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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Apr. 30, 2004
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
Servicing Liabilities At Fair Value [Line Items]                    
Gain on early extinguishment of debt     $ 0 $ 0 $ 0 $ 1,605        
Servicing Asset at Amortized Cost $ 25,403   25,403 27,601 25,403 27,601 $ 26,941 $ 25,952 $ 28,034 $ 29,037
Servicing Asset At Fair Value Amount $ 42,416   $ 42,416   $ 42,416   $ 45,244      
Weighted-average yield 1.26%   1.26%   1.26%   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 $ 526   $ 526 465 $ 526 465 $ 511 549 433 458
Junior subordinated debentures 111,700   111,700   111,700   161,700      
Parent Company [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Gain on early extinguishment of debt     0 0 0 1,605        
Junior subordinated debentures 111,700   111,700   111,700   $ 161,700      
Statutory Trust One [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Trust preferred securities repurchased           21,400        
Gain on early extinguishment of debt           1,600        
Statutory Trust Two [Member] | Parent Company [Member] | Trust Preferred Securities [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Trust preferred securities repurchased $ 48,500                  
Trust preferred purchase price percent 42.00%                  
Interest in Trust Preferred Securities $ 1,500   1,500   1,500          
Trust preferred securities redemption call price percent 100.00%                  
Repurchased face amount $ 50,000   50,000   $ 50,000          
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                
Junior subordinated debentures $ 111,700   $ 111,700   $ 111,700   $ 161,700      
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 1.54%   1.54%   1.54%   1.55%      
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 176   $ 176   $ 176   $ 116      
Residential MBS [Member] | Private label [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Weighted-average yield 6.92%   6.92%   6.92%          
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 176   $ 176   $ 176   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%          
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 6,300   6,300   $ 6,300   7,100      
Servicing Asset At Fair Value Amount $ 4,300   $ 4,300   $ 4,300   $ 4,800      
Weighted-average yield 6.92%   6.92%   6.92%   7.66%      
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 176   $ 176 $ 83 $ 176 $ 83 $ 116 $ 163 $ 83 $ 83
GNMA [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Principal amount of corporation serviced loans securitized through GNMA $ 2,100,000   $ 2,100,000   $ 2,100,000