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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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 $ 45,276   45,276   47,776  
Provision for credit losses     (2,500)   7,000  
Balance at end of period 45,276   45,276   47,776  
Allowance for credit losses on loans            
Provision for credit losses (35,004) $ 61,000 (58,009) 114,001    
Allowance for Loan and Lease Losses [Roll Forward]            
Balance at beginning of period     383,702      
Balance at end of period 318,811   318,811   383,702  
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Total allowance for loan losses 318,811   318,811   383,702  
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 23,947,536   23,947,536   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 405,482   405,482   767,757  
Commercial and industrial            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 7,909,119   7,909,119   7,701,422  
Commercial real estate — owner occupied            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 880,755   880,755   900,912  
Commercial and business lending            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 9,195,355   9,195,355   9,370,091  
Commercial real estate — investor            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 4,300,651   4,300,651   4,342,584  
Real estate construction            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 1,880,897   1,880,897   1,840,417  
Commercial real estate lending            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 6,181,549   6,181,549   6,183,001  
Total commercial            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 15,376,904   15,376,904   15,553,091  
Home equity            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 631,783   631,783   707,255  
Total consumer            
Loans [Abstract]            
Loans and Leases Receivable, Net of Deferred Income, Total 8,570,632   8,570,632   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 318,811   318,811   383,702  
Recoveries     11,464   11,422  
Net Charge offs     (9,391)   (100,631)  
Gross up of allowance for PCD loans at acquisition         3,504  
Provision for credit losses     (55,500)   164,457  
Balance at end of period 318,811   318,811   383,702  
Allowance for credit losses on loans            
Recoveries     11,464   11,422  
Net Charge offs     (9,391)   (100,631)  
Gross up of allowance for PCD loans at acquisition         3,504  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (20,855)   (112,053)  
Net Charge offs     (9,391)   (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 232   232   531  
Recoveries     0   0  
Net Charge offs     0   0  
Gross up of allowance for PCD loans at acquisition         0  
Provision for credit losses     (299)   531  
Balance at end of period 232   232   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 104,315   104,315   142,793  
Recoveries     6,423   7,004  
Net Charge offs     2,700   (73,316)  
Gross up of allowance for PCD loans at acquisition         293  
Provision for credit losses     (41,178)   71,355  
Balance at end of period 104,315   104,315   142,793  
Allowance for credit losses on loans            
Recoveries     6,423   7,004  
Net Charge offs     2,700   (73,316)  
Gross up of allowance for PCD loans at acquisition         293  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (3,723)   (80,320)  
Net Charge offs     2,700   (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 12,306   12,306   11,274  
Recoveries     9   147  
Net Charge offs     9   (272)  
Gross up of allowance for PCD loans at acquisition         890  
Provision for credit losses     1,023   1,967  
Balance at end of period 12,306   12,306   11,274  
Allowance for credit losses on loans            
Recoveries     9   147  
Net Charge offs     9   (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     9   (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 116,853   116,853   154,598  
Recoveries     6,432   7,151  
Net Charge offs     2,709   (73,588)  
Gross up of allowance for PCD loans at acquisition         1,183  
Provision for credit losses     (40,454)   73,853  
Balance at end of period 116,853   116,853   154,598  
Allowance for credit losses on loans            
Recoveries     6,432   7,151  
Net Charge offs     2,709   (73,588)  
Gross up of allowance for PCD loans at acquisition         1,183  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (3,723)   (80,739)  
Net Charge offs     2,709   (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 83,371   83,371   93,435  
Recoveries     2,865   643  
Net Charge offs     (11,475)   (22,277)  
Gross up of allowance for PCD loans at acquisition         753  
Provision for credit losses     1,410   71,933  
Balance at end of period 83,371   83,371   93,435  
Allowance for credit losses on loans            
Recoveries     2,865   643  
Net Charge offs     (11,475)   (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     (11,475)   (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 49,221   49,221   59,193  
Recoveries     54   49  
Net Charge offs     52   31  
Gross up of allowance for PCD loans at acquisition         435  
Provision for credit losses     (10,023)   25,854  
Balance at end of period 49,221   49,221   59,193  
Allowance for credit losses on loans            
Recoveries     54   49  
Net Charge offs     52   31  
Gross up of allowance for PCD loans at acquisition         435  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (3)   (19)  
Net Charge offs     52   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 132,592   132,592   152,629  
Recoveries     2,919   692  
Net Charge offs     (11,423)   (22,246)  
Gross up of allowance for PCD loans at acquisition         1,188  
Provision for credit losses     (8,613)   97,787  
Balance at end of period 132,592   132,592   152,629  
Allowance for credit losses on loans            
Recoveries     2,919   692  
Net Charge offs     (11,423)   (22,246)  
Gross up of allowance for PCD loans at acquisition         1,188  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (14,342)   (22,938)  
Net Charge offs     (11,423)   (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 249,445   249,445   307,226  
Recoveries     9,350   7,844  
Net Charge offs     (8,715)   (95,834)  
Gross up of allowance for PCD loans at acquisition         2,371  
Provision for credit losses     (49,067)   171,641  
Balance at end of period 249,445   249,445   307,226  
Allowance for credit losses on loans            
Recoveries     9,350   7,844  
Net Charge offs     (8,715)   (95,834)  
Gross up of allowance for PCD loans at acquisition         2,371  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (18,065)   (103,677)  
Net Charge offs     (8,715)   (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 43,230   43,230   42,996  
Recoveries     222   500  
Net Charge offs     (332)   (1,367)  
Gross up of allowance for PCD loans at acquisition         651  
Provision for credit losses     566   (6,864)  
Balance at end of period 43,230   43,230   42,996  
Allowance for credit losses on loans            
Recoveries     222   500  
Net Charge offs     (332)   (1,367)  
Gross up of allowance for PCD loans at acquisition         651  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (554)   (1,867)  
Net Charge offs     (332)   (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 15,066   15,066   18,849  
Recoveries     1,216   1,978  
Net Charge offs     681   259  
Gross up of allowance for PCD loans at acquisition         422  
Provision for credit losses     (4,464)   (4,781)  
Balance at end of period 15,066   15,066   18,849  
Allowance for credit losses on loans            
Recoveries     1,216   1,978  
Net Charge offs     681   259  
Gross up of allowance for PCD loans at acquisition         422  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (535)   (1,719)  
Net Charge offs     681   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            
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 11,069   11,069   14,630  
Recoveries     675   1,101  
Net Charge offs     (1,025)   (3,689)  
Gross up of allowance for PCD loans at acquisition         61  
Provision for credit losses     (2,535)   4,462  
Balance at end of period 11,069   11,069   14,630  
Allowance for credit losses on loans            
Recoveries     675   1,101  
Net Charge offs     (1,025)   (3,689)  
Gross up of allowance for PCD loans at acquisition         61  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (1,700)   (4,790)  
Net Charge offs     (1,025)   (3,689)  
Allowance for Loan Losses [Member] | Other consumer | 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 | First Staunton Bancshares [Member]            
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Provision for credit losses         140  
Allowance for Loan Losses [Member] | Other 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           7,016
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 69,366   69,366   76,475  
Recoveries     2,114   3,579  
Net Charge offs     (676)   (4,797)  
Gross up of allowance for PCD loans at acquisition         1,134  
Provision for credit losses     (6,433)   (7,183)  
Balance at end of period 69,366   69,366   76,475  
Allowance for credit losses on loans            
Recoveries     2,114   3,579  
Net Charge offs     (676)   (4,797)  
Gross up of allowance for PCD loans at acquisition         1,134  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     (2,790)   (8,376)  
Net Charge offs     (676)   (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 45,276   45,276   47,776  
Provision for credit losses     (2,500)   7,000  
Balance at end of period 45,276   45,276   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 21,161   21,161   22,311  
Provision for credit losses     (1,151)   13,972  
Balance at end of period 21,161   21,161   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 406   406   266  
Provision for credit losses     140   135  
Balance at end of period 406   406   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 21,566   21,566   22,577  
Provision for credit losses     (1,011)   14,108  
Balance at end of period 21,566   21,566   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 723   723   636  
Provision for credit losses     87   (141)  
Balance at end of period 723   723   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 17,620   17,620   18,887  
Provision for credit losses     (1,267)   (7,038)  
Balance at end of period 17,620   17,620   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 18,343   18,343   19,523  
Provision for credit losses     (1,180)   (7,179)  
Balance at end of period 18,343   18,343   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 39,910   39,910   42,101  
Provision for credit losses     (2,191)   6,929  
Balance at end of period 39,910   39,910   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 2,946   2,946   3,118  
Provision for credit losses     (172)   (577)  
Balance at end of period 2,946   2,946   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            
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]            
Balance at beginning of period     2,557 405 405  
Off-Balance Sheet, Credit Loss, Liability 2,420   2,420   2,557  
Provision for credit losses     (137)   649  
Balance at end of period 2,420   2,420   2,557  
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | 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 | 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 | 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 5,366   5,366   5,675  
Provision for credit losses     (309)   72  
Balance at end of period 5,366   5,366   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     11,464   11,422  
Net Charge offs     (9,391)   (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 364,087   364,087   431,478  
Recoveries     11,464   11,422  
Net Charge offs     (9,391)   (100,631)  
Gross up of allowance for PCD loans at acquisition         3,504  
Provision for credit losses     (58,000)   171,457  
Balance at end of period $ 364,087   $ 364,087   $ 431,478  
Percent of Loans 1.52%   1.52%   1.76%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (20,855)   $ (112,053)  
Net Charge offs     (9,391)   (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 $ 232   232   531  
Recoveries     0   0  
Net Charge offs     0   0  
Gross up of allowance for PCD loans at acquisition         0  
Provision for credit losses     (299)   531  
Balance at end of period $ 232   $ 232   $ 531  
Percent of Loans 0.06%   0.06%   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     6,423   7,004  
Net Charge offs     2,700   (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 $ 125,476   125,476   165,105  
Recoveries     6,423   7,004  
Net Charge offs     2,700   (73,316)  
Gross up of allowance for PCD loans at acquisition         293  
Provision for credit losses     (42,328)   85,327  
Balance at end of period $ 125,476   $ 125,476   $ 165,105  
Percent of Loans 1.59%   1.59%   2.14%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (3,723)   $ (80,320)  
Net Charge offs     2,700   (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     9   147  
Net Charge offs     9   (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 $ 12,711   12,711   11,539  
Recoveries     9   147  
Net Charge offs     9   (272)  
Gross up of allowance for PCD loans at acquisition         890  
Provision for credit losses     1,163   2,102  
Balance at end of period $ 12,711   $ 12,711   $ 11,539  
Percent of Loans 1.44%   1.44%   1.28%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ 0   $ (419)  
Net Charge offs     9   (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     6,432   7,151  
Net Charge offs     2,709   (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 $ 138,419   138,419   177,175  
Recoveries     6,432   7,151  
Net Charge offs     2,709   (73,588)  
Gross up of allowance for PCD loans at acquisition         1,183  
Provision for credit losses     (41,465)   87,961  
Balance at end of period $ 138,419   $ 138,419   $ 177,175  
Percent of Loans 1.51%   1.51%   1.89%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (3,723)   $ (80,739)  
Net Charge offs     2,709   (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     2,865   643  
Net Charge offs     (11,475)   (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 $ 84,093   84,093   94,071  
Recoveries     2,865   643  
Net Charge offs     (11,475)   (22,277)  
Gross up of allowance for PCD loans at acquisition         753  
Provision for credit losses     1,497   71,792  
Balance at end of period $ 84,093   $ 84,093   $ 94,071  
Percent of Loans 1.96%   1.96%   2.17%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (14,340)   $ (22,920)  
Net Charge offs     (11,475)   (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     54   49  
Net Charge offs     52   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 $ 66,842   66,842   78,080  
Recoveries     54   49  
Net Charge offs     52   31  
Gross up of allowance for PCD loans at acquisition         435  
Provision for credit losses     (11,290)   18,816  
Balance at end of period $ 66,842   $ 66,842   $ 78,080  
Percent of Loans 3.55%   3.55%   4.24%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (3)   $ (19)  
Net Charge offs     52   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     2,919   692  
Net Charge offs     (11,423)   (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 $ 150,936   150,936   172,152  
Recoveries     2,919   692  
Net Charge offs     (11,423)   (22,246)  
Gross up of allowance for PCD loans at acquisition         1,188  
Provision for credit losses     (9,793)   90,608  
Balance at end of period $ 150,936   $ 150,936   $ 172,152  
Percent of Loans 2.44%   2.44%   2.78%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (14,342)   $ (22,938)  
Net Charge offs     (11,423)   (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     9,350   7,844  
Net Charge offs     (8,715)   (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 $ 289,355   289,355   349,327  
Recoveries     9,350   7,844  
Net Charge offs     (8,715)   (95,834)  
Gross up of allowance for PCD loans at acquisition         2,371  
Provision for credit losses     (51,257)   178,569  
Balance at end of period $ 289,355   $ 289,355   $ 349,327  
Percent of Loans 1.88%   1.88%   2.25%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (18,065)   $ (103,677)  
Net Charge offs     (8,715)   (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     222   500  
Net Charge offs     (332)   (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 $ 43,230   43,230   42,996  
Recoveries     222   500  
Net Charge offs     (332)   (1,367)  
Gross up of allowance for PCD loans at acquisition         651  
Provision for credit losses     566   (6,864)  
Balance at end of period $ 43,230   $ 43,230   $ 42,996  
Percent of Loans 0.57%   0.57%   0.55%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (554)   $ (1,867)  
Net Charge offs     (332)   (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     1,216   1,978  
Net Charge offs     681   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 $ 18,012   18,012   21,967  
Recoveries     1,216   1,978  
Net Charge offs     681   259  
Gross up of allowance for PCD loans at acquisition         422  
Provision for credit losses     (4,636)   (5,358)  
Balance at end of period $ 18,012   $ 18,012   $ 21,967  
Percent of Loans 2.85%   2.85%   3.11%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (535)   $ (1,719)  
Net Charge offs     681   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            
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Recoveries     675   1,101  
Net Charge offs     (1,025)   (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 $ 13,489   13,489   17,187  
Recoveries     675   1,101  
Net Charge offs     (1,025)   (3,689)  
Gross up of allowance for PCD loans at acquisition         61  
Provision for credit losses     (2,672)   5,111  
Balance at end of period $ 13,489   $ 13,489   $ 17,187  
Percent of Loans 4.49%   4.49%   5.49%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (1,700)   $ (4,790)  
Net Charge offs     (1,025)   (3,689)  
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | 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 | 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 | 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] | Total consumer            
Financing Receivable, Allowance for Credit Loss [Roll Forward]            
Recoveries     2,114   3,579  
Net Charge offs     (676)   (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 $ 74,731   74,731   82,150  
Recoveries     2,114   3,579  
Net Charge offs     (676)   (4,797)  
Gross up of allowance for PCD loans at acquisition         1,134  
Provision for credit losses     (6,743)   (7,112)  
Balance at end of period $ 74,731   $ 74,731   $ 82,150  
Percent of Loans 0.87%   0.87%   0.92%  
Allowance for Loan and Lease Losses [Roll Forward]            
Charge offs     $ (2,790)   $ (8,376)  
Net Charge offs     $ (676)   (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