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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 44,820  
Due after one year through five years 60,590  
Due after five years through ten years 175,172  
Due after ten years 164,865  
Total contractual maturities 445,447  
Available-for-sale investment securities, amortized cost 3,296,825 $ 3,549,599
Fair Value    
Due in one year or less 44,242  
Due after one year through five years 57,478  
Due after five years through ten years 162,622  
Due after ten years 158,776  
Total contractual maturities 423,118  
Total available-for-sale securities, Fair value, 2,909,372 3,151,133
Amortized Cost    
Due after five years through ten years 10,255  
Due after ten years 96,941  
Total contractual maturities 107,196  
Amortized cost 4,180,408 4,320,639
Fair Value    
Due after five years through ten years 9,264  
Due after ten years 86,271  
Total contractual maturities 95,535  
Total held to maturity, Fair value, 3,697,261 3,814,822
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,665,667  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,453,553  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,315,869  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,162,339  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 63,486  
Available-for-sale investment securities, amortized cost 63,486 66,792
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 57,202  
Total available-for-sale securities, Fair value, 57,202 59,723
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 45,097  
Amortized cost 45,097 46,302
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 39,613  
Total held to maturity, Fair value, 39,613 40,008
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,229,375  
Available-for-sale investment securities, amortized cost 1,229,375 1,317,718
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,082,992  
Total available-for-sale securities, Fair value, 1,082,992 1,160,455
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 102,940  
Amortized cost 102,940 106,534
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 91,042  
Total held to maturity, Fair value, 91,042 93,556
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 276,365  
Available-for-sale investment securities, amortized cost 276,365 282,700
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 225,462  
Total available-for-sale securities, Fair value, 225,462 237,853
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 30,675  
Amortized cost 30,675 30,544
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 24,294  
Total held to maturity, Fair value, 24,294 25,315
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 96,441  
Available-for-sale investment securities, amortized cost 96,441 130,612
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 87,897  
Total available-for-sale securities, Fair value, 87,897 119,573
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,137,157  
Amortized cost 1,137,157 1,150,449
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,007,390  
Total held to maturity, Fair value, 1,007,390 1,011,998
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,185,711  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,032,701  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,757,343  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,439,387  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 688,844  
Available-for-sale investment securities, amortized cost 688,844 738,524
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 605,221  
Total available-for-sale securities, Fair value, 605,221 653,322
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,036,671  
Amortized cost 1,036,671 1,080,492
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 917,165  
Total held to maturity, Fair value, 917,165 958,114
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 496,867  
Available-for-sale investment securities, amortized cost 496,867 533,103
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 427,480  
Total available-for-sale securities, Fair value, 427,480 462,132
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,720,672  
Amortized cost 1,720,672 1,798,178
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,522,222  
Total held to maturity, Fair value, $ 1,522,222 $ 1,591,133