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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Jan. 01, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance $ 201,371        
Financing Receivable, Allowance for Credit Loss 201,371 $ 201,371      
Net Charge offs   (55,152)      
Financing Receivable, Allowance for Credit Loss, Ending Balance   201,371      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Balance at beginning of period 21,907        
Cumulative effect of ASU 2016-13 adoption (CECL) 47,776 21,907   $ 47,776  
Provision for credit losses 7,000        
Balance at end of period 47,776 21,907      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (55,152)      
Provision for credit losses 174,006 16,000 $ 0    
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 201,371 238,023      
Recoveries   19,161      
Net charge offs   55,152      
Provision for loan losses   18,500      
Balance at end of period 383,702 201,371 238,023    
Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss         $ 131,147
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss         354,425
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         40,597
First Staunton Bancshares          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Provision for credit losses 179        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         18,690
Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (51,441)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (51,441)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 91,133 108,835      
Recoveries   11,875      
Net charge offs   51,441      
Provision for loan losses   33,738      
Balance at end of period   91,133 108,835    
Commercial real estate - owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   2,573      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   2,573      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 10,284 9,255      
Recoveries   2,795      
Net charge offs   (2,573)      
Provision for loan losses   (1,543)      
Balance at end of period   10,284 9,255    
Commercial and business lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (48,868)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (48,868)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 101,417 118,090      
Recoveries   14,670      
Net charge offs   48,868      
Provision for loan losses   32,195      
Balance at end of period   101,417 118,090    
Commercial real estate - investor          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   31      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   31      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 40,514 40,844      
Recoveries   31      
Net charge offs   (31)      
Provision for loan losses   (361)      
Balance at end of period   40,514 40,844    
Real estate construction          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   243      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   243      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 24,915 28,240      
Recoveries   302      
Net charge offs   (243)      
Provision for loan losses   (3,568)      
Balance at end of period   24,915 28,240    
Commercial real estate lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   274      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   274      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 65,428 69,084      
Recoveries   333      
Net charge offs   (274)      
Provision for loan losses   (3,929)      
Balance at end of period   65,428 69,084    
Total commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (48,594)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (48,594)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 166,846 187,174      
Recoveries   15,003      
Net charge offs   48,594      
Provision for loan losses   28,266      
Balance at end of period   166,846 187,174    
Residential mortgage          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (2,630)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (2,630)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 16,960 25,595      
Recoveries   692      
Net charge offs   2,630      
Provision for loan losses   (6,005)      
Balance at end of period   16,960 25,595    
Home equity          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   753      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   753      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 10,926 19,266      
Recoveries   2,599      
Net charge offs   (753)      
Provision for loan losses   (9,093)      
Balance at end of period   10,926 19,266    
Other consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (4,681)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (4,681)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 6,639 5,988      
Recoveries   868      
Net charge offs   4,681      
Provision for loan losses   5,332      
Balance at end of period   6,639 5,988    
Total consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Net Charge offs   (6,558)      
Allowance for Credit Losses on Loans [Abstract]          
Net Charge offs   (6,558)      
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of year 34,525 50,849      
Recoveries   4,158      
Net charge offs   6,558      
Provision for loan losses   (9,766)      
Balance at end of period   34,525 $ 50,849    
Allowance for Loan Losses [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 201,371        
Financing Receivable, Allowance for Credit Loss 383,702 201,371   383,702  
Financing Receivable, Allowance for Credit Loss, Writeoff 112,053 74,313      
Financing Receivable, Allowance for Credit Loss, Recovery 11,422        
Net Charge offs (100,631)        
Gross up of allowance for PCD loans at acquistion 3,504        
Provision for loan losses 164,457        
Financing Receivable, Allowance for Credit Loss, Ending Balance 383,702 201,371      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 11,422        
Net Charge offs (100,631)        
Gross up of allowance for PCD loans at acquistion 3,504        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (112,053) (74,313)      
Net charge offs 100,631        
Allowance for Loan Losses [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 313,828     313,828  
Financing Receivable, Allowance for Credit Loss, Ending Balance 313,828        
Allowance for Loan Losses [Member] | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 2,543        
Allowance for Loan Losses [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 112,457     112,457 112,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 112,457        
Allowance for Loan Losses [Member] | PPP          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 0        
Financing Receivable, Allowance for Credit Loss 531 0   531  
Financing Receivable, Allowance for Credit Loss, Writeoff 0        
Financing Receivable, Allowance for Credit Loss, Recovery 0        
Net Charge offs 0        
Gross up of allowance for PCD loans at acquistion 0        
Provision for loan losses 531        
Financing Receivable, Allowance for Credit Loss, Ending Balance 531 0      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 0        
Net Charge offs 0        
Gross up of allowance for PCD loans at acquistion 0        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs 0        
Net charge offs 0        
Allowance for Loan Losses [Member] | PPP | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 0     0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 0        
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 0        
Allowance for Loan Losses [Member] | PPP | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 0     0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 0        
Allowance for Loan Losses [Member] | Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 91,133        
Financing Receivable, Allowance for Credit Loss 142,793 91,133   142,793  
Financing Receivable, Allowance for Credit Loss, Writeoff 80,320 63,315      
Financing Receivable, Allowance for Credit Loss, Recovery 7,004        
Net Charge offs (73,316)        
Gross up of allowance for PCD loans at acquistion 293        
Provision for loan losses 71,355        
Financing Receivable, Allowance for Credit Loss, Ending Balance 142,793 91,133      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 7,004        
Net Charge offs (73,316)        
Gross up of allowance for PCD loans at acquistion 293        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (80,320) (63,315)      
Net charge offs 73,316        
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 144,052     144,052  
Financing Receivable, Allowance for Credit Loss, Ending Balance 144,052        
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 408        
Allowance for Loan Losses [Member] | Commercial and industrial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 52,919     52,919  
Financing Receivable, Allowance for Credit Loss, Ending Balance 52,919        
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 10,284        
Financing Receivable, Allowance for Credit Loss 11,274 10,284   11,274  
Financing Receivable, Allowance for Credit Loss, Writeoff 419 222      
Financing Receivable, Allowance for Credit Loss, Recovery 147        
Net Charge offs (272)        
Gross up of allowance for PCD loans at acquistion 890        
Provision for loan losses 1,967        
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,274 10,284      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 147        
Net Charge offs (272)        
Gross up of allowance for PCD loans at acquistion 890        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (419) (222)      
Net charge offs 272        
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 8,433     8,433  
Financing Receivable, Allowance for Credit Loss, Ending Balance 8,433        
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 255        
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss (1,851)     (1,851)  
Financing Receivable, Allowance for Credit Loss, Ending Balance (1,851)        
Allowance for Loan Losses [Member] | Commercial and business lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 101,417        
Financing Receivable, Allowance for Credit Loss 154,598 101,417   154,598  
Financing Receivable, Allowance for Credit Loss, Writeoff 80,739 63,537      
Financing Receivable, Allowance for Credit Loss, Recovery 7,151        
Net Charge offs (73,588)        
Gross up of allowance for PCD loans at acquistion 1,183        
Provision for loan losses 73,853        
Financing Receivable, Allowance for Credit Loss, Ending Balance 154,598 101,417      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 7,151        
Net Charge offs (73,588)        
Gross up of allowance for PCD loans at acquistion 1,183        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (80,739) (63,537)      
Net charge offs 73,588        
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 152,485     152,485  
Financing Receivable, Allowance for Credit Loss, Ending Balance 152,485        
Allowance for Loan Losses [Member] | Commercial and business lending | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 663        
Allowance for Loan Losses [Member] | Commercial and business lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 51,068     51,068  
Financing Receivable, Allowance for Credit Loss, Ending Balance 51,068        
Allowance for Loan Losses [Member] | Commercial real estate - investor          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 40,514        
Financing Receivable, Allowance for Credit Loss 93,435 40,514   93,435  
Financing Receivable, Allowance for Credit Loss, Writeoff 22,920 0      
Financing Receivable, Allowance for Credit Loss, Recovery 643        
Net Charge offs (22,277)        
Gross up of allowance for PCD loans at acquistion 753        
Provision for loan losses 71,933        
Financing Receivable, Allowance for Credit Loss, Ending Balance 93,435 40,514      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 643        
Net Charge offs (22,277)        
Gross up of allowance for PCD loans at acquistion 753        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (22,920) 0      
Net charge offs 22,277        
Allowance for Loan Losses [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 42,555     42,555  
Financing Receivable, Allowance for Credit Loss, Ending Balance 42,555        
Allowance for Loan Losses [Member] | Commercial real estate - investor | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 472        
Allowance for Loan Losses [Member] | Commercial real estate - investor | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 2,041     2,041  
Financing Receivable, Allowance for Credit Loss, Ending Balance 2,041        
Allowance for Loan Losses [Member] | Real estate construction          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 24,915        
Financing Receivable, Allowance for Credit Loss 59,193 24,915   59,193  
Financing Receivable, Allowance for Credit Loss, Writeoff 19 60      
Financing Receivable, Allowance for Credit Loss, Recovery 49        
Net Charge offs 31        
Gross up of allowance for PCD loans at acquistion 435        
Provision for loan losses 25,854        
Financing Receivable, Allowance for Credit Loss, Ending Balance 59,193 24,915      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 49        
Net Charge offs 31        
Gross up of allowance for PCD loans at acquistion 435        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (19) (60)      
Net charge offs (31)        
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 32,382     32,382  
Financing Receivable, Allowance for Credit Loss, Ending Balance 32,382        
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 492        
Allowance for Loan Losses [Member] | Real estate construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 7,467     7,467  
Financing Receivable, Allowance for Credit Loss, Ending Balance 7,467        
Allowance for Loan Losses [Member] | Commercial real estate lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 65,428        
Financing Receivable, Allowance for Credit Loss 152,629 65,428   152,629  
Financing Receivable, Allowance for Credit Loss, Writeoff 22,938 60      
Financing Receivable, Allowance for Credit Loss, Recovery 692        
Net Charge offs (22,246)        
Gross up of allowance for PCD loans at acquistion 1,188        
Provision for loan losses 97,787        
Financing Receivable, Allowance for Credit Loss, Ending Balance 152,629 65,428      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 692        
Net Charge offs (22,246)        
Gross up of allowance for PCD loans at acquistion 1,188        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (22,938) (60)      
Net charge offs 22,246        
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 74,937     74,937  
Financing Receivable, Allowance for Credit Loss, Ending Balance 74,937        
Allowance for Loan Losses [Member] | Commercial real estate lending | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 964        
Allowance for Loan Losses [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 9,508     9,508  
Financing Receivable, Allowance for Credit Loss, Ending Balance 9,508        
Allowance for Loan Losses [Member] | Total commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 166,846        
Financing Receivable, Allowance for Credit Loss 307,226 166,846   307,226  
Financing Receivable, Allowance for Credit Loss, Writeoff 103,677 63,597      
Financing Receivable, Allowance for Credit Loss, Recovery 7,844        
Net Charge offs (95,834)        
Gross up of allowance for PCD loans at acquistion 2,371        
Provision for loan losses 171,641        
Financing Receivable, Allowance for Credit Loss, Ending Balance 307,226 166,846      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 7,844        
Net Charge offs (95,834)        
Gross up of allowance for PCD loans at acquistion 2,371        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (103,677) (63,597)      
Net charge offs 95,834        
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 227,422     227,422  
Financing Receivable, Allowance for Credit Loss, Ending Balance 227,422        
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 1,627        
Allowance for Loan Losses [Member] | Total commercial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 60,576     60,576  
Financing Receivable, Allowance for Credit Loss, Ending Balance 60,576        
Allowance for Loan Losses [Member] | Residential mortgage          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 16,960        
Financing Receivable, Allowance for Credit Loss 42,996 16,960   42,996  
Financing Receivable, Allowance for Credit Loss, Writeoff 1,867 3,322      
Financing Receivable, Allowance for Credit Loss, Recovery 500        
Net Charge offs (1,367)        
Gross up of allowance for PCD loans at acquistion 651        
Provision for loan losses (6,864)        
Financing Receivable, Allowance for Credit Loss, Ending Balance 42,996 16,960      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 500        
Net Charge offs (1,367)        
Gross up of allowance for PCD loans at acquistion 651        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (1,867) (3,322)      
Net charge offs 1,367        
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 50,175     50,175  
Financing Receivable, Allowance for Credit Loss, Ending Balance 50,175        
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 403        
Allowance for Loan Losses [Member] | Residential mortgage | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 33,215     33,215  
Financing Receivable, Allowance for Credit Loss, Ending Balance 33,215        
Allowance for Loan Losses [Member] | Home equity          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 10,926        
Financing Receivable, Allowance for Credit Loss 18,849 10,926   18,849  
Financing Receivable, Allowance for Credit Loss, Writeoff 1,719 1,846      
Financing Receivable, Allowance for Credit Loss, Recovery 1,978        
Net Charge offs 259        
Gross up of allowance for PCD loans at acquistion 422        
Provision for loan losses (4,781)        
Financing Receivable, Allowance for Credit Loss, Ending Balance 18,849 10,926      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 1,978        
Net Charge offs 259        
Gross up of allowance for PCD loans at acquistion 422        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (1,719) (1,846)      
Net charge offs (259)        
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 22,575     22,575  
Financing Receivable, Allowance for Credit Loss, Ending Balance 22,575        
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 374        
Allowance for Loan Losses [Member] | Home equity | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 11,649     11,649  
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,649        
Allowance for Loan Losses [Member] | Other consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 6,639        
Financing Receivable, Allowance for Credit Loss 14,630 6,639   14,630  
Financing Receivable, Allowance for Credit Loss, Writeoff 4,790 5,548      
Financing Receivable, Allowance for Credit Loss, Recovery 1,101        
Net Charge offs (3,689)        
Gross up of allowance for PCD loans at acquistion 61        
Provision for loan losses 4,462        
Financing Receivable, Allowance for Credit Loss, Ending Balance 14,630 6,639      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 1,101        
Net Charge offs (3,689)        
Gross up of allowance for PCD loans at acquistion 61        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (4,790) (5,548)      
Net charge offs 3,689        
Allowance for Loan Losses [Member] | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 13,655     13,655  
Financing Receivable, Allowance for Credit Loss, Ending Balance 13,655        
Allowance for Loan Losses [Member] | Other consumer | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 140        
Allowance for Loan Losses [Member] | Other consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 7,016     7,016  
Financing Receivable, Allowance for Credit Loss, Ending Balance 7,016        
Allowance for Loan Losses [Member] | Total consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance 34,525        
Financing Receivable, Allowance for Credit Loss 76,475 34,525   76,475  
Financing Receivable, Allowance for Credit Loss, Writeoff 8,376 10,716      
Financing Receivable, Allowance for Credit Loss, Recovery 3,579        
Net Charge offs (4,797)        
Gross up of allowance for PCD loans at acquistion 1,134        
Provision for loan losses (7,183)        
Financing Receivable, Allowance for Credit Loss, Ending Balance 76,475 34,525      
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Recovery 3,579        
Net Charge offs (4,797)        
Gross up of allowance for PCD loans at acquistion 1,134        
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (8,376) (10,716)      
Net charge offs 4,797        
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 86,405     86,405  
Financing Receivable, Allowance for Credit Loss, Ending Balance 86,405        
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Provision for loan losses 917        
Allowance for Loan Losses [Member] | Total consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss 51,880     51,880  
Financing Receivable, Allowance for Credit Loss, Ending Balance 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 21,907        
Cumulative effect of ASU 2016-13 adoption (CECL) 47,776 21,907   47,776  
Provision for credit losses 7,000        
Balance at end of period 47,776 21,907      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         40,597
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 18,690     18,690 19,000
Balance at end of period 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 12,276        
Cumulative effect of ASU 2016-13 adoption (CECL) 22,311 12,276   22,311  
Provision for credit losses 13,972        
Balance at end of period 22,311 12,276      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         8,278
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) (3,998)     (3,998)  
Balance at end of period (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 127        
Cumulative effect of ASU 2016-13 adoption (CECL) 266 127   266  
Provision for credit losses 135        
Balance at end of period 266 127      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 0     0  
Balance at end of period 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 12,403        
Cumulative effect of ASU 2016-13 adoption (CECL) 22,577 12,403   22,577  
Provision for credit losses 14,108        
Balance at end of period 22,577 12,403      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         8,405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) (3,998)     (3,998)  
Balance at end of period (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 530        
Cumulative effect of ASU 2016-13 adoption (CECL) 636 530   636  
Provision for credit losses (141)        
Balance at end of period 636 530      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 246     246  
Balance at end of period 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 7,532        
Cumulative effect of ASU 2016-13 adoption (CECL) 18,886 7,532   18,886  
Provision for credit losses (7,038)        
Balance at end of period 18,886 7,532      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         25,879
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 18,347     18,347  
Balance at end of period 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 8,062        
Cumulative effect of ASU 2016-13 adoption (CECL) 19,522 8,062   19,522  
Provision for credit losses (7,179)        
Balance at end of period 19,522 8,062      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         26,655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 18,593     18,593  
Balance at end of period 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 20,465        
Cumulative effect of ASU 2016-13 adoption (CECL) 42,099 20,465   42,099  
Provision for credit losses 6,929        
Balance at end of period 42,099 20,465      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         35,060
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 14,595     14,595  
Balance at end of period 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 1,038        
Cumulative effect of ASU 2016-13 adoption (CECL) 3,118 1,038   3,118  
Provision for credit losses (577)        
Balance at end of period 3,118 1,038      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         3,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 2,591     2,591  
Balance at end of period 2,591        
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Balance at beginning of period 405        
Cumulative effect of ASU 2016-13 adoption (CECL) 2,557 405   2,557  
Provision for credit losses 649        
Balance at end of period 2,557 405      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | First Staunton Bancshares          
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 | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 1,504     1,504  
Balance at end of period 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 1,443        
Cumulative effect of ASU 2016-13 adoption (CECL) 5,676 1,443   5,676  
Provision for credit losses 72        
Balance at end of period 5,676 1,443      
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL)         5,538
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | First Staunton Bancshares          
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Cumulative effect of ASU 2016-13 adoption (CECL) 4,095     4,095  
Balance at end of period 4,095        
Allowance for Loans Losses and Unfunded Commitments [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 112,053        
Financing Receivable, Allowance for Credit Loss, Recovery 11,422        
Net Charge offs (100,631)        
Gross up of allowance for PCD loans at acquistion 3,504        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 223,278        
allowance for credit losses on loans 431,478 223,278   $ 431,478  
Financing Receivable, Allowance for Credit Loss, Recovery 11,422        
Net Charge offs (100,631)        
Gross up of allowance for PCD loans at acquistion 3,504        
Provision for credit losses 171,457        
Balance at end of period 431,478 223,278      
Percent of Loans       1.76%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (112,053)        
Net charge offs 100,631        
Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         354,425
Allowance for Loans Losses and Unfunded Commitments [Member] | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 2,722        
Allowance for Loans Losses and Unfunded Commitments [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss         131,000
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 131,147     $ 131,147  
Balance at end of period 131,147        
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 0        
Financing Receivable, Allowance for Credit Loss, Recovery 0        
Net Charge offs 0        
Gross up of allowance for PCD loans at acquistion 0        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 0        
allowance for credit losses on loans 531 0   $ 531  
Financing Receivable, Allowance for Credit Loss, Recovery 0        
Net Charge offs 0        
Gross up of allowance for PCD loans at acquistion 0        
Provision for credit losses 531        
Balance at end of period 531 0      
Percent of Loans       0.07%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs 0        
Net charge offs 0        
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 0        
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 0     $ 0  
Balance at end of period 0        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 80,320        
Financing Receivable, Allowance for Credit Loss, Recovery 7,004        
Net Charge offs (73,316)        
Gross up of allowance for PCD loans at acquistion 293        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 103,409        
allowance for credit losses on loans 165,105 103,409   $ 165,105  
Financing Receivable, Allowance for Credit Loss, Recovery 7,004        
Net Charge offs (73,316)        
Gross up of allowance for PCD loans at acquistion 293        
Provision for credit losses 85,327        
Balance at end of period 165,105 103,409      
Percent of Loans       2.14%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (80,320)        
Net charge offs 73,316        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         152,330
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 469        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 48,921     $ 48,921  
Balance at end of period 48,921        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 419        
Financing Receivable, Allowance for Credit Loss, Recovery 147        
Net Charge offs (272)        
Gross up of allowance for PCD loans at acquistion 890        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 10,411        
allowance for credit losses on loans 11,539 10,411   $ 11,539  
Financing Receivable, Allowance for Credit Loss, Recovery 147        
Net Charge offs (272)        
Gross up of allowance for PCD loans at acquistion 890        
Provision for credit losses 2,102        
Balance at end of period 11,539 10,411      
Percent of Loans       1.28%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (419)        
Net charge offs 272        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         8,560
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 259        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans (1,851)     $ (1,851)  
Balance at end of period (1,851)        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 80,739        
Financing Receivable, Allowance for Credit Loss, Recovery 7,151        
Net Charge offs (73,588)        
Gross up of allowance for PCD loans at acquistion 1,183        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 113,820        
allowance for credit losses on loans 177,175 113,820   $ 177,175  
Financing Receivable, Allowance for Credit Loss, Recovery 7,151        
Net Charge offs (73,588)        
Gross up of allowance for PCD loans at acquistion 1,183        
Provision for credit losses 87,961        
Balance at end of period 177,175 113,820      
Percent of Loans       1.89%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (80,739)        
Net charge offs 73,588        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         160,890
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 728        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 47,070     $ 47,070  
Balance at end of period 47,070        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 22,920        
Financing Receivable, Allowance for Credit Loss, Recovery 643        
Net Charge offs (22,277)        
Gross up of allowance for PCD loans at acquistion 753        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 41,044        
allowance for credit losses on loans 94,071 41,044   $ 94,071  
Financing Receivable, Allowance for Credit Loss, Recovery 643        
Net Charge offs (22,277)        
Gross up of allowance for PCD loans at acquistion 753        
Provision for credit losses 71,792        
Balance at end of period 94,071 41,044      
Percent of Loans       2.17%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (22,920)        
Net charge offs 22,277        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         43,331
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 474        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 2,287     $ 2,287  
Balance at end of period 2,287        
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 19        
Financing Receivable, Allowance for Credit Loss, Recovery 49        
Net Charge offs 31        
Gross up of allowance for PCD loans at acquistion 435        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 32,447        
allowance for credit losses on loans 78,079 32,447   $ 78,079  
Financing Receivable, Allowance for Credit Loss, Recovery 49        
Net Charge offs 31        
Gross up of allowance for PCD loans at acquistion 435        
Provision for credit losses 18,816        
Balance at end of period 78,079 32,447      
Percent of Loans       4.24%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (19)        
Net charge offs (31)        
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         58,261
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 537        
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 25,814     $ 25,814  
Balance at end of period 25,814        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 22,938        
Financing Receivable, Allowance for Credit Loss, Recovery 692        
Net Charge offs (22,246)        
Gross up of allowance for PCD loans at acquistion 1,188        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 73,490        
allowance for credit losses on loans 172,151 73,490   $ 172,151  
Financing Receivable, Allowance for Credit Loss, Recovery 692        
Net Charge offs (22,246)        
Gross up of allowance for PCD loans at acquistion 1,188        
Provision for credit losses 90,608        
Balance at end of period 172,151 73,490      
Percent of Loans       2.78%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (22,938)        
Net charge offs 22,246        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         101,591
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 1,011        
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 28,101     $ 28,101  
Balance at end of period 28,101        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 103,677        
Financing Receivable, Allowance for Credit Loss, Recovery 7,844        
Net Charge offs (95,834)        
Gross up of allowance for PCD loans at acquistion 2,371        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 187,311        
allowance for credit losses on loans 349,326 187,311   $ 349,326  
Financing Receivable, Allowance for Credit Loss, Recovery 7,844        
Net Charge offs (95,834)        
Gross up of allowance for PCD loans at acquistion 2,371        
Provision for credit losses 178,569        
Balance at end of period 349,326 187,311      
Percent of Loans       2.25%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (103,677)        
Net charge offs 95,834        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         262,482
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 1,739        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 75,171     $ 75,171  
Balance at end of period 75,171        
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 1,867        
Financing Receivable, Allowance for Credit Loss, Recovery 500        
Net Charge offs (1,367)        
Gross up of allowance for PCD loans at acquistion 651        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 16,960        
allowance for credit losses on loans 42,997 16,960   $ 42,997  
Financing Receivable, Allowance for Credit Loss, Recovery 500        
Net Charge offs (1,367)        
Gross up of allowance for PCD loans at acquistion 651        
Provision for credit losses 6,865        
Balance at end of period 42,997 16,960      
Percent of Loans       0.55%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (1,867)        
Net charge offs 1,367        
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         50,175
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 403        
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 33,215     $ 33,215  
Balance at end of period 33,215        
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 1,719        
Financing Receivable, Allowance for Credit Loss, Recovery 1,978        
Net Charge offs 259        
Gross up of allowance for PCD loans at acquistion 422        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 11,964        
allowance for credit losses on loans 21,967 11,964   $ 21,967  
Financing Receivable, Allowance for Credit Loss, Recovery 1,978        
Net Charge offs 259        
Gross up of allowance for PCD loans at acquistion 422        
Provision for credit losses 5,358        
Balance at end of period 21,967 11,964      
Percent of Loans       3.11%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (1,719)        
Net charge offs (259)        
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         26,204
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 440        
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 14,240     $ 14,240  
Balance at end of period 14,240        
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 4,790        
Financing Receivable, Allowance for Credit Loss, Recovery 1,101        
Net Charge offs (3,689)        
Gross up of allowance for PCD loans at acquistion 61        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 7,044        
allowance for credit losses on loans 17,187 7,044   $ 17,187  
Financing Receivable, Allowance for Credit Loss, Recovery 1,101        
Net Charge offs (3,689)        
Gross up of allowance for PCD loans at acquistion 61        
Provision for credit losses 5,111        
Balance at end of period 17,187 7,044      
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 | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         15,564
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 140        
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 8,520     $ 8,520  
Balance at end of period 8,520        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff 8,376        
Financing Receivable, Allowance for Credit Loss, Recovery 3,579        
Net Charge offs (4,797)        
Gross up of allowance for PCD loans at acquistion 1,134        
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period 35,968        
allowance for credit losses on loans 82,151 35,968   $ 82,151  
Financing Receivable, Allowance for Credit Loss, Recovery 3,579        
Net Charge offs (4,797)        
Gross up of allowance for PCD loans at acquistion 1,134        
Provision for credit losses 7,112        
Balance at end of period 82,151 $ 35,968      
Percent of Loans       0.92%  
Allowance for Loan and Lease Losses [Roll Forward]          
Charge offs (8,376)        
Net charge offs 4,797        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans         $ 91,943
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | First Staunton Bancshares          
Allowance for Credit Losses on Loans [Abstract]          
Provision for credit losses 983        
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Credit Losses on Loans [Abstract]          
allowance for credit losses on loans 55,975     $ 55,975  
Balance at end of period $ 55,975