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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Investment Holdings [Line Items]        
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      
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 31,100,000   $ 13,088,000  
Proceeds from sale of debt securities, available-for-sale 0   0  
Securities, carrying value 1,080,000,000.00     $ 1,040,000,000.00
Equity securities, at fair value 16,915,000     $ 17,368,000
Proceeds from sales of equity securities 0      
Loss on equity securities $ 485,000   144,000  
Redemption of funds, notice period 60 days      
Unfunded commitments $ 0      
Investment in government guaranteed loans, mortgage-backed securities, small business loans 10,100,000      
Amortization of Gain on Debt Securities Reclassified to Held to Maturity        
Investment Holdings [Line Items]        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 135,000   $ 0  
Community reinvestment funds        
Investment Holdings [Line Items]        
Equity securities, at fair value 6,800,000      
Other financial institutions        
Investment Holdings [Line Items]        
Unfunded commitments $ 0