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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Collateral dependent loan charge-offs $ 638 $ 2,100  
Collateral dependent impaired loans, recorded investment 73,700 57,500  
Specific valuation allowance allocations 28,500 9,100  
Reported net carrying amount of impaired loans $ 45,200 48,400  
Valuation of loan servicing rights, discount rate 8.00%    
Net impairment (recovery of impairment) on loan servicing rights $ 388 429  
Foreclosed assets measured at fair value upon initial recognition 5,700 3,500  
Allowance for loan losses, charge-offs 2,000 1,900  
Loss due to re-measurement of repossessed assets $ 390 $ 361 $ 1,000
Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Valuation of loan servicing rights, prepayment rate 0.00%    
Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Valuation of loan servicing rights, prepayment rate 24.00%    
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of available for sale securities | security 4