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DEBT SECURITIES - Schedule of Amortized Cost, Unrealized or Unrecognized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt securities available for sale    
Amortized Cost $ 2,394,664 $ 2,039,952
Gross unrealized gains 5,356 594
Gross unrealized losses (182,232) (230,325)
Fair Value 2,217,788 1,810,221
Debt securities held to maturity    
Amortized Cost 802,965 826,630
Gross unrecognized gains 0 0
Gross unrecognized losses (132,433) (151,577)
Fair Value 670,532 675,053
Obligations of U.S. government corporations and agencies    
Debt securities available for sale    
Amortized Cost 115,902 1,408
Gross unrealized gains 59 0
Gross unrealized losses (404) (8)
Fair Value 115,557 1,400
Obligations of states and political subdivisions    
Debt securities available for sale    
Amortized Cost 260,997 156,534
Gross unrealized gains 131 31
Gross unrealized losses (18,975) (16,736)
Fair Value 242,153 139,829
Asset-backed securities    
Debt securities available for sale    
Amortized Cost 373,231 336,379
Gross unrealized gains 390 181
Gross unrealized losses 0 (3)
Fair Value 373,621 336,557
Commercial mortgage-backed securities    
Debt securities available for sale    
Amortized Cost 149,844 107,305
Gross unrealized gains 479 0
Gross unrealized losses (12,297) (15,131)
Fair Value 138,026 92,174
Debt securities held to maturity    
Amortized Cost 407,401 415,530
Gross unrecognized gains 0 0
Gross unrecognized losses (70,772) (77,242)
Fair Value 336,629 338,288
Residential mortgage-backed securities    
Debt securities available for sale    
Amortized Cost 1,433,077 1,279,090
Gross unrealized gains 3,870 19
Gross unrealized losses (147,818) (191,899)
Fair Value 1,289,129 1,087,210
Debt securities held to maturity    
Amortized Cost 395,564 411,100
Gross unrecognized gains 0 0
Gross unrecognized losses (61,661) (74,335)
Fair Value 333,903 336,765
Corporate debt securities    
Debt securities available for sale    
Amortized Cost 61,613 159,236
Gross unrealized gains 427 363
Gross unrealized losses (2,738) (6,548)
Fair Value $ 59,302 $ 153,051