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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost $ 669,092 $ 729,198
Gross Unrealized Gains 81 157
Gross Unrealized Losses 85,180 96,766
Allowance for Credit Losses 0  
Estimated Fair Value 583,993 632,589
Amortized Cost    
Within one year 5,678  
After one, but within five years 101,391  
After five, but within ten years 17,526  
After ten years 470  
Total 669,092 729,198
Fair Value    
Within one year 5,594  
After one, but within five years 94,363  
After five, but within ten years 14,302  
After ten years 428  
Total 583,993 632,589
U.S. treasury notes and bonds    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 59,812 61,800
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4,480 6,225
Allowance for Credit Losses 0  
Estimated Fair Value 55,332 55,574
Amortized Cost    
Total 59,812 61,800
Fair Value    
Total 55,332 55,574
Mortgage-backed securities, residential    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 476,240 518,838
Gross Unrealized Gains 6 0
Gross Unrealized Losses 72,422 83,707
Allowance for Credit Losses 0  
Estimated Fair Value 403,824 435,131
Amortized Cost    
Without single maturity date 476,240  
Total 476,240 518,838
Fair Value    
Without single maturity date 403,824  
Total 403,824 435,131
Collateralized mortgage obligations    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Allowance for Credit Losses 0  
Estimated Fair Value 0 0
Amortized Cost    
Total 0 0
Fair Value    
Total 0 0
Obligations of states and political subdivisions    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 39,503 39,828
Gross Unrealized Gains 0 2
Gross Unrealized Losses 817 938
Allowance for Credit Losses 0  
Estimated Fair Value 38,686 38,892
Amortized Cost    
Total 39,503 39,828
Fair Value    
Total 38,686 38,892
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 5,081 3,780
Allowance for Credit Losses 0  
Estimated Fair Value 20,669 21,970
Amortized Cost    
Total 25,750 25,750
Fair Value    
Total 20,669 21,970
SBA loan pools    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 67,787 82,982
Gross Unrealized Gains 75 155
Gross Unrealized Losses 2,380 2,116
Allowance for Credit Losses 0  
Estimated Fair Value 65,482 81,022
Amortized Cost    
Without single maturity date 67,787  
Total 67,787 82,982
Fair Value    
Without single maturity date 65,482  
Total $ 65,482 $ 81,022