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Borrowed Funds - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 2,766,096 $ 2,539,310
Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,141,931  
2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 20,238 2,105,512
30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 602,527 431,048
Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,400 2,750
U.S. Treasury [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 687,086 608,836
U.S. Treasury [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 687,086  
U.S. Treasury [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements   608,836
U.S. Agencies [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,079,010 1,930,474
U.S. Agencies [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,454,845  
U.S. Agencies [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 20,238 1,496,676
U.S. Agencies [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 602,527 431,048
U.S. Agencies [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 1,400 $ 2,750