v3.26.1
Business Combination and Asset Purchase - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jan. 01, 2019
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2020
Dec. 31, 2025
Business Acquisition [Line Items]          
Goodwill   $ 86,358     $ 86,358
Amortization expense   548 $ 828    
Core Deposits [Member]          
Business Acquisition [Line Items]          
Amortization expense   548 828    
Amortization expense for 2026   1,096      
Customer Lists [Member]          
Business Acquisition [Line Items]          
Amortization expense   61 $ 61    
Peoples Federal Savings and Loan [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Recognition of core deposit tangible asset with acquired purchase   6,000      
Amortization expense for 2026   861      
Perpetual Federal Savings Bank in 2021 and 2022 [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Amortization expense for 2026   95      
Ossian State Bank [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Recognition of core deposit tangible asset with acquired purchase   980      
Ossian Financial Services, Inc. [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Amortization expense for 2026   $ 140      
Bank of Geneva [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Remaining economic useful life   7 years      
Amortization expense $ 280        
Perpetual Federal Savings Bank [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Recognition of core deposit tangible asset with acquired purchase   $ 668      
Adams County Financial Resources [Member] | Customer Lists [Member]          
Business Acquisition [Line Items]          
Recognition of core deposit intangible asset with acquired purchase       $ 800  
Remaining economic useful life       6 years 6 months  
Amortization expense for 2026   $ 123