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Investment Securities Available for Sale - Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Amortized cost, within one year $ 545,074  
Amortized cost, 1 to 5 years 182,307  
Amortized cost, 5 to 10 years 452,953  
Amortized cost, more than 10 years 9,811,172  
Amortized Cost 10,991,506 $ 7,801,864
Fair Value    
Fair value, within one year 545,306  
Fair value, 1 to 5 years 184,013  
Fair value, 5 to 10 years 452,296  
Fair value, more than 10 years 9,736,714  
Total fair value 10,918,329 7,962,438
U.S. Treasury securities    
Amortized Cost    
Amortized cost, within one year 20,600  
Amortized cost, 1 to 5 years 0  
Amortized cost, 5 to 10 years 99,865  
Amortized cost, more than 10 years 0  
Amortized Cost 120,465 20,257
Fair Value    
Fair value, within one year 20,600  
Fair value, 1 to 5 years 0  
Fair value, 5 to 10 years 97,238  
Fair value, more than 10 years 0  
Total fair value 117,838 20,257
U.S. Government agency securities    
Amortized Cost    
Amortized cost, within one year 756  
Amortized cost, 1 to 5 years 321  
Amortized cost, 5 to 10 years 52,137  
Amortized cost, more than 10 years 0  
Amortized Cost 53,214 79,638
Fair Value    
Fair value, within one year 760  
Fair value, 1 to 5 years 322  
Fair value, 5 to 10 years 53,119  
Fair value, more than 10 years 0  
Total fair value 54,201 82,320
Mortgage-backed securities issued by U.S. Government agencies    
Amortized Cost    
Amortized cost, within one year 0  
Amortized cost, 1 to 5 years 842  
Amortized cost, 5 to 10 years 131  
Amortized cost, more than 10 years 789,356  
Amortized Cost 790,329 1,216,012
Fair Value    
Fair value, within one year 0  
Fair value, 1 to 5 years 870  
Fair value, 5 to 10 years 136  
Fair value, more than 10 years 778,627  
Total fair value 779,633 1,218,017
Mortgage-backed securities issued by U.S. Government sponsored enterprises    
Amortized Cost    
Amortized cost, within one year 28  
Amortized cost, 1 to 5 years 0  
Amortized cost, 5 to 10 years 80,539  
Amortized cost, more than 10 years 7,983,323  
Amortized Cost 8,063,890 4,865,858
Fair Value    
Fair value, within one year 28  
Fair value, 1 to 5 years 0  
Fair value, 5 to 10 years 83,271  
Fair value, more than 10 years 7,929,002  
Total fair value 8,012,301 5,000,046
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises    
Amortized Cost    
Amortized cost, within one year 0  
Amortized cost, 1 to 5 years 0  
Amortized cost, 5 to 10 years 146  
Amortized cost, more than 10 years 951,545  
Amortized Cost 951,691 1,245,644
Fair Value    
Fair value, within one year 0  
Fair value, 1 to 5 years 0  
Fair value, 5 to 10 years 150  
Fair value, more than 10 years 939,473  
Total fair value 939,623 1,250,377
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises    
Amortized Cost    
Amortized cost, within one year 0  
Amortized cost, 1 to 5 years 181,144  
Amortized cost, 5 to 10 years 211,328  
Amortized cost, more than 10 years 86,948  
Amortized Cost 479,420 354,244
Fair Value    
Fair value, within one year 0  
Fair value, 1 to 5 years 182,821  
Fair value, 5 to 10 years 209,311  
Fair value, more than 10 years 89,612  
Total fair value 481,744 370,921
Asset-backed securities    
Amortized Cost    
Amortized cost, within one year 514,188  
Amortized cost, 1 to 5 years 0  
Amortized cost, 5 to 10 years 0  
Amortized cost, more than 10 years 0  
Amortized Cost 514,188  
Fair Value    
Fair value, within one year 514,188  
Fair value, 1 to 5 years 0  
Fair value, 5 to 10 years 0  
Fair value, more than 10 years 0  
Total fair value 514,188  
Corporate debt securities and other debt securities    
Amortized Cost    
Amortized cost, within one year 9,502  
Amortized cost, 1 to 5 years 0  
Amortized cost, 5 to 10 years 8,807  
Amortized cost, more than 10 years 0  
Amortized Cost 18,309 20,211
Fair Value    
Fair value, within one year 9,730  
Fair value, 1 to 5 years 0  
Fair value, 5 to 10 years 9,071  
Fair value, more than 10 years 0  
Total fair value $ 18,801 $ 20,500