Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest income:
Loans, including fees	$ 74,251	$ 72,443
Investment securities:
Taxable	20,120	23,883
Tax-exempt	2,647	2,773
Other interest income	39	36
Total interest income	97,057	99,135
Interest expense:
Savings deposits	961	877
Time deposits	2,574	2,874
Securities sold under repurchase agreements	5,559	5,994
Other borrowings	627	475
Junior subordinated deferrable interest debentures	1,096	1,024
Total interest expense	10,817	11,244
Net interest income	86,240	87,891
Provision for probable loan losses	9,134	2,377
Net interest income after provision for probable loan losses	77,106	85,514
Non-interest income:
Service charges on deposit accounts	18,110	19,192
Other service charges, commissions and fees
Banking	10,377	10,453
Non-banking	1,297	1,110
Investment securities transactions, net	(133)	(1)
Other investments, net	7,851	4,255
Other income	3,429	1,825
Total non-interest income	40,931	36,834
Non-interest expense:
Employee compensation and benefits	30,783	31,752
Occupancy	6,166	6,179
Depreciation of bank premises and equipment	6,180	6,226
Professional fees	3,293	3,247
Deposit insurance assessments	1,493	1,490
Net expense, other real estate owned	878	1,468
Amortization of identified intangible assets	32	119
Advertising	2,105	2,007
Impairment charges (Total other-than-temporary impairment charges, $32 net of $(156), and $122, net of $(349), included in other comprehensive income)	124	227
Other	16,864	14,908
Total non-interest expense	67,918	67,623
Income before income taxes	50,119	54,725
Provision for income taxes	17,135	18,863
Net income	$ 32,984	$ 35,862
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	66,014,114	66,416,252
Net income (in dollars per share)	$ 0.50	$ 0.54
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,118,082	66,555,392
Net income (in dollars per share)	$ 0.50	$ 0.54