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Fair Value Disclosures - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
loan
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Valuation adjustments for loans held for sale $ 0 $ 0  
Carrying value of impaired loans held for investment 38,126,000 26,581,000  
Valuation allowance of impaired loans held for investment 2,108,000 1,415,000  
Impaired loans with no related reserve, recorded investment 23,486,000 13,174,000  
Servicing rights carrying amount before valuation allowance 6,600,000 6,800,000  
Servicing rights valuation allowance 0 0  
Goodwill impairment $ 0 0 $ 0
Other real estate, number of properties transferred 1    
Transfer of loans to other real estate owned $ 71,000 477,000 $ 729,000
Number of properties sold | property 2    
Proceeds from sale of real estate $ 670,000    
Net loss on sales of other real estate owned 28,000    
Other real estate owned 516,000 1,200,000  
Held for Investment [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of impaired loans held for investment 38,100,000 26,600,000  
Valuation allowance of impaired loans held for investment 2,100,000 1,400,000  
Lease Financings [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Valuation allowance of impaired loans held for investment 0 0  
Impaired loans with no related reserve, recorded investment $ 277,000 $ 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 $ 14,000    
Commercial Loan [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of loans | loan 1