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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Item
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost $ 4,603,975 $ 4,172,617  
Available-for-Sale securities, Fair Value 4,667,226 $ 4,123,416 $ 3,181,665
Pooled Trust Preferred Securities One [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 13,836    
Available-for-Sale securities, Fair Value 7,836    
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,000)    
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 $ 4,317    
Available-for-Sale securities, Fair Value 2,131    
Available-for-Sale, Unrealized Gain/ (Loss) $ (2,186)    
# 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 36.00%    
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 $ 9,519    
Available-for-Sale securities, Fair Value 5,705    
Available-for-Sale, Unrealized Gain/ (Loss) $ (3,814)    
# of Issuers Currently Performing | Item 43    
# of Issuers Currently Remaining | Item 48    
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 56.70%    
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 $ 4,792    
Available-for-Sale securities, Fair Value 4,225    
Available-for-Sale, Unrealized Gain/ (Loss) (567)    
Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale, Amortized Cost 18,628    
Available-for-Sale securities, Fair Value 12,061    
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,567)