					728
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						47,070
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Allowance for credit losses on loans
Balance at beginning of period			94,071	41,044	41,044
Allowance for Credit Losses on Loans	$ 82,182		82,182		94,071
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Provision for credit losses			(595)		71,792
Balance at end of period	$ 82,182		$ 82,182		$ 94,071
Percent of Loans	1.91%		1.91%		2.17%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (14,340)		$ (22,920)
Net Charge offs			(11,293)		(22,277)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						43,331
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					474
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						2,287
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Allowance for credit losses on loans
Balance at beginning of period			78,080	32,447	32,447
Allowance for Credit Losses on Loans	$ 56,441		56,441		78,080
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Provision for credit losses			(21,709)		18,816
Balance at end of period	$ 56,441		$ 56,441		$ 78,080
Percent of Loans	3.08%		3.08%		4.24%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (5)		$ (19)
Net Charge offs			69		31
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						58,261
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					537
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						25,814
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Allowance for credit losses on loans
Balance at beginning of period			172,152	73,490	73,490
Allowance for Credit Losses on Loans	$ 138,623		138,623		172,152
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Provision for credit losses			(22,304)		90,608
Balance at end of period	$ 138,623		$ 138,623		$ 172,152
Percent of Loans	2.26%		2.26%		2.78%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (14,344)		$ (22,938)
Net Charge offs			(11,224)		(22,246)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						101,591
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					1,011
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						28,101
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Allowance for credit losses on loans
Balance at beginning of period			349,327	187,311	187,311
Allowance for Credit Losses on Loans	$ 259,593		259,593		349,327
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Provision for credit losses			(72,267)		178,569
Balance at end of period	$ 259,593		$ 259,593		$ 349,327
Percent of Loans	1.72%		1.72%		2.25%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (28,117)		$ (103,677)
Net Charge offs			(17,467)		(95,834)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						262,482
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					1,739
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						75,171
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Allowance for credit losses on loans
Balance at beginning of period			42,996	16,960	16,960
Allowance for Credit Losses on Loans	$ 41,620		41,620		42,996
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Provision for credit losses			(1,344)		(6,864)
Balance at end of period	$ 41,620		$ 41,620		$ 42,996
Percent of Loans	0.55%		0.55%		0.55%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (732)		$ (1,867)
Net Charge offs			(32)		(1,367)
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						50,175
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					403
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						33,215
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Allowance for credit losses on loans
Balance at beginning of period			21,967	11,964	11,964
Allowance for Credit Losses on Loans	$ 17,348		17,348		21,967
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Provision for credit losses			(6,259)		(5,358)
Balance at end of period	$ 17,348		$ 17,348		$ 21,967
Percent of Loans	2.85%		2.85%		3.11%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (600)		$ (1,719)
Net Charge offs			1,640		259
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						26,204
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					440
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						14,240
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Allowance for credit losses on loans
Balance at beginning of period			17,187	7,044	7,044
Allowance for Credit Losses on Loans					17,187
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Provision for credit losses					5,111
Balance at end of period					$ 17,187
Percent of Loans					5.49%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs					$ (4,790)
Net Charge offs					(3,689)
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						15,564
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					140
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,520
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			965
Net Charge offs			(1,366)
Allowance for credit losses on loans
Balance at beginning of period			17,013
Allowance for Credit Losses on Loans	$ 13,591		13,591		17,013
Recoveries			965
Net Charge offs			(1,366)
Provision for credit losses			(2,056)
Balance at end of period	$ 13,591		$ 13,591		17,013
Percent of Loans	4.61%		4.61%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (2,331)
Net Charge offs			(1,366)
Allowance for Loans Losses and Unfunded Commitments [Member] | Auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			24
Net Charge offs			20
Allowance for credit losses on loans
Balance at beginning of period			174
Allowance for Credit Losses on Loans	$ 120		120		174
Recoveries			24
Net Charge offs			20
Provision for credit losses			(74)
Balance at end of period	$ 120		$ 120		174
Percent of Loans	1.79%		1.79%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (4)
Net Charge offs			20
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Allowance for credit losses on loans
Balance at beginning of period			82,150	$ 35,968	35,968
Allowance for Credit Losses on Loans	$ 72,679		72,679		82,150
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Provision for credit losses			(9,733)		(7,112)
Balance at end of period	$ 72,679		$ 72,679		$ 82,150
Percent of Loans	0.85%		0.85%		0.92%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (3,667)		$ (8,376)
Net Charge offs			$ 262		(4,797)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						91,943
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					$ 983
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						$ 55,975