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Securities Sold Under Agreements to Repurchase - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 2,389,619 $ 2,249,861
Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,982,500  
2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 270,917 1,759,559
30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 135,452 489,302
Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 750 1,000
U.S. Treasury [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   2,440
U.S. Treasury [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   2,440
U.S. Agencies [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,389,619 2,247,421
U.S. Agencies [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,982,500  
U.S. Agencies [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 270,917 1,757,119
U.S. Agencies [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 135,452 489,302
U.S. Agencies [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 750 $ 1,000