Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income:
Interest and fees on loans	$ 220,687	$ 230,882	$ 245,767
Interest and dividends on investment securities:
Taxable	31,237	36,847	41,304
Exempt from federal taxes	4,728	4,923	4,749
Interest on deposits in banks	992	1,235	1,050
Interest on federal funds sold	18	13	13
Total interest income	257,662	273,900	292,883
Interest expense:
Interest on deposits	15,800	22,306	33,533
Interest on securities sold under repurchase agreements	294	579	695
Interest on long-term debt	1,936	1,981	1,975
Interest in preferred stock pending redemption	159	131	0
Interest on subordinated debentures held by subsidiary trusts	2,506	5,117	5,828
Total interest expense	20,695	30,114	42,031
Net interest income	236,967	243,786	250,852
Provision for loan losses	(6,125)	40,750	58,151
Net interest income after provision for loan losses	243,092	203,036	192,701
Non-interest income:
Other service charges, commissions and fees	35,977	34,226	31,689
Income from the origination and sale of loans	34,254	41,790	21,153
Wealth management revenues	17,085	14,314	13,575
Service charges on deposit accounts	16,837	17,412	17,647
Investment securities gains, net	1	348	1,544
Other income	7,525	6,771	6,264
Total non-interest income	111,679	114,861	91,872
Non-interest expense:
Salaries and wages	94,002	89,833	83,560
Employee benefits	30,338	29,345	27,792
Occupancy, net	16,587	15,786	16,223
Furniture and equipment	12,554	12,859	12,562
Outsourced technology services	9,029	8,826	8,933
FDIC insurance premiums	5,057	6,470	7,333
Professional fees	4,773	4,044	3,676
OREO expense, net of income	2,291	9,400	8,652
Mortgage servicing rights amortization	2,787	3,501	3,225
Mortgage servicing rights impairment (recovery)	(99)	(771)	1,275
Core deposit intangibles amortization	1,418	1,420	1,446
Other expenses	43,332	48,922	43,735
Total non-interest expense	222,069	229,635	218,412
Income before income tax expense	132,702	88,262	66,161
Income tax expense	46,566	30,038	21,615
Net income	86,136	58,224	44,546
Preferred stock dividends	0	3,300	3,422
Net income available to common shareholders	$ 86,136	$ 54,924	$ 41,124
Basic earnings per common share	$ 1.98	$ 1.28	$ 0.96
Diluted earnings per common share	$ 1.96	$ 1.27	$ 0.96