Note Borrowings (Other short-term borrowings and maximum aggregate balance of short term borrowings) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Advances with the FHLB paying interest at maturity	$ 0	$ 95,000
Other Borrowings	1,200	1,208
Total other short-term borrowings	$ 1,200	$ 96,208