BORROWINGS (Retail Repurchase Agreements And Other Short Term Borrowings) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Retail repurchase agreements carrying amount	$ 119,359	$ 125,119	$ 109,145
Retail repurchase agreements average	133,356	120,711	110,776
Retail repurchase agreements maximum	$ 147,459	$ 139,325	$ 128,511
Retail Repurchase Agreements Interest Rate	0.24%	0.24%	0.23%
Retail Repurchase Agreements Average Interest Rate	0.25%	0.24%	0.23%