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FAIR VALUE MEASUREMENTS - Schedule of Estimated Non-recurring Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial Assets
Trading securities	$ 6,600	$ 6,700
Equity securities	13,072	12,856
Securities available for sale, at fair value	1,407,271	1,423,200
Securities held to maturity	507,091	507,464
Carrying Amount
Financial Assets
Cash and cash equivalents	1,006,562	685,355
Trading securities	6,584	6,708
Equity securities	13,072	12,856
Securities available for sale, at fair value	1,407,271	1,423,200
Securities held to maturity	574,606	583,453
Federal Home Loan Bank stock	44,245	7,219
Net loans	8,583,976	8,239,039
Loans held for sale	1,906	4,311
Accrued interest receivable	49,464	46,868
Derivative assets	43,656	54,241
Financial Liabilities
Total deposits	10,067,545	10,327,269
Short-term debt	900,000	0
Long-term Federal Home Loan Bank advances and other	4,395	4,445
Subordinated borrowings	121,176	121,064
Derivative liabilities	73,909	97,030
Fair Value
Financial Assets
Cash and cash equivalents	1,006,562	685,355
Trading securities	6,584	6,708
Equity securities	13,072	12,856
Securities available for sale, at fair value	1,407,271	1,423,200
Securities held to maturity	507,091	507,464
Net loans	8,553,066	8,194,110
Loans held for sale	1,906	4,311
Accrued interest receivable	49,464	46,868
Derivative assets	43,656	54,241
Financial Liabilities
Total deposits	10,034,068	10,283,543
Short-term debt	900,141	0
Long-term Federal Home Loan Bank advances and other	2,895	2,782
Subordinated borrowings	97,742	110,853
Derivative liabilities	73,909	97,030
Level 1
Financial Assets
Cash and cash equivalents	1,006,562	685,355
Trading securities	0	0
Equity securities	13,072	12,856
Securities available for sale, at fair value	8,981	11,973
Securities held to maturity	0	0
Net loans	0	0
Loans held for sale	0	0
Accrued interest receivable	0	0
Derivative assets	0	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	0	0
Subordinated borrowings	0	0
Derivative liabilities	0	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading securities	0	0
Equity securities	0	0
Securities available for sale, at fair value	1,394,490	1,407,227
Securities held to maturity	505,357	505,508
Net loans	0	0
Loans held for sale	1,906	942
Accrued interest receivable	49,464	46,868
Derivative assets	43,615	54,216
Financial Liabilities
Total deposits	10,034,068	10,283,543
Short-term debt	900,141	0
Long-term Federal Home Loan Bank advances and other	2,895	2,782
Subordinated borrowings	97,742	110,853
Derivative liabilities	73,909	97,030
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading securities	6,584	6,708
Equity securities	0	0
Securities available for sale, at fair value	3,800	4,000
Securities held to maturity	1,734	1,956
Net loans	8,553,066	8,194,110
Loans held for sale	0	3,369
Accrued interest receivable	0	0
Derivative assets	41	25
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	0	0
Subordinated borrowings	0	0
Derivative liabilities	$ 0	$ 0

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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