Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangibles - Additional Information (Detail)

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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)
12 Months Ended
Oct. 27, 2016
Aug. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment     $ 0    
Intangible asset impairment charges     0 $ 0 $ 0
Core deposit intangible          
Finite-Lived Intangible Assets [Line Items]          
Total amortization expense for other intangible assets, including discontinued operations     $ 309,000 $ 362,000 $ 345,000
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