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SECURITIES - Securities Available for Sale (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost $ 384,547,000   $ 384,547,000   $ 282,256,000
Unrealized Gains 12,062,000   12,062,000   3,146,000
Unrealized Losses 309,000   309,000   1,312,000
Estimated Fair Value 396,300,000   396,300,000   284,090,000
Amortized Cost [Abstract]          
Within one year 0   0    
After one, but within five years 27,232,000   27,232,000    
After five, but within ten years 19,703,000   19,703,000    
After ten years 759,000   759,000    
Total 47,694,000   47,694,000    
Amortized Cost 384,547,000   384,547,000   282,256,000
Fair Value [Abstract]          
Within one year 0   0    
After one, but within five years 28,769,000   28,769,000    
After five, but within ten years 20,755,000   20,755,000    
After ten years 800,000   800,000    
Total 50,324,000   50,324,000    
Estimated Fair Value 396,300,000   396,300,000   284,090,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds form sale of securities resulting in gain (loss) 0 $ 0 0 $ 15,200,000  
Debt Securities, Available-for-sale, Realized Gain     0 79,000  
Debt Securities, Available-for-sale, Realized Loss     0 (60,000)  
Tax Expense from the Sale of Available-for-Sale Securities     0 $ 5,000  
Mortgage-backed securities, residential          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 317,087,000   317,087,000   225,029,000
Unrealized Gains 9,385,000   9,385,000   1,471,000
Unrealized Losses 204,000   204,000   1,266,000
Estimated Fair Value 326,268,000   326,268,000   225,234,000
Amortized Cost [Abstract]          
Without single maturity date 317,087,000   317,087,000    
Amortized Cost 317,087,000   317,087,000   225,029,000
Fair Value [Abstract]          
Without single maturity date 326,268,000   326,268,000    
Estimated Fair Value 326,268,000   326,268,000   225,234,000
Obligations of states and political subdivisions          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 40,694,000   40,694,000   41,265,000
Unrealized Gains 2,566,000   2,566,000   1,580,000
Unrealized Losses 0   0   0
Estimated Fair Value 43,260,000   43,260,000   42,845,000
Amortized Cost [Abstract]          
Amortized Cost 40,694,000   40,694,000   41,265,000
Fair Value [Abstract]          
Estimated Fair Value 43,260,000   43,260,000   42,845,000
Corporate bonds and notes          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 7,000,000   7,000,000   250,000
Unrealized Gains 64,000   64,000   0
Unrealized Losses 0   0   0
Estimated Fair Value 7,064,000   7,064,000   250,000
Amortized Cost [Abstract]          
Amortized Cost 7,000,000   7,000,000   250,000
Fair Value [Abstract]          
Estimated Fair Value 7,064,000   7,064,000   250,000
SBA loan pools          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 19,766,000   19,766,000   15,712,000
Unrealized Gains 47,000   47,000   95,000
Unrealized Losses 105,000   105,000   46,000
Estimated Fair Value 19,708,000   19,708,000   15,761,000
Amortized Cost [Abstract]          
Without single maturity date 19,766,000   19,766,000    
Amortized Cost 19,766,000   19,766,000   15,712,000
Fair Value [Abstract]          
Without single maturity date 19,708,000   19,708,000    
Estimated Fair Value $ 19,708,000   $ 19,708,000   $ 15,761,000