Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangibles - Additional Information (Detail)

v3.21.1
Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Oct. 27, 2016
Aug. 31, 2014
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Intangible assets amortization expense     $ 54,000 $ 65,000  
Impairment of goodwill and other intangible assets         $ 0
Goodwill and other intangible assets triggering event     No triggering event has occurred subsequent to December 31, 2020 that would require a reassessment of goodwill and other intangible assets.    
CBI Merger          
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 11,000,000.0        
CBI Merger | Third-party originators intangible          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired $ 483,000        
CBI Merger | Core deposit intangible          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired   $ 2,200,000