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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
issuer
portfolio
Dec. 31, 2019
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total $ 5,189,363 $ 5,313,209
Fair Value 5,360,025 $ 5,385,091
Pooled Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 13,798  
Fair Value 7,422  
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,376)  
Pooled Trust Preferred Securities | Pretsl XXVII LTD    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Pooled trust preferred securities, Class B  
Lowest Credit Rating B  
Total $ 4,270  
Fair Value 2,192  
Available-for-Sale, Unrealized Gain/ (Loss) $ (2,078)  
Number of Issuers Currently Performing | issuer 32  
Number of Issuers Currently Remaining | portfolio 41  
Actual Deferrals and Defaults as a Percent of Original Collateral 14.40%  
Expected Defaults as a % of Remaining Performing Collateral 11.20%  
Excess Subordination as a % of Current Performing Collateral 33.50%  
Pooled Trust Preferred Securities | Trapeza Ser 13A    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Pooled trust preferred securities, Class A2A  
Lowest Credit Rating BBB  
Total $ 9,528  
Fair Value 5,230  
Available-for-Sale, Unrealized Gain/ (Loss) $ (4,298)  
Number of Issuers Currently Performing | issuer 39  
Number of Issuers Currently Remaining | portfolio 41  
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%  
Expected Defaults as a % of Remaining Performing Collateral 6.60%  
Excess Subordination as a % of Current Performing Collateral 51.60%  
Single Issuer Trust Preferred Securities | JP Morgan Chase & Co    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Lowest Credit Rating BBB-  
Total $ 4,800  
Fair Value 3,600  
Available-for-Sale, Unrealized Gain/ (Loss) (1,200)  
Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 18,598  
Fair Value 11,022  
Available-for-Sale, Unrealized Gain/ (Loss) $ (7,576)