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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Investments, Debt and Equity Securities [Abstract] |  |
Number of AFS investment securities in an unrealized loss position | security | 220 | 208
Number of HTM investment securities in an unrealized loss position | security | 83 | 82
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | $ 48,334 | $ 19,557
Less Than 12 Months, Unrecognized Losses | (515) | (219)
12 Month or Longer, Fair Value | 580,461 | 588,097
12 Month or Longer, Unrecognized Losses | (114,551) | (108,028)
Total Fair Value | 628,795 | 607,654
Total Unrecognized Losses | 115,066 | 108,247
Schedule of Held-to-Maturity Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 16,324 | 8,853
Less Than 12 Months, Unrecognized Losses | (112) | (33)
12 Month or Longer, Fair Value | 525,361 | 547,631
12 Month or Longer, Unrecognized Losses | (83,151) | (67,188)
Total Fair Value | 541,685 | 556,484
Total Unrecognized Losses | (83,263) | (67,221)
States and political subdivisions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 5,888 | 534
Less Than 12 Months, Unrecognized Losses | (46) | (1)
12 Month or Longer, Fair Value | 111,345 | 114,601
12 Month or Longer, Unrecognized Losses | (29,332) | (29,809)
Total Fair Value | 117,233 | 115,135
Total Unrecognized Losses | 29,378 | 29,810
Schedule of Held-to-Maturity Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrecognized Losses | 0 | 0
12 Month or Longer, Fair Value | 34,660 | 35,253
12 Month or Longer, Unrecognized Losses | (7,324) | (6,706)
Total Fair Value | 34,660 | 35,253
Total Unrecognized Losses | (7,324) | (6,706)
Corporate securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 0 | 0
Less Than 12 Months, Unrecognized Losses | 0 | 0
12 Month or Longer, Fair Value | 31,398 | 31,414
12 Month or Longer, Unrecognized Losses | (4,213) | (4,317)
Total Fair Value | 31,398 | 31,414
Total Unrecognized Losses | 4,213 | 4,317
U.S. Treasury and other government-sponsored entities and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 6,813 | 2,893
Less Than 12 Months, Unrecognized Losses | (57) | (87)
12 Month or Longer, Fair Value | 16,134 | 16,286
12 Month or Longer, Unrecognized Losses | (2,033) | (1,854)
Total Fair Value | 22,947 | 19,179
Total Unrecognized Losses | 2,090 | 1,941
Residential - U.S. government-sponsored entities and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 9,802 | 0
Less Than 12 Months, Unrecognized Losses | (56) | 0
12 Month or Longer, Fair Value | 334,758 | 367,887
12 Month or Longer, Unrecognized Losses | (62,757) | (63,607)
Total Fair Value | 344,560 | 367,887
Total Unrecognized Losses | 62,813 | 63,607
Schedule of Held-to-Maturity Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 16,324 | 8,853
Less Than 12 Months, Unrecognized Losses | (112) | (33)
12 Month or Longer, Fair Value | 490,701 | 512,378
12 Month or Longer, Unrecognized Losses | (75,827) | (60,482)
Total Fair Value | 507,025 | 521,231
Total Unrecognized Losses | (75,939) | (60,515)
Residential - Non-government agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 5,709 | 0
Less Than 12 Months, Unrecognized Losses | (82) | 0
12 Month or Longer, Fair Value | 8,020 | 8,169
12 Month or Longer, Unrecognized Losses | (999) | (980)
Total Fair Value | 13,729 | 8,169
Total Unrecognized Losses | 1,081 | 980
Commercial - U.S. government-sponsored entities and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 20,122 | 6,467
Less Than 12 Months, Unrecognized Losses | (274) | (1)
12 Month or Longer, Fair Value | 63,757 | 44,447
12 Month or Longer, Unrecognized Losses | (15,060) | (7,403)
Total Fair Value | 83,879 | 50,914
Total Unrecognized Losses | 15,334 | 7,404
Commercial - Non-government agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less than 12 months, Fair Value | 0 | 9,663
Less Than 12 Months, Unrecognized Losses | 0 | (130)
12 Month or Longer, Fair Value | 15,049 | 5,293
12 Month or Longer, Unrecognized Losses | (157) | (58)
Total Fair Value | 15,049 | 14,956
Total Unrecognized Losses | $ 157 | $ 188

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