Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest income:
Loans, including fees	$ 67,872	$ 63,534
Investment securities:
Taxable	26,179	20,519
Tax-exempt	3,523	3,036
Other interest income	63	21
Total interest income	97,637	87,110
Interest expense:
Savings deposits	871	1,011
Time deposits	3,120	4,445
Securities sold under repurchase agreements	6,236	7,568
Other borrowings	556	290
Junior subordinated interest deferrable debentures	1,090	1,164
Total interest expense	11,873	14,478
Net interest income	85,764	72,632
Provision for probable loan losses	2,078	7,419
Net interest income after provision for probable loan losses	83,686	65,213
Non-interest income:
Service charges on deposit accounts	22,062	23,830
Other service charges, commissions and fees
Banking	10,820	9,983
Non-banking	1,899	1,061
Investment securities transactions, net	8,108	9,601
Other investments, net	9,058	6,997
Other income	6,239	1,780
Total non-interest income	58,186	53,252
Non-interest expense:
Employee compensation and benefits	30,245	30,211
Occupancy	7,008	7,812
Depreciation of bank premises and equipment	6,092	6,625
Professional fees	3,612	3,723
Deposit insurance assessments	1,439	1,616
Net expense, other real estate owned	929	1,789
Amortization of identified intangible assets	981	1,137
Advertising	1,830	1,846
Early termination fee - securities sold under repurchase agreements	11,000	9,885
Impairment charges (Total other-than-temporary impairment charges, $32 net of $(122), and $968, net of $658, included in other comprehensive loss)	90	310
Other	14,470	15,907
Total non-interest expense	77,696	80,861
Income before income taxes	64,176	37,604
Provision for income taxes	20,530	9,535
Net income	$ 43,646	$ 28,069
Basic earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,130,971	67,187,583
Net income (in dollars per share)	$ 0.65	$ 0.42
Fully diluted earnings per common share:
Weighted average number of shares outstanding: (in shares)	67,272,299	67,279,981
Net income (in dollars per share)	$ 0.65	$ 0.42