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SECURITIES (Securities available for sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains $ 94,955 $ 127,866
Gross Unrealized Losses (61,162) (24,116)
Equity securities with a readily determinable fair value 20,790 19,629
Amortized Cost, Total 7,416,143 6,024,225
Estimated Fair Value, Total 7,449,936 6,127,975
Total debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,395,353 6,004,596
Gross Unrealized Gains 94,955 127,866
Gross Unrealized Losses (61,162) (24,116)
Estimated Fair Value 7,429,146 6,108,346
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 997 1,995
Gross Unrealized Gains 16 31
Gross Unrealized Losses 0 0
Estimated Fair Value 1,013 2,026
U.S. agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 35,453 167,048
Gross Unrealized Gains 208 657
Gross Unrealized Losses (628) (926)
Estimated Fair Value 35,033 166,779
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,790,972 1,562,631
Gross Unrealized Gains 53,601 75,555
Gross Unrealized Losses (21,108) (2,959)
Estimated Fair Value 1,823,465 1,635,227
Mortgage-backed securities - agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,387,792 1,351,964
Gross Unrealized Gains 17,104 16,029
Gross Unrealized Losses (33,632) (12,723)
Estimated Fair Value 2,371,264 1,355,270
Mortgage-backed securities - non-agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,619,636 1,428,068
Gross Unrealized Gains 9,760 22,688
Gross Unrealized Losses (1,493) (1,640)
Estimated Fair Value 1,627,903 1,449,116
Commercial mortgage-backed securities - agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 128,609 171,451
Gross Unrealized Gains 2,021 3,440
Gross Unrealized Losses (2,769) (738)
Estimated Fair Value 127,861 174,153
Commercial mortgage-backed securities - non-agency    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 560,445 253,421
Gross Unrealized Gains 1,612 37
Gross Unrealized Losses (390) (691)
Estimated Fair Value 561,667 252,767
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 868,215 1,064,255
Gross Unrealized Gains 10,570 9,421
Gross Unrealized Losses (1,139) (4,410)
Estimated Fair Value 877,646 1,069,266
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,234 3,763
Gross Unrealized Gains 63 8
Gross Unrealized Losses (3) (29)
Estimated Fair Value $ 3,294 $ 3,742