Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:
Loans, including fees	$ 66,482	$ 67,254	$ 194,633	$ 202,990
Investment securities:
Taxable	21,821	23,388	60,941	71,128
Tax-exempt	3,318	2,972	9,439	8,682
Other interest income	29	161	71	440
Total interest income	91,650	93,775	265,084	283,240
Interest expense:
Savings deposits	885	1,074	2,852	4,176
Time deposits	3,644	5,910	12,067	18,650
Securities sold under repurchase agreements	7,162	8,811	22,042	29,380
Other borrowings	454	195	1,033	541
Junior subordinated interest deferrable debentures	862	1,430	3,191	5,378
Total interest expense	13,007	17,420	41,185	58,125
Net interest income	78,643	76,355	223,899	225,115
Provision for probable loan losses	5,800	5,349	17,561	16,741
Net interest income after provision for probable loan losses	72,843	71,006	206,338	208,374
Non-interest income:
Service charges on deposit accounts	25,026	23,748	72,363	69,601
Other service charges, commissions and fees
Banking	11,327	9,492	31,362	28,980
Non-banking	2,092	2,038	4,668	4,971
Investment securities transactions, net		32,935	9,601	35,527
Other investments, net	3,871	3,650	19,503	11,431
Other income	2,165	2,144	6,941	7,493
Total non-interest income	44,481	74,007	144,438	158,003
Non-interest expense:
Employee compensation and benefits	30,627	30,541	91,602	90,152
Occupancy	7,604	8,032	22,596	24,873
Depreciation of bank premises and equipment	6,433	6,618	19,677	20,335
Professional fees	3,669	4,279	11,344	11,820
Deposit insurance assessments	1,683	2,289	5,061	5,346
Net expense, other real estate owned	1,360	3,065	4,724	5,631
Amortization of identified intangible assets	1,156	1,163	3,451	3,463
Advertising	1,795	1,713	5,664	5,510
Early termination fee - securities sold under repurchase agreements		31,550	12,303	31,550
Impairment charges (Total other-than-temporary impairment losses, $(13), net of $(560), $(402), net of $(641), $(27), net of $(1,273), and $947, net of $300, included in other comprehensive loss)	573	239	1,300	647
Other	15,327	16,955	47,080	47,351
Total non-interest expense	70,227	106,444	224,802	246,678
Income before income taxes	47,097	38,569	125,974	119,699
Provision for income taxes	15,271	12,691	38,566	37,584
Net income	31,826	25,878	87,408	82,115
Preferred stock dividends		3,845		10,543
Net income available to common shareholders	$ 31,826	$ 22,033	$ 87,408	$ 71,572
Basic earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,197,847	67,225,701	67,192,112	67,246,793
Net income (in dollars per share)	$ 0.47	$ 0.33	$ 1.30	$ 1.06
Fully diluted earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,333,442	67,301,701	67,301,863	67,326,856
Net income (in dollars per share)	$ 0.47	$ 0.33	$ 1.30	$ 1.06