| **INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands** | Jun. 30, 2023 | Dec. 31, 2022 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Amortized Cost**                                                                                                                                                                    |          |          |
| Due in one year or less                                                                                                                                                               | $ 3,066       | $ 2,822       |
| Due after one through five years                                                                                                                                                      | 26,885        | 11,694        |
| Due after five through ten years                                                                                                                                                      | 102,618       | 169,729       |
| Due after ten years                                                                                                                                                                   | 1,231,996     | 1,480,472     |
| Total debt securities with a single maturity date                                                                                                                                     | 1,364,565     | 1,664,717     |
| Total investment securities                                                                                                                                                           | 1,921,167     | 2,273,347     |
| **Fair Value**                                                                                                                                                                        |          |          |
| Due in one year or less                                                                                                                                                               | 3,028         | 2,809         |
| Due after one through five years                                                                                                                                                      | 24,963        | 11,265        |
| Due after five through ten years                                                                                                                                                      | 95,285        | 161,211       |
| Due after ten years                                                                                                                                                                   | 1,068,299     | 1,293,103     |
| Total debt securities with a single maturity date                                                                                                                                     | 1,191,575     | 1,468,388     |
| Total investment securities                                                                                                                                                           | 1,651,362     | 1,976,661     |
| **Amortized Cost**                                                                                                                                                                    |          |          |
| Due in one year or less                                                                                                                                                               | 11,816        | 13,697        |
| Due after one through five years                                                                                                                                                      | 113,862       | 80,697        |
| Due after five through ten years                                                                                                                                                      | 130,552       | 147,078       |
| Due after ten years                                                                                                                                                                   | 1,238,540     | 1,269,826     |
| Total debt securities with a single maturity date                                                                                                                                     | 1,494,770     | 1,511,298     |
| Total investment securities                                                                                                                                                           | 2,240,374     | 2,287,372     |
| **Fair Value**                                                                                                                                                                        |          |          |
| Due in one year or less                                                                                                                                                               | 11,804        | 13,749        |
| Due after one through five years                                                                                                                                                      | 105,028       | 76,453        |
| Due after five through ten years                                                                                                                                                      | 120,674       | 135,027       |
| Due after ten years                                                                                                                                                                   | 1,007,764     | 1,020,477     |
| Total debt securities with a single maturity date                                                                                                                                     | 1,245,270     | 1,245,706     |
| Total investment securities                                                                                                                                                           | 1,880,683     | 1,907,865     |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                  |          |          |
| **Amortized Cost**                                                                                                                                                                    |          |          |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                  | 556,602       | 608,630       |
| **Fair Value**                                                                                                                                                                        |          |          |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                  | 459,787       | 508,273       |
| Total investment securities                                                                                                                                                           | 459,787       | 508,273       |
| **Amortized Cost**                                                                                                                                                                    |          |          |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                  | 745,604       | 776,074       |
| Total investment securities                                                                                                                                                           | 745,604       | 776,074       |
| **Fair Value**                                                                                                                                                                        |          |          |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                  | 635,413       | 662,159       |
| Total investment securities                                                                                                                                                           | $ 635,413     | $ 662,159     |

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Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date.
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date.
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.
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| - Definition
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.
+ References
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| - Definition
Fair value of investment in debt security measured at amortized cost (held-to-maturity).
+ References
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| - Definition
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.
+ References
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| - Definition
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.
+ References
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| - Definition
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.
+ References
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| - Definition
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.
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