Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Summarized unaudited quarterly financial data

Summarized unaudited quarterly financial data is as follows:

	Quarters ended 2015
(Dollars in thousands, except per share data)	March 31		June 30	September 30	December 31
Interest income	$	77,486	78,617	80,367	83,211
Interest expense	7,382		7,369	7,309	7,215
Net interest income	70,104		71,248	73,058	75,996
Provision for loan losses	765		282	826	411
Net interest income after provision for loan losses	69,339		70,966	72,232	75,585
Non-interest income	22,693		25,802	25,799	24,467
Non-interest expense	55,497		59,945	59,112	62,203
Income before income taxes	36,535		36,823	38,919	37,849
Federal and state income tax expense	8,865		7,488	9,305	8,341
Net income	$	27,670	29,335	29,614	29,508
Basic earnings per share	$	0.37	0.39	0.39	0.39
Diluted earnings per share	$	0.37	0.39	0.39	0.39

	Quarters ended 2014
(Dollars in thousands, except per share data)	March 31		June 30	September 30	December 31
Interest income	$	74,087	73,963	75,690	76,179
Interest expense	6,640		6,528	6,430	7,368
Net interest income	67,447		67,435	69,260	68,811
Provision for loan losses	1,122		239	360	191
Net interest income after provision for loan losses	66,325		67,196	68,900	68,620
Non-interest income	19,388		22,504	24,432	23,978
Non-interest expense	50,070		52,673	54,238	55,698
Income before income taxes	35,643		37,027	39,094	36,900
Federal and state income tax expense	8,913		8,350	9,800	8,846
Net income	$	26,730	28,677	29,294	28,054
Basic earnings per share	$	0.36	0.38	0.40	0.37
Diluted earnings per share	$	0.36	0.38	0.40	0.37