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Junior Subordinated Debt - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Class of Stock [Line Items]    
Junior subordinated debt $ 41,238 $ 101,191
Subordinated debt    
Class of Stock [Line Items]    
Face Value 41,238  
Junior subordinated debt $ 41,238 101,191
VRB Subordinated - 5% | Subordinated debt    
Class of Stock [Line Items]    
Interest rate 5.00%  
Face Value $ 0  
Junior subordinated debt 0 $ 25,007
North Valley Trust II, III, IV and VRB Subordinated and Subordinated Debt | Subordinated debt    
Class of Stock [Line Items]    
Face Value 57,700  
Junior subordinated debt 60,200  
Gain on extinguishment of debt $ 2,500