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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 6 Months Ended 12 Months Ended
Apr. 30, 2004
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Jul. 22, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2022
Servicing Liabilities At Fair Value [Line Items]                    
Gain on early extinguishment of debt   $ 0 $ 1,605 $ 0 $ 1,605          
Servicing Asset at Amortized Cost   25,952 28,034 25,952 28,034 $ 26,941   $ 26,355 $ 28,431 $ 29,037
Servicing Asset At Fair Value Amount   $ 44,590   $ 44,590   $ 45,244        
Weighted-average yield   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   $ 549 433 $ 549 433 $ 511   442 449 458
Junior subordinated debentures   161,700   $ 161,700   $ 161,700        
Repurchase Program Announced July 22, 2024 [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Repurchase program authorized amount             $ 250,000      
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   $ 161,700   $ 161,700   $ 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   1.55%   1.55%   1.55%        
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 163   $ 163   $ 116        
Residential MBS [Member] | Private label [Member]                    
Servicing Liabilities At Fair Value [Line Items]                    
Weighted-average yield   7.65%   7.65%            
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 163   $ 163   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   6,700   $ 6,700            
Servicing Asset At Fair Value Amount   4,600   4,600            
Debt Securities, Available-for-sale, Allowance for Credit Loss   163 $ 83 163 $ 83 $ 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   $ 2,100,000