v3.26.3
Junior Subordinated Interest Deferrable Debentures - Key Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Junior subordinated interest deferrable debentures, major types of business trusts    
Junior subordinated deferrable interest debentures $ 108,868,000 $ 108,868,000
Trust IX    
Junior subordinated interest deferrable debentures, major types of business trusts    
Junior subordinated deferrable interest debentures $ 41,238,000  
Interest rate (as a percent) 5.61%  
Interest rate index SOFR  
Spread on interest rate index (as a percent) 1.62%  
Trust X    
Junior subordinated interest deferrable debentures, major types of business trusts    
Junior subordinated deferrable interest debentures $ 21,021,000  
Interest rate (as a percent) 5.72%  
Interest rate index SOFR  
Spread on interest rate index (as a percent) 1.65%  
Trust XI    
Junior subordinated interest deferrable debentures, major types of business trusts    
Junior subordinated deferrable interest debentures $ 25,990,000  
Interest rate (as a percent) 5.61%  
Interest rate index SOFR  
Spread on interest rate index (as a percent) 1.62%  
Trust XII    
Junior subordinated interest deferrable debentures, major types of business trusts    
Junior subordinated deferrable interest debentures $ 20,619,000  
Interest rate (as a percent) 5.47%  
Interest rate index SOFR  
Spread on interest rate index (as a percent) 1.45%