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Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs on Recurring Basis (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance $ 7,098    
Ending Balance   $ 7,098  
Mortgage servicing rights      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning Balance 7,098 6,687 $ 6,595
Transfers into (out of) Level 3 0 0 0
Change Included in Earnings (1,811) (146) (718)
Issuances 913 557 810
Ending Balance $ 6,200 $ 7,098 $ 6,687