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INVESTMENT SECURITIES (Details Narrative) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale |  | $ 359,866 |
Federal Home Loan Bank Stock |  | 1,100 | $ 991,400
Available-for-sale Securities, Gross Unrealized Gain | $ 124,300 | 14,554 | 4,153
Available-for-sale Securities, Gross Realized Gains |  | 99,100 | 355,600
Available-for-sale Securities, Gross Realized Losses |  |  | 219,600
[custom:SecurityOwnedAndPledgedAsCollateralAmortizedCost-0] |  | 155,000 | 138,600
Security Owned and Pledged as Collateral, Fair Value |  | 161,500 | 139,300
Corporate Fixed To Float Bonds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale |  | 3,300 |
Mutual Funds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Debt Securities, Available-for-sale |  | 8,000 | 8,800
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] |  |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 7,375 | 1,490
[custom:SecurityOwnedAndPledgedAsCollateralAmortizedCost-0] |  | 257,300 | 182,700
Security Owned and Pledged as Collateral, Fair Value |  | 265,400 | 183,600
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
[custom:SecurityOwnedAndPledgedAsCollateralAmortizedCost-0] |  | 57,400 | 73,500
Security Owned and Pledged as Collateral, Fair Value |  | $ 54,700 | $ 73,500

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