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REGULATORY MATTERS - Schedule of Capital Ratios (Details) $ in Millions | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital, actual amount | $ 4,971 | $ 4,635
Tier 1 capital, actual amount | 4,317 | 3,971
Common equity tier 1, actual amount | 4,317 | 3,971
Leverage, actual amount | 4,317 | 3,971
Risk weighted assets, actual amount | $ 37,991 | $ 37,546
Total capital, actual ratio | 0.1308 | 0.1235
Total capital, tier 1 capital, actual ratio | 0.1136 | 0.1058
Common equity tier 1, actual ratio | 0.1136 | 0.1058
Leverage, actual ratio | 0.0911 | 0.0875
Total capital, well-capitalized requirements amount | $ 3,799 | $ 3,755
Tier 1 capital, well-capitalized requirements amount | $ 2,279 | $ 2,253
Total capital, well-capitalized requirements ratio | 0.1000 | 0.1000
Tier 1 capital, well-capitalized requirements ratio | 0.0600 | 0.0600
Total capital, minimum capital requirements plus capital conservation buffer amount | $ 3,989 | $ 3,942
Tier 1 capital, minimum capital requirements plus capital conservation buffer amount | 3,229 | 3,191
Common equity tier 1, minimum capital requirements plus capital conservation buffer amount | 2,659 | 2,628
Leverage, minimum capital requirements plus capital conservation buffer amount | $ 1,896 | $ 1,816
Total capital, minimum capital requirements plus capital conservation buffer ratio | 0.1050 | 0.1050
Tier 1 capital, minimum capital requirements plus capital conservation buffer ratio | 0.0850 | 0.0850
Common equity tier 1, minimum capital requirements plus capital conservation buffer ratio | 0.0700 | 0.0700
Leverage, minimum capital requirements plus capital conservation buffer ratio | 0.0400 | 0.0400
FNBPA |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital, actual amount | $ 5,188 | $ 4,794
Tier 1 capital, actual amount | 4,371 | 3,962
Common equity tier 1, actual amount | 4,291 | 3,882
Leverage, actual amount | 4,371 | 3,962
Risk weighted assets, actual amount | $ 37,743 | $ 37,280
Total capital, actual ratio | 0.1375 | 0.1286
Total capital, tier 1 capital, actual ratio | 0.1158 | 0.1063
Common equity tier 1, actual ratio | 0.1137 | 0.1041
Leverage, actual ratio | 0.0927 | 0.0878
Total capital, well-capitalized requirements amount | $ 3,774 | $ 3,728
Tier 1 capital, well-capitalized requirements amount | 3,019 | 2,982
Common equity tier 1, well-capitalized requirements amount | 2,453 | 2,423
Leverage, well-capitalized requirements amount | $ 2,357 | $ 2,257
Total capital, well-capitalized requirements ratio | 0.1000 | 0.1000
Tier 1 capital, well-capitalized requirements ratio | 0.0800 | 0.0800
Common equity tier 1, well-capitalized requirements ratio | 0.0650 | 0.0650
Leverage, well-capitalized requirements ratio | 0.0500 | 0.0500
Total capital, minimum capital requirements plus capital conservation buffer amount | $ 3,963 | $ 3,914
Tier 1 capital, minimum capital requirements plus capital conservation buffer amount | 3,208 | 3,169
Common equity tier 1, minimum capital requirements plus capital conservation buffer amount | 2,642 | 2,610
Leverage, minimum capital requirements plus capital conservation buffer amount | $ 1,885 | $ 1,806
Total capital, minimum capital requirements plus capital conservation buffer ratio | 0.1050 | 0.1050
Tier 1 capital, minimum capital requirements plus capital conservation buffer ratio | 0.0850 | 0.0850
Common equity tier 1, minimum capital requirements plus capital conservation buffer ratio | 0.0700 | 0.0700
Leverage, minimum capital requirements plus capital conservation buffer ratio | 0.0400 | 0.0400

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