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Business Segments - Financial Information by Business Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Interest and dividend income $ 342,886 $ 213,729 $ 932,500 $ 612,055
Less: Interest expense 126,170 92,587 340,496 260,354
NET INTEREST INCOME 216,716 121,142 592,004 351,701
Less: Provision for credit losses 2,082 4,798 74,183 19,352
Net interest income after provision for credit losses 214,634 116,344 517,821 332,349
Non-interest income:        
Trust fees 8,987 7,517 27,342 22,902
Service charges on deposits 11,163 7,945 30,233 21,841
Digital banking income 7,324 5,084 20,053 14,828
Net swap fee and valuation income 3,231 (627) 4,937 2,712
Net securities brokerage revenue 2,961 2,659 9,010 7,808
Bank-owned life insurance 3,765 2,173 10,643 7,032
Net securities gains 1,210 675 2,302 1,347
Net (loss) gain other real estate owned and other assets 329 (239) 400 (51)
Mortgage banking income 1,898 1,280 5,402 3,042
Other income 3,996 3,145 13,164 10,135
Less :        
Salaries and wages 60,583 44,890 169,314 131,879
Employee benefits 18,040 11,522 49,867 34,284
Net occupancy 8,819 6,226 24,716 19,158
Equipment and software 16,310 10,157 46,500 30,622
Marketing 2,979 2,977 7,225 7,233
FDIC insurance 5,820 3,604 15,487 10,576
Merger-related and restructuring 11,383 1,977 72,449 5,755
Amortization of intangibles 8,425 2,053 21,853 6,217
Segment profit (loss) before provision for income taxes 103,310 44,773 164,618 123,177
Provision for income taxes 19,737 7,501 32,623 21,296
Net income 83,573 37,272 131,995 101,881
Reconciliation of segment (loss) profit        
Preferred stock dividends (2,531) (2,531) (7,594) (7,594)
Net income available to common shareholders 81,042 34,741 124,401 94,287
Operating Segments [Member]        
Non-interest income:        
Total revenues 259,498 145,956 641,307 423,945
Less :        
Net income 83,573 37,272 131,995 101,881
Reconciliation of segment (loss) profit        
Preferred stock dividends (2,531) (2,531) (7,594) (7,594)
Net income available to common shareholders 81,042 34,741 124,401 94,287
Community Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Interest and dividend income 342,886 213,729 932,500 612,055
Less: Interest expense 118,756 87,536 321,210 245,111
NET INTEREST INCOME 224,130 126,193 611,290 366,944
Less: Provision for credit losses 2,082 4,798 74,183 19,352
Net interest income after provision for credit losses 222,048 121,395 537,107 347,592
Non-interest income:        
Service charges on deposits 11,163 7,945 30,233 21,841
Digital banking income 7,324 5,084 20,053 14,828
Net swap fee and valuation income 3,231 (627) 4,937 2,712
Net securities brokerage revenue 2,961 2,659 9,010 7,808
Net insurance services revenue 929 796 2,999 2,720
Bank-owned life insurance 3,765 2,173 10,643 7,032
Payment processing fees 843 925 2,539 2,659
Net securities gains 1,210 675 2,302 1,347
Net (loss) gain other real estate owned and other assets 329 (239) 400 (51)
Mortgage banking income 1,898 1,280 5,402 3,042
Other income 1,929 1,424 6,554 4,756
Total revenues 257,630 143,490 632,179 416,286
Less :        
Salaries and wages 58,361 43,052 162,960 126,395
Employee benefits 17,553 11,098 48,350 32,915
Net occupancy 8,747 6,165 24,517 18,993
Equipment and software 16,290 10,146 46,346 30,596
Miscellaneous taxes 4,933 3,162 14,225 9,398
Professional services 4,463 2,976 12,870 8,643
Marketing 2,970 2,955 7,166 7,189
FDIC insurance 5,820 3,604 15,487 10,576
Supplies 2,403 1,477 6,125 4,381
Telecommunications 1,533 1,106 4,284 3,678
General administration 2,543 1,379 6,160 4,303
Merger-related and restructuring 11,395 52 65,387 3,830
Amortization of intangibles 8,385 2,005 21,385 6,073
Other segment items 3,240 4,313 12,796 14,208
Segment profit (loss) before provision for income taxes 108,994 50,000 184,121 135,108
Provision for income taxes 20,979 8,761 36,794 23,957
Net income 88,015 41,239 147,327 111,151
Trust and Investment Services [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Less: Interest expense 2,078 982 4,512 3,055
NET INTEREST INCOME (2,078) (982) (4,512) (3,055)
Net interest income after provision for credit losses (2,078) (982) (4,512) (3,055)
Non-interest income:        
Trust fees 6,955 5,467 21,327 16,854
WesMark fees 2,032 2,050 6,015 6,048
Other income 284   1,044  
Total revenues 7,193 6,535 23,874 19,847
Less :        
Salaries and wages 2,222 1,838 6,354 5,484
Employee benefits 487 424 1,517 1,369
Net occupancy 72 61 199 165
Equipment and software 20 11 154 26
Miscellaneous taxes 1 2 4 5
Professional services 223 197 527 355
Marketing 9 22 59 44
Supplies 41 27 135 95
General administration 46 23 128 96
Amortization of intangibles 40 48 468 144
Corporate overhead expenses 1,747 1,416 5,348 4,315
Other segment items 183 42 264 152
Segment profit (loss) before provision for income taxes 2,102 2,424 8,717 7,597
Provision for income taxes 441 509 1,830 1,595
Net income 1,661 1,915 6,887 6,002
Corporate Other [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Less: Interest expense 5,336 4,069 14,774 12,188
NET INTEREST INCOME (5,336) (4,069) (14,774) (12,188)
Net interest income after provision for credit losses (5,336) (4,069) (14,774) (12,188)
Non-interest income:        
Other income 11   28  
Total revenues (5,325) (4,069) (14,746) (12,188)
Less :        
Professional services 2,116 1,513 5,658 5,283
General administration 348 101 765 169
Merger-related and restructuring (12) 1,925 7,062 1,925
Other segment items 9 43 (11) (37)
Segment profit (loss) before provision for income taxes (7,786) (7,651) (28,220) (19,528)
Provision for income taxes (1,683) (1,769) (6,001) (4,256)
Net income $ (6,103) $ (5,882) $ (22,219) $ (15,272)