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SECURITIES - Securities Available for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost $ 304,616   $ 304,616   $ 282,256
Unrealized Gains 12,546   12,546   3,146
Unrealized Losses 101   101   1,312
Estimated Fair Value 317,061   317,061   284,090
Amortized Cost [Abstract]          
Within one year 285   285    
After one, but within five years 23,248   23,248    
After five, but within ten years 18,720   18,720    
After ten years 759   759    
Total 43,012   43,012    
Amortized Cost 304,616   304,616   282,256
Fair Value [Abstract]          
Within one year 285   285    
After one, but within five years 24,569   24,569    
After five, but within ten years 19,900   19,900    
After ten years 801   801    
Total 45,555   45,555    
Estimated Fair Value 317,061   317,061   284,090
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds form sale of securities resulting in gain (loss) 0 $ 15,200 0 $ 15,200  
Debt Securities, Available-for-sale, Realized Gain 0 79 0 79  
Debt Securities, Available-for-sale, Realized Loss 0 (60) 0 (60)  
Tax Expense from the Sale of Available-for-Sale Securities 0 $ 5 0 $ 5  
Mortgage-backed securities, residential          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 241,357   241,357   225,029
Unrealized Gains 9,951   9,951   1,471
Unrealized Losses 1   1   1,266
Estimated Fair Value 251,307   251,307   225,234
Amortized Cost [Abstract]          
Without single maturity date 241,357   241,357    
Amortized Cost 241,357   241,357   225,029
Fair Value [Abstract]          
Without single maturity date 251,307   251,307    
Estimated Fair Value 251,307   251,307   225,234
Obligations of states and political subdivisions          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 40,762   40,762   41,265
Unrealized Gains 2,543   2,543   1,580
Unrealized Losses 0   0   0
Estimated Fair Value 43,305   43,305   42,845
Amortized Cost [Abstract]          
Amortized Cost 40,762   40,762   41,265
Fair Value [Abstract]          
Estimated Fair Value 43,305   43,305   42,845
Corporate bonds and notes          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 2,250   2,250   250
Unrealized Gains 0   0   0
Unrealized Losses 0   0   0
Estimated Fair Value 2,250   2,250   250
Amortized Cost [Abstract]          
Amortized Cost 2,250   2,250   250
Fair Value [Abstract]          
Estimated Fair Value 2,250   2,250   250
SBA loan pools          
Amortized cost and estimated fair value of securities available for sale [Abstract]          
Amortized Cost 20,247   20,247   15,712
Unrealized Gains 52   52   95
Unrealized Losses 100   100   46
Estimated Fair Value 20,199   20,199   15,761
Amortized Cost [Abstract]          
Without single maturity date 20,247   20,247    
Amortized Cost 20,247   20,247   15,712
Fair Value [Abstract]          
Without single maturity date 20,199   20,199    
Estimated Fair Value $ 20,199   $ 20,199   $ 15,761