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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
issuer
Dec. 31, 2019
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total $ 5,413,977 $ 5,313,209
Fair Value 5,601,534 $ 5,385,091
Pooled Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 13,773  
Fair Value 7,527  
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,246)  
Pooled Trust Preferred Securities | Pretsl XXVII LTD    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Pooled trust preferred securities, Class B  
Lowest Credit Rating B  
Total $ 4,238  
Fair Value 2,228  
Available-for-Sale, Unrealized Gain/ (Loss) $ (2,010)  
Number of Issuers Currently Performing | issuer 32  
Number of Issuers Currently Remaining | issuer 41  
Actual Deferrals and Defaults as a Percent of Original Collateral 14.40%  
Expected Defaults as a % of Remaining Performing Collateral 10.80%  
Excess Subordination as a % of Current Performing Collateral 33.40%  
Pooled Trust Preferred Securities | Trapeza Ser 13A    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Pooled trust preferred securities, Class A2A  
Lowest Credit Rating BBB  
Total $ 9,535  
Fair Value 5,299  
Available-for-Sale, Unrealized Gain/ (Loss) $ (4,236)  
Number of Issuers Currently Performing | issuer 39  
Number of Issuers Currently Remaining | issuer 41  
Actual Deferrals and Defaults as a Percent of Original Collateral 4.50%  
Expected Defaults as a % of Remaining Performing Collateral 6.40%  
Excess Subordination as a % of Current Performing Collateral 52.10%  
Single Issuer Trust Preferred Securities | JP Morgan Chase & Co    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Lowest Credit Rating BBB-  
Total $ 4,806  
Fair Value 4,412  
Available-for-Sale, Unrealized Gain/ (Loss) (394)  
Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 18,579  
Fair Value 11,939  
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,640)