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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 33,320  
Due after one year through five years 9,275  
Due after five years through ten years 132,017  
Due after ten years 89,258  
Total contractual maturities 263,870  
Available-for-sale investment securities, amortized cost 2,290,781 $ 2,558,675
Fair Value    
Due in one year or less 33,045  
Due after one year through five years 9,281  
Due after five years through ten years 132,281  
Due after ten years 89,450  
Total contractual maturities 264,057  
Total available-for-sale securities, Fair value, 2,055,959 2,255,336
Amortized Cost    
Due after five years through ten years 22,233  
Due after ten years 82,682  
Total contractual maturities 104,915  
Amortized cost 3,853,697 4,041,449
Fair Value    
Due after five years through ten years 21,019  
Due after ten years 76,725  
Total contractual maturities 97,744  
Total held to maturity, Fair value, 3,475,143 3,574,856
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,152,446  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,018,035  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,285,253  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,166,358  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 10,356  
Available-for-sale investment securities, amortized cost 10,356 11,303
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 9,367  
Total available-for-sale securities, Fair value, 9,367 10,182
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 41,584  
Amortized cost 41,584 43,885
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 36,932  
Total held to maturity, Fair value, 36,932 38,696
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 807,631  
Available-for-sale investment securities, amortized cost 807,631 895,421
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 723,591  
Total available-for-sale securities, Fair value, 723,591 783,297
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 94,039  
Amortized cost 94,039 99,379
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 84,270  
Total held to maturity, Fair value, 84,270 88,366
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 260,845  
Available-for-sale investment securities, amortized cost 260,845 268,944
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 216,010  
Total available-for-sale securities, Fair value, 216,010 218,674
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 30,960  
Amortized cost 30,960 30,795
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 23,956  
Total held to maturity, Fair value, 23,956 23,778
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 73,614  
Available-for-sale investment securities, amortized cost 73,614 93,459
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 69,067  
Total available-for-sale securities, Fair value, 69,067 86,431
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,118,670  
Amortized cost 1,118,670 1,129,738
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,021,200  
Total held to maturity, Fair value, 1,021,200 999,176
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 874,465  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 773,867  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,463,529  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,211,041  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 487,889  
Available-for-sale investment securities, amortized cost 487,889 538,718
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 434,141  
Total available-for-sale securities, Fair value, 434,141 471,150
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 928,546  
Amortized cost 928,546 989,130
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 833,690  
Total held to maturity, Fair value, 833,690 879,659
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 386,576  
Available-for-sale investment securities, amortized cost 386,576 425,826
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 339,726  
Total available-for-sale securities, Fair value, 339,726 363,970
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,534,983  
Amortized cost 1,534,983 1,642,274
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,377,351  
Total held to maturity, Fair value, $ 1,377,351 $ 1,448,377