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SECURITIES (Debt securities available for sale) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 558,364 $ 2,259,415
Unrealized Losses, Less than 12 months $ (43,612) $ (147,396)
Count, Less than 12 months | security 33 243
Fair Value, 12 months or longer $ 4,525,733 $ 3,037,801
Unrealized Losses, 12 months or longer $ (703,049) $ (495,684)
Count, 12 months or longer | security 484 284
Fair Value, Total $ 5,084,097 $ 5,297,216
Unrealized Losses, Total $ (746,661) $ (643,080)
Count, Total | security 517 527
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 5,917 $ 28,699
Unrealized Losses, Less than 12 months $ (72) $ (678)
Count, Less than 12 months | security 2 4
Fair Value, 12 months or longer $ 25,888 $ 0
Unrealized Losses, 12 months or longer $ (559) $ 0
Count, 12 months or longer | security 3 0
Fair Value, Total $ 31,805 $ 28,699
Unrealized Losses, Total $ (631) $ (678)
Count, Total | security 5 4
U.S. agencies    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 0 $ 16,487
Unrealized Losses, Less than 12 months $ 0 $ (222)
Count, Less than 12 months | security 0 5
Fair Value, 12 months or longer $ 41,104 $ 26,648
Unrealized Losses, 12 months or longer $ (6,918) $ (6,080)
Count, 12 months or longer | security 6 2
Fair Value, Total $ 41,104 $ 43,135
Unrealized Losses, Total $ (6,918) $ (6,302)
Count, Total | security 6 7
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 3,360 $ 288,457
Unrealized Losses, Less than 12 months $ (470) $ (28,378)
Count, Less than 12 months | security 4 69
Fair Value, 12 months or longer $ 771,031 $ 589,641
Unrealized Losses, 12 months or longer $ (207,413) $ (141,777)
Count, 12 months or longer | security 163 113
Fair Value, Total $ 774,391 $ 878,098
Unrealized Losses, Total $ (207,883) $ (170,155)
Count, Total | security 167 182
Mortgage-backed securities - agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 1,958 $ 241,288
Unrealized Losses, Less than 12 months $ (62) $ (21,420)
Count, Less than 12 months | security 11 99
Fair Value, 12 months or longer $ 1,591,796 $ 1,528,951
Unrealized Losses, 12 months or longer $ (316,316) $ (248,623)
Count, 12 months or longer | security 215 126
Fair Value, Total $ 1,593,754 $ 1,770,239
Unrealized Losses, Total $ (316,378) $ (270,043)
Count, Total | security 226 225
Mortgage-backed securities - non-agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 488,800 $ 950,054
Unrealized Losses, Less than 12 months $ (41,299) $ (70,213)
Count, Less than 12 months | security 14 25
Fair Value, 12 months or longer $ 1,282,494 $ 693,531
Unrealized Losses, 12 months or longer $ (122,063) $ (76,636)
Count, 12 months or longer | security 43 25
Fair Value, Total $ 1,771,294 $ 1,643,585
Unrealized Losses, Total $ (163,362) $ (146,849)
Count, Total | security 57 50
Commercial mortgage-backed securities - agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 0 $ 27,732
Unrealized Losses, Less than 12 months $ 0 $ (2,291)
Count, Less than 12 months | security 0 12
Fair Value, 12 months or longer $ 81,444 $ 57,392
Unrealized Losses, 12 months or longer $ (17,053) $ (13,104)
Count, 12 months or longer | security 19 7
Fair Value, Total $ 81,444 $ 85,124
Unrealized Losses, Total $ (17,053) $ (15,395)
Count, Total | security 19 19
Commercial mortgage-backed securities - non-agency    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 9,695 $ 530,541
Unrealized Losses, Less than 12 months $ (344) $ (16,830)
Count, Less than 12 months | security 1 15
Fair Value, 12 months or longer $ 584,871 $ 84,619
Unrealized Losses, 12 months or longer $ (18,386) $ (3,222)
Count, 12 months or longer | security 17 4
Fair Value, Total $ 594,566 $ 615,160
Unrealized Losses, Total $ (18,730) $ (20,052)
Count, Total | security 18 19
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 0 $ 118,613
Unrealized Losses, Less than 12 months $ 0 $ (6,107)
Count, Less than 12 months | security 0 7
Fair Value, 12 months or longer $ 139,217 $ 56,621
Unrealized Losses, 12 months or longer $ (13,031) $ (6,236)
Count, 12 months or longer | security 11 6
Fair Value, Total $ 139,217 $ 175,234
Unrealized Losses, Total $ (13,031) $ (12,343)
Count, Total | security 11 13
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 48,634 $ 57,544
Unrealized Losses, Less than 12 months $ (1,365) $ (1,257)
Count, Less than 12 months | security 1 7
Fair Value, 12 months or longer $ 7,888 $ 398
Unrealized Losses, 12 months or longer $ (1,310) $ (6)
Count, 12 months or longer | security 7 1
Fair Value, Total $ 56,522 $ 57,942
Unrealized Losses, Total $ (2,675) $ (1,263)
Count, Total | security 8 8