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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Stockholders' equity | $ $ 603,340 $ 614,464 $ 588,298 $ 581,145
Residential mortgage backed securities ('MBS) and collateralized mortgage obligations (CMOs)        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, available-for-sale, number of positions 83 76    
Debt securities, available-for-sale, unrealized loss position, number of positions 65 45    
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions 27 25    
Held-to-maturity securities, number of positions 7 7    
Held-to-maturity securities, unrealized loss position, number of positions 0      
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, number of positions   2    
Commercial MBS and CMOs        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, available-for-sale, number of positions 43 42    
Debt securities, available-for-sale, unrealized loss position, number of positions 19 19    
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions 9 8    
Agency bonds        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, available-for-sale, number of positions 14 15    
Debt securities, available-for-sale, unrealized loss position, number of positions 2 12    
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions 0 9    
Accumulated Other Comprehensive (Loss) Income (Net of Taxes) Available for Sale Securities        
Debt Securities, Available-for-sale [Line Items]        
Stockholders' equity | $ $ 2,190 $ 1,444 (2,756) (4,935)
Unrealized gain on available-for-sale investment securities tax liability | $ 898 593    
Retained Earnings        
Debt Securities, Available-for-sale [Line Items]        
Stockholders' equity | $ $ 169,572 $ 165,236 $ 138,123 $ 129,806