Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES
Net income	$ 27,684	$ 25,374	$ 37,117
Items not requiring (providing) cash
Depreciation and amortization	5,516	6,067	5,724
Provision for loan losses	4,140	11,676	14,129
Gain on sale of investment securities	(2)		(317)
Net accretion of investment securities	(283)	(51)	(7)
Stock-based compensation expense	1,388	1,204	974
Net accretion on assets covered by FDIC loss share	(2,807)	(4,448)	(595)
Gain on FDIC-assisted transactions	(3,411)		(21,314)
Deferred income taxes	485	(3,571)	8,428
Bank owned life insurance income	(1,463)	(1,481)	(1,670)
Changes in
Interest receivable	596	2,237	518
Mortgage loans held for sale	(2,391)	(5,739)	(8,840)
Assets held in trading accounts	1,317	36	(691)
Other assets	1,961	4,742	3,660
Accrued interest and other liabilities	3,054	(2,847)	2,282
Income taxes payable	298	(3,642)	(291)
Net cash provided by operating activities	36,082	29,557	39,107
INVESTING ACTIVITIES
Net (originations) collections of loans	(48,502)	75,516	128,451
Net collections of loans covered by FDIC loss share	83,460	66,967	26,046
Purchases of premises and equipment, net	(2,268)	(14,470)	(4,001)
Proceeds from sale of foreclosed assets held for sale	8,322	20,512	37,310
Proceeds from sale of foreclosed assets held for sale, covered by FDIC loss share	14,560	8,200	4,284
Net purchases of short-term investment securities			(1)
Proceeds from sale of available-for-sale securities	2,576	5,350	75,948
Proceeds from maturities of available-for-sale securities	347,205	302,438	520,883
Purchases of available-for-sale securities	(336,924)	(331,583)	(461,904)
Proceeds from maturities of held-to-maturity securities	713,362	228,284	331,527
Purchases of held-to-maturity securities	(683,820)	(288,505)	(332,655)
Purchases of bank owned life insurance	(25)	(25)	(6,482)
Net cash proceeds received in FDIC-assisted transactions	76,586		99,677
Cash received on FDIC loss share	12,471	28,872	3,751
Net cash provided by investing activities	187,003	101,556	422,834
FINANCING ACTIVITIES
Net change in deposits	(173,379)	41,628	(258,980)
Dividends paid	(13,495)	(13,156)	(13,091)
Net change in other borrowed funds	(8,922)	(44,257)	(95,998)
Repayment of subordinated debentures	(10,310)
Net change in federal funds purchased and securities sold under agreements to repurchase	(32,144)	5,627	3,229
Net shares issued under stock compensation plans	323	474	1,374
Repurchase of common stock	(17,567)	(3,283)
Net cash used in financing activities	(255,494)	(12,967)	(363,466)
(DECREASE) INCREASE IN CASH EQUIVALENTS	(32,409)	118,146	98,475
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	570,206	452,060	353,585
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 537,797	$ 570,206	$ 452,060