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Business Combination & Asset Purchase - Additional Information (Detail)
 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 ($)
shares
Jan. 01, 2019
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loan
shares
Sep. 30, 2021
Loan
Dec. 31, 2022
USD ($)
Loan
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Nov. 30, 2020
USD ($)
Client
Business Acquisition [Line Items]                        
Common stock, shares outstanding | shares             14,063,999   14,564,425 14,063,999    
Remaining economic useful life                 7 years      
Goodwill             $ 80,434,000   $ 86,358,000 $ 80,434,000    
Amortization expense                 1,011,000 677,000 $ 720,000  
Custar                        
Business Acquisition [Line Items]                        
Amortization expense                     160,000  
Customer Lists [Member]                        
Business Acquisition [Line Items]                        
Amortization expense                 123,000 123,000 16,000  
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 $ 24.00                      
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 $ 23,249,000                      
Cash paid for the capital stock 9,806,000               9,806,000      
Stock issued for acquisition 13,446,000                      
Business combination, acquisition related costs                 2,400,000      
Recognition of core deposit intangible asset with acquired purchase   $ 6,000,000.0                    
Goodwill 5,924,000                      
Fair value of assets acquired                 101,800,000      
Gross principal and contractual interest                 116,100,000      
Acquisition expected to be uncollectible                 $ 0      
Loan receivable weighted average life                 44 months 12 days      
Business combination, premises and equipment written up value                 $ 581,000      
Business combination, average remaining life                 12 years 9 months 18 days      
Fair value for certificate of deposit, valuation amount                 $ 662,000      
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                 $ 69,000      
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period                 5 years 2 months 12 days      
Acquisition expected to be uncollectible                 $ 0      
Peoples Federal Savings and Loan [Member] | Building [Member]                        
Business Acquisition [Line Items]                        
Business combination, premises and equipment written down value                 597,000      
Peoples Federal Savings and Loan [Member] | Core Deposits [Member]                        
Business Acquisition [Line Items]                        
Recognition of core deposit intangible asset with acquired purchase $ 6,000,000.0                      
Remaining economic useful life 7 years                      
Peoples Federal Savings and Loan [Member] | Data Processing [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 1,100,000      
Peoples Federal Savings and Loan [Member] | Consulting Fees [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 542,900      
Peoples Federal Savings and Loan [Member] | Employee Benefits [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 126,500      
Peoples Federal Savings and Loan [Member] | Other General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 501,000.0      
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   $ 41.20                    
Business acquisition share owned subject to adjustment | shares   1,833,999                    
Common stock, shares outstanding | shares   2,470,032                    
Share price | $ / shares   $ 22.40                    
Total consideration for acquisition   $ 100,312,000                    
Cash paid for the capital stock   59,234,000               59,234,000    
Stock issued for acquisition   41,078,000                    
Business combination, acquisition related costs                 148,500,000 1,700,000    
Goodwill   25,220,000                    
Fair value of assets acquired                 334,700,000      
Gross principal and contractual interest                 403,300,000      
Acquisition expected to be uncollectible                 $ 5,600,000      
Loan receivable weighted average life                 52 months      
Business combination, premises and equipment written down value                 $ 4,000      
Business combination, average remaining life                 16 years 2 months 12 days      
Fair value for certificate of deposit, valuation amount                 $ 3,900,000      
Fair value for certificate of deposit, amortization period                 1 year 7 months 6 days      
Fair value of Federal Home Loan Bank (FHLB) advances, valuation amount                 $ 218,000      
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period                 2 years 7 months 6 days      
Fair value adjustment of loans acquired and accounted   $ 237,200         $ 189,800   $ 127,700 189,800    
Number of commercial purchased credit impaired loans paid off | Loan             2          
Number of consumer purchased credit impaired loans paid off | Loan             1   5      
Discount recognized at acquisition related to commercial purchased credit-impaired loans             $ 47,400   $ 62,100      
Business acquisition, number of shares issued to purchase assets | shares 500,426 1,833,845                    
Acquisition expected to be uncollectible                 5,600,000      
Perpetual Federal Savings Bank [Member] | Building [Member]                        
Business Acquisition [Line Items]                        
Business combination, premises and equipment written down value                 297,000      
Perpetual Federal Savings Bank [Member] | Core Deposits [Member]                        
Business Acquisition [Line Items]                        
Recognition of core deposit intangible asset with acquired purchase   $ 668,000                    
Remaining economic useful life   7 years                    
Perpetual Federal Savings Bank [Member] | Data Processing [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   444,900    
Perpetual Federal Savings Bank [Member] | Consulting Fees [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   636,800    
Perpetual Federal Savings Bank [Member] | Employee Benefits [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 90,800 131,500    
Perpetual Federal Savings Bank [Member] | Other General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                 57,700 488,300    
Ossian State Bank [Member]                        
Business Acquisition [Line Items]                        
Number of full-service offices | Office     2                  
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     $ 20,001,000                  
Cash paid for the capital stock     20,001,000                  
Business combination, acquisition related costs                 31,600 2,200,000 42,500  
Goodwill     7,874,000                  
Fair value of assets acquired                 52,400,000      
Gross principal and contractual interest                 63,700,000      
Acquisition expected to be uncollectible                 $ 1,100,000      
Loan receivable weighted average life                 52 months      
Business combination, premises and equipment written down value                 $ 596,000      
Business combination, average remaining life                 39 years      
Fair value for certificate of deposit, valuation amount                 $ 59,000      
Fair value for certificate of deposit, amortization period                 1 year 4 months 24 days      
Fair value adjustment of loans acquired and accounted     $ 324,800       $ 320,600   $ 10,100 320,600    
Discount recognized at acquisition related to commercial purchased credit-impaired loans           $ 311,000       4,200    
Goodwill deductible for tax purpose, period     15 years                  
Number of agricultural real purchased credit impaired loans paid off | Loan               2        
Acquisition expected to be uncollectible                 1,100,000      
Ossian Financial Services, Inc. [Member] | Building [Member]                        
Business Acquisition [Line Items]                        
Business combination, premises and equipment written down value                 $ 244,000      
Ossian Financial Services, Inc. [Member] | Core Deposits [Member]                        
Business Acquisition [Line Items]                        
Recognition of core deposit intangible asset with acquired purchase     $ 980,200                  
Remaining economic useful life     7 years                  
Ossian Financial Services, Inc. [Member] | Data Processing [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   938,900    
Ossian Financial Services, Inc. [Member] | Consulting Fees [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   255,200 12,500  
Ossian Financial Services, Inc. [Member] | Employee Benefits [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   694,100    
Ossian Financial Services, Inc. [Member] | ATM Expense [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   13,800    
Ossian Financial Services, Inc. [Member] | Other General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Business combination, acquisition related costs                   $ 255,000.0 $ 30,000.0  
Bank of Geneva [Member] | Core Deposits [Member]                        
Business Acquisition [Line Items]                        
Recognition of core deposit intangible asset with acquired purchase         $ 3,900,000              
Adams County Financial Resources [Member]                        
Business Acquisition [Line Items]                        
Total consideration for acquisition       $ 825,000                
Stock issued for acquisition       $ 825,000                
Business acquisition, number of shares issued to purchase assets | shares       40,049                
Assets under management amount                       $ 83,000,000
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       $ 800,000                
Remaining economic useful life       6 years 6 months