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SECURITIES - Securities Available for Sale (Details) - USD ($)
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost $ 743,166,000   $ 795,409,000
Unrealized Gains 204,000   6,587,000
Unrealized Losses 103,018,000   9,970,000
Estimated Fair Value 640,352,000   792,026,000
Amortized Cost      
Within one year 2,937,000    
After one, but within five years 103,872,000    
After five, but within ten years 20,178,000    
After ten years 470,000    
Total 127,457,000    
Amortized Cost 743,166,000   795,409,000
Fair Value      
Within one year 2,862,000    
After one, but within five years 93,767,000    
After five, but within ten years 19,142,000    
After ten years 396,000    
Total 116,167,000    
Total 640,352,000   792,026,000
Proceeds from sales and calls of securities resulting in gains or losses      
Proceeds 0 $ 0  
U.S. Treasury notes and bonds      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 61,791,000   61,084,000
Unrealized Gains 0   27,000
Unrealized Losses 6,741,000   680,000
Estimated Fair Value 55,050,000   60,431,000
Amortized Cost      
Amortized Cost 61,791,000   61,084,000
Fair Value      
Total 55,050,000   60,431,000
Mortgage-backed securities, residential      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 530,372,000   582,060,000
Unrealized Gains 0   4,032,000
Unrealized Losses 89,738,000   8,731,000
Estimated Fair Value 440,634,000   577,361,000
Amortized Cost      
Without single maturity date 530,372,000    
Amortized Cost 530,372,000   582,060,000
Fair Value      
Without single maturity date 440,634,000    
Total 440,634,000   577,361,000
Obligations of states and political subdivisions      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 39,916,000   40,299,000
Unrealized Gains 0   2,004,000
Unrealized Losses 3,036,000   0
Estimated Fair Value 36,880,000   42,303,000
Amortized Cost      
Amortized Cost 39,916,000   40,299,000
Fair Value      
Total 36,880,000   42,303,000
Corporate bonds and notes      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 25,750,000   22,750,000
Unrealized Gains 0   180,000
Unrealized Losses 1,513,000   82,000
Estimated Fair Value 24,237,000   22,848,000
Amortized Cost      
Amortized Cost 25,750,000   22,750,000
Fair Value      
Total 24,237,000   22,848,000
SBA loan pools      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 85,337,000   89,216,000
Unrealized Gains 204,000   344,000
Unrealized Losses 1,990,000   477,000
Estimated Fair Value 83,551,000   89,083,000
Amortized Cost      
Without single maturity date 85,337,000    
Amortized Cost 85,337,000   89,216,000
Fair Value      
Without single maturity date 83,551,000    
Total $ 83,551,000   $ 89,083,000