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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Item
Dec. 31, 2016
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-Sale securities, Fair Value $ 3,196,207 $ 2,797,174
Pooled Trust Preferred Securities One [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Amortized Cost 16,605  
Available-for-Sale securities, Fair Value 8,448  
Available-for-Sale, Unrealized Gain/ (Loss) (8,157)  
Realized Losses 2017 $ 0  
Pooled Trust Preferred Securities One [Member] | Reg Div Funding 2004 [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Pooled trust preferred securities, Class B-2  
Lowest Credit Rating D  
Amortized Cost $ 2,696  
Available-for-Sale securities, Fair Value 273  
Available-for-Sale, Unrealized Gain/ (Loss) (2,423)  
Realized Losses 2017 $ 0  
# of Issuers Currently Performing | Item 21  
# of Issuers Currently Remaining | Item 36  
Actual Deferrals and Defaults as a Percent of Original Collateral 32.10%  
Expected Defaults as a % of Remaining Performing Collateral 7.70%  
Excess Subordination as a % of Current Performing Collateral 0.00%  
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  
Amortized Cost $ 4,414  
Available-for-Sale securities, Fair Value 2,478  
Available-for-Sale, Unrealized Gain/ (Loss) (1,936)  
Realized Losses 2017 $ 0  
# of Issuers Currently Performing | Item 34  
# of Issuers Currently Remaining | Item 44  
Actual Deferrals and Defaults as a Percent of Original Collateral 16.70%  
Expected Defaults as a % of Remaining Performing Collateral 11.80%  
Excess Subordination as a % of Current Performing Collateral 33.10%  
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  
Amortized Cost $ 9,495  
Available-for-Sale securities, Fair Value 5,697  
Available-for-Sale, Unrealized Gain/ (Loss) (3,798)  
Realized Losses 2017 $ 0  
# of Issuers Currently Performing | Item 49  
# of Issuers Currently Remaining | Item 54  
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%  
Expected Defaults as a % of Remaining Performing Collateral 8.30%  
Excess Subordination as a % of Current Performing Collateral 53.70%  
Single Issuer Trust Preferred Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Amortized Cost $ 8,987  
Available-for-Sale securities, Fair Value 9,003  
Available-for-Sale, Unrealized Gain/ (Loss) 16  
Realized Losses 2017 $ 0  
Single Issuer Trust Preferred Securities [Member] | Fleet Cap Tr V (BOA) [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Lowest Credit Rating BBB-  
Amortized Cost $ 3,406  
Available-for-Sale securities, Fair Value 3,290  
Available-for-Sale, Unrealized Gain/ (Loss) (116)  
Realized Losses 2017 $ 0  
Single Issuer Trust Preferred Securities [Member] | J P Morgan Chase Cap XIII [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Lowest Credit Rating BBB-  
Amortized Cost $ 4,778  
Available-for-Sale securities, Fair Value 4,778  
Realized Losses 2017 $ 0  
Single Issuer Trust Preferred Securities [Member] | NB-Global [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Lowest Credit Rating BBB-  
Amortized Cost $ 803  
Available-for-Sale securities, Fair Value 935  
Available-for-Sale, Unrealized Gain/ (Loss) 132  
Realized Losses 2017 0  
Trust Preferred Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Amortized Cost 25,592  
Available-for-Sale securities, Fair Value 17,451  
Available-for-Sale, Unrealized Gain/ (Loss) (8,141)  
Realized Losses 2017 $ 0