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Derivative and Hedging Activities - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 06, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2022
USD ($)
Interest
Jun. 30, 2022
USD ($)
Interest
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2022
USD ($)
Interest
Mar. 31, 2023
USD ($)
Derivative [Line Items]                    
Cash collateral pledged   $ 2,500,000       $ 2,500,000   $ 0    
Pay Floating Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]                    
Derivative [Line Items]                    
Derivative, number of instruments held | Interest         2          
Derivative, notional amount         $ 200,000,000          
Derivative, fixed coupon rate         2.41%          
Derivative instrument cash payment                   $ 4,200,000
Interest income reduced               1,100,000    
Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member]                    
Derivative [Line Items]                    
Sale of interest rate swaps $ 50,000,000         50,000,000        
Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]                    
Derivative [Line Items]                    
Derivative, number of instruments held | Interest         1          
Derivative, notional amount       $ 49,100,000 $ 200,000,000       $ 49,100,000  
Derivative, fixed coupon rate         2.75%          
Derivative, Term of Contract (Year)         8 years       9 years  
Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]                    
Derivative [Line Items]                    
Derivative Instruments, Net settlements received   608,000 $ 1,300,000     1,900,000 $ 2,300,000      
Increase (decrease) in interest expense   126,000       337,000        
Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                    
Derivative [Line Items]                    
Derivative, Basis Spread on Variable Rate       3.403%         3.403%  
Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]                    
Derivative [Line Items]                    
Derivative, number of instruments held | Interest       4         4  
Derivative, notional amount   $ 30,400,000   $ 201,000,000   $ 30,400,000     $ 201,000,000  
Derivative, fixed coupon rate   3.52%       3.52%        
Derivative Instruments, Net settlements received   $ 510,000 1,000,000     $ 1,500,000 3,000,000      
Derivative, contract maturity year   2040                
Pay Fixed Swap Agreements Expiring in 2032 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]                    
Derivative [Line Items]                    
Derivative, notional amount       $ 101,900,000         $ 101,900,000  
Derivative, Term of Contract (Year)       10 years            
Pay Fixed Swap Agreements Expiring in 2032 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                    
Derivative [Line Items]                    
Derivative, Basis Spread on Variable Rate       3.39%         3.39%  
The 3.4015 Percent Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]                    
Derivative [Line Items]                    
Derivative, notional amount       $ 50,000,000         $ 50,000,000  
Derivative, Term of Contract (Year)       9 years            
The 3.4015 Percent Pay Fixed Swap Agreement [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                    
Derivative [Line Items]                    
Derivative, Basis Spread on Variable Rate       3.4015%         3.4015%  
Interest Rate Swaps [Member]                    
Derivative [Line Items]                    
Derivative, notional amount   $ 85,000,000       85,000,000   56,500,000    
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]                    
Derivative [Line Items]                    
Derivative, notional amount   $ 381,300,000       $ 381,300,000   $ 401,000,000    
Derivative weighted average coupon rate   3.15%       3.15%   3.07%    
Derivative, Term of Contract (Year)           7 years 2 months 12 days   7 years 4 months 24 days    
Fair value of interest rate swaps           $ 6,800,000   $ 23,600,000    
Gain on transaction $ 3,600,000                  
Remaining on the life of the swap 7 years                  
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]                    
Derivative [Line Items]                    
Sale of interest rate swaps   $ 1,300,000 $ 2,500,000     3,800,000 $ 4,300,000      
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Agency Mortgage Backed Securities [Member]                    
Derivative [Line Items]                    
Derivative, notional amount   40,600,000       40,600,000        
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]                    
Derivative [Line Items]                    
Fair Value   1,800,000       1,800,000   686,000    
Derivative liabilities   $ 1,800,000       $ 1,800,000   $ 686,000