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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) and Held to Maturity (HTM) Securities, Segregated by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, Amortized Cost |  |
Within 1 year | $ 8,799 |
Over 1 year to 5 years | 10,866 |
Over 5 years to 10 years | 54,612 |
Over 10 years | 43,528 |
Total bonds and obligations | 117,805 |
Mortgage-backed securities | 1,460,739 |
Amortized Cost | 1,578,544 | $ 1,661,196
Available for sale, Fair Value |  |
Within 1 year | 8,800 |
Over 1 year to 5 years | 10,754 |
Over 5 years to 10 years | 49,747 |
Over 10 years | 41,361 |
Total bonds and obligations | 110,662 |
Mortgage-backed securities | 1,229,669 |
Fair Value | 1,340,331 | 1,423,200
Held to maturity, Amortized Cost |  |
Within 1 year | 894 |
Over 1 year to 5 years | 2,309 |
Over 5 years to 10 years | 36,477 |
Over 10 years | 222,185 |
Total bonds and obligations | 261,865 |
Mortgage-backed securities | 301,900 |
Amortized Cost | 563,765 | 583,453
Held to maturity, Fair Value |  |
Within 1 year | 894 |
Over 1 year to 5 years | 2,298 |
Over 5 years to 10 years | 36,281 |
Over 10 years | 201,301 |
Total bonds and obligations | 240,774 |
Mortgage-backed securities | 247,186 |
Fair Value | $ 487,960 | $ 507,464

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