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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details)
$ in Thousands
 1 Months Ended 6 Months Ended
Aug. 02, 2023
USD ($)
Jun. 30, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Available-for-sale: Unrealized Loss      
Less than 12 Months   $ (4,637) $ (37,977)
12 Months or More   (85,527) (53,061)
Total Unrealized Loss of Available-for-sale securities   (90,164) (91,038)
Held-to-maturity: Unrealized Loss      
Less than 12 Months     (22,823)
12 Months or More     (40,171)
Total Unrealized Loss of Held-to-maturity securities     (62,994)
Available-for-sale: Fair Value      
Less than 12 Months   123,018 531,226
12 Months or More   694,429 299,159
Total Fair Value Available-for-sale securities   $ 817,447 830,385
Held-to-maturity: Fair value      
Less than 12 Months     220,934
12 Months or More     239,252
Total Fair Value Held-to-maturity securities     460,186
Total: Unrealized Losses      
Less Than 12 Months     (60,800)
12 Months or More     (93,232)
Total Unrealized Losses     (154,032)
Total: Fair Value      
Less than 12 Months     752,160
12 Months or More     538,411
Total Fair Value     1,290,571
Number of securities in an unrealized loss position for a period of twelve months or more | item   587  
Number of securities in an unrealized loss position for a period of less than twelve months | item   350  
Proceeds from sales of securities available-for-sale $ 39,400 $ 145,844  
U.S. Treasury      
Available-for-sale: Unrealized Loss      
Less than 12 Months     (8,401)
12 Months or More   (14,648) (6,944)
Total Unrealized Loss of Available-for-sale securities   (14,648) (15,345)
Available-for-sale: Fair Value      
Less than 12 Months     92,445
12 Months or More   155,140 62,070
Total Fair Value Available-for-sale securities   155,140 154,515
U.S. government agency      
Available-for-sale: Unrealized Loss      
Less than 12 Months   (270) (2,980)
12 Months or More   (4,139) (1,154)
Total Unrealized Loss of Available-for-sale securities   (4,409) (4,134)
Held-to-maturity: Unrealized Loss      
Less than 12 Months     (1,754)
12 Months or More     (7,974)
Total Unrealized Loss of Held-to-maturity securities     (9,728)
Available-for-sale: Fair Value      
Less than 12 Months   7,973 47,370
12 Months or More   44,451 7,787
Total Fair Value Available-for-sale securities   52,424 55,157
Held-to-maturity: Fair value      
Less than 12 Months     15,751
12 Months or More     62,945
Total Fair Value Held-to-maturity securities     78,696
Municipal securities      
Available-for-sale: Unrealized Loss      
Less than 12 Months   (723) (10,906)
12 Months or More   (28,503) (21,283)
Total Unrealized Loss of Available-for-sale securities   (29,226) (32,189)
Held-to-maturity: Unrealized Loss      
Less than 12 Months     (314)
Total Unrealized Loss of Held-to-maturity securities     (314)
Available-for-sale: Fair Value      
Less than 12 Months   47,645 149,261
12 Months or More   192,219 87,794
Total Fair Value Available-for-sale securities   239,864 237,055
Held-to-maturity: Fair value      
Less than 12 Months     23,433
Total Fair Value Held-to-maturity securities     23,433
Mortgage-backed: Agency residential      
Available-for-sale: Unrealized Loss      
Less than 12 Months   (1,305) (8,332)
12 Months or More   (17,615) (9,908)
Total Unrealized Loss of Available-for-sale securities   (18,920) (18,240)
Held-to-maturity: Unrealized Loss      
Less than 12 Months     (4,039)
12 Months or More     (2,431)
Total Unrealized Loss of Held-to-maturity securities     (6,470)
Available-for-sale: Fair Value      
Less than 12 Months   36,555 127,288
12 Months or More   152,961 65,692
Total Fair Value Available-for-sale securities   189,516 192,980
Held-to-maturity: Fair value      
Less than 12 Months     78,452
12 Months or More     17,806
Total Fair Value Held-to-maturity securities     96,258
Mortgage-backed: Agency commercial      
Available-for-sale: Unrealized Loss      
Less than 12 Months   (345) (4,764)
12 Months or More   (16,694) (12,408)
Total Unrealized Loss of Available-for-sale securities   (17,039) (17,172)
Held-to-maturity: Unrealized Loss      
Less than 12 Months     (16,716)
12 Months or More     (29,766)
Total Unrealized Loss of Held-to-maturity securities     (46,482)
Available-for-sale: Fair Value      
Less than 12 Months   13,093 62,672
12 Months or More   117,701 70,216
Total Fair Value Available-for-sale securities   130,794 132,888
Held-to-maturity: Fair value      
Less than 12 Months     103,298
12 Months or More     158,501
Total Fair Value Held-to-maturity securities     261,799
Corporate      
Available-for-sale: Unrealized Loss      
Less than 12 Months   (1,994) (2,594)
12 Months or More   (3,928) (1,364)
Total Unrealized Loss of Available-for-sale securities   (5,922) (3,958)
Available-for-sale: Fair Value      
Less than 12 Months   17,752 52,190
12 Months or More   31,957 5,600
Total Fair Value Available-for-sale securities   $ 49,709 $ 57,790