Annual report [Section 13 and 15(d), not S-K Item 405]

Borrowings - Narrative (Details)

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Borrowings - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Line of Credit Facility [Line Items]    
Other borrowings $ 0 $ 0
Mortgage loans carrying value $ 380,700,000  
Puttable option to call advances earliest 6 months  
Puttable option to call advances earliest latest 12 months  
Bank available credit lines $ 673,900,000  
Federal funds purchased and repurchase agreements 39,703,000 40,116,000
Asset Pledged as Collateral    
Line of Credit Facility [Line Items]    
Financial instruments, owned, at fair value 315,500,000 $ 326,500,000
Federal Home Loan Bank Advances    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 25,000,000.0  
Federal Home Loan Bank Advances | Asset Pledged as Collateral    
Line of Credit Facility [Line Items]    
Financial instruments, owned, at fair value $ 876,000,000.0