Consolidated Statements of Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Interest and fees on loans	$ 133,641	$ 141,616	$ 145,554
Interest on investment securities:
Taxable interest income	3,461	3,410	4,352
Tax-exempt interest income	1,881	1,899	1,958
Other, principally overnight investments	849	586	656
Total interest income	139,832	147,511	152,520
Interest Expense
Savings, checking and money market accounts	1,040	1,493	2,836
Time deposits of $100,000 or more	4,373	5,825	8,132
Other time deposits	1,659	2,642	4,486
Borrowings	1,151	1,025	1,866
Total interest expense	8,223	10,985	17,320
Net interest income	131,609	136,526	135,200
Provision for loan losses - non-covered	7,087	18,266	69,993
Provision for loan losses - covered	3,108	12,350	9,679
Total provision for loan losses	10,195	30,616	79,672
Net interest income after provision for loan losses	121,414	105,910	55,528
Noninterest Income
Service charges on deposit accounts	13,706	12,752	11,865
Other service charges, commissions and fees	10,019	9,318	8,831
Fees from presold mortgage loans	2,726	2,907	2,378
Commissions from sales of insurance and financial products	2,733	2,132	1,832
Bank-owned life insurance income	1,311	1,120	591
Foreclosed property gains (losses) - non-covered	(1,924)	1,333	(15,325)
Foreclosed property gains (losses) - covered	(1,919)	367	(13,035)
FDIC indemnification asset income (expense), net	(12,842)	(6,824)	4,077
Securities gains	786	532	638
Other gains (losses)	(228)	(148)	(463)
Total noninterest income	14,368	23,489	1,389
Noninterest Expenses
Salaries	46,071	45,120	41,336
Employee benefits	9,086	9,644	12,007
Total personnel expense	55,157	54,764	53,343
Occupancy expense	7,362	7,123	6,954
Equipment related expenses	3,931	4,364	4,800
Intangibles amortization	777	860	897
Other operating expenses	30,024	29,508	31,281
Total noninterest expenses	97,251	96,619	97,275
Income (loss) before income taxes	38,531	32,780	(40,358)
Income tax expense (benefit)	13,535	12,081	(16,952)
Net income (loss)	24,996	20,699	(23,406)
Preferred stock dividends	(868)	(895)	(2,809)
Net income (loss) available to common shareholders	$ 24,128	$ 19,804	$ (26,215)
Earnings (loss) per common share: Basic	$ 1.22	$ 1.01	$ (1.54)
Earnings (loss) per common share: Diluted	$ 1.19	$ 0.98	$ (1.54)
Dividends declared per common share	$ 0.32	$ 0.32	$ 0.32
Weighted average common shares outstanding: Basic	19,699,801	19,675,597	17,049,513
Weighted average common shares outstanding: Diluted	20,434,007	20,404,303	17,049,513