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Investment Securities (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale $ 405,848    
Federal Home Loan Bank Stock 698,300   $ 1,100
Corporate Fixed To Float Bonds [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 3,300   3,300
Mutual Funds [Member]      
Marketable Securities [Line Items]      
Debt Securities, Available-for-sale 9,700   8,000
Available-for-sale Securities, Gross Realized Gains 1,700 $ 3,800  
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
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Marketable Securities [Line Items]      
Security Owned and Pledged as Collateral, Amortized Cost 295,000   257,300
Security Owned and Pledged as Collateral, Fair Value 298,700   265,400
Mortgage-backed Securities, Issued by Private Enterprises [Member]      
Marketable Securities [Line Items]      
Security Owned and Pledged as Collateral, Amortized Cost 53,000   57,400
Security Owned and Pledged as Collateral, Fair Value $ 50,800   $ 54,700