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Investment Securities (Details Narrative) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale $ 468,951    
Federal Home Loan Bank Stock 698,300   $ 1,100
Corporate Fixed To Float Bonds [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 6,700   3,300
Mutual Funds [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 10,200   8,000
Available-for-sale Securities, Gross Realized Gains 2,200 $ 2,100  
Debt Security, Corporate, Non-US [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 10,000   10,000
Corporate Bond Securities [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 1,000   1,000
Venture Capital Funds [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 20,000    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Marketable Securities [Line Items]      
Security Owned and Pledged as Collateral, Amortized Cost 353,100   257,300
Security Owned and Pledged as Collateral, Fair Value 357,500   265,400
Mortgage-backed Securities, Issued by Private Enterprises [Member]      
Marketable Securities [Line Items]      
Security Owned and Pledged as Collateral, Amortized Cost 51,200   57,400
Security Owned and Pledged as Collateral, Fair Value $ 49,100   $ 54,700