Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash paid during the period for:
Interest	$ 7,072	$ 3,832
Income Taxes Paid, Net	28	1,039
Non-cash investing and financing activities:
Loans Transferred to Other Real Estate Owned and Repossessions	1,186	958
Fair value of loans transferred from held to maturity to held for sale	8,019	3,613
Gross (decrease) increase in market value adjustment to securities available for sale	(6,822)	1,892
Gross decrease in market value adjustment to derivatives	(131)	(438)
Investments committed to purchase not settled	0	498
Unsettled Bank Owned Life Insurance Proceeds	2,306	0
Other operating expenses	5,843	4,980
Stock Issued During Period, Value, Treasury Stock Reissued	$ 2,257	$ 2,258