Borrowings (Retail Repurchase Agreements And Other Short Term Borrowings) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Retail repurchase agreements carrying amount	$ 109,145	$ 74,432	$ 53,842
Retail repurchase agreements average	110,776	70,097	55,769
Retail repurchase agreements maximum	$ 128,511	$ 82,702	$ 59,410
Retail Repurchase Agreements Interest Rate	0.23%	0.24%	0.20%
Retail Repurchase Agreements Average Interest Rate	0.23%	0.23%	0.26%