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Fair Value Disclosures - Additional Information (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
loan
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Servicing rights carrying amount before valuation allowance $ 6,500,000 $ 6,600,000  
Servicing rights valuation allowance 87,000 0  
Goodwill impairment 0 0 $ 0
Impairments to identifiable intangible assets $ 0 0 0
Other real estate, number of properties transferred 2    
Transfer of loans to other real estate owned $ 8,405,000 71,000 $ 477,000
Number of properties sold | property 2    
Proceeds from sale of real estate $ 325,000    
Net loss on sales of other real estate owned 106,000    
Other real estate owned 7,400,000 516,000  
Held for Investment [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of impaired loans held for investment 31,500,000 38,100,000  
Valuation allowance of impaired loans held for investment 585,000 2,100,000  
Lease Financings [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of impaired loans held for investment $ 0 277,000  
Valuation allowance of impaired loans held for investment   $ 0  
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of loans with unrealized gain | loan 1    
Unrealized gain on loans $ 8,000    
Commercial Loan [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of loans | loan 1