v3.26.1
INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Held-to-Maturity, Amortized Cost    
Due in one year or less $ 0  
Due after one through five years 408,697  
Due after five years through ten years 176,879  
Due after ten years 597,736  
Subtotal 1,183,312  
Total - Amortized Cost 1,478,386 $ 1,454,166
Held-to-Maturity, Fair Value    
Due in one year or less 0  
Due after one through five years 392,465  
Due after five years through ten years 169,518  
Due after ten years 513,791  
Subtotal 1,075,774  
Fair Value 1,372,481 1,370,464
Available-for-Sale, Amortized Cost    
Due in one year or less 502,545  
Due after one through five years 1,479,371  
Due after five years through ten years 467,320  
Due after ten years 449,227  
Subtotal 2,898,463  
Amortized Cost 3,237,809 3,148,728
Available-for-Sale, Fair Value    
Due in one year or less 495,584  
Due after one through five years 1,400,752  
Due after five years through ten years 409,077  
Due after ten years 358,432  
Subtotal 2,663,845  
Fair Value 2,957,963 2,875,341
Government agency mortgage-backed securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 295,074 285,679
Held-to-Maturity, Fair Value    
Fair Value 296,707 288,980
Available-for-Sale, Amortized Cost    
Amortized Cost 329,485 322,253
Available-for-Sale, Fair Value    
Fair Value 284,451 278,885
Government agency collateralized mortgage obligations    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 0  
Held-to-Maturity, Fair Value    
Fair Value 0  
Available-for-Sale, Amortized Cost    
Amortized Cost 9,861 4,583
Available-for-Sale, Fair Value    
Fair Value $ 9,667 $ 4,401