CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income:
Interest and fees on loans	$ 98,614	$ 114,791	$ 138,860
Interest and dividends on investment securities:
Taxable interest income	14,626	15,192	14,344
Non-taxable interest income	3,676	2,836	2,979
Total interest income	116,916	132,819	156,183
Interest expense:
Deposits	12,496	18,660	32,714
Securities sold under agreements to repurchase	279	367	554
Short-term borrowings	35	38	86
Long-term debt	648	1,442	2,930
Junior subordinated debt owed to unconsolidated trusts	1,312	1,919	2,748
Total interest expense	14,770	22,426	39,032
Net interest income	102,146	110,393	117,151
Provision for loan losses	16,500	20,000	42,000
Net interest income after provision for loan losses	85,646	90,393	75,151
Other income:
Trust fees	17,592	15,657	14,231
Commissions and brokers' fees, net	2,102	1,858	1,756
Remittance processing	8,426	9,196	9,349
Service charges on deposit accounts	11,646	12,616	11,490
Other service charges and fees	5,717	5,298	5,102
Gain on sales of loans	12,535	10,945	16,130
Security gains, net	1,597	170	1,018
Other	7,237	3,275	3,677
Total other income	66,852	59,015	62,753
Other expense:
Salaries and wages	53,668	43,344	41,219
Employee benefits	11,124	9,896	9,693
Net occupancy expense of premises	8,899	8,897	9,135
Furniture and equipment expenses	5,146	5,277	5,962
Data processing	11,061	8,635	7,977
Amortization of intangible assets	3,315	3,538	4,088
Regulatory expense	2,543	4,109	6,978
OREO expense	1,303	1,192	1,872
Other	22,585	19,677	18,286
Total other expense	119,644	104,565	105,210
Income before income taxes	32,854	44,843	32,694
Income taxes	10,497	14,970	9,464
Net income	22,357	29,873	23,230
Preferred stock dividends and discount accretion	3,633	5,342	5,170
Income available for common stockholders	$ 18,724	$ 24,531	$ 18,060
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.29	$ 0.27
Diluted earnings per share (in dollars per share)	$ 0.22	$ 0.29	$ 0.27