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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost $ 624,955 $ 669,092
Gross Unrealized Gains 77 81
Gross Unrealized Losses 70,457 85,180
Allowance for Credit Losses 0 0
Estimated Fair Value 554,575 583,993
Amortized Cost    
Within one year 22,027  
After one, but within five years 83,325  
After five, but within ten years 17,779  
After ten years 150  
Total 123,281  
Total 624,955 669,092
Fair Value    
Within one year 21,732  
After one, but within five years 78,647  
After five, but within ten years 14,875  
After ten years 144  
Total 115,398  
Total 554,575 583,993
U.S. Treasury notes and bonds    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 59,863 59,812
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,839 4,480
Allowance for Credit Losses 0 0
Estimated Fair Value 57,024 55,332
Amortized Cost    
Total 59,863 59,812
Fair Value    
Total 57,024 55,332
Mortgage-backed securities, residential    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 445,965 476,240
Gross Unrealized Gains 23 6
Gross Unrealized Losses 60,595 72,422
Allowance for Credit Losses 0 0
Estimated Fair Value 385,393 403,824
Amortized Cost    
Without single maturity date 445,965  
Total 445,965 476,240
Fair Value    
Without single maturity date 385,393  
Total 385,393 403,824
Obligations of states and political subdivisions    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 37,668 39,503
Gross Unrealized Gains 0 0
Gross Unrealized Losses 759 817
Allowance for Credit Losses 0 0
Estimated Fair Value 36,909 38,686
Amortized Cost    
Total 37,668 39,503
Fair Value    
Total 36,909 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 4,285 5,081
Allowance for Credit Losses 0 0
Estimated Fair Value 21,465 20,669
Amortized Cost    
Total 25,750 25,750
Fair Value    
Total 21,465 20,669
SBA loan pools    
Amortized cost and estimated fair value of debt securities available-for-sale    
Amortized Cost 55,709 67,787
Gross Unrealized Gains 54 75
Gross Unrealized Losses 1,979 2,380
Allowance for Credit Losses 0 0
Estimated Fair Value 53,784 65,482
Amortized Cost    
Without single maturity date 55,709  
Total 55,709 67,787
Fair Value    
Without single maturity date 53,784  
Total $ 53,784 $ 65,482