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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year or less $ 55,021  
Due after one year through five years 80,163  
Due after five years through ten years 180,105  
Due after ten years 164,861  
Total contractual maturities 480,150  
Available-for-sale investment securities, amortized cost 3,549,599 $ 8,560,733
Fair Value    
Due in one year or less 54,644  
Due after one year through five years 76,492  
Due after five years through ten years 170,568  
Due after ten years 156,371  
Total contractual maturities 458,075  
Total available-for-sale securities, Fair value, 3,151,133 8,428,032
Amortized Cost    
Due after five years through ten years 10,208  
Due after ten years 97,932  
Total contractual maturities 108,140  
Amortized cost 4,320,639  
Fair Value    
Due after five years through ten years 8,932  
Due after ten years 85,766  
Total contractual maturities 94,698  
Total held to maturity, Fair value, 3,814,822 0
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,797,822  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,577,604  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,333,829  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,170,877  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 66,792  
Available-for-sale investment securities, amortized cost 66,792 135,764
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 59,723  
Total available-for-sale securities, Fair value, 59,723 137,264
Amortized Cost    
Amortized cost 46,302  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 46,302  
Total held to maturity, Fair value, 40,008  
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,317,718  
Available-for-sale investment securities, amortized cost 1,317,718 1,496,605
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,160,455  
Total available-for-sale securities, Fair value, 1,160,455 1,491,100
Amortized Cost    
Amortized cost 106,534  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 106,534  
Total held to maturity, Fair value, 93,556  
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 282,700  
Available-for-sale investment securities, amortized cost 282,700 392,443
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 237,853  
Total available-for-sale securities, Fair value, 237,853 387,663
Amortized Cost    
Amortized cost 30,544  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 30,544  
Total held to maturity, Fair value, 25,315  
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 130,612  
Available-for-sale investment securities, amortized cost 130,612 1,415,511
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 119,573  
Total available-for-sale securities, Fair value, 119,573 1,369,443
Amortized Cost    
Amortized cost 1,150,449  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,150,449  
Total held to maturity, Fair value, 1,011,998  
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,271,627  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,115,454  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,878,670  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,549,247  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 738,524  
Available-for-sale investment securities, amortized cost 738,524 2,103,187
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 653,322  
Total available-for-sale securities, Fair value, 653,322 2,079,523
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,080,492  
Amortized cost 1,080,492  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 958,114  
Total held to maturity, Fair value, 958,114  
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 533,103  
Available-for-sale investment securities, amortized cost 533,103 2,671,131
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 462,132  
Total available-for-sale securities, Fair value, 462,132 $ 2,621,044
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,798,178  
Amortized cost 1,798,178  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,591,133  
Total held to maturity, Fair value, $ 1,591,133