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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Item
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost $ 4,556,605 $ 4,172,617  
Available-for-Sale securities, Fair Value 4,569,772 $ 4,123,416 $ 3,219,863
Pooled Trust Preferred Securities One [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 13,850    
Available-for-Sale securities, Fair Value 8,123    
Available-for-Sale, Unrealized Gain/ (Loss) $ (5,727)    
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 $ 4,334    
Available-for-Sale securities, Fair Value 2,298    
Available-for-Sale, Unrealized Gain/ (Loss) $ (2,036)    
# of Issuers Currently Performing | Item 33    
# of Issuers Currently Remaining | Item 43    
Actual Deferrals and Defaults as a Percent of Original Collateral 17.20%    
Expected Defaults as a % of Remaining Performing Collateral 4.50%    
Excess Subordination as a % of Current Performing Collateral 36.20%    
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 $ 9,516    
Available-for-Sale securities, Fair Value 5,825    
Available-for-Sale, Unrealized Gain/ (Loss) $ (3,691)    
# of Issuers Currently Performing | Item 44    
# of Issuers Currently Remaining | Item 49    
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%    
Expected Defaults as a % of Remaining Performing Collateral 4.50%    
Excess Subordination as a % of Current Performing Collateral 55.70%    
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 $ 4,790    
Available-for-Sale securities, Fair Value 4,375    
Available-for-Sale, Unrealized Gain/ (Loss) (415)    
Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 18,640    
Available-for-Sale securities, Fair Value 12,498    
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,142)