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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Item
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Available-for-Sale securities, Fair Value $ 2,814,338 $ 2,797,174 $ 2,648,901
Pooled Trust Preferred Securities One [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost 16,807    
Available-for-Sale securities, Fair Value 8,097    
Available-for-Sale, Unrealized Gain/ (Loss) (8,710)    
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 $ 2,899    
Available-for-Sale securities, Fair Value 264    
Available-for-Sale, Unrealized Gain/ (Loss) (2,635)    
Realized Losses 2017 $ 0    
# of Issuers Currently Performing | Item 22    
# of Issuers Currently Remaining | Item 37    
Actual Deferrals and Defaults as a Percent of Original Collateral 32.10%    
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 2,395    
Available-for-Sale, Unrealized Gain/ (Loss) (2,027)    
Realized Losses 2017 $ 0    
# of Issuers Currently Performing | Item 35    
# 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 3.90%    
Excess Subordination as a % of Current Performing Collateral 46.50%    
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 $ 9,486    
Available-for-Sale securities, Fair Value 5,438    
Available-for-Sale, Unrealized Gain/ (Loss) (4,048)    
Realized Losses 2017 $ 0    
# of Issuers Currently Performing | Item 50    
# of Issuers Currently Remaining | Item 55    
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%    
Expected Defaults as a % of Remaining Performing Collateral 4.70%    
Excess Subordination as a % of Current Performing Collateral 45.40%    
Single Issuer Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost $ 9,797    
Available-for-Sale securities, Fair Value 9,861    
Available-for-Sale, Unrealized Gain/ (Loss) 64    
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 BB+    
Amortized Cost $ 3,401    
Available-for-Sale securities, Fair Value 3,308    
Available-for-Sale, Unrealized Gain/ (Loss) (93)    
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 $ 4,772    
Available-for-Sale securities, Fair Value 4,663    
Available-for-Sale, Unrealized Gain/ (Loss) (109)    
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 BB+    
Amortized Cost $ 794    
Available-for-Sale securities, Fair Value 946    
Available-for-Sale, Unrealized Gain/ (Loss) 152    
Realized Losses 2017 $ 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 $ 830    
Available-for-Sale securities, Fair Value 944    
Available-for-Sale, Unrealized Gain/ (Loss) 114    
Realized Losses 2017 0    
Trust Preferred Securities [Member]      
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]      
Amortized Cost 26,604    
Available-for-Sale securities, Fair Value 17,958    
Available-for-Sale, Unrealized Gain/ (Loss) (8,646)    
Realized Losses 2017 $ 0