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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Beginning Balance $ 1,439 $ 1,871 $ 1,653 $ 2,021
Additions 3   8 2
Accretion (108) (107) (323) (321)
Reclassification from nonaccretable difference       62
Disposals   (5) (4) (5)
Ending Balance 1,334 $ 1,759 1,334 $ 1,759
Ossian Financial Services, Inc. [Member]        
Business Acquisition [Line Items]        
Beginning Balance 733      
Additions     762  
Accretion (44)   (73)  
Ending Balance $ 689   $ 689