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Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring and Nonrecurring Basis) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financial assets held at fair value:    
Debt Securities, Available-for-sale $ 2,978,657 $ 2,898,730
Derivative Asset 2,706 2,497
Loans Held-for-sale, Fair Value Disclosure 19,249 7,908
Financial liabilities held at fair value:    
Derivative liability 2,944 71
US Treasury Bill Securities [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 9,998 7,550
Agency CMO [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 214,252 234,923
Agency MBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 1,619,472 1,481,089
Agency CMBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 578,701 566,237
Non-agency CMBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 429,068 445,581
CLO [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 96,389 112,771
Corporate debt securities [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 30,777 50,579
Fair Value, Recurring [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 2,978,657 2,898,730
Alternative Investment 2,990 2,563
Total financial assets held at fair value 3,147,978 2,959,786
Financial liabilities held at fair value:    
Derivative liability [1] 14,045 39,010
Fair Value, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 9,998 7,550
Alternative Investment 0 0
Total financial assets held at fair value 15,151 12,615
Financial liabilities held at fair value:    
Derivative liability [1] 620 588
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 2,968,659 2,891,180
Alternative Investment 0 0
Total financial assets held at fair value 3,129,837 2,944,608
Financial liabilities held at fair value:    
Derivative liability [1] 13,425 38,422
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Alternative Investment 2,990 2,563
Total financial assets held at fair value 2,990 2,563
Financial liabilities held at fair value:    
Derivative liability   0
Fair Value, Recurring [Member] | Derivative instruments [Member]    
Financial assets held at fair value:    
Derivative Asset [1] 142,433 46,278
Fair Value, Recurring [Member] | Derivative instruments [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Derivative Asset [1] 504 758
Fair Value, Recurring [Member] | Derivative instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Derivative Asset [1] 141,929 45,520
Fair Value, Recurring [Member] | Derivative instruments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Derivative Asset   0
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member]    
Financial assets held at fair value:    
Other assets 4,649 4,307
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Other assets 4,649 4,307
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Other assets   0
Fair Value, Recurring [Member] | Loan Origination Commitments [Member]    
Financial assets held at fair value:    
Loans Held-for-sale, Fair Value Disclosure 19,249 7,908
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Loans Held-for-sale, Fair Value Disclosure 0 0
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Loans Held-for-sale, Fair Value Disclosure 19,249 7,908
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Loans Held-for-sale, Fair Value Disclosure 0  
Fair Value, Recurring [Member] | US Treasury Bill Securities [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 9,998 7,550
Fair Value, Recurring [Member] | US Treasury Bill Securities [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 9,998 7,550
Fair Value, Recurring [Member] | Agency CMO [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 214,252 234,923
Fair Value, Recurring [Member] | Agency CMO [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 214,252 234,923
Fair Value, Recurring [Member] | Agency MBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 1,619,472 1,481,089
Fair Value, Recurring [Member] | Agency MBS [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 1,619,472 1,481,089
Fair Value, Recurring [Member] | Agency CMBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 578,701 566,237
Fair Value, Recurring [Member] | Agency CMBS [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 578,701 566,237
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | Agency CMBS [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | Non-agency CMBS [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 429,068 445,581
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 429,068 445,581
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 0 0
Fair Value, Recurring [Member] | CLO [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 96,389 112,771
Fair Value, Recurring [Member] | CLO [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 96,389 112,771
Fair Value, Recurring [Member] | Corporate debt securities [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale 30,777 50,579
Fair Value, Recurring [Member] | Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets held at fair value:    
Debt Securities, Available-for-sale $ 30,777 $ 50,579
[1] or information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparties see Note 13: Derivative Financial Instruments.