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SECURITIES - Securities Available for Sale (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost $ 761,997,000   $ 761,997,000   $ 542,362,000
Unrealized Gains 7,932,000   7,932,000   12,654,000
Unrealized Losses 8,398,000   8,398,000   405,000
Estimated Fair Value 761,531,000   761,531,000   554,611,000
Amortized Cost          
Within one year 686,000   686,000    
After one, but within five years 75,962,000   75,962,000    
After five, but within ten years 20,712,000   20,712,000    
After ten years 470,000   470,000    
Total 97,830,000   97,830,000    
Amortized Cost 761,997,000   761,997,000   542,362,000
Fair Value          
Within one year 689,000   689,000    
After one, but within five years 77,278,000   77,278,000    
After five, but within ten years 21,285,000   21,285,000    
After ten years 498,000   498,000    
Total 99,750,000   99,750,000    
Fair value 761,531,000   761,531,000   554,611,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds form sale of securities resulting in gain (loss) 0 $ 0 0 $ 0  
U.S. Treasury notes and bonds          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 40,499,000   40,499,000    
Unrealized Gains 0   0    
Unrealized Losses 162,000   162,000    
Estimated Fair Value 40,337,000   40,337,000    
Amortized Cost          
Amortized Cost 40,499,000   40,499,000    
Fair Value          
Fair value 40,337,000   40,337,000    
Mortgage-backed securities, residential          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 588,555,000   588,555,000   458,245,000
Unrealized Gains 5,397,000   5,397,000   9,822,000
Unrealized Losses 7,826,000   7,826,000   201,000
Estimated Fair Value 586,126,000   586,126,000   467,866,000
Amortized Cost          
Without single maturity date 588,555,000   588,555,000    
Amortized Cost 588,555,000   588,555,000   458,245,000
Fair Value          
Without single maturity date 586,126,000   586,126,000    
Fair value 586,126,000   586,126,000   467,866,000
Obligations of states and political subdivisions          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 40,331,000   40,331,000   40,662,000
Unrealized Gains 2,021,000   2,021,000   2,743,000
Unrealized Losses 0   0   0
Estimated Fair Value 42,352,000   42,352,000   43,405,000
Amortized Cost          
Amortized Cost 40,331,000   40,331,000   40,662,000
Fair Value          
Fair value 42,352,000   42,352,000   43,405,000
Corporate bonds and notes          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 17,000,000   17,000,000   9,000,000
Unrealized Gains 116,000   116,000   47,000
Unrealized Losses 55,000   55,000   12,000
Estimated Fair Value 17,061,000   17,061,000   9,035,000
Amortized Cost          
Amortized Cost 17,000,000   17,000,000   9,000,000
Fair Value          
Fair value 17,061,000   17,061,000   9,035,000
SBA loan pools          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 75,612,000   75,612,000   34,455,000
Unrealized Gains 398,000   398,000   42,000
Unrealized Losses 355,000   355,000   192,000
Estimated Fair Value 75,655,000   75,655,000   34,305,000
Amortized Cost          
Without single maturity date 75,612,000   75,612,000    
Amortized Cost 75,612,000   75,612,000   34,455,000
Fair Value          
Without single maturity date 75,655,000   75,655,000    
Fair value $ 75,655,000   $ 75,655,000   $ 34,305,000