Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 24,122	$ 17,766
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,976	7,784
Provision for loan losses	11,408	23,179
Deferred income taxes	3,173	1,907
Other-than-temporary impairment on securities		100
Gain on sale of securities	(61)	(333)
Gains on acquisitions		(16,529)
Gains on OREO sales	(6,961)	(2,089)
Share-based compensation expense	1,292	1,341
Loss on disposal of premises and equipment	2	61
Amortization of FDIC indemnification asset	14,226	7,049
Accretion on acquired loans	(36,983)	(11,905)
Net amortization of investment securities	2,671	1,136
OREO write downs	13,648	17,739
Net change in:
Loans held for sale	(25,776)	(3,166)
Accrued interest receivable	2,682	593
Prepaid assets	1,108	2,748
FDIC loss share receivable	74,105	68,570
Accrued interest payable	(1,443)	(3,964)
Accrued income taxes	(9,071)	(1,325)
Miscellaneous assets and liabilities	(40,956)	(39,857)
Net cash provided by operating activities	36,162	70,805
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	25,359	52,282
Proceeds from maturities and calls of investment securities held to maturity		1,240
Proceeds from maturities and calls of investment securities available for sale	73,306	70,222
Proceeds from sales of other investment securities	12,429	5,651
Purchases of investment securities available for sale	(110,081)	(108,366)
Purchases of other investment securities		(1,041)
Net (increase) decrease in customer loans	90,835	(37,540)
Net cash received from acquisitions	10,923	136,716
Purchases of premises and equipment	(11,509)	(12,922)
Proceeds from sale of premises and equipment	33	26
Proceeds from sale of OREO	50,884	41,322
Net cash provided by investing activities	142,179	147,590
Cash flows from financing activities:
Net decrease in deposits	(100,243)	(257,725)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	36,352	(8,090)
Repayment of FHLB advances and other borrowings	(875)	(59,128)
Common stock issuance	361	35,181
Common stock repurchased	(674)	(252)
Dividends paid on common stock	(7,522)	(7,131)
Stock options exercised	899	423
Net cash used in financing activities	(71,702)	(296,722)
Net increase (decrease) in cash and cash equivalents	106,639	(78,327)
Cash and cash equivalents at beginning of period	171,425	237,099
Cash and cash equivalents at end of period	278,064	158,772
Cash paid for:
Interest	9,076	18,614
Income taxes	18,216	8,240
Noncash investing activities:
Transfers of loans to foreclosed properties (covered of $19,146 and $33,697, respectively; and non-covered of $21,185 and $19,801, respectively)	$ 40,331	$ 53,498