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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Item
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost $ 4,834,585 $ 4,172,617  
Available-for-Sale securities, Fair Value 4,916,979 $ 4,123,416 $ 3,272,456
Pooled Trust Preferred Securities One [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 13,825    
Available-for-Sale securities, Fair Value 7,695    
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,130)    
Pooled Trust Preferred Securities One [Member] | Pretsl XXVII LTD [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Pooled trust preferred securities, Class B    
Lowest Credit Rating B    
Available-for-Sale, Amortized Cost $ 4,303    
Available-for-Sale securities, Fair Value 2,135    
Available-for-Sale, Unrealized Gain/ (Loss) $ (2,168)    
# of Issuers Currently Performing | Item 32    
# of Issuers Currently Remaining | Item 41    
Actual Deferrals and Defaults as a Percent of Original Collateral 14.60%    
Expected Defaults as a % of Remaining Performing Collateral 11.30%    
Excess Subordination as a % of Current Performing Collateral 26.70%    
Pooled Trust Preferred Securities One [Member] | Trapeza Ser 13A [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Pooled trust preferred securities, Class A2A    
Lowest Credit Rating BBB    
Available-for-Sale, Amortized Cost $ 9,522    
Available-for-Sale securities, Fair Value 5,560    
Available-for-Sale, Unrealized Gain/ (Loss) $ (3,962)    
# of Issuers Currently Performing | Item 42    
# of Issuers Currently Remaining | Item 47    
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%    
Expected Defaults as a % of Remaining Performing Collateral 6.70%    
Excess Subordination as a % of Current Performing Collateral 49.60%    
Single Issuer Trust Preferred Securities [Member] | JP Morgan Chase & Co [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Lowest Credit Rating BBB-    
Available-for-Sale, Amortized Cost $ 4,795    
Available-for-Sale securities, Fair Value 4,325    
Available-for-Sale, Unrealized Gain/ (Loss) (470)    
Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 18,620    
Available-for-Sale securities, Fair Value 12,020    
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,600)