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Business Combination and Asset Purchase - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2019
USD ($)
Office
$ / shares
shares
Dec. 13, 2013
USD ($)
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2019
Loan
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Business Acquisition [Line Items]              
Common stock, shares outstanding | shares     12,230,000   12,230,000   10,400,000
Business combination, acquisition related costs         $ 1,270,000   $ 742,100
Business combination, acquisition related costs percentage             98.40%
Recognition of core deposit intangible asset with acquired purchase         $ 3,900,000    
Remaining economic useful life         7 years    
Goodwill     $ 47,340,000   $ 47,340,000   $ 4,074,000
Fair value of assets acquired     257,200,000   257,200,000    
Gross principal and contractual interest     359,200,000   359,200,000    
Acquisition expected to be uncollectible     4,700,000   $ 4,700,000    
Loan receivable weighted average life         70 months    
Business combination, premises and equipment written down value         $ 1,200,000    
Business combination, average remaining life         16 years 9 months    
Fair value for certificate of deposit, valuation amount     500,000   $ 500,000    
Fair value for certificate of deposit, amortization period         1 year 6 months    
Fair value of Federal Home Loan Bank (FHLB) advances, valuation amount     1,300,000   $ 1,300,000    
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period         2 years 3 months 18 days    
Fair value adjustment of loans acquired and accounted $ 2,118,000   63,000   $ 63,000    
Number of commercial purchased credit impaired loans paid off | Loan       2      
Credit loss related to commercial purchased credit impaired loans         1,985,000    
Amortization expense         546,000 $ 126,000  
Amortization expense     727,000   727,000    
Core Deposits [Member] | Custar [Member]              
Business Acquisition [Line Items]              
Recognition of core deposit intangible asset with acquired purchase   $ 1,170,000          
Limberlost Bancshares, Inc. [Member]              
Business Acquisition [Line Items]              
Common stock issued in exchange of each outstanding share | shares 1,830,000            
Total consideration for acquisition $ 78,902,000       78,902,000    
Cash paid for acquisition         8,465,000    
Stock issued for acquisition         70,437,000    
Goodwill 43,266,000            
Limberlost Bancshares, Inc. [Member] | Core Deposits [Member]              
Business Acquisition [Line Items]              
Recognition of core deposit intangible asset with acquired purchase $ 3,900,000            
Remaining economic useful life 7 years            
Consulting Fees [Member]              
Business Acquisition [Line Items]              
Business combination, acquisition related costs         19,300   340,000
Other General and Administrative Expenses [Member]              
Business Acquisition [Line Items]              
Business combination, acquisition related costs         195,400   331,500
Data Processing [Member]              
Business Acquisition [Line Items]              
Business combination, acquisition related costs         867,600   $ 58,600
Employee Benefits [Member]              
Business Acquisition [Line Items]              
Business combination, acquisition related costs         156,600    
ATM Expense [Member]              
Business Acquisition [Line Items]              
Business combination, acquisition related costs         31,400    
Bank of Geneva [Member]              
Business Acquisition [Line Items]              
Number of full-service offices | Office 6            
Pro-forma operating revenue, net of tax     $ 5,500,000        
Limberlost Bancshares, Inc. [Member]              
Business Acquisition [Line Items]              
Common stock issued in exchange of each outstanding share | shares 1,830            
Cash payment for exchange of each share | $ / shares $ 8,465.00            
Common stock, shares outstanding | shares 1,000            
Share price | $ / shares $ 38.49            
Total consideration for acquisition $ 78,900,000            
Cash paid for acquisition 8,500,000       $ 8,465,000    
Stock issued for acquisition $ 70,400,000