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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Available-for-sale: Unrealized Loss    
Less than 12 Months $ (31,217) $ (7,334)
12 Months or More (9,682) (1,654)
Total Unrealized Loss of Available-for-sale securities (40,899) (8,988)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (21,817) (2,826)
12 Months or More (245) (128)
Total Unrealized Loss of Held-to-maturity securities (22,062) (2,954)
Available-for-sale: Fair Value    
Less than 12 Months 677,460 445,604
12 Months or More 85,870 38,324
Total Fair Value Available-for-sale securities 763,330 483,928
Held-to-maturity: Fair value    
Less than 12 Months 284,458 194,309
12 Months or More 2,363 2,776
Total Fair Value Held-to-maturity securities 286,821 197,085
Total: Unrealized Losses    
Less Than 12 Months (53,034) (10,160)
12 Months or More (9,927) (1,782)
Total Unrealized Losses (62,961) (11,942)
Total: Fair Value    
Less than 12 Months 961,918 639,913
12 Months or More 88,233 41,100
Total Fair Value $ 1,050,151 681,013
Number of securities in an unrealized loss position for a period of twelve months or more | item 75  
Number of securities in an unrealized loss position for a period of less than twelve months | item 465  
U.S. Treasury    
Available-for-sale: Unrealized Loss    
Less than 12 Months $ (7,329) (354)
Total Unrealized Loss of Available-for-sale securities (7,329) (354)
Available-for-sale: Fair Value    
Less than 12 Months 162,637 68,410
Total Fair Value Available-for-sale securities 162,637 68,410
U.S. government agency    
Available-for-sale: Unrealized Loss    
Less than 12 Months (1,181) (2,183)
12 Months or More   (284)
Total Unrealized Loss of Available-for-sale securities (1,181) (2,467)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (722) (51)
Total Unrealized Loss of Held-to-maturity securities (722) (51)
Available-for-sale: Fair Value    
Less than 12 Months 42,715 80,219
12 Months or More   5,578
Total Fair Value Available-for-sale securities 42,715 85,797
Held-to-maturity: Fair value    
Less than 12 Months 11,636 4,949
Total Fair Value Held-to-maturity securities 11,636 4,949
Municipal securities    
Available-for-sale: Unrealized Loss    
Less than 12 Months (9,031) (2,018)
12 Months or More (6,722) (886)
Total Unrealized Loss of Available-for-sale securities (15,753) (2,904)
Available-for-sale: Fair Value    
Less than 12 Months 157,069 89,424
12 Months or More 53,718 17,327
Total Fair Value Available-for-sale securities 210,787 106,751
Mortgage-backed: Agency residential    
Available-for-sale: Unrealized Loss    
Less than 12 Months (7,647) (851)
12 Months or More (150) (68)
Total Unrealized Loss of Available-for-sale securities (7,797) (919)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (947) (102)
Total Unrealized Loss of Held-to-maturity securities (947) (102)
Available-for-sale: Fair Value    
Less than 12 Months 191,824 91,703
12 Months or More 3,931 4,305
Total Fair Value Available-for-sale securities 195,755 96,008
Held-to-maturity: Fair value    
Less than 12 Months 17,789 14,932
Total Fair Value Held-to-maturity securities 17,789 14,932
Mortgage-backed: Agency commercial    
Available-for-sale: Unrealized Loss    
Less than 12 Months (5,579) (1,921)
12 Months or More (2,040) (127)
Total Unrealized Loss of Available-for-sale securities (7,619) (2,048)
Held-to-maturity: Unrealized Loss    
Less than 12 Months (20,148) (2,673)
12 Months or More (245) (128)
Total Unrealized Loss of Held-to-maturity securities (20,393) (2,801)
Available-for-sale: Fair Value    
Less than 12 Months 108,665 113,111
12 Months or More 24,031 6,443
Total Fair Value Available-for-sale securities 132,696 119,554
Held-to-maturity: Fair value    
Less than 12 Months 255,033 174,428
12 Months or More 2,363 2,776
Total Fair Value Held-to-maturity securities 257,396 177,204
Corporate    
Available-for-sale: Unrealized Loss    
Less than 12 Months (450) (7)
12 Months or More (770) (289)
Total Unrealized Loss of Available-for-sale securities (1,220) (296)
Available-for-sale: Fair Value    
Less than 12 Months 14,550 2,737
12 Months or More 4,190 4,671
Total Fair Value Available-for-sale securities $ 18,740 $ 7,408