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DEBT SECURITIES - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt securities available for sale    
Amortized Cost $ 2,146,276 $ 2,334,630
Gross unrealized gains 108 186
Gross unrealized losses (248,312) (247,245)
Fair Value 1,898,072 2,087,571
Debt securities held to maturity    
Amortized Cost 862,218 872,628
Gross unrealized gains 0 0
Gross unrealized losses (149,187) (142,231)
Fair Value 713,031 730,397
U.S. Treasury securities    
Debt securities available for sale    
Amortized Cost 749 16,031
Gross unrealized gains 0 0
Gross unrealized losses (7) (85)
Fair Value 742 15,946
Obligations of U.S. government corporations and agencies    
Debt securities available for sale    
Amortized Cost 5,777 5,889
Gross unrealized gains 1 1
Gross unrealized losses (35) (58)
Fair Value 5,743 5,832
Obligations of states and political subdivisions    
Debt securities available for sale    
Amortized Cost 168,997 190,819
Gross unrealized gains 20 52
Gross unrealized losses (18,091) (18,026)
Fair Value 150,926 172,845
Asset-backed securities    
Debt securities available for sale    
Amortized Cost 462,082 470,046
Gross unrealized gains 0 0
Gross unrealized losses (384) (1,823)
Fair Value 461,698 468,223
Commercial mortgage-backed securities    
Debt securities available for sale    
Amortized Cost 108,006 119,044
Gross unrealized gains 0 0
Gross unrealized losses (15,443) (15,535)
Fair Value 92,563 103,509
Debt securities held to maturity    
Amortized Cost 424,946 428,526
Gross unrealized gains 0 0
Gross unrealized losses (74,590) (71,000)
Fair Value 350,356 357,526
Residential mortgage-backed securities    
Debt securities available for sale    
Amortized Cost 1,223,453 1,306,854
Gross unrealized gains 2 5
Gross unrealized losses (201,722) (195,547)
Fair Value 1,021,733 1,111,312
Debt securities held to maturity    
Amortized Cost 437,272 444,102
Gross unrealized gains 0 0
Gross unrealized losses (74,597) (71,231)
Fair Value 362,675 372,871
Corporate debt securities    
Debt securities available for sale    
Amortized Cost 177,212 225,947
Gross unrealized gains 85 128
Gross unrealized losses (12,630) (16,171)
Fair Value $ 164,667 $ 209,904