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INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value |  | $ 37,916
Less than 12 Months, Unrealized/Unrecognized Losses |  | (81)
Total, Estimated Fair Value |  | 37,916
Total, Unrealized/Unrecognized Losses |  | $ (81)
Number of securities of one issuer | item | 0 | 0
Impairment loss | $ 0 | $ 0
Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 385,899 | 83,964
Less than 12 Months, Unrealized/Unrecognized Losses | (4,909) | (248)
12 months or more, Estimated Fair Value | 28,064 | 385
12 months or more, Unrealized/Unrecognized Losses | (312) | (1)
Total, Estimated Fair Value | 413,963 | 84,349
Total, Unrealized/Unrecognized Losses | (5,221) | (249)
Residential mortgage securities | Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 315,184 | 33,734
Less than 12 Months, Unrealized/Unrecognized Losses | (3,859) | (74)
Total, Estimated Fair Value | 315,184 | 33,734
Total, Unrealized/Unrecognized Losses | (3,859) | (74)
Commercial mortgage securities | Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 14,919 | 12,314
Less than 12 Months, Unrealized/Unrecognized Losses | (263) | (93)
12 months or more, Estimated Fair Value | 379 | 385
12 months or more, Unrealized/Unrecognized Losses |  | (1)
Total, Estimated Fair Value | 15,298 | 12,699
Total, Unrealized/Unrecognized Losses | (263) | $ (94)
Asset-backed Securities | Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 4,733 |
Less than 12 Months, Unrealized/Unrecognized Losses | (17) |
Total, Estimated Fair Value | 4,733 |
Total, Unrealized/Unrecognized Losses | (17) |
U.S. Government agency securities | Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 39,546 |
Less than 12 Months, Unrealized/Unrecognized Losses | (451) |
12 months or more, Estimated Fair Value | 27,685 |
12 months or more, Unrealized/Unrecognized Losses | (312) |
Total, Estimated Fair Value | 67,231 |
Total, Unrealized/Unrecognized Losses | (763) |
Securities issued by states and political subdivisions in the U.S | Available-for-sale Securities. |  |
Available-for-sale Securities |  |
Less than 12 Months, Estimated Fair Value | 11,517 |
Less than 12 Months, Unrealized/Unrecognized Losses | (319) |
Total, Estimated Fair Value | 11,517 |
Total, Unrealized/Unrecognized Losses | $ (319) |

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