Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash paid during the period for:
Interest	$ 4,674	$ 4,004
Income Taxes Paid, Net	1,000	1,500
Non-cash investing and financing activities:
Loans Transferred to Other Real Estate Owned and Repossessions	1,355	797
Fair value of loans transferred from held to maturity to held for sale	0	3,011
Gross increase in market value adjustment to securities available for sale	10,070	9,869
Gross increase in market value adjustment to derivatives	1,720	1,200
Investments committed to purchase not settled	600	637
Unsettled treasury stock repurchases	$ 0	$ 453