Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash paid during the period for:
Interest	$ 25,685	$ 34,904
Income taxes	8,900	4,400
Non-cash investing and financing activities:
ESOP loan reductions	1,500	1,500
Loans transferred to other real estate owned and repossessed assets	4,053	25,883
Other real estate owned sold and settled out of period	80	7,260
Loans transferred from held to maturity to available for sale	0	823
Gross increase in market value adjustment to securities available for sale	$ 4,529	$ 9,792