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Note Offsetting of financial assets and liabilities (Offsetting of financial assets) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Asset Fair Value Net [Abstract]    
Derivative Fair Value Of Derivative Asset $ 15,012 $ 16,959
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral 15,012 16,959
Derivative Asset Fair Value Gross Liability Not Offset 35 114
Derivative Collateral Obligation To Return Securities 0 0
Derivative Asset Collateral Obligation To Return Cash Offset 0 0
Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral 14,977 16,845
Securities Purchased Under Agreements To Resell Amount Offset Against Collateral [Abstract]    
Securities Purchased Under Agreements To Resell Gross 97,830 96,338
Securities Purchased Under Agreements To Resell Liability 0 0
Securities Purchased Under Agreements To Resell 97,830 96,338
Securities Purchased Under Agreements To Resell Not Offset 0 0
Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities 97,830 96,338
Securities Purchased Under Agreements To Resell Collateral Obligation To Return Cash 0 0
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral, Total 0 0
Offsetting Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed [Abstract]    
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross 112,842 113,297
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability 0 0
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed 112,842 113,297
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability Not Offset 35 114
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities 97,830 96,338
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Cash 0 0
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral $ 14,977 $ 16,845