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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost $ 641,320 $ 669,092
Gross Unrealized Gains 68 81
Gross Unrealized Losses 90,461 85,180
Allowance for Credit Losses 0 0
Estimated Fair Value 550,927 583,993
Amortized Cost    
Within one year 18,753  
After one, but within five years 87,593  
After five, but within ten years 17,162  
After ten years 150  
Total 123,658  
Total 641,320 669,092
Fair Value    
Within one year 17,863  
After one, but within five years 80,490  
After five, but within ten years 14,172  
After ten years 137  
Total 112,662  
Total 550,927 583,993
U.S. Treasury notes and bonds    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 59,845 59,812
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4,371 4,480
Allowance for Credit Losses 0 0
Estimated Fair Value 55,474 55,332
Amortized Cost    
Total 59,845 59,812
Fair Value    
Total 55,474 55,332
Mortgage-backed securities, residential    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 456,788 476,240
Gross Unrealized Gains 7 6
Gross Unrealized Losses 77,046 72,422
Allowance for Credit Losses 0 0
Estimated Fair Value 379,749 403,824
Amortized Cost    
Without single maturity date 456,788  
Total 456,788 476,240
Fair Value    
Without single maturity date 379,749  
Total 379,749 403,824
Obligations of states and political subdivisions    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 38,063 39,503
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,283 817
Allowance for Credit Losses 0 0
Estimated Fair Value 35,780 38,686
Amortized Cost    
Total 38,063 39,503
Fair Value    
Total 35,780 38,686
Corporate bonds and notes    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 25,750 25,750
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4,342 5,081
Allowance for Credit Losses 0 0
Estimated Fair Value 21,408 20,669
Amortized Cost    
Total 25,750 25,750
Fair Value    
Total 21,408 20,669
SBA loan pools    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 60,874 67,787
Gross Unrealized Gains 61 75
Gross Unrealized Losses 2,419 2,380
Allowance for Credit Losses 0 0
Estimated Fair Value 58,516 65,482
Amortized Cost    
Without single maturity date 60,874  
Total 60,874 67,787
Fair Value    
Without single maturity date 58,516  
Total $ 58,516 $ 65,482