Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 30,032	$ 22,595	$ 51,882
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,092	10,767	9,290
Provision for loan losses	13,619	30,236	54,282
Deferred income taxes	25,086	(10,201)	23,979
Other-than-temporary impairment on securities		115	6,770
Gain on sale of securities available for sale	(189)	(323)	(292)
Gain on acquisition		(16,529)	(98,081)
Share-based compensation expense	1,741	1,777	1,625
Federal Home Loan Bank advances prepayment fee			3,189
Amortization (accretion) on FDIC indemnification asset	20,773	10,135	(2,443)
Accretion on acquired loans	(52,011)	(16,099)	(927)
Loss on sale of assets	10	63	132
Gain on sale of OREO	(8,482)	(2,655)	(535)
Net amortization of premium on investment securities	3,893	1,682	937
OREO write downs	13,190	29,010	2,773
Net change in:
Originations and purchases of mortgage loans for sale	(908,034)	(548,794)	(619,185)
Proceeds from sales of mortgage loans for sale	888,564	545,689	594,045
Accrued interest receivable	5,252	1,941	4,287
Prepaid assets	1,239	3,743	3,967
FDIC Loss Share Receivable	95,707	77,488	67,130
Miscellaneous other assets	(1,028)	1,855	7,469
Accrued interest payable	(1,651)	(4,382)	(5,225)
Accrued income taxes	(12,502)	2,064	(6,047)
Miscellaneous other liabilities	(8,921)	14,768	4,259
Net cash provided by operating activities	118,380	154,945	103,281
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	29,301	52,282	45,030
Proceeds from maturities and calls of investment securities held to maturity	1,129	3,370	1,595
Proceeds from maturities of investment securities available for sale	101,582	100,026	144,663
Proceeds from sales of other investment securities	13,251	7,781	1,632
Purchases of investment securities available for sale	(130,078)	(146,272)	(117,473)
Purchases of other investment securities		(1,041)
Net (increase) decrease in customer loans	49,950	(74,892)	(79,397)
Net cash received from acquisitions	97,093	136,717	306,298
Purchases of premises and equipment	(8,387)	(19,463)	(24,173)
Proceeds from sale of OREO	75,970	56,809	21,722
Proceeds from sale of premises and equipment	58	28	52
Net cash provided by investing activities	229,869	115,345	299,949
Cash flows from financing activities:
Net decrease in deposits	(142,812)	(290,906)	(108,997)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	35,152	(12,338)	26,942
Repayment of FHLB advances	(22,168)	(59,128)	(166,025)
Repayment of subordinated term loan			(15,000)
Common stock issuance	720	35,533	669
Common stock repurchased	(836)	(342)	(255)
Dividends paid on common stock	(10,244)	(9,514)	(8,680)
Stock options exercised	1,244	731	307
Net cash used in financing activities	(138,944)	(335,964)	(271,039)
Net increase (decrease) in cash and cash equivalents	209,305	(65,674)	132,191
Cash and cash equivalents at beginning of period	171,425	237,099	104,908
Cash and cash equivalents at end of period	380,730	171,425	237,099
Cash paid for:
Interest	11,303	22,870	30,938
Income taxes	18,578	12,981	9,420
Acquisitions:
Fair value of tangible assets acquired	1,321,482	540,547	956,318
Other intangible assets acquired	15,833	3,813	8,535
Liabilities assumed	1,261,563	603,774	1,098,400
Net identifiable assets acquired over (under) liabilities assumed	75,752	(59,414)	(133,547)
Real estate acquired in full or in partial settlement of loans (covered of $20,631, $39,793, and $55,947, respectively; and non-covered of $25,958, $21,342, and $25,585, respectively)	$ 46,589	$ 61,135	$ 81,532