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SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities available-for-sale, Fair Value [Abstract]    
Total $ 0  
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 290,385 $ 422,634
12 Consecutive Months or Longer 70,248 4,748
Total 360,633 427,382
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 18,572 6,333
12 Consecutive Months or Longer 7,483 233
Total 26,055 6,566
Treasury Securities    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 234,530 244,769
12 Consecutive Months or Longer 0  
Total 234,530 244,769
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 13,134 3,147
12 Consecutive Months or Longer 0  
Total 13,134 3,147
State and municipal obligations    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 31,150 18,887
12 Consecutive Months or Longer 4,190  
Total 35,340 18,887
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 1,308 302
12 Consecutive Months or Longer 532  
Total 1,840 302
Agency Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months   58,607
12 Consecutive Months or Longer   21,647
Total   80,254
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months   1,369
12 Consecutive Months or Longer   853
Total   2,222
Corporate Notes    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 95,535 37,620
12 Consecutive Months or Longer 2,910  
Total 98,445 37,620
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 4,847 754
12 Consecutive Months or Longer 90  
Total 4,937 754
Agency collateralized mortgage obligations ("CMOs")    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 320,114 349,879
12 Consecutive Months or Longer 116,425 3,182
Total 436,539 353,061
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 16,773 8,672
12 Consecutive Months or Longer 12,859 123
Total $ 29,632 $ 8,795