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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total $ 5,784,754 $ 5,313,209
Fair Value 5,970,115 $ 5,385,091
Pooled Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 13,763  
Fair Value 7,913  
Available-for-Sale, Unrealized Gain/ (Loss) $ (5,850)  
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 $ 4,223  
Fair Value 2,331  
Available-for-Sale, Unrealized Gain/ (Loss) $ (1,892)  
Number of Issuers Currently Performing | security 32  
Number Of Issuers Currently Remaining | security 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 35.10%  
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 $ 9,540  
Fair Value 5,582  
Available-for-Sale, Unrealized Gain/ (Loss) $ (3,958)  
Number of Issuers Currently Performing | security 39  
Number Of Issuers Currently Remaining | security 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 52.00%  
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 $ 4,809  
Fair Value 4,463  
Available-for-Sale, Unrealized Gain/ (Loss) (346)  
Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 18,572  
Fair Value 12,376  
Available-for-Sale, Unrealized Gain/ (Loss) $ (6,196)