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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 1,800 $ 1,390
Due after one through five years 12,189 24,899
Due after five through ten years 168,338 127,948
Due after ten years 922,636 1,151,260
Total debt securities with a single maturity date 1,104,963 1,305,497
Amortized Cost 1,624,906 1,846,840
Fair Value    
Due in one year or less 1,795 1,382
Due after one through five years 11,857 23,372
Due after five through ten years 151,467 120,385
Due after ten years 789,734 1,027,158
Total debt securities with a single maturity date 954,853 1,172,297
Total Investment Securities 1,386,475 1,627,112
Amortized Cost    
Due in one year or less 5,268 3,041
Due after one through five years 124,004 118,592
Due after five through ten years 174,533 135,805
Due after ten years 1,129,147 1,217,265
Total debt securities with a single maturity date 1,432,952 1,474,703
Amortized Cost 2,074,465 2,184,497
Fair Value    
Due in one year or less 5,254 3,043
Due after one through five years 117,999 111,723
Due after five through ten years 154,533 126,461
Due after ten years 906,564 1,018,801
Total debt securities with a single maturity date 1,184,350 1,260,028
Total Investment Securities 1,723,520 1,870,374
U.S. Government-sponsored mortgage-backed securities    
Amortized Cost    
U.S. Government-sponsored mortgage-backed securities 519,943 541,343
Amortized Cost 519,943 541,343
Fair Value    
Without single maturity date 431,622 454,815
Total Investment Securities 431,622 454,815
Amortized Cost    
Without single maturity date 641,513 709,794
Amortized Cost 641,513 709,794
Fair Value    
Without single maturity date 539,170 610,346
Total Investment Securities $ 539,170 $ 610,346