Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans, including fees	$ 83,394	$ 74,388	$ 238,261	$ 223,245
Investment securities:
Taxable	21,003	19,630	60,998	60,346
Tax-exempt	2,409	2,561	7,357	7,835
Other interest income	139	45	484	151
Total interest income	106,945	96,624	307,100	291,577
Interest expense:
Savings deposits	1,599	1,173	4,241	3,333
Time deposits	2,426	2,551	7,203	7,519
Securities sold under repurchase agreements	1,177	5,480	5,391	16,591
Other borrowings	3,396	812	7,234	2,196
Junior subordinated deferrable interest debentures	1,395	1,159	3,967	3,377
Total interest expense	9,993	11,175	28,036	33,016
Net interest income	96,952	85,449	279,064	258,561
Provision for probable loan losses	6,591	(1,347)	9,096	14,884
Net interest income after provision for probable loan losses	90,361	86,796	269,968	243,677
Non-interest income:
Service charges on deposit accounts	18,706	19,035	54,494	54,999
Other service charges, commissions and fees
Banking	13,095	13,722	34,505	35,056
Non-banking	1,853	1,803	5,052	4,794
Investment securities transactions, net		(1,345)	(1,612)	(1,705)
Other investments, net	4,938	4,082	12,036	14,699
Other income	2,774	3,233	8,569	10,229
Total non-interest income	41,366	40,530	113,044	118,072
Non-interest expense:
Employee compensation and benefits	33,787	33,908	99,256	95,846
Occupancy	6,416	6,153	18,824	18,225
Depreciation of bank premises and equipment	6,407	6,175	18,936	18,563
Professional fees	3,577	3,661	11,143	10,400
Deposit insurance assessments	1,007	1,332	2,310	4,333
Net expense, other real estate owned	(407)	2,320	989	4,575
Amortization of identified intangible assets		32	25	96
Advertising	2,064	1,921	6,448	6,345
Early termination fee - securities sold under repurchase agreements		1,799	5,765	1,799
Software and software maintenance	4,302	3,687	12,155	10,721
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)		90		281
Other	14,558	15,589	45,199	45,385
Total non-interest expense	71,711	76,667	221,050	216,569
Income before income taxes	60,016	50,659	161,962	145,180
Provision for income taxes	20,388	14,872	49,761	46,721
Net income	$ 39,628	$ 35,787	$ 112,201	$ 98,459
Basic earnings per common share:
Weighted average number of shares outstanding (in shares)	66,060,829	65,948,815	66,036,501	65,968,975
Net income (in dollars per share)	$ 0.60	$ 0.54	$ 1.70	$ 1.49
Fully diluted earnings per common share:
Weighted average number of shares outstanding (in shares)	66,745,350	66,291,556	66,736,250	66,189,507
Net income (in dollars per share)	$ 0.59	$ 0.54	$ 1.68	$ 1.49