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SECURITIES - Securities Available for Sale (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost $ 791,841,000   $ 795,409,000
Unrealized Gains 774,000   6,587,000
Unrealized Losses 46,272,000   9,970,000
Estimated Fair Value 746,343,000   792,026,000
Amortized Cost      
Within one year 1,303,000    
After one, but within five years 100,517,000    
After five, but within ten years 24,624,000    
After ten years 470,000    
Total 126,914,000    
Amortized Cost 791,841,000   795,409,000
Fair Value      
Within one year 1,300,000    
After one, but within five years 96,884,000    
After five, but within ten years 24,304,000    
After ten years 470,000    
Total 122,958,000    
Total 746,343,000   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 60,898,000   61,084,000
Unrealized Gains 0   27,000
Unrealized Losses 3,675,000   680,000
Estimated Fair Value 57,223,000   60,431,000
Amortized Cost      
Amortized Cost 60,898,000   61,084,000
Fair Value      
Total 57,223,000   60,431,000
Mortgage-backed securities, residential      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 570,028,000   582,060,000
Unrealized Gains 193,000   4,032,000
Unrealized Losses 41,085,000   8,731,000
Estimated Fair Value 529,136,000   577,361,000
Amortized Cost      
Without single maturity date 570,028,000    
Amortized Cost 570,028,000   582,060,000
Fair Value      
Without single maturity date 529,136,000    
Total 529,136,000   577,361,000
Obligations of states and political subdivisions      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 40,266,000   40,299,000
Unrealized Gains 246,000   2,004,000
Unrealized Losses 91,000   0
Estimated Fair Value 40,421,000   42,303,000
Amortized Cost      
Amortized Cost 40,266,000   40,299,000
Fair Value      
Total 40,421,000   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 56,000   180,000
Unrealized Losses 492,000   82,000
Estimated Fair Value 25,314,000   22,848,000
Amortized Cost      
Amortized Cost 25,750,000   22,750,000
Fair Value      
Total 25,314,000   22,848,000
SBA loan pools      
Amortized cost and estimated fair value of securities available for sale      
Amortized Cost 94,899,000   89,216,000
Unrealized Gains 279,000   344,000
Unrealized Losses 929,000   477,000
Estimated Fair Value 94,249,000   89,083,000
Amortized Cost      
Without single maturity date 94,899,000    
Amortized Cost 94,899,000   89,216,000
Fair Value      
Without single maturity date 94,249,000    
Total $ 94,249,000   $ 89,083,000