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Securities - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2013
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale securities transferred to held-to-maturity securities     $ 12,700,000 $ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross     209,000 $ 13,300,000
Debt securities, available-for-sale, realized gain (loss) $ (87,000) $ 0    
Available-for-sale, amortized cost 564,478,000   569,874,000  
Available-for-sale, fair value 546,470,000   568,255,000  
Estimated fair value of securities pledged for deposits and other purposes 1,090,000,000.00   1,140,000,000  
Equity investments 93,888,000   101,155,000  
Corporate debt securities        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale, amortized cost 63,100,000      
Available-for-sale, fair value 61,800,000      
Reverse Repurchase Agreement        
Debt Securities, Available-for-sale [Line Items]        
Estimated fair value of securities pledged for reverse repurchase agreements $ 114,600,000   $ 142,900,000