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Investment Securities (Details Narrative) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | $ 513,500,000 |  |
Federal Home Loan Bank Stock | 698,400 |  | $ 1,100,000
Corporate Fixed To Float Bonds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | 7,100,000 |  | 3,300,000
Mutual Funds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | 10,400 |  | 8,000.0
Available-for-sale Securities, Gross Realized Gains | 2,400 | $ 2,100 |
Debt Security, Corporate, Non-US [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | 10,000.0 |  | 10,000.0
Corporate Bond Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | 1,000,000.0 |  | 1,000,000.0
Venture Capital Funds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale | 61,700 |  |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
[custom:SecurityOwnedAndPledgedAsCollateralAmortizedCost-0] | 396,900,000 |  | 257,300,000
Security Owned and Pledged as Collateral, Fair Value | 398,600,000 |  | 265,400,000
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
[custom:SecurityOwnedAndPledgedAsCollateralAmortizedCost-0] | 49,100 |  | 57,400
Security Owned and Pledged as Collateral, Fair Value | $ 47,100 |  | $ 54,700

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