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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Held-to-Maturity:    
Less Than 12 Months, Fair Value $ 305,007 $ 596,780
Less Than 12 Months, Unrecognized Losses (20,724) (68,103)
12 Month or Longer, Fair Value 274,764 0
12 Month or Longer, Unrecognized Losses (38,717) 0
Total Fair Value 579,771 596,780
Total Unrecognized Losses (59,441) (68,103)
Available-for-Sale:    
Less than 12 months, Fair Value 47,579 240,949
Less Than 12 Months, Unrecognized Losses (1,152) (21,134)
12 Month or Longer, Fair Value 625,851 425,202
12 Month or Longer, Unrecognized Losses (113,197) (108,448)
Total Fair Value 673,430 666,151
Total Unrecognized Losses 114,349 129,582
States and political subdivisions    
Held-to-Maturity:    
Less Than 12 Months, Fair Value 0 37,113
Less Than 12 Months, Unrecognized Losses 0 (4,727)
12 Month or Longer, Fair Value 37,121 0
12 Month or Longer, Unrecognized Losses (4,746) 0
Total Fair Value 37,121 37,113
Total Unrecognized Losses (4,746) (4,727)
Available-for-Sale:    
Less than 12 months, Fair Value 13,008 52,244
Less Than 12 Months, Unrecognized Losses (307) (4,807)
12 Month or Longer, Fair Value 114,337 78,389
12 Month or Longer, Unrecognized Losses (30,826) (31,874)
Total Fair Value 127,345 130,633
Total Unrecognized Losses 31,133 36,681
Corporate securities    
Available-for-Sale:    
Less than 12 months, Fair Value 0 0
Less Than 12 Months, Unrecognized Losses 0 0
12 Month or Longer, Fair Value 31,097 30,211
12 Month or Longer, Unrecognized Losses (4,990) (5,995)
Total Fair Value 31,097 30,211
Total Unrecognized Losses 4,990 5,995
U.S. Treasury obligations and direct obligations of U.S. Government agencies    
Available-for-Sale:    
Less than 12 months, Fair Value 5,749 9,651
Less Than 12 Months, Unrecognized Losses (140) (245)
12 Month or Longer, Fair Value 17,011 15,541
12 Month or Longer, Unrecognized Losses (2,055) (2,072)
Total Fair Value 22,760 25,192
Total Unrecognized Losses 2,195 2,317
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Less Than 12 Months, Fair Value 305,007 559,667
Less Than 12 Months, Unrecognized Losses (20,724) (63,376)
12 Month or Longer, Fair Value 237,643 0
12 Month or Longer, Unrecognized Losses (33,971) 0
Total Fair Value 542,650 559,667
Total Unrecognized Losses (54,695) (63,376)
Available-for-Sale:    
Less than 12 months, Fair Value 9,673 149,624
Less Than 12 Months, Unrecognized Losses (240) (13,990)
12 Month or Longer, Fair Value 411,811 274,179
12 Month or Longer, Unrecognized Losses (66,826) (61,196)
Total Fair Value 421,484 423,803
Total Unrecognized Losses 67,066 75,186
Residential - Non-government agencies    
Available-for-Sale:    
Less than 12 months, Fair Value 2,843 2,890
Less Than 12 Months, Unrecognized Losses (274) (334)
12 Month or Longer, Fair Value 5,795 5,772
12 Month or Longer, Unrecognized Losses (703) (833)
Total Fair Value 8,638 8,662
Total Unrecognized Losses 977 1,167
Commercial - U.S. Government-sponsored entities    
Available-for-Sale:    
Less than 12 months, Fair Value 0 25,034
Less Than 12 Months, Unrecognized Losses 0 (1,724)
12 Month or Longer, Fair Value 45,800 21,110
12 Month or Longer, Unrecognized Losses (7,797) (6,478)
Total Fair Value 45,800 46,144
Total Unrecognized Losses 7,797 8,202
Commercial - Non-government agencies    
Available-for-Sale:    
Less than 12 months, Fair Value 16,306 1,506
Less Than 12 Months, Unrecognized Losses (191) (34)
12 Month or Longer, Fair Value 0 0
12 Month or Longer, Unrecognized Losses 0 0
Total Fair Value 16,306 1,506
Total Unrecognized Losses $ 191 $ 34