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Investment Securities - Trust Preferred Securities (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
issuer
Dec. 31, 2020
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total $ 6,660,220 $ 5,784,754
Fair Value 6,724,530 $ 5,970,115
Pooled Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 13,753  
Fair Value 8,210  
Unrealized Gain/ (Loss) $ (5,543)  
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 BB  
Total $ 4,208  
Fair Value 2,415  
Unrealized Gain/ (Loss) $ (1,793)  
Number of Issuers Currently Performing | issuer 32  
Number of Issuers Currently Remaining | issuer 41  
Actual Deferrals and Defaults as a % of Original Collateral 14.40%  
Expected Defaults as a % of Remaining Performing Collateral 10.60%  
Excess Subordination as a % of Current Performing Collateral 42.10%  
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 A  
Total $ 9,545  
Fair Value 5,795  
Unrealized Gain/ (Loss) $ (3,750)  
Number of Issuers Currently Performing | issuer 39  
Number of Issuers Currently Remaining | issuer 41  
Actual Deferrals and Defaults as a % of Original Collateral 4.50%  
Expected Defaults as a % of Remaining Performing Collateral 6.50%  
Excess Subordination as a % of Current Performing Collateral 60.70%  
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 $ 4,813  
Fair Value 4,554  
Unrealized Gain/ (Loss) (259)  
Trust Preferred Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Total 18,566  
Fair Value 12,764  
Unrealized Gain/ (Loss) $ (5,802)