Consolidated statements of changes in shareholders' equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net
Balance at Dec. 31, 2015	$ 236,674	$ 17,180	$ 94,544	$ 122,493	$ 2,457
Net income	31,581			31,581
Other comprehensive income, net of taxes	6,137				6,137
Common stock issued, net of offering costs	115,525	6,765	108,760
Conversion of cash-settled to stock-settled for, Equity based incentive plans	2,388		2,388
Conversion of cash-settled to stock-settled for, Deferred compensation plan	3,000		3,000
Stock based compensation expense	3,373		3,373
Restricted stock units vested and distributed, net of shares withheld for taxes	(270)	30	(300)
Cash dividends paid	(69,300)			(69,300)
Balance at Sep. 30, 2016	329,108	23,975	211,765	84,774	8,594
Balance at Dec. 31, 2016	330,498	24,108	213,480	93,784	(874)
Initial fair value election on mortgage servicing rights, net of taxes of $396 (See Note 1)	615			615
Net income	29,380			29,380
Other comprehensive income, net of taxes	2,445				2,445
Common stock issued, net of offering costs	152,721	4,807	147,914
Common stock issued in conjunction with acquisition of the Clayton Banks, net of issuance costs (See Note 2)	52,284	1,521	50,763
Stock based compensation expense	4,808	9	4,799
Restricted stock units vested and distributed, net of shares withheld for taxes	(858)	63	(921)
Shares issued under employee stock purchase program	635	19	616
Balance at Sep. 30, 2017	$ 572,528	$ 30,527	$ 416,651	$ 123,779	$ 1,571