v3.26.1
Borrowed Funds - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 3,059,080 $ 3,292,805
Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 2,207,712  
2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 152,245 2,532,305
30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 685,573 759,500
Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 13,550 1,000
U.S. Treasury [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 369,417 1,355,233
U.S. Treasury [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 369,417  
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 2,689,663 1,937,572
U.S. Agencies [Member] | Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,838,295  
U.S. Agencies [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 152,245 1,177,072
U.S. Agencies [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 685,573 759,500
U.S. Agencies [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 13,550 $ 1,000