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Business Combination & Asset Purchase - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2022
USD ($)
Office
$ / shares
shares
Oct. 01, 2021
USD ($)
Office
$ / shares
shares
Apr. 30, 2021
USD ($)
Office
$ / shares
shares
Nov. 16, 2020
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Nov. 30, 2020
USD ($)
Client
Business Acquisition [Line Items]                  
Common stock, shares outstanding | shares           13,699,536 13,664,641    
Goodwill           $ 86,358 $ 86,358    
Amortization expense           1,657 1,657 $ 1,011  
Customer Lists [Member]                  
Business Acquisition [Line Items]                  
Amortization expense           123 123 123  
Peoples Federal Savings and Loan [Member]                  
Business Acquisition [Line Items]                  
Number of full-service offices | Office 3                
Common stock issued in exchange of each outstanding share 0.6597                
Cash payment for exchange of each share | $ / shares $ 24                
Minimum number of shares to be exchanged under merger agreement | shares 758,566                
Common stock, shares outstanding | shares 1,167,025                
Share price | $ / shares $ 26.87                
Total consideration for acquisition $ 23,249                
Cash paid for the capital stock 9,806         0 0 9,806  
Stock issued for acquisition 13,446                
Business combination, acquisition related costs             200 $ 2,400  
Goodwill $ 5,924                
Fair value of assets acquired   $ 101,800              
Gross principal and contractual interest   116,100              
Acquisition expected to be uncollectible   $ 0              
Loan receivable weighted average life 44 months 12 days                
Business combination, premises and equipment written up value $ 581                
Business combination, premises and equipment written down value         $ 597        
Business combination, average remaining life               12 years 9 months 18 days  
Fair value for certificate of deposit, valuation amount $ 662                
Fair value for certificate of deposit, amortization period 1 year 1 month 6 days                
Fair value of Federal Home Loan Bank (FHLB) advances, valuation amount $ 69                
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period 5 years 2 months 12 days                
Peoples Federal Savings and Loan [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Recognition of core deposit intangible asset with acquired purchase $ 6,000                
Recognition of core deposit tangible asset with acquired purchase           6,000      
Remaining economic useful life 7 years                
Peoples Federal Savings and Loan [Member] | Data Processing [Member]                  
Business Acquisition [Line Items]                  
Business combination, acquisition related costs             13 $ 1,100  
Peoples Federal Savings and Loan [Member] | Consulting Fees [Member]                  
Business Acquisition [Line Items]                  
Business combination, acquisition related costs             5 543  
Peoples Federal Savings and Loan [Member] | Employee Benefits [Member]                  
Business Acquisition [Line Items]                  
Business combination, acquisition related costs             137 127  
Peoples Federal Savings and Loan [Member] | Other General and Administrative Expenses [Member]                  
Business Acquisition [Line Items]                  
Business combination, acquisition related costs             $ 45 $ 501  
Perpetual Federal Savings Bank [Member]                  
Business Acquisition [Line Items]                  
Number of full-service offices | Office   1              
Common stock issued in exchange of each outstanding share   1.7766              
Cash payment for exchange of each share | $ / shares   $ 41.2              
Business acquisition share owned subject to adjustment | shares   1,833,999              
Common stock, shares outstanding | shares   2,470,032              
Share price | $ / shares   $ 22.4              
Total consideration for acquisition   $ 100,300              
Cash paid for the capital stock   59,200              
Stock issued for acquisition   41,100              
Goodwill   25,200              
Common stock issued in exchange of each outstanding share | shares 500,426                
Perpetual Federal Savings Bank [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Recognition of core deposit intangible asset with acquired purchase   $ 668              
Recognition of core deposit tangible asset with acquired purchase           668      
Remaining economic useful life   7 years              
Ossian State Bank [Member]                  
Business Acquisition [Line Items]                  
Number of full-service offices | Office     2            
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]                  
Business Acquisition [Line Items]                  
Cash payment for exchange of each share | $ / shares     $ 67.71            
Common stock, shares outstanding | shares     295,388            
Total consideration for acquisition     $ 20,000            
Goodwill     $ 7,900            
Goodwill deductible for tax purpose, period     15 years            
Ossian Financial Services, Inc. [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Recognition of core deposit intangible asset with acquired purchase     $ 980            
Remaining economic useful life     7 years            
Bank of Geneva [Member] | Core Deposits [Member]                  
Business Acquisition [Line Items]                  
Recognition of core deposit intangible asset with acquired purchase           $ 3,900      
Remaining economic useful life           7 years      
Adams County Financial Resources [Member]                  
Business Acquisition [Line Items]                  
Total consideration for acquisition       $ 825          
Common stock issued in exchange of each outstanding share | shares       40,049          
Assets under management amount                 $ 83,000
Number of clients assets under management | Client                 450
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