DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Asset Derivatives	$ 114,541	$ 93,036
Liability Derivatives	114,014	92,770
Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	1,398,799	1,204,321
Fair Value
Asset Derivatives	114,541	92,872
Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	1,365,918	1,196,898
Fair Value
Liability Derivatives	114,014	92,770
Interest rate swaps | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	1,321,737	1,184,866
Fair Value
Asset Derivatives	113,691	92,652
Interest rate swaps | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	1,321,737	1,184,866
Fair Value
Liability Derivatives	113,740	92,652
Forward contracts related to mortgage loans to be delivered for sale | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	66,301	14,406
Fair Value
Asset Derivatives	768	188
Forward contracts related to mortgage loans to be delivered for sale | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	14,847	4,483
Fair Value
Liability Derivatives	36	63
Interest rate lock commitments | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	10,761	5,049
Fair Value
Asset Derivatives	82	32
Interest rate lock commitments | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	29,334	7,549
Fair Value
Liability Derivatives	$ 238	$ 55