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Borrowed Funds - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 2,177,566 $ 2,105,831
2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,919,876 1,830,542
30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 169,190 186,289
Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 88,500 89,000
U.S. Treasury [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 209,048 163,146
U.S. Treasury [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 167,889 119,528
U.S. Treasury [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 41,159 43,618
U.S. Agencies [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,968,518 1,942,685
U.S. Agencies [Member] | 2 to 29 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 1,751,987 1,711,014
U.S. Agencies [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements 169,190 186,289
U.S. Agencies [Member] | Over 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total repurchase agreements $ 47,341 $ 45,382