Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
OPERATING ACTIVITIES
Net income	$ 12,891,000	$ 13,562,000	$ 11,812,000
Items not requiring (providing) cash
Depreciation and amortization	2,751,000		3,052,000
Provision for loan losses	1,546,000		6,003,000
Net (accretion) amortization of investment securities	(138,000)		12,000
Stock-based compensation expense	769,291		613,000
Net accretion on assets covered by FDIC loss share agreements	(1,494,000)		(2,317,000)
Deferred income taxes	(802,000)		(2,495,000)
Bank owned life insurance income	(723,000)		(817,000)
Changes in
Interest receivable	2,151,000		2,160,000
Mortgage loans held for sale	7,481,000		7,254,000
Assets held in trading accounts	(271,000)		221,000
Other assets	2,014,000		3,318,000
Accrued interest and other liabilities	1,816,000		(1,208,000)
Income taxes payable	897,000		2,215,000
Net cash provided by operating activities	28,888,000		29,823,000
INVESTING ACTIVITIES
Net collections of covered loans	43,343,000		31,873,000
Net (originations) collections of loans	(41,648,000)		30,637,000
Purchases of premises and equipment, net	(1,288,000)		(7,550,000)
Proceeds from sale of covered other real estate owned	7,875,000		4,281,000
Proceeds from sale of foreclosed assets held for sale	2,364,000		15,307,000
Proceeds from sale of available-for-sale securities	730,000		2,933,000
Proceeds from maturities of available-for-sale securities	153,832,000		126,831,000
Purchases of available-for-sale securities	(149,254,000)		(159,974,000)
Proceeds from maturities of held-to-maturity securities	310,755,000		128,571,000
Purchases of held-to-maturity securities	(310,695,000)		(69,750,000)
Purchase of bank owned life insurance	(25,000)		(25,000)
Cash received on FDIC loss share	9,682,000		21,249,000
Net cash provided by investing activities	25,671,000		124,383,000
FINANCING ACTIVITIES
Net change in deposits	(21,113,000)		(1,589,000)
Dividends paid	(6,838,000)		(6,588,000)
Net change in other borrowed funds	696,000		(41,056,000)
Net change in federal funds purchased and securities sold under agreements to repurchase	(44,546,000)		(15,579,000)
Net shares issued under stock compensation plans	324,000		473,000
Repurchase of common stock	(7,706,000)
Net cash used in financing activities	(79,183,000)		(64,339,000)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(24,624,000)		89,867,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	570,206,000	541,927,000	452,060,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 545,582,000	$ 570,206,000	$ 541,927,000