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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Servicing Liabilities At Fair Value [Line Items]
Servicing Asset at Amortized Cost	$ 23,659	$ 25,019	$ 24,130	$ 25,403	$ 25,952	$ 26,941
Servicing Asset At Fair Value Amount	$ 41,710	43,046
Percentage Of Variation In Assumptions	10.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information	These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10% variation in assumptions generally cannot be extrapolated because the relationship between the change in assumption and the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption on the fair value of the MSR is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments), which may magnify or counteract the sensitivities
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 658	521	513	526	549	511
Junior subordinated debentures (amortized cost)	0	61,700
Parent Company [Member]
Servicing Liabilities At Fair Value [Line Items]
Junior subordinated debentures (amortized cost)	$ 0	61,700
Minimum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage Of Variation In Assumptions	10.00%
Maximum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage Of Variation In Assumptions	20.00%
Junior Subordinated Debt [Member] | Parent Company [Member] | Trust Preferred Securities [Member]
Servicing Liabilities At Fair Value [Line Items]
Trust preferred securities redemption call price percent	100.00%
Repurchased face amount	$ 61,700
Variable Rate Demand Obligation [Member] | Statutory Trust One [Member]
Servicing Liabilities At Fair Value [Line Items]
Proceeds from Issuance of Trust Preferred Securities		100,000
Proceeds of the issuance, together with proceeds of the purchase		3,100
Principal amount of corporation's junior subordinated deferrable debentures		103,100
Variable Rate Demand Obligation [Member] | Statutory Trust Two [Member]
Servicing Liabilities At Fair Value [Line Items]
Proceeds from Issuance of Trust Preferred Securities		125,000
Proceeds of the issuance, together with proceeds of the purchase		3,900
Principal amount of corporation's junior subordinated deferrable debentures		128,900
Residential MBS [Member]
Servicing Liabilities At Fair Value [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	330	176
Residential MBS [Member] | Private label [Member]
Servicing Liabilities At Fair Value [Line Items]
Servicing Asset at Amortized Cost	5,300	6,100
Servicing Asset At Fair Value Amount	3,300	4,200
Debt Securities, Available-for-sale, Allowance for Credit Loss	330	$ 176	$ 176	$ 176	$ 163	$ 116
GNMA [Member]
Servicing Liabilities At Fair Value [Line Items]
Principal amount of corporation serviced loans securitized through GNMA	$ 2,100,000

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