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Securities - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [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), before tax, portion attributable to parent   $ (11,509,000) $ 12,387,000 $ 13,871,000
Sale proceeds   4,402,000 130,912,000 0
Gross gains   9,000 1,300,000  
Gross losses   0 248,000  
Securities, carrying value   1,040,000,000.00 578,000,000  
Equity securities, at fair value   17,368,000 14,694,000  
Proceeds from sales of equity securities   0 4,148,000 1,287,000
(Loss) gain on equity securities   $ (285,000) $ (552,000) $ 496,000
Redemption of funds   60 days    
Unfunded commitments   $ 0    
Fair value of securities   10,500,000    
Amortization of gain on debt securities reclassified to held to maturity from available for sale        
Debt Securities, Available-for-sale [Line Items]        
Other comprehensive income (loss), before tax, portion attributable to parent   (383,000)    
Community Reinvestment Funds        
Debt Securities, Available-for-sale [Line Items]        
Equity securities, at fair value   6,800,000    
Other Financial Institutions        
Debt Securities, Available-for-sale [Line Items]        
Unfunded commitments   $ 0