Note Loans (Loans held-for-sale, by main loan categories) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale, at lower of cost or fair value	$ 125,315	$ 137,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale, at lower of cost or fair value	42,771	45,074
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale, at lower of cost or fair value	2	95
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale, at lower of cost or fair value	$ 82,542	$ 91,831