Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest income:
Loans, including fees	$ 64,617	$ 67,413	$ 128,151	$ 135,736
Investment securities:
Taxable	18,601	23,228	39,120	47,740
Tax-exempt	3,085	2,849	6,121	5,710
Other interest income	21	193	42	279
Total interest income	86,324	93,683	173,434	189,465
Interest expense:
Savings deposits	956	1,479	1,967	3,102
Time deposits	3,978	6,255	8,423	12,740
Securities sold under repurchase agreements	7,312	10,267	14,880	20,569
Other borrowings	289	138	579	346
Junior subordinated interest deferrable debentures	1,165	1,901	2,329	3,948
Total interest expense	13,700	20,040	28,178	40,705
Net interest income	72,624	73,643	145,256	148,760
Provision for probable loan losses	4,342	6,107	11,761	11,392
Net interest income after provision for probable loan losses	68,282	67,536	133,495	137,368
Non-interest income:
Service charges on deposit accounts	23,507	23,100	47,337	45,853
Other service charges, commissions and fees
Banking	10,052	9,424	20,035	19,488
Non-banking	1,515	1,682	2,576	2,933
Investment securities transactions, net		1,420	9,601	2,592
Other investments, net	8,635	2,647	15,632	7,781
Other income	2,996	2,546	4,776	5,349
Total non-interest income	46,705	40,819	99,957	83,996
Non-interest expense:
Employee compensation and benefits	30,764	30,210	60,975	59,611
Occupancy	7,180	8,107	14,992	16,841
Depreciation of bank premises and equipment	6,619	6,790	13,244	13,717
Professional fees	3,952	4,171	7,675	7,541
Deposit insurance assessments	1,762	1,490	3,378	3,057
Net expense, other real estate owned	1,575	1,385	3,364	2,566
Amortization of identified intangible assets	1,158	1,163	2,295	2,300
Advertising	2,023	1,970	3,869	3,797
Early termination fee - securities sold under repurchase agreements	2,418		12,303
Impairment charges (Total other-than-temporary impairment losses, $(953), net of $(1,370), $(301), net of $(523), $15, net of $(712), and $1,349, net of $941, included in other comprehensive income)	417	222	727	408
Other	15,846	16,583	31,753	30,396
Total non-interest expense	73,714	72,091	154,575	140,234
Income before income taxes	41,273	36,264	78,877	81,130
Provision for income taxes	13,760	11,714	23,295	24,893
Net income	27,513	24,550	55,582	56,237
Preferred stock dividends		3,355		6,698
Net income available to common shareholders	$ 27,513	$ 21,195	$ 55,582	$ 49,539
Basic earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,190,792	67,244,005	67,189,196	67,257,456
Net income (in dollars per share)	$ 0.41	$ 0.32	$ 0.83	$ 0.74
Fully diluted earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,292,053	67,323,912	67,286,026	67,339,550
Net income (in dollars per share)	$ 0.41	$ 0.31	$ 0.83	$ 0.74