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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)

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