Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash paid during the period for:
Interest	$ 18,115	$ 25,685
Income Taxes Paid, Net	3,080	8,900
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service	0	1,500
Non-cash investing and financing activities:
Transfer to Other Real Estate	8,847	4,053
Transfer of Portfolio Loans and Leases to Held-for-sale	20,135	0
Gross increase in market value adjustment to securities available for sale	(31,866)	4,529
Unsettled treasury stock repurchases	$ 1,670	$ 0