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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Goodwill [Line Items]          
Net assets acquired $ 8,931   $ 8,931   $ 2,922
Accumulated amortization of intangibles 3,338   3,338   2,382
Amortization of intangibles 506 $ 233 906 $ 376  
Mortgage servicing asset 13,100   13,100   7,100
Core Deposits [Member]          
Goodwill [Line Items]          
Net assets acquired 7,521   7,521   1,410
Accumulated amortization of intangibles 2,105   2,105   1,366
Loan Servicing Assets Included in Other Amortization Intangibles [Member]          
Goodwill [Line Items]          
Accumulated amortization of intangibles 274   274   209
Loan Servicing Assets Included in Interest and Fees on Loans [Member]          
Goodwill [Line Items]          
Amortization of intangibles     $ 115   $ 189
Bay Banks [Member] | Core Deposits [Member]          
Goodwill [Line Items]          
Amortization of intangible assets     10 years    
Net assets acquired $ 6,900   $ 6,900    
Minimum [Member]          
Goodwill [Line Items]          
Amortization of intangible assets     5 years    
Maximum [Member]          
Goodwill [Line Items]          
Amortization of intangible assets     12 years