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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of AFS investment securities in an unrealized loss position | security 212 208
Number of HTM investment securities in an unrealized loss position | security 82 82
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value $ 30,478 $ 19,557
Less Than 12 Months, Unrecognized Losses (349) (219)
12 Month or Longer, Fair Value 569,919 588,097
12 Month or Longer, Unrecognized Losses (90,062) (108,028)
Total Fair Value 600,397 607,654
Total Unrecognized Losses 90,411 108,247
Schedule of Held-to-Maturity Securities [Line Items]    
Less Than 12 Months, Fair Value 0 8,853
Less Than 12 Months, Unrecognized Losses 0 (33)
12 Month or Longer, Fair Value 539,135 547,631
12 Month or Longer, Unrecognized Losses (59,190) (67,188)
Total Fair Value 539,135 556,484
Total Unrecognized Losses (59,190) (67,221)
States and political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 4,600 534
Less Than 12 Months, Unrecognized Losses (33) (1)
12 Month or Longer, Fair Value 111,552 114,601
12 Month or Longer, Unrecognized Losses (24,637) (29,809)
Total Fair Value 116,152 115,135
Total Unrecognized Losses 24,670 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 34,730 35,253
12 Month or Longer, Unrecognized Losses (7,283) (6,706)
Total Fair Value 34,730 35,253
Total Unrecognized Losses (7,283) (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 32,554 31,414
12 Month or Longer, Unrecognized Losses (2,819) (4,317)
Total Fair Value 32,554 31,414
Total Unrecognized Losses 2,819 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 1,308 2,893
Less Than 12 Months, Unrecognized Losses (26) (87)
12 Month or Longer, Fair Value 14,498 16,286
12 Month or Longer, Unrecognized Losses (1,699) (1,854)
Total Fair Value 15,806 19,179
Total Unrecognized Losses 1,725 1,941
Residential - U.S. government-sponsored entities and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 23,295 0
Less Than 12 Months, Unrecognized Losses (183) 0
12 Month or Longer, Fair Value 329,454 367,887
12 Month or Longer, Unrecognized Losses (47,871) (63,607)
Total Fair Value 352,749 367,887
Total Unrecognized Losses 48,054 63,607
Schedule of Held-to-Maturity Securities [Line Items]    
Less Than 12 Months, Fair Value 0 8,853
Less Than 12 Months, Unrecognized Losses 0 (33)
12 Month or Longer, Fair Value 504,405 512,378
12 Month or Longer, Unrecognized Losses (51,907) (60,482)
Total Fair Value 504,405 521,231
Total Unrecognized Losses (51,907) (60,515)
Residential - Non-government agencies    
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 7,992 8,169
12 Month or Longer, Unrecognized Losses (722) (980)
Total Fair Value 7,992 8,169
Total Unrecognized Losses 722 980
Commercial - U.S. government-sponsored entities and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 1,275 6,467
Less Than 12 Months, Unrecognized Losses (107) (1)
12 Month or Longer, Fair Value 68,444 44,447
12 Month or Longer, Unrecognized Losses (12,307) (7,403)
Total Fair Value 69,719 50,914
Total Unrecognized Losses 12,414 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 5,425 5,293
12 Month or Longer, Unrecognized Losses (7) (58)
Total Fair Value 5,425 14,956
Total Unrecognized Losses $ 7 $ 188