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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Investment Holdings [Line Items]            
Proceeds from sale of debt securities, available-for-sale $ 0   $ 0 $ 0 $ 94,696,000  
Debt securities, available-for-sale, realized gain   $ 9,000     569,000  
Debt securities, available-for-sale, realized loss         227,000  
Debt securities, available-for-sale, transfer to held to maturity, fair value 494,200,000          
OCI, debt securities, held-to-maturity, transfer from available-for-sale, gain (loss), before adjustment, before tax 3,800,000          
Amortization of gain on debt securities reclassified to held to maturity 116,000   0 116,000 0  
Securities, carrying value 675,500,000     675,500,000   $ 578,000,000
Equity securities, at fair value 16,422,000     16,422,000   $ 14,694,000
Proceeds from sales of equity securities 0   3,000,000 0 3,000,000  
Loss on equity securities 58,000   170,000 $ 191,000 625,000  
Redemption of funds, notice period       60 days    
Unfunded commitments 0     $ 0    
Investment in government guaranteed loans, mortgage-backed securities, small business loans 12,900,000     12,900,000    
Other comprehensive income (loss) (1,656,000)   598,000 7,117,000 (11,656,000)  
Amortization of Gain on Debt Securities Reclassified to Held to Maturity            
Investment Holdings [Line Items]            
Other comprehensive income (loss) 158,000   $ 0 158,000 $ 0  
Community reinvestment funds            
Investment Holdings [Line Items]            
Equity securities, at fair value 3,500,000     3,500,000    
Other financial institutions            
Investment Holdings [Line Items]            
Unfunded commitments $ 0     $ 0