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Business Combination & Asset Purchase - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2019
USD ($)
Office
$ / shares
shares
Dec. 13, 2013
USD ($)
Dec. 31, 2019
USD ($)
Loan
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Common stock, shares outstanding | shares     12,230,000 10,400,000  
Business combination, acquisition related costs     $ 1,280,000 $ 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 $ 4,074,000  
Fair value of assets acquired     257,200,000    
Gross principal and contractual interest     359,200,000    
Acquisition expected to be uncollectible     $ 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    
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    
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   $ 62,000    
Number of commercial purchased credit impaired loans paid off | Loan     2    
Discount recognized at acquisition related to commercial purchased credit-impaired loans     $ 1,985,000    
Amortization expense     727,000 167,000 $ 245,000
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     199,800 331,500  
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     163,000    
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     7,400    
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