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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 44,758  
Due after one year through five years 60,529  
Due after five years through ten years 177,638  
Due after ten years 164,864  
Total contractual maturities 447,789  
Available-for-sale investment securities, amortized cost 3,427,708 $ 3,549,599
Fair Value    
Due in one year or less 44,068  
Due after one year through five years 57,863  
Due after five years through ten years 165,278  
Due after ten years 155,888  
Total contractual maturities 423,097  
Total available-for-sale securities, Fair value, 3,054,280 3,151,133
Amortized Cost    
Due after five years through ten years 10,232  
Due after ten years 98,071  
Total contractual maturities 108,303  
Amortized cost 4,261,361 4,320,639
Fair Value    
Due after five years through ten years 9,141  
Due after ten years 87,628  
Total contractual maturities 96,769  
Total held to maturity, Fair value, 3,824,478 3,814,822
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,748,457  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,543,389  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,328,343  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,188,580  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 65,261  
Available-for-sale investment securities, amortized cost 65,261 66,792
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 59,297  
Total available-for-sale securities, Fair value, 59,297 59,723
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 45,860  
Amortized cost 45,860 46,302
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 40,144  
Total held to maturity, Fair value, 40,144 40,008
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,276,130  
Available-for-sale investment securities, amortized cost 1,276,130 1,317,718
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,132,254  
Total available-for-sale securities, Fair value, 1,132,254 1,160,455
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 104,868  
Amortized cost 104,868 106,534
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 93,261  
Total held to maturity, Fair value, 93,261 93,556
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 281,009  
Available-for-sale investment securities, amortized cost 281,009 282,700
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 235,071  
Total available-for-sale securities, Fair value, 235,071 237,853
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 30,606  
Amortized cost 30,606 30,544
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 25,062  
Total held to maturity, Fair value, 25,062 25,315
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 126,057  
Available-for-sale investment securities, amortized cost 126,057 130,612
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 116,767  
Total available-for-sale securities, Fair value, 116,767 119,573
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,147,009  
Amortized cost 1,147,009 1,150,449
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,030,113  
Total held to maturity, Fair value, 1,030,113 1,011,998
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,231,462  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,087,794  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,824,715  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,539,129  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 715,004  
Available-for-sale investment securities, amortized cost 715,004 738,524
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 636,602  
Total available-for-sale securities, Fair value, 636,602 653,322
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,060,910  
Amortized cost 1,060,910 1,080,492
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 956,337  
Total held to maturity, Fair value, 956,337 958,114
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 516,458  
Available-for-sale investment securities, amortized cost 516,458 533,103
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 451,192  
Total available-for-sale securities, Fair value, 451,192 462,132
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,763,805  
Amortized cost 1,763,805 1,798,178
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,582,792  
Total held to maturity, Fair value, $ 1,582,792 $ 1,591,133