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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities Available for Sale, Held to Maturity, and Equity Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Securities available for sale            
Amortized  Cost $ 781,946 $ 1,211,212        
Gross Unrealized Gains 739 598        
Gross Unrealized Losses (120,945) (189,525)        
Fair Value 661,740 1,022,285        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 512,277 543,351        
Gross Unrealized Gains 421 704        
Gross Unrealized Losses (61,504) (67,827)        
Fair Value 451,194 476,228        
Allowance 65 68 $ 65 $ 69 $ 71 $ 91
Equity securities, Amortized Cost 15,035 15,035        
Equity securities, Gross Unrealized Gains 0 0        
Equity securities, Gross Unrealized Losses (1,757) (2,006)        
Equity securities, Fair Value 13,278 13,029        
Amortized  Cost 1,309,258 1,769,598        
Gross Unrealized Gains 1,160 1,302        
Gross Unrealized Losses (184,206) (259,358)        
Fair Value 1,126,212 1,511,542        
Allowance 65 68        
U.S. Treasuries            
Securities available for sale            
Amortized  Cost 6,896 7,980        
Gross Unrealized Gains 11 1        
Gross Unrealized Losses 0 0        
Fair Value 6,907 7,981        
Allowance 0        
Municipal bonds and obligations            
Securities available for sale            
Amortized  Cost 64,050 64,788        
Gross Unrealized Gains 289 494        
Gross Unrealized Losses (1,408) (1,429)        
Fair Value 62,931 63,853        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 236,707 251,046        
Gross Unrealized Gains 421 698        
Gross Unrealized Losses (17,087) (16,987)        
Fair Value 220,041 234,757        
Allowance 45 48 45 48 49 66
Agency collateralized mortgage obligations            
Securities available for sale            
Amortized  Cost 308,857 426,986        
Gross Unrealized Gains 340 0        
Gross Unrealized Losses (56,765) (79,112)        
Fair Value 252,432 347,874        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 103,272 112,929        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (15,332) (18,360)        
Fair Value 87,940 94,569        
Allowance 0 0        
Agency mortgage-backed securities            
Securities available for sale            
Amortized  Cost 276,077 492,633        
Gross Unrealized Gains 9 2        
Gross Unrealized Losses (43,155) (75,155)        
Fair Value 232,931 417,480        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 44,465 47,379        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (7,048) (8,052)        
Fair Value 37,417 39,327        
Allowance 0 0        
Agency commercial mortgage-backed securities            
Securities available for sale            
Amortized  Cost 86,714 174,879        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (16,148) (29,553)        
Fair Value 70,566 145,326        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 126,312 130,169        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses (22,001) (24,368)        
Fair Value 104,311 105,801        
Allowance 0 0        
Corporate bonds            
Securities available for sale            
Amortized  Cost 38,697 43,291        
Gross Unrealized Gains 23 34        
Gross Unrealized Losses (3,403) (4,210)        
Fair Value 35,317 39,115        
Allowance 0 0        
Other bonds and obligations            
Securities available for sale            
Amortized  Cost 655 655        
Gross Unrealized Gains 67 67        
Gross Unrealized Losses (66) (66)        
Fair Value 656 656        
Allowance 0 0        
Securities held to maturity            
Amortized  Cost 277 288        
Gross Unrealized Gains 0 0        
Gross Unrealized Losses 0 0        
Fair Value 277 288        
Allowance 0 0        
Tax advantaged economic development bonds            
Securities held to maturity            
Amortized  Cost 1,244 1,540        
Gross Unrealized Gains 0 6        
Gross Unrealized Losses (36) (60)        
Fair Value 1,208 1,486        
Allowance $ 20 $ 20 $ 20 $ 21 $ 22 $ 25