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Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring and Nonrecurring Basis) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Financial Assets:    
Total available-for-sale investment securities $ 8,085,044 $ 4,234,854
Asset derivatives 16,648 133,481
Value under fair value options 898 4,694
Financial Liabilities:    
Liability derivatives 409,900 13,301
U.S. Treasury notes    
Financial Assets:    
Total available-for-sale investment securities 713,263 396,966
Government agency debentures    
Financial Assets:    
Total available-for-sale investment securities 269,028  
Municipal bonds and notes    
Financial Assets:    
Total available-for-sale investment securities 1,697,145  
Agency CMO    
Financial Assets:    
Total available-for-sale investment securities 63,861 90,384
Agency MBS    
Financial Assets:    
Total available-for-sale investment securities 2,197,349 1,593,403
Agency CMBS    
Financial Assets:    
Total available-for-sale investment securities 1,455,919 1,232,541
Non-agency CMBS    
Financial Assets:    
Total available-for-sale investment securities 922,928 886,263
CLO    
Financial Assets:    
Total available-for-sale investment securities 7,203 21,847
Corporate debt securities    
Financial Assets:    
Total available-for-sale investment securities 702,172 13,450
Private label MBS    
Financial Assets:    
Total available-for-sale investment securities 44,310  
Other    
Financial Assets:    
Total available-for-sale investment securities 11,866  
Fair Value, Recurring    
Financial Assets:    
Total available-for-sale investment securities 8,085,044 4,234,854
Alternative investments 75,728 27,732
Total financial assets 8,393,413 4,429,813
Financial Liabilities:    
Liability derivatives 426,777 21,784
Fair Value, Recurring | Level 1    
Financial Assets:    
Total available-for-sale investment securities 713,263 396,966
Alternative investments 522 1,877
Total financial assets 727,626 402,446
Financial Liabilities:    
Liability derivatives 296 141
Fair Value, Recurring | Level 2    
Financial Assets:    
Total available-for-sale investment securities 7,371,781 3,837,888
Alternative investments 0 0
Total financial assets 7,590,581 4,001,512
Financial Liabilities:    
Liability derivatives 426,481 21,643
Fair Value, Recurring | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Alternative investments 0 0
Total financial assets 0 0
Financial Liabilities:    
Liability derivatives 0 0
Fair Value, Recurring | Derivative instruments    
Financial Assets:    
Asset derivatives 219,493 159,117
Fair Value, Recurring | Derivative instruments | Level 1    
Financial Assets:    
Asset derivatives 1,591 187
Fair Value, Recurring | Derivative instruments | Level 2    
Financial Assets:    
Asset derivatives 217,902 158,930
Fair Value, Recurring | Derivative instruments | Level 3    
Financial Assets:    
Asset derivatives 0 0
Fair Value, Recurring | Loan Origination Commitments    
Financial Assets:    
Value under fair value options 898 4,694
Fair Value, Recurring | Loan Origination Commitments | Level 1    
Financial Assets:    
Value under fair value options 0 0
Fair Value, Recurring | Loan Origination Commitments | Level 2    
Financial Assets:    
Value under fair value options 898 4,694
Fair Value, Recurring | Loan Origination Commitments | Level 3    
Financial Assets:    
Value under fair value options 0 0
Fair Value, Recurring | Investments Held In Rabbi Trust    
Financial Assets:    
Other assets 12,250 3,416
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 1    
Financial Assets:    
Other assets 12,250 3,416
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 2    
Financial Assets:    
Other assets 0 0
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 3    
Financial Assets:    
Other assets 0 0
Fair Value, Recurring | U.S. Treasury notes    
Financial Assets:    
Total available-for-sale investment securities 713,263 396,966
Fair Value, Recurring | U.S. Treasury notes | Level 1    
Financial Assets:    
Total available-for-sale investment securities 713,263 396,966
Fair Value, Recurring | U.S. Treasury notes | Level 2    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | U.S. Treasury notes | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Government agency debentures    
Financial Assets:    
Total available-for-sale investment securities 269,028  
Fair Value, Recurring | Government agency debentures | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Government agency debentures | Level 2    
Financial Assets:    
Total available-for-sale investment securities 269,028  
Fair Value, Recurring | Government agency debentures | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Municipal bonds and notes    
Financial Assets:    
Total available-for-sale investment securities 1,697,145  
Fair Value, Recurring | Municipal bonds and notes | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Municipal bonds and notes | Level 2    
Financial Assets:    
Total available-for-sale investment securities 1,697,145  
Fair Value, Recurring | Municipal bonds and notes | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Agency CMO    
Financial Assets:    
Total available-for-sale investment securities 63,861 90,384
Fair Value, Recurring | Agency CMO | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Agency CMO | Level 2    
Financial Assets:    
Total available-for-sale investment securities 63,861 90,384
Fair Value, Recurring | Agency CMO | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Agency MBS    
Financial Assets:    
Total available-for-sale investment securities 2,197,349 1,593,403
Fair Value, Recurring | Agency MBS | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Agency MBS | Level 2    
Financial Assets:    
Total available-for-sale investment securities 2,197,349 1,593,403
Fair Value, Recurring | Agency MBS | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Agency CMBS    
Financial Assets:    
Total available-for-sale investment securities 1,455,919 1,232,541
Fair Value, Recurring | Agency CMBS | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Agency CMBS | Level 2    
Financial Assets:    
Total available-for-sale investment securities 1,455,919 1,232,541
Fair Value, Recurring | Agency CMBS | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Non-agency CMBS    
Financial Assets:    
Total available-for-sale investment securities 922,928 886,263
Fair Value, Recurring | Non-agency CMBS | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Non-agency CMBS | Level 2    
Financial Assets:    
Total available-for-sale investment securities 922,928 886,263
Fair Value, Recurring | Non-agency CMBS | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | CLO    
Financial Assets:    
Total available-for-sale investment securities 7,203 21,847
Fair Value, Recurring | CLO | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | CLO | Level 2    
Financial Assets:    
Total available-for-sale investment securities 7,203 21,847
Fair Value, Recurring | CLO | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Corporate debt securities    
Financial Assets:    
Total available-for-sale investment securities 702,172 13,450
Fair Value, Recurring | Corporate debt securities | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0 0
Fair Value, Recurring | Corporate debt securities | Level 2    
Financial Assets:    
Total available-for-sale investment securities 702,172 13,450
Fair Value, Recurring | Corporate debt securities | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0 $ 0
Fair Value, Recurring | Private label MBS    
Financial Assets:    
Total available-for-sale investment securities 44,310  
Fair Value, Recurring | Private label MBS | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Private label MBS | Level 2    
Financial Assets:    
Total available-for-sale investment securities 44,310  
Fair Value, Recurring | Private label MBS | Level 3    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Other    
Financial Assets:    
Total available-for-sale investment securities 11,866  
Fair Value, Recurring | Other | Level 1    
Financial Assets:    
Total available-for-sale investment securities 0  
Fair Value, Recurring | Other | Level 2    
Financial Assets:    
Total available-for-sale investment securities 11,866  
Fair Value, Recurring | Other | Level 3    
Financial Assets:    
Total available-for-sale investment securities $ 0