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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
item
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
item
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Available-for-sale: Unrealized Loss          
Less than 12 Months $ (49,849)   $ (49,849)   $ (7,334)
12 Months or More (13,769)   (13,769)   (1,654)
Total Unrealized Loss of Available-for-sale securities (63,618)   (63,618)   (8,988)
Held-to-maturity: Unrealized Loss          
Less than 12 Months (35,679)   (35,679)   (2,826)
12 Months or More (3,102)   (3,102)   (128)
Total Unrealized Loss of Held-to-maturity securities (38,781)   (38,781)   (2,954)
Available-for-sale: Fair Value          
Less than 12 Months 758,593   758,593   445,604
12 Months or More 81,617   81,617   38,324
Total Fair Value Available-for-sale securities 840,210   840,210   483,928
Held-to-maturity: Fair value          
Less than 12 Months 396,417   396,417   194,309
12 Months or More 44,514   44,514   2,776
Total Fair Value Held-to-maturity securities 440,931   440,931   197,085
Total: Unrealized Losses          
Less Than 12 Months (85,528)   (85,528)   (10,160)
12 Months or More (16,871)   (16,871)   (1,782)
Total Unrealized Losses (102,399)   (102,399)   (11,942)
Total: Fair Value          
Less than 12 Months 1,155,010   1,155,010   639,913
12 Months or More 126,131   126,131   41,100
Total Fair Value $ 1,281,141   $ 1,281,141   681,013
Number of securities in an unrealized loss position for a period of twelve months or more | item 87   87    
Number of securities in an unrealized loss position for a period of less than twelve months | item 603   603    
Proceeds from sales of securities available-for-sale $ 0 $ 0 $ 0 $ 0  
U.S. Treasury          
Available-for-sale: Unrealized Loss          
Less than 12 Months (10,725)   (10,725)   (354)
Total Unrealized Loss of Available-for-sale securities (10,725)   (10,725)   (354)
Available-for-sale: Fair Value          
Less than 12 Months 159,205   159,205   68,410
Total Fair Value Available-for-sale securities 159,205   159,205   68,410
U.S. government agency          
Available-for-sale: Unrealized Loss          
Less than 12 Months (2,156)   (2,156)   (2,183)
12 Months or More         (284)
Total Unrealized Loss of Available-for-sale securities (2,156)   (2,156)   (2,467)
Held-to-maturity: Unrealized Loss          
Less than 12 Months (2,564)   (2,564)   (51)
12 Months or More (2,800)   (2,800)    
Total Unrealized Loss of Held-to-maturity securities (5,364)   (5,364)   (51)
Available-for-sale: Fair Value          
Less than 12 Months 58,197   58,197   80,219
12 Months or More         5,578
Total Fair Value Available-for-sale securities 58,197   58,197   85,797
Held-to-maturity: Fair value          
Less than 12 Months 40,773   40,773   4,949
12 Months or More 42,276   42,276    
Total Fair Value Held-to-maturity securities 83,049   83,049   4,949
Municipal securities          
Available-for-sale: Unrealized Loss          
Less than 12 Months (15,751)   (15,751)   (2,018)
12 Months or More (9,910)   (9,910)   (886)
Total Unrealized Loss of Available-for-sale securities (25,661)   (25,661)   (2,904)
Held-to-maturity: Unrealized Loss          
Less than 12 Months (66)   (66)    
Total Unrealized Loss of Held-to-maturity securities (66)   (66)    
Available-for-sale: Fair Value          
Less than 12 Months 176,771   176,771   89,424
12 Months or More 50,424   50,424   17,327
Total Fair Value Available-for-sale securities 227,195   227,195   106,751
Held-to-maturity: Fair value          
Less than 12 Months 6,513   6,513    
Total Fair Value Held-to-maturity securities 6,513   6,513    
Mortgage-backed: Agency residential          
Available-for-sale: Unrealized Loss          
Less than 12 Months (11,320)   (11,320)   (851)
12 Months or More (306)   (306)   (68)
Total Unrealized Loss of Available-for-sale securities (11,626)   (11,626)   (919)
Held-to-maturity: Unrealized Loss          
Less than 12 Months (1,971)   (1,971)   (102)
Total Unrealized Loss of Held-to-maturity securities (1,971)   (1,971)   (102)
Available-for-sale: Fair Value          
Less than 12 Months 203,603   203,603   91,703
12 Months or More 4,556   4,556   4,305
Total Fair Value Available-for-sale securities 208,159   208,159   96,008
Held-to-maturity: Fair value          
Less than 12 Months 74,978   74,978   14,932
Total Fair Value Held-to-maturity securities 74,978   74,978   14,932
Mortgage-backed: Agency commercial          
Available-for-sale: Unrealized Loss          
Less than 12 Months (8,812)   (8,812)   (1,921)
12 Months or More (2,543)   (2,543)   (127)
Total Unrealized Loss of Available-for-sale securities (11,355)   (11,355)   (2,048)
Held-to-maturity: Unrealized Loss          
Less than 12 Months (31,078)   (31,078)   (2,673)
12 Months or More (302)   (302)   (128)
Total Unrealized Loss of Held-to-maturity securities (31,380)   (31,380)   (2,801)
Available-for-sale: Fair Value          
Less than 12 Months 114,025   114,025   113,111
12 Months or More 22,685   22,685   6,443
Total Fair Value Available-for-sale securities 136,710   136,710   119,554
Held-to-maturity: Fair value          
Less than 12 Months 274,153   274,153   174,428
12 Months or More 2,238   2,238   2,776
Total Fair Value Held-to-maturity securities 276,391   276,391   177,204
Corporate          
Available-for-sale: Unrealized Loss          
Less than 12 Months (1,085)   (1,085)   (7)
12 Months or More (1,010)   (1,010)   (289)
Total Unrealized Loss of Available-for-sale securities (2,095)   (2,095)   (296)
Available-for-sale: Fair Value          
Less than 12 Months 46,792   46,792   2,737
12 Months or More 3,952   3,952   4,671
Total Fair Value Available-for-sale securities $ 50,744   $ 50,744   $ 7,408