Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Loans, including fees	$ 75,401	$ 74,251
Investment securities:
Taxable	19,006	20,120
Tax-exempt	2,491	2,647
Other interest income	83	39
Total interest income	96,981	97,057
Interest expense:
Savings deposits	1,289	961
Time deposits	2,376	2,574
Securities sold under repurchase agreements	3,068	5,559
Other borrowings	1,263	627
Junior subordinated deferrable interest debentures	1,250	1,096
Total interest expense	9,246	10,817
Net interest income	87,735	86,240
Provision for probable loan losses	1,700	9,134
Net interest income after provision for probable loan losses	86,035	77,106
Non-interest income:
Service charges on deposit accounts	17,906	18,110
Other service charges, commissions and fees
Banking	10,385	10,377
Non-banking	1,335	1,297
Investment securities transactions, net	927	(133)
Other investments, net	4,268	7,851
Other income	2,894	3,429
Total non-interest income	37,715	40,931
Non-interest expense:
Employee compensation and benefits	32,730	30,783
Occupancy	5,991	6,166
Depreciation of bank premises and equipment	6,227	6,180
Professional fees	3,716	3,293
Deposit insurance assessments	390	1,493
Net expense, other real estate owned	914	878
Amortization of identified intangible assets	25	32
Advertising	2,268	2,105
Early termination fee - securities sold under repurchase agreements	5,765
Software and software maintenance	3,791	3,311
Impairment charges (Total other-than-temporary impairment charges, $0 and $32, net of $(156), included in other comprehensive loss)		124
Other	13,809	13,553
Total non-interest expense	75,626	67,918
Income before income taxes	48,124	50,119
Provision for income taxes	16,120	17,135
Net income	$ 32,004	$ 32,984
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	65,994,201	66,014,114
Net income (in dollars per share)	$ 0.48	$ 0.50
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,747,499	66,118,082
Net income (in dollars per share)	$ 0.48	$ 0.50