CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Pulaski Accumulated (Deficit)	Pulaski	First Community Common Stock	First Community Additional Paid-in Capital	First Community	Common Stock	Additional Paid-in Capital	Accumulated (Deficit)	Accumulated Other Comprehensive Income (loss)	Treasury Stock	Total
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 loss									423		423
Issuance of treasury stock for employee stock purchase plan							(452)			841	389
Net issuance of treasury stock for restricted stock unit vesting and related tax benefit							(5,221)			4,862	(359)
Net issuance of stock options exercised net of shares redeemed							(923)			1,088	165
Stock issued for acquisition of First Community, net of stock issuance costs			$ 7	$ 211,575	$ 211,582
Cash dividends common stock at $0.60 and $0.54 per share for nine months ended September 30, 2018 and 2017 respectively								(21,944)			(21,944)
Stock dividend equivalents restricted stock units at $0.60 and $0.54 per share for nine months ended September 30, 2018 and 2017 respectively							342	(342)
Stock dividend accrued on restricted stock awards assumed with the Pulaski Financial Corp. (“Pulaski”) acquisition at $0.54 per share	$ (10)	$ (10)
Return of 28,648 equity trust shares										(860)	(860)
Stock-based compensation							1,935				1,935
Balance at Sep. 30, 2017						46	988,972	(135,552)	459	(17,857)	836,068
Balance at Dec. 31, 2017						49	1,084,889	(132,122)	(2,810)	(15,003)	935,003
Increase (decrease) in shareholders' equity
Net income								73,638			73,638
Other comprehensive loss									(9,609)		(9,609)
Tax Cuts and Jobs Act (“TCJA”) of 2017 reclassification								605	(605)
Issuance of treasury stock for employee stock purchase plan							(295)			724	429
Net issuance of treasury stock for restricted stock unit vesting and related tax benefit							(6,059)			4,924	(1,135)
Net issuance of stock options exercised net of shares redeemed							(2,505)			2,891	386
Cash dividends common stock at $0.60 and $0.54 per share for nine months ended September 30, 2018 and 2017 respectively								(29,238)			(29,238)
Stock dividend equivalents restricted stock units at $0.60 and $0.54 per share for nine months ended September 30, 2018 and 2017 respectively							415	(415)
Stock-based compensation							2,666				2,666
Balance at Sep. 30, 2018						$ 49	$ 1,079,111	$ (87,532)	$ (13,024)	$ (6,464)	$ 972,140