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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investment Holdings [Line Items]          
Proceeds from sale of debt securities, available-for-sale $ 0 $ 0 $ 94,696,000 $ 0  
Debt securities, available-for-sale, realized gain     569,000    
Debt securities, available-for-sale, realized loss     (227,000)    
Securities, carrying value 601,700,000   601,700,000   $ 581,100,000
Equity securities, at fair value 17,182,000   17,182,000   $ 16,473,000
Payments to acquire equity securities, FV-NI     1,164,000 161,000  
Proceeds from sales of equity securities 0 0 0 1,153,000  
(Loss) gain on equity securities 198,000 $ 100,000 (455,000) $ 453,000  
Investment in community development loans 3,500,000   $ 3,500,000    
Redemption of funds     60 days    
Unfunded commitments 0   $ 0    
Investment in government guaranteed loans, mortgage-backed securities, small business loans 12,600,000   12,600,000    
Other financial institutions          
Investment Holdings [Line Items]          
Equity securities, at fair value 1,000,000.0   1,000,000.0    
Unfunded commitments 0   0    
Community reinvestment funds          
Investment Holdings [Line Items]          
Equity securities, at fair value $ 16,100,000   $ 16,100,000