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Borrowings - Amounts and Interest Rates of Short-term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Borrowings [Line Items]      
Other Short-term borrowings   $ 50,023  
Federal funds purchased and short term borrowings 1,074,482 782,082 947,432
Weighted-average interest rate 0.11% 0.09% 0.19%
Daily-average amount outstanding 838,902 826,808 1,854,033
Weighted-average interest rate 0.15% 0.12% 0.16%
Federal Funds Purchased and Repurchase Agreements [Member]
     
Schedule Of Borrowings [Line Items]      
Federal Funds Purchased and Repurchase Agreements 1,074,482 732,059 866,555
Weighted-average interest rate 0.11% 0.04% 0.19%
Highest amount at a month-end 1,224,194 1,389,237 2,612,727
Daily-average amount outstanding 822,859 706,749 1,749,525
Weighted-average interest rate 0.15% 0.11% 0.15%
Other Short-term Borrowings [Member]
     
Schedule Of Borrowings [Line Items]      
Other Short-term borrowings   50,023 80,877
Weighted-average interest rate   0.70% 0.20%
Highest amount at a month-end 50,016 142,927 236,842
Daily-average amount outstanding $ 16,043 $ 120,059 $ 104,508
Weighted-average interest rate 0.57% 0.18% 0.33%