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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Item
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale securities, Fair Value $ 2,648,901 $ 2,418,221 $ 2,572,521
Pooled Trust Preferred Securities One [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost 17,059    
Available-for-Sale securities, Fair Value 6,720    
Available-for-Sale, Unrealized Gain/ (Loss) (10,339)    
Realized Losses 2016 $ 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 $ 3,168    
Available-for-Sale securities, Fair Value 204    
Available-for-Sale, Unrealized Gain/ (Loss) (2,964)    
Realized Losses 2016 $ 0    
# of Issuers Currently Performing | Item 23    
# of Issuers Currently Remaining | Item 39    
Actual Deferrals and Defaults as a Percent of Original Collateral 33.30%    
Expected Defaults as a % of Remaining Performing Collateral 7.40%    
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 $ 4,422    
Available-for-Sale securities, Fair Value 2,017    
Available-for-Sale, Unrealized Gain/ (Loss) (2,405)    
Realized Losses 2016 $ 0    
# of Issuers Currently Performing | Item 33    
# of Issuers Currently Remaining | Item 43    
Actual Deferrals and Defaults as a Percent of Original Collateral 18.90%    
Expected Defaults as a % of Remaining Performing Collateral 4.20%    
Excess Subordination as a % of Current Performing Collateral 49.40%    
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 $ 9,469    
Available-for-Sale securities, Fair Value 4,499    
Available-for-Sale, Unrealized Gain/ (Loss) (4,970)    
Realized Losses 2016 $ 0    
# of Issuers Currently Performing | Item 50    
# of Issuers Currently Remaining | Item 57    
Actual Deferrals and Defaults as a Percent of Original Collateral 8.90%    
Expected Defaults as a % of Remaining Performing Collateral 4.90%    
Excess Subordination as a % of Current Performing Collateral 43.10%    
Single Issuer Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost $ 9,747    
Available-for-Sale securities, Fair Value 8,485    
Available-for-Sale, Unrealized Gain/ (Loss) (1,262)    
Realized Losses 2016 $ 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 BB+    
Amortized Cost $ 3,393    
Available-for-Sale securities, Fair Value 2,835    
Available-for-Sale, Unrealized Gain/ (Loss) (558)    
Realized Losses 2016 $ 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 $ 4,762    
Available-for-Sale securities, Fair Value 4,000    
Available-for-Sale, Unrealized Gain/ (Loss) (762)    
Realized Losses 2016 $ 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 BB+    
Amortized Cost $ 777    
Available-for-Sale securities, Fair Value 810    
Available-for-Sale, Unrealized Gain/ (Loss) 33    
Realized Losses 2016 $ 0    
Single Issuer Trust Preferred Securities [Member] | Chase Cap II [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Lowest Credit Rating BBB-    
Amortized Cost $ 815    
Available-for-Sale securities, Fair Value 840    
Available-for-Sale, Unrealized Gain/ (Loss) 25    
Realized Losses 2016 0    
Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost 26,806    
Available-for-Sale securities, Fair Value 15,205    
Available-for-Sale, Unrealized Gain/ (Loss) (11,601)    
Realized Losses 2016 $ 0