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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Held-to-Maturity:    
Less Than 12 Months, Fair Value $ 596,780  
Less Than 12 Months, Unrecognized Losses (68,103)  
12 Month or Longer, Fair Value 0  
12 Month or Longer, Unrecognized Losses 0  
Total Fair Value 596,780  
Total Unrecognized Losses (68,103)  
Available-for-Sale:    
Less than 12 months, Fair Value 240,949 $ 1,036,979
Less Than 12 Months, Unrecognized Losses (21,134) (17,990)
12 Month or Longer, Fair Value 425,202 175,681
12 Month or Longer, Unrecognized Losses (108,448) (6,743)
Total Fair Value 666,151 1,212,660
Total Unrecognized Losses 129,582 24,733
States and political subdivisions    
Held-to-Maturity:    
Less Than 12 Months, Fair Value 37,113  
Less Than 12 Months, Unrecognized Losses (4,727)  
12 Month or Longer, Fair Value 0  
12 Month or Longer, Unrecognized Losses 0  
Total Fair Value 37,113  
Total Unrecognized Losses (4,727)  
Available-for-Sale:    
Less than 12 months, Fair Value 52,244 79,360
Less Than 12 Months, Unrecognized Losses (4,807) (1,252)
12 Month or Longer, Fair Value 78,389 10,864
12 Month or Longer, Unrecognized Losses (31,874) (597)
Total Fair Value 130,633 90,224
Total Unrecognized Losses 36,681 1,849
Corporate securities    
Available-for-Sale:    
Less than 12 months, Fair Value 0 8,633
Less Than 12 Months, Unrecognized Losses 0 (235)
12 Month or Longer, Fair Value 30,211 21,960
12 Month or Longer, Unrecognized Losses (5,995) (830)
Total Fair Value 30,211 30,593
Total Unrecognized Losses 5,995 1,065
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available-for-Sale:    
Less than 12 months, Fair Value 9,651 16,103
Less Than 12 Months, Unrecognized Losses (245) (415)
12 Month or Longer, Fair Value 15,541 10,891
12 Month or Longer, Unrecognized Losses (2,072) (153)
Total Fair Value 25,192 26,994
Total Unrecognized Losses 2,317 568
Residential - U.S. Government-sponsored entities ("GSEs")    
Held-to-Maturity:    
Less Than 12 Months, Fair Value 559,667  
Less Than 12 Months, Unrecognized Losses (63,376)  
12 Month or Longer, Fair Value 0  
12 Month or Longer, Unrecognized Losses 0  
Total Fair Value 559,667  
Total Unrecognized Losses (63,376)  
Available-for-Sale:    
Less than 12 months, Fair Value 149,624 926,570
Less Than 12 Months, Unrecognized Losses (13,990) (15,883)
12 Month or Longer, Fair Value 274,179 114,747
12 Month or Longer, Unrecognized Losses (61,196) (4,110)
Total Fair Value 423,803 1,041,317
Total Unrecognized Losses 75,186 19,993
Residential - Non-GSEs    
Available-for-Sale:    
Less than 12 months, Fair Value 2,890 0
Less Than 12 Months, Unrecognized Losses (334) 0
12 Month or Longer, Fair Value 5,772 938
12 Month or Longer, Unrecognized Losses (833) (64)
Total Fair Value 8,662 938
Total Unrecognized Losses 1,167 64
Commercial - Non-GSEs    
Available-for-Sale:    
Less than 12 months, Fair Value 25,034 6,313
Less Than 12 Months, Unrecognized Losses (1,724) (205)
12 Month or Longer, Fair Value 21,110 16,281
12 Month or Longer, Unrecognized Losses (6,478) (989)
Total Fair Value 46,144 22,594
Total Unrecognized Losses 8,202 $ 1,194
Commercial - Non-GSEs    
Available-for-Sale:    
Less than 12 months, Fair Value 1,506  
Less Than 12 Months, Unrecognized Losses (34)  
12 Month or Longer, Fair Value 0  
12 Month or Longer, Unrecognized Losses 0  
Total Fair Value 1,506  
Total Unrecognized Losses $ 34