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Borrowed Funds - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 3,511,656 $ 3,292,805
Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,746,941  
2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   2,532,305
30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 761,715 759,500
Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 3,000 1,000
U.S. Treasury [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,152,251 1,355,233
U.S. Treasury [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,152,251  
U.S. Treasury [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   1,355,233
U.S. Agencies [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,359,405 1,937,572
U.S. Agencies [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,594,690  
U.S. Agencies [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   1,177,072
U.S. Agencies [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 761,715 759,500
U.S. Agencies [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 3,000 $ 1,000