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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost $ 83,070 $ 84,021
Debt Securities, Held-to-maturity, Fair Value 75,762 76,485
Debt Securities, Available-for-sale, Amortized Cost 3,763,658 3,827,418
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 3,384,949 3,409,648
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 509,211 1,502,821
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 3,422
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,689,102 1,785,690
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 361,464 329,398
Debt Securities, Available-for-Sale, Unrealized Loss Position 3,198,313 3,288,511
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 380,988 418,604
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 36,215
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 69,282 37,399
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,480 4,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 69,282 73,614
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 7,480 7,641
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 19,524 89,206
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 0 0
Debt Securities, Held-to-maturity, Fair Value 0 0
Debt Securities, Available-for-sale, Amortized Cost 37,319 37,312
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 33,421 32,696
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 2,397 2,383
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 31,024 30,313
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3,864 4,570
Debt Securities, Available-for-Sale, Unrealized Loss Position 33,421 32,696
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,898 4,616
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 34 46
Securities of U.S. government agencies and corporations    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 0 0
Debt Securities, Held-to-maturity, Fair Value 0 0
Debt Securities, Available-for-sale, Amortized Cost 80,728 80,382
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 67,765 66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 67,765 66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12,963 13,914
Debt Securities, Available-for-Sale, Unrealized Loss Position 67,765 66,468
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 12,963 13,914
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Residential Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 0 0
Debt Securities, Held-to-maturity, Fair Value 0 0
Debt Securities, Available-for-sale, Amortized Cost 734,761 747,478
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 649,243 650,063
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 119,487 195,972
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 490,241 443,415
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 82,144 87,049
Debt Securities, Available-for-Sale, Unrealized Loss Position 609,728 639,387
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 86,142 97,462
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,998 10,413
Commercial Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 34,659 35,363
Debt Securities, Held-to-maturity, Fair Value 30,678 31,249
Debt Securities, Available-for-sale, Amortized Cost 669,015 676,934
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 624,894 629,562
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 84,064 440,207
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 2,197
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 540,830 175,530
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 41,334 28,551
Debt Securities, Available-for-Sale, Unrealized Loss Position 624,894 615,737
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 44,121 47,374
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 17,656
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 30,678 13,593
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3,981 1,917
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 30,678 31,249
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 3,981 4,114
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,787 18,823
Collateralized Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 9,030 9,280
Debt Securities, Held-to-maturity, Fair Value 8,346 8,453
Debt Securities, Available-for-sale, Amortized Cost 524,394 538,970
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 465,115 477,712
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 89,481 199,138
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 606
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 366,249 269,242
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 55,916 48,986
Debt Securities, Available-for-Sale, Unrealized Loss Position 455,730 468,380
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 59,400 61,439
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 6,317
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 8,346 2,136
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 684 221
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 8,346 8,453
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 684 827
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,484 12,453
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 8,131 8,128
Debt Securities, Held-to-maturity, Fair Value 8,117 8,032
Debt Securities, Available-for-sale, Amortized Cost 828,948 832,066
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 719,175 708,463
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 65,220 295,913
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 201
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 537,923 368,673
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 107,187 92,972
Debt Securities, Available-for-Sale, Unrealized Loss Position 603,143 664,586
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 111,128 124,168
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 5,160
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,637 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 186 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 1,637 5,160
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 186 201
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,941 31,196
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 0 0
Debt Securities, Held-to-maturity, Fair Value 0 0
Debt Securities, Available-for-sale, Amortized Cost 746,463 772,261
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 695,075 711,325
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 100,004 250,946
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 573,501 422,090
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 48,729 51,565
Debt Securities, Available-for-Sale, Unrealized Loss Position 673,505 673,036
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 51,567 60,975
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,838 9,410
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Amortized Cost 31,250 31,250
Debt Securities, Held-to-maturity, Fair Value 28,621 28,751
Debt Securities, Available-for-sale, Amortized Cost 142,030 142,015
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) 130,261 133,359
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 48,558 118,262
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 418
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 81,569 9,959
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,327 1,791
Debt Securities, Available-for-Sale, Unrealized Loss Position 130,127 128,221
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11,769 8,656
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 7,082
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 28,621 21,670
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,629 2,081
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 28,621 28,752
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 2,629 2,499
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 2,442 $ 6,865