v3.26.1
FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Schedule of Book Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial assets:    
Investment securities available-for-sale $ 3,841,008 $ 3,542,246
Stock in FHLB of Pittsburgh 24,361 10,194
Accrued interest receivable 78,076 80,285
Financial liabilities:    
Deposits 19,003,635 17,642,488
Accrued interest payable 16,229 19,646
Other liabilities 120,554 125,861
Level 1    
Financial liabilities:    
Other liabilities 0 0
Level 1 | Book Value    
Financial assets:    
Cash, cash equivalents, and restricted cash 2,570,636 1,699,154
Level 1 | Fair Value    
Financial assets:    
Cash, cash equivalents, and restricted cash 2,570,636 1,699,154
Level 2    
Financial liabilities:    
Other liabilities 117,259 120,432
Level 2 | Book Value    
Financial assets:    
Investment securities available-for-sale 3,841,008 3,542,246
Investment securities held-to-maturity, net 943,292 968,331
Loans, held for sale 33,926 61,573
Stock in FHLB of Pittsburgh 24,361 10,194
Accrued interest receivable 78,076 80,285
Financial liabilities:    
Deposits 19,003,635 17,642,488
Borrowed funds 307,017 302,682
Accrued interest payable 16,229 19,646
Level 2 | Fair Value    
Financial assets:    
Investment securities available-for-sale 3,841,008 3,542,246
Investment securities held-to-maturity, net 845,831 879,066
Loans, held for sale 33,926 61,573
Stock in FHLB of Pittsburgh 24,361 10,194
Accrued interest receivable 78,076 80,285
Financial liabilities:    
Deposits 18,988,879 17,631,304
Borrowed funds 290,911 288,470
Accrued interest payable 16,229 19,646
Level 3    
Financial assets:    
Other investments 6,472 11,090
Other assets 54 80
Financial liabilities:    
Other liabilities 3,295 5,429
Level 3 | Book Value    
Financial assets:    
Other investments 8,877 13,441
Loans and leases, net 13,289,859 13,082,027
Financial liabilities:    
Standby letters of credit 892 766
Level 3 | Fair Value    
Financial assets:    
Other investments 8,877 13,441
Loans and leases, net 13,267,874 13,171,197
Financial liabilities:    
Standby letters of credit 892 766
Levels 2, 3 | Book Value    
Financial assets:    
Other assets 129,592 145,505
Financial liabilities:    
Other liabilities 120,554 125,861
Levels 2, 3 | Fair Value    
Financial assets:    
Other assets 129,592 145,505
Financial liabilities:    
Other liabilities $ 120,554 $ 125,861