Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash paid during the period for:
Interest	$ 12,990	$ 17,278
Income Taxes Paid, Net	2,200	5,700
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service	0	1,000
Non-cash investing and financing activities:
Transfer to Other Real Estate	7,371	3,227
Transfer of Portfolio Loans and Leases to Held-for-sale	20,135	0
Gross increase in market value adjustment to securities available for sale	(27,625)	1,254
Unsettled treasury stock repurchases	$ 0	$ 1,233