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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2004
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Servicing Liabilities At Fair Value [Line Items]          
Servicing Asset at Amortized Cost   $ 26,355 $ 26,941 $ 28,431 $ 29,037
Servicing Asset At Fair Value Amount   $ 44,764 $ 45,244    
Weighted-average yield   1.25% 1.24%    
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   $ 442 $ 511 449 458
Junior subordinated debentures   $ 161,700 $ 161,700    
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] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Spread on variable rate   0.26161%      
Debt Instrument Description Of Variable Rate Basis   3-month CME Term SOFR      
Junior Subordinated Debt [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Statutory Trust One [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Spread on variable rate   2.75% 2.75%    
Junior Subordinated Debt [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Statutory Trust Two [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Spread on variable rate   2.50% 2.50%    
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        
Variable Rate Demand Obligation [Member] | Junior Subordinated Debt [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Debt Instrument, Maturity Date, Description   The Junior Subordinated Deferrable Debentures mature on June 17, 2034, and September 20, 2034, respectively; however, under certain circumstances, the maturity of Junior Subordinated Deferrable Debentures may be shortened (such shortening would result in a mandatory redemption of the variable-rate TRuPs).      
Residential MBS [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Weighted-average yield   1.55% 1.55%    
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 116 $ 116    
Residential MBS [Member] | Private label [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Weighted-average yield   7.63%      
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 100 $ 100    
Residential MBS [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Private label [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Spread on variable rate   0.26161% 0.26161%    
Debt Instrument Description Of Variable Rate Basis   3-month CME Term SOFR      
Residential MBS [Member] | Private label [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Servicing Asset at Amortized Cost   $ 6,900      
Servicing Asset At Fair Value Amount   4,700      
Debt Securities, Available-for-sale, Allowance for Credit Loss   116 $ 116 $ 83 $ 83
GNMA [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Principal amount of corporation serviced loans securitized through GNMA   $ 2,100,000