CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (loss)	Treasury Stock	Total
Balance at Dec. 31, 2015	$ 29	$ 591,053	$ (190,265)	$ 2,340	$ (29,971)	$ 373,186
Increase (decrease) in shareholders' equity
Net income			38,239			38,239
Other comprehensive income				4,418		4,418
Stock issued in acquisition of Pulaski and First Community, net of stock issuance costs	10	195,188				195,198
Issuance of treasury stock for employee stock purchase plan		(552)			805	253
Net issuance of treasury stock for restricted stock unit vesting and related taxes		(2,929)			2,668	(261)
Net issuance of stock options exercised, net of shares redeemed		(923)			923
Cash dividends common stock at $0.54 and $0.51 per share for the period of nine months ended September 2017 and 2016, respectively			(16,253)			(16,253)
Stock dividend equivalents restricted stock units at $0.54 and $0.51 per share for the period of nine months ended September 2017 and 2016, respectively		263	(263)
Stock dividend accrued on restricted stock awards assumed with the Pulaski Financial Corp. acquisition at $0.54 and $0.17 per share for the period of nine months ended September 2017 and 2016, respectively			(10)			(10)
Stock-based employee compensation		1,309				1,309
Return of 28,648 equity trust shares for the period of nine months ended September 2017					(5)	(5)
Balance at Sep. 30, 2016	39	783,409	(168,552)	6,758	(25,580)	596,074
Balance at Dec. 31, 2016	39	781,716	(163,689)	36	(23,788)	594,314
Increase (decrease) in shareholders' equity
Net income			50,433			50,433
Other comprehensive income				423		423
Stock issued in acquisition of Pulaski and First Community, net of stock issuance costs	7	211,575				211,582
Issuance of treasury stock for employee stock purchase plan		(452)			841	389
Net issuance of treasury stock for restricted stock unit vesting and related taxes		(5,221)			4,862	(359)
Net issuance of stock options exercised, net of shares redeemed		(923)			1,088	165
Cash dividends common stock at $0.54 and $0.51 per share for the period of nine months ended September 2017 and 2016, respectively			(21,944)			(21,944)
Stock dividend equivalents restricted stock units at $0.54 and $0.51 per share for the period of nine months ended September 2017 and 2016, respectively		342	(342)
Stock dividend accrued on restricted stock awards assumed with the Pulaski Financial Corp. acquisition at $0.54 and $0.17 per share for the period of nine months ended September 2017 and 2016, respectively			(10)			(10)
Stock-based employee compensation		1,935				1,935
Return of 28,648 equity trust shares for the period of nine months ended September 2017					(860)	(860)
Balance at Sep. 30, 2017	$ 46	$ 988,972	$ (135,552)	$ 459	$ (17,857)	$ 836,068