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Loans, Leases and Allowance - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
segment
Dec. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Loans and Leases Receivable Disclosure [Line Items]      
Interest income on nonaccrual loans and leases $ 1 $ 3  
Foreclosed residential real estate with physical possession 56 56 $ 56
Consumer mortgage loans secured by residential real estate properties in process of foreclosure $ 1,055 923 923
Number of loan portfolio segments | segment 8    
Allowance for credit loss, period increase (decrease) $ 16,700 $ 16,500 $ 16,500
Financing receivable, excluding accrued interest, provision for net amount 621    
Financing receivable, excluding accrued interest, net charge-offs 347    
Commercial and industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit loss, period increase (decrease) (2,700)    
Construction and development      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit loss, period increase (decrease) (2,600)    
Home equity lines of credit      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit loss, period increase (decrease) (1,300)    
Multi-Family      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit loss, period increase (decrease) 860    
Commercial Loan Portfolio | Indianapolis, Indiana      
Loans and Leases Receivable Disclosure [Line Items]      
Downtown capital projects $ 6,000,000    
Commercial Loan Portfolio | Financing Receivable | Portfolio Segment Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Concentration risk (as a percent) 70.70%   70.20%
Commercial Loan Portfolio | Allowance for Credit Losses | Portfolio Segment Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Concentration risk (as a percent) 68.20%   66.90%