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Other Income and Other Expense - Other Income and Other Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other income:      
Bank owned life insurance $ 52,984 $ 50,004 $ 56,120
Credit-related fee income 81,558 72,454 72,271
Letter of credit fees 52,724 56,708 59,889
Gains from loan securitization transactions     63,066
Other expense:      
Professional services 346,840 401,946 335,794
Amortization of capitalized servicing rights 49,906 $ 68,410 65,354
Advertising and promotion $ 59,227   $ 56,597