Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash paid during the period for:
Interest	$ 11,682	$ 14,747
Income Taxes Paid, Net	4,000	7,700
Non-cash investing and financing activities:
Loans Transferred to Other Real Estate Owned and Repossessions	7,413	4,239
Fair value of loans transferred from held to maturity to held for sale	3,071	3,035
Gross increase in market value adjustment to securities available for sale	12,381	16,812
Gross increase (decrease) in market value adjustment to derivatives	2,167	(27)
Investments committed to purchase not settled	$ 1,350	$ 1,000