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FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Schedule of Book Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets:
Investment securities available-for-sale	$ 3,737,119	$ 3,846,537
Stock in FHLB of Pittsburgh	17,497	15,398
Accrued interest receivable	87,360	85,979
Financial liabilities:
Deposits	16,427,031	16,474,086
Accrued interest payable	73,418	46,684
Level 1 | Book Value
Financial assets:
Cash, cash equivalents, and restricted cash	990,918	1,092,900
Level 1 | Fair Value
Financial assets:
Cash, cash equivalents, and restricted cash	990,918	1,092,900
Level 2 | Book Value
Financial assets:
Investment securities available-for-sale	3,737,119	3,846,537
Investment securities held-to-maturity, net	1,026,305	1,058,557
Loans, held for sale	42,121	29,268
Stock in FHLB of Pittsburgh	17,497	15,398
Accrued interest receivable	87,360	85,979
Financial liabilities:
Deposits	16,427,031	16,474,086
Borrowed funds	1,075,161	895,076
Accrued interest payable	73,418	46,684
Level 2 | Fair Value
Financial assets:
Investment securities available-for-sale	3,737,119	3,846,537
Investment securities held-to-maturity, net	958,969	985,931
Loans, held for sale	42,121	29,268
Stock in FHLB of Pittsburgh	17,497	15,398
Accrued interest receivable	87,360	85,979
Financial liabilities:
Deposits	16,418,398	16,449,198
Borrowed funds	1,093,335	912,760
Accrued interest payable	73,418	46,684
Level 3 | Book Value
Financial assets:
Other investments	16,976	17,434
Loans and leases, net	13,124,684	12,583,202
Financial liabilities:
Standby letters of credit	675	814
Level 3 | Fair Value
Financial assets:
Other investments	16,976	17,434
Loans and leases, net	13,360,280	12,514,431
Financial liabilities:
Standby letters of credit	675	814
Levels 2, 3 | Book Value
Financial assets:
Other assets	166,395	153,647
Financial liabilities:
Other liabilities	141,305	151,642
Levels 2, 3 | Fair Value
Financial assets:
Other assets	166,395	153,647
Financial liabilities:
Other liabilities	$ 141,305	$ 151,642

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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