Loans and Allowance for Loan Losses Composition of Loans, Net of Unearned income (Parenthetical) (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 10,906,386,000	[1]	$ 8,946,933,000	[1]
Credit Card Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	85,000,000		64,000,000
Real estate secured loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	873,255,000		685,300,000
Real estate secured loans | Loans for personal residence
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	685,327,000		503,378,000
Real estate secured loans | Loans to eligible employees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	121,548,000		110,584,000
Real estate secured loans | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	66,380,000		71,338,000
Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	664,834,000		557,024,000
Loans Receivable, Gross, Commercial, Construction	112,000,000		148,000,000
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 972,966,000		$ 829,957,000

[1] Included within our total loan portfolio are credit card loans of $85 million and $64 million at December 31, 2013 and 2012, respectively.