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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Available-for-sale: Unrealized Loss    
Less than 12 Months $ (5,689) $ (1,061)
12 Months or More (1,115) (30)
Total Unrealized Loss of Available-for-sale securities (6,804) (1,091)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (1,609) (18)
12 Months or More (120)  
Total Unrealized Loss of Held-to-maturity securities (1,729) (18)
Available-for-sale: Fair Value    
Less than 12 Months 329,108 107,933
12 Months or More 28,622 7,939
Total Fair Value Available-for-sale securities 357,730 115,872
Held-to-maturity: Fair value    
Less than 12 Months 134,271 2,983
12 Months or More 2,793  
Total Fair Value Held-to-maturity securities 137,064 2,983
Total: Unrealized Losses    
Less Than 12 Months (7,298) (1,079)
12 Months or More (1,235) (30)
Total Unrealized Losses (8,533) (1,109)
Total: Fair Value    
Less than 12 Months 463,379 110,916
12 Months or More 31,415 7,939
Total Fair Value $ 494,794 118,855
Number of securities in an unrealized loss position for a period of twelve months or more | item 32  
Number of securities in an unrealized loss position for a period of less than twelve months | item 189  
U.S. Treasury    
Available-for-sale: Unrealized Loss    
Less than 12 Months $ (22)  
Total Unrealized Loss of Available-for-sale securities (22)  
Available-for-sale: Fair Value    
Less than 12 Months 9,926  
Total Fair Value Available-for-sale securities 9,926  
U.S. government agency    
Available-for-sale: Unrealized Loss    
Less than 12 Months (2,295) (9)
Total Unrealized Loss of Available-for-sale securities (2,295) (9)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (12)  
Total Unrealized Loss of Held-to-maturity securities (12)  
Available-for-sale: Fair Value    
Less than 12 Months 70,210 5,919
Total Fair Value Available-for-sale securities 70,210 5,919
Held-to-maturity: Fair value    
Less than 12 Months 4,988  
Total Fair Value Held-to-maturity securities 4,988  
Municipal securities    
Available-for-sale: Unrealized Loss    
Less than 12 Months (2,066) (280)
12 Months or More (670)  
Total Unrealized Loss of Available-for-sale securities (2,736) (280)
Available-for-sale: Fair Value    
Less than 12 Months 112,240 19,652
12 Months or More 12,406  
Total Fair Value Available-for-sale securities 124,646 19,652
Mortgage-backed: Agency residential    
Available-for-sale: Unrealized Loss    
Less than 12 Months (323) (142)
12 Months or More (48) (20)
Total Unrealized Loss of Available-for-sale securities (371) (162)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (1)  
Total Unrealized Loss of Held-to-maturity securities (1)  
Available-for-sale: Fair Value    
Less than 12 Months 47,264 20,387
12 Months or More 4,649 4,490
Total Fair Value Available-for-sale securities 51,913 24,877
Held-to-maturity: Fair value    
Less than 12 Months 1,570  
Total Fair Value Held-to-maturity securities 1,570  
Mortgage-backed: Agency commercial    
Available-for-sale: Unrealized Loss    
Less than 12 Months (983) (524)
12 Months or More (117) (10)
Total Unrealized Loss of Available-for-sale securities (1,100) (534)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (1,596) (18)
12 Months or More (120)  
Total Unrealized Loss of Held-to-maturity securities (1,716) (18)
Available-for-sale: Fair Value    
Less than 12 Months 89,468 57,126
12 Months or More 6,888 3,449
Total Fair Value Available-for-sale securities 96,356 60,575
Held-to-maturity: Fair value    
Less than 12 Months 127,713 2,983
12 Months or More 2,793  
Total Fair Value Held-to-maturity securities 130,506 2,983
Corporate    
Available-for-sale: Unrealized Loss    
Less than 12 Months   (106)
12 Months or More (280)  
Total Unrealized Loss of Available-for-sale securities (280) (106)
Available-for-sale: Fair Value    
Less than 12 Months   4,849
12 Months or More 4,679  
Total Fair Value Available-for-sale securities $ 4,679 $ 4,849