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Business Combination and Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]        
Beginning Balance $ 1,542 $ 1,978 $ 1,653 $ 2,021
Additions 4 1 5 2
Accretion (107) (108) (215) (214)
Reclassification from nonaccretable difference       62
Disposals     (4)  
Ending Balance 1,439 $ 1,871 1,439 $ 1,871
Ossian Financial Services, Inc. [Member]        
Business Acquisition [Line Items]        
Additions 762   762  
Accretion (29)   (29)  
Ending Balance $ 733   $ 733