FAIR VALUE MEASUREMENTS - Schedule of Estimated Non-recurring Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial Assets
Trading security	$ 6,100	$ 6,700
Marketable equity securities	13,029	12,856
Securities available for sale, at fair value	1,022,285	1,423,200
Securities held to maturity	476,228	507,464
FHLB stock and restricted equity securities	22,689	7,219
Accrued interest receivable	53,096	46,868
Financial Liabilities
Accrued interest payable	13,766	1,610
Carrying Amount
Financial Assets
Cash and cash equivalents	1,203,244	685,355
Trading security	6,142	6,708
Marketable equity securities	13,029	12,856
Securities available for sale, at fair value	1,022,285	1,423,200
Securities held to maturity	543,351	583,453
FHLB stock and restricted equity securities	22,689	7,219
Net loans	8,934,329	8,239,039
Loans held for sale	2,237	4,311
Accrued interest receivable	53,096	46,868
Derivative assets	45,668	54,241
Financial Liabilities
Total deposits	10,633,384	10,327,269
Short-term debt	260,000	0
Long-term FHLB advances	125,223	4,445
Subordinated notes	121,363	121,064
Accrued interest payable	13,766	1,610
Derivative liabilities	75,957	97,030
Fair Value
Financial Assets
Cash and cash equivalents	1,203,244	685,355
Trading security	6,142	6,708
Marketable equity securities	13,029	12,856
Securities available for sale, at fair value	1,022,285	1,423,200
Securities held to maturity	476,228	507,464
Net loans	8,768,108	8,194,110
Loans held for sale	2,237	4,311
Accrued interest receivable	53,096	46,868
Derivative assets	45,668	54,241
Financial Liabilities
Total deposits	10,615,655	10,283,543
Short-term debt	260,035	0
Long-term FHLB advances	123,747	2,782
Subordinated notes	98,138	110,853
Accrued interest payable	13,766	1,610
Derivative liabilities	75,957	97,030
Level 1
Financial Assets
Cash and cash equivalents	1,203,244	685,355
Trading security	0	0
Marketable equity securities	13,029	12,856
Securities available for sale, at fair value	7,981	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 FHLB advances	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Derivative liabilities	0	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading security	0	0
Marketable equity securities	0	0
Securities available for sale, at fair value	1,010,381	1,407,227
Securities held to maturity	474,742	505,508
Net loans	0	0
Loans held for sale	2,237	942
Accrued interest receivable	53,096	46,868
Derivative assets	45,613	54,216
Financial Liabilities
Total deposits	10,615,655	10,283,543
Short-term debt	260,035	0
Long-term FHLB advances	123,747	2,782
Subordinated notes	98,138	110,853
Accrued interest payable	13,766	1,610
Derivative liabilities	75,957	97,030
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading security	6,142	6,708
Marketable equity securities	0	0
Securities available for sale, at fair value	3,923	4,000
Securities held to maturity	1,486	1,956
Net loans	8,768,108	8,194,110
Loans held for sale	0	3,369
Accrued interest receivable	0	0
Derivative assets	55	25
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term FHLB advances	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Derivative liabilities	$ 0	$ 0