Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans, including fees	$ 79,466	$ 74,606	$ 154,867	$ 148,857
Investment securities:
Taxable	20,989	20,596	39,995	40,716
Tax-exempt	2,457	2,627	4,948	5,274
Other interest income	262	67	345	106
Total interest income	103,174	97,896	200,155	194,953
Interest expense:
Savings deposits	1,353	1,199	2,642	2,160
Time deposits	2,401	2,394	4,777	4,968
Securities sold under repurchase agreements	1,146	5,552	4,214	11,111
Other borrowings	2,575	757	3,838	1,384
Junior subordinated deferrable interest debentures	1,322	1,122	2,572	2,218
Total interest expense	8,797	11,024	18,043	21,841
Net interest income	94,377	86,872	182,112	173,112
Provision for probable loan losses	805	7,097	2,505	16,231
Net interest income after provision for probable loan losses	93,572	79,775	179,607	156,881
Non-interest income:
Service charges on deposit accounts	17,882	17,854	35,788	35,964
Other service charges, commissions and fees
Banking	11,025	10,957	21,410	21,334
Non-banking	1,864	1,694	3,199	2,991
Investment securities transactions, net	(2,539)	(227)	(1,612)	(360)
Other investments, net	2,830	2,766	7,098	10,617
Other income	2,901	3,567	5,795	6,996
Total non-interest income	33,963	36,611	71,678	77,542
Non-interest expense:
Employee compensation and benefits	32,739	31,155	65,469	61,938
Occupancy	6,417	5,906	12,408	12,072
Depreciation of bank premises and equipment	6,302	6,208	12,529	12,388
Professional fees	3,850	3,446	7,566	6,739
Deposit insurance assessments	913	1,508	1,303	3,001
Net expense, other real estate owned	482	1,377	1,396	2,255
Amortization of identified intangible assets		32	25	64
Advertising	2,116	2,319	4,384	4,424
Early termination fee - securities sold under repurchase agreements			5,765
Software and software maintenance	4,062	3,723	7,853	7,034
Impairment charges (Total other-than-temporary impairment charges, $0 net of $0, $(300), net of $(367), $0 net of $0, and $(332) net of $(523) included in other comprehensive loss)		67		191
Other	16,832	16,243	30,641	29,796
Total non-interest expense	73,713	71,984	149,339	139,902
Income before income taxes	53,822	44,402	101,946	94,521
Provision for income taxes	13,253	14,714	29,373	31,849
Net income	$ 40,569	$ 29,688	$ 72,573	$ 62,672
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	66,053,741	66,944,220	66,024,135	65,979,167
Net income (in dollars per share)	$ 0.61	$ 0.45	$ 1.10	$ 0.95
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,715,171	66,159,105	66,731,499	66,138,593
Net income (in dollars per share)	$ 0.61	$ 0.45	$ 1.09	$ 0.95