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Investment Securities (Summary Of Debt Securities Held-to Maturity) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Held-to-maturity, Amortized Cost - Due in one year or less $ 1,085  
Held-to-maturity, Amortized Cost - Due after one year through five years 5,833  
Held-to-maturity, Amortized Cost - Due after five through ten years 264,751  
Held-to-maturity, Amortized Cost - Due after ten years 5,205,457  
Amortized Cost(1) 5,477,126 $ 5,293,918
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held to maturity, Fair Value - Due in one year or less 1,089  
Held-to-maturity, Fair Value - Due after one year through five years 6,130  
Held to maturity, Fair Value - Due after five through ten years 277,660  
Held to maturity, Fair Value - Due after ten years 5,460,680  
Fair Value(2) 5,745,559 5,380,653
Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 443,493  
Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 4,656,689  
Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 201,773  
Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 117,544  
Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 42,227  
Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 8,667  
Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 2,066  
Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 285  
Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 4,382  
Agency CMO [Member]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 138,529 167,443
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value(2) 141,775 167,366
Agency CMO [Member] | Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 138,529  
Agency CMO [Member] | Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMO [Member] | Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 2,766,764 2,957,900
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value(2) 2,914,694 3,009,769
Agency MBS [Member] | Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 2,766,764  
Agency MBS [Member] | Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency MBS [Member] | Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 1,585,929 1,172,491
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value(2) 1,646,472 1,173,320
Agency CMBS [Member] | Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 1,585,929  
Agency CMBS [Member] | Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Agency CMBS [Member] | Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Municipal bonds and notes [Member]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 752,537 740,431
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value(2) 801,835 773,119
Municipal bonds and notes [Member] | Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 210,126  
Municipal bonds and notes [Member] | Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 165,467  
Municipal bonds and notes [Member] | Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 201,773  
Municipal bonds and notes [Member] | Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 117,544  
Municipal bonds and notes [Member] | Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 42,227  
Municipal bonds and notes [Member] | Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 8,667  
Municipal bonds and notes [Member] | Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 2,066  
Municipal bonds and notes [Member] | Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 285  
Municipal bonds and notes [Member] | Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 4,382  
Non-agency CMBS [Member]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 233,367 255,653
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Fair Value(2) 240,783 $ 257,079
Non-agency CMBS [Member] | Moody's, Aaa Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 233,367  
Non-agency CMBS [Member] | Moody's, Aa1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, Aa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, Aa3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, A1 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, A2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, A3 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, Baa2 Rating    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) 0  
Non-agency CMBS [Member] | Moody's, Not Rated    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Amortized Cost(1) $ 0