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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Held-to-Maturity Securities [Line Items]    
Less Than 12 Months, Fair Value $ 63,078 $ 596,780
Less Than 12 Months, Unrecognized Losses (3,725) (68,103)
12 Month or Longer, Fair Value 518,144 0
12 Month or Longer, Unrecognized Losses (64,999) 0
Total Fair Value 581,222 596,780
Total Unrecognized Losses (68,724) (68,103)
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 45,799 240,949
Less Than 12 Months, Unrecognized Losses (1,405) (21,134)
12 Month or Longer, Fair Value 611,980 425,202
12 Month or Longer, Unrecognized Losses (121,130) (108,448)
Total Fair Value 657,779 666,151
Total Unrecognized Losses 122,535 129,582
States and political subdivisions    
Schedule of Held-to-Maturity Securities [Line Items]    
Less Than 12 Months, Fair Value 0 37,113
Less Than 12 Months, Unrecognized Losses 0 (4,727)
12 Month or Longer, Fair Value 36,636 0
12 Month or Longer, Unrecognized Losses (5,262) 0
Total Fair Value 36,636 37,113
Total Unrecognized Losses (5,262) (4,727)
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 15,254 52,244
Less Than 12 Months, Unrecognized Losses (187) (4,807)
12 Month or Longer, Fair Value 116,009 78,389
12 Month or Longer, Unrecognized Losses (31,959) (31,874)
Total Fair Value 131,263 130,633
Total Unrecognized Losses 32,146 36,681
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 30,720 30,211
12 Month or Longer, Unrecognized Losses (5,248) (5,995)
Total Fair Value 30,720 30,211
Total Unrecognized Losses 5,248 5,995
U.S. Treasury obligations and direct obligations of U.S. Government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 3,911 9,651
Less Than 12 Months, Unrecognized Losses (83) (245)
12 Month or Longer, Fair Value 16,354 15,541
12 Month or Longer, Unrecognized Losses (2,212) (2,072)
Total Fair Value 20,265 25,192
Total Unrecognized Losses 2,295 2,317
Residential - U.S. Government-sponsored entities    
Schedule of Held-to-Maturity Securities [Line Items]    
Less Than 12 Months, Fair Value 63,078 559,667
Less Than 12 Months, Unrecognized Losses (3,725) (63,376)
12 Month or Longer, Fair Value 481,508 0
12 Month or Longer, Unrecognized Losses (59,737) 0
Total Fair Value 544,586 559,667
Total Unrecognized Losses (63,462) (63,376)
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 9,227 149,624
Less Than 12 Months, Unrecognized Losses (440) (13,990)
12 Month or Longer, Fair Value 396,900 274,179
12 Month or Longer, Unrecognized Losses (72,598) (61,196)
Total Fair Value 406,127 423,803
Total Unrecognized Losses 73,038 75,186
Residential - Non-government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 2,747 2,890
Less Than 12 Months, Unrecognized Losses (336) (334)
12 Month or Longer, Fair Value 5,608 5,772
12 Month or Longer, Unrecognized Losses (821) (833)
Total Fair Value 8,355 8,662
Total Unrecognized Losses 1,157 1,167
Commercial - U.S. Government-sponsored entities    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 0 25,034
Less Than 12 Months, Unrecognized Losses 0 (1,724)
12 Month or Longer, Fair Value 44,985 21,110
12 Month or Longer, Unrecognized Losses (8,157) (6,478)
Total Fair Value 44,985 46,144
Total Unrecognized Losses 8,157 8,202
Commercial - Non-government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 months, Fair Value 14,660 1,506
Less Than 12 Months, Unrecognized Losses (359) (34)
12 Month or Longer, Fair Value 1,404 0
12 Month or Longer, Unrecognized Losses (135) 0
Total Fair Value 16,064 1,506
Total Unrecognized Losses $ 494 $ 34