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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Available-for-sale: Unrealized Loss      
Less than 12 Months $ (37,977) $ (7,334)  
12 Months or More (53,061) (1,654)  
Total Unrealized Loss of Available-for-sale securities (91,038) (8,988)  
Held-to-maturity: Unrealized Loss      
Less than 12 Months (22,823) (2,826)  
12 Months or More (40,171) (128)  
Total Unrealized Loss of Held-to-maturity securities (62,994) (2,954)  
Available-for-sale: Fair Value      
Less than 12 Months 531,226 445,604  
12 Months or More 299,159 38,324  
Total Fair Value Available-for-sale securities 830,385 483,928  
Held-to-maturity: Fair value      
Less than 12 Months 220,934 194,309  
12 Months or More 239,252 2,776  
Total Fair Value Held-to-maturity securities 460,186 197,085  
Total: Unrealized Losses      
Less Than 12 Months (60,800) (10,160)  
12 Months or More (93,232) (1,782)  
Total Unrealized Losses (154,032) (11,942)  
Total: Fair Value      
Less than 12 Months 752,160 639,913  
12 Months or More 538,411 41,100  
Total Fair Value $ 1,290,571 681,013  
Number of securities in an unrealized loss position for a period of twelve months or more | item 261    
Number of securities in an unrealized loss position for a period of less than twelve months | item 519    
Proceeds from sales of securities available-for-sale $ 0 0 $ 0
U.S. Treasury      
Available-for-sale: Unrealized Loss      
Less than 12 Months (8,401) (354)  
12 Months or More (6,944)    
Total Unrealized Loss of Available-for-sale securities (15,345) (354)  
Available-for-sale: Fair Value      
Less than 12 Months 92,445 68,410  
12 Months or More 62,070    
Total Fair Value Available-for-sale securities 154,515 68,410  
U.S. government agency      
Available-for-sale: Unrealized Loss      
Less than 12 Months (2,980) (2,183)  
12 Months or More (1,154) (284)  
Total Unrealized Loss of Available-for-sale securities (4,134) (2,467)  
Held-to-maturity: Unrealized Loss      
Less than 12 Months (1,754) (51)  
12 Months or More (7,974)    
Total Unrealized Loss of Held-to-maturity securities (9,728) (51)  
Available-for-sale: Fair Value      
Less than 12 Months 47,370 80,219  
12 Months or More 7,787 5,578  
Total Fair Value Available-for-sale securities 55,157 85,797  
Held-to-maturity: Fair value      
Less than 12 Months 15,751 4,949  
12 Months or More 62,945    
Total Fair Value Held-to-maturity securities 78,696 4,949  
Municipal securities      
Available-for-sale: Unrealized Loss      
Less than 12 Months (10,906) (2,018)  
12 Months or More (21,283) (886)  
Total Unrealized Loss of Available-for-sale securities (32,189) (2,904)  
Available-for-sale: Fair Value      
Less than 12 Months 149,261 89,424  
12 Months or More 87,794 17,327  
Total Fair Value Available-for-sale securities 237,055 106,751  
Total: Unrealized Losses      
Less Than 12 Months (314)    
Total Unrealized Losses (314)    
Total: Fair Value      
Less than 12 Months 23,433    
Total Fair Value 23,433    
Mortgage-backed: Agency residential      
Available-for-sale: Unrealized Loss      
Less than 12 Months (8,332) (851)  
12 Months or More (9,908) (68)  
Total Unrealized Loss of Available-for-sale securities (18,240) (919)  
Held-to-maturity: Unrealized Loss      
Less than 12 Months (4,039) (102)  
12 Months or More (2,431)    
Total Unrealized Loss of Held-to-maturity securities (6,470) (102)  
Available-for-sale: Fair Value      
Less than 12 Months 127,288 91,703  
12 Months or More 65,692 4,305  
Total Fair Value Available-for-sale securities 192,980 96,008  
Held-to-maturity: Fair value      
Less than 12 Months 78,452 14,932  
12 Months or More 17,806    
Total Fair Value Held-to-maturity securities 96,258 14,932  
Mortgage-backed: Agency commercial      
Available-for-sale: Unrealized Loss      
Less than 12 Months (4,764) (1,921)  
12 Months or More (12,408) (127)  
Total Unrealized Loss of Available-for-sale securities (17,172) (2,048)  
Held-to-maturity: Unrealized Loss      
Less than 12 Months (16,716) (2,673)  
12 Months or More (29,766) (128)  
Total Unrealized Loss of Held-to-maturity securities (46,482) (2,801)  
Available-for-sale: Fair Value      
Less than 12 Months 62,672 113,111  
12 Months or More 70,216 6,443  
Total Fair Value Available-for-sale securities 132,888 119,554  
Held-to-maturity: Fair value      
Less than 12 Months 103,298 174,428  
12 Months or More 158,501 2,776  
Total Fair Value Held-to-maturity securities 261,799 177,204  
Corporate      
Available-for-sale: Unrealized Loss      
Less than 12 Months (2,594) (7)  
12 Months or More (1,364) (289)  
Total Unrealized Loss of Available-for-sale securities (3,958) (296)  
Available-for-sale: Fair Value      
Less than 12 Months 52,190 2,737  
12 Months or More 5,600 4,671  
Total Fair Value Available-for-sale securities $ 57,790 $ 7,408