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Borrowings - Lines of Credit Under Formal Agreements (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
M&T Bank [Member]  
Schedule Of Borrowings [Line Items]  
Outstanding borrowings $ 3,108,243
Unused 29,189,620
Wilmington Trust, N.A. [Member]  
Schedule Of Borrowings [Line Items]  
Unused $ 147,739