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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, Amortized Cost |  |
Within 1 year | $ 9,800 |
Over 1 year to 5 years | 10,863 |
Over 5 years to 10 years | 52,127 |
Over 10 years | 46,044 |
Total bonds and obligations | 118,834 |
Mortgage-backed securities | 1,502,137 |
Amortized Cost | 1,620,971 | $ 1,661,196
Available for sale, Fair Value |  |
Within 1 year | 9,801 |
Over 1 year to 5 years | 10,694 |
Over 5 years to 10 years | 49,259 |
Over 10 years | 44,563 |
Total bonds and obligations | 114,317 |
Mortgage-backed securities | 1,292,954 |
Fair Value | 1,407,271 | 1,423,200
Held to maturity, Amortized Cost |  |
Within 1 year | 802 |
Over 1 year to 5 years | 2,222 |
Over 5 years to 10 years | 34,563 |
Over 10 years | 228,352 |
Total bonds and obligations | 265,939 |
Mortgage-backed securities | 308,667 |
Amortized Cost | 574,606 | 583,453
Held to maturity, Fair Value |  |
Within 1 year | 803 |
Over 1 year to 5 years | 2,218 |
Over 5 years to 10 years | 34,659 |
Over 10 years | 210,077 |
Total bonds and obligations | 247,757 |
Mortgage-backed securities | 259,334 |
Fair Value | $ 507,091 | $ 507,464

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