Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock	Accumulated Other Comprehensive Loss	Treasury Stock	ASB Financial Corp. Common Stock	FIRST PRESTONSBURG BANCSHARES INC. [Member] Common Stock	Restricted Shares	Restricted Shares Common Stock	Restricted Shares Treasury Stock	Accounting Standards Update 2016-01 [Member] Retained Earnings
Common stockholders' equity	$ 458,592	$ 134,362		$ 345,412	$ (5,215)	$ (15,967)
Income tax expense	8,686
Net income	46,255	46,255
Common shares issued under compensation plan for Boards of Directors	298			104		194
Stock-based compensation						0
Issuance of common shares related to acquisition of ASB	40,898						$ 40,898
Common shares issued under employee stock purchase plan	393			123		270
Common shares issued under dividend reinvestment plan	668			668
Stock Issued During Period, Value, Treasury Stock Reissued	46					46			$ 0	$ (2,748)	$ 2,748
Other comprehensive income, net of tax	(2,698)
Repurchase of common shares in connection with employee incentive and director compensation plans	1,380					1,380
Stock Issued During Period, Value, Stock Options Exercised	0			(2)		2
Dividends, Common Stock, Cash	21,578	21,578
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(3,024)											$ 5,020
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | Accounting Standards Update 2016-01 [Member]	(5,020)
Other comprehensive income, net of tax	(7,718)				(7,718)
Other comprehensive income, net of tax	5,020
Purchase of treasury stock						0
Share-based compensation expense	2,359			2,359
Deferred Revenue | Accounting Standards Update 2014-09 [Member]	4,700
Common stockholders' equity	520,140	160,346		386,814	(12,933)	(14,087)
Common stockholders' equity | Accounting Standards Update 2014-09 [Member]			$ (3,713)
Cumulative Effect of Adoption of ASU 2014-09 | Accounting Standards Update 2014-09 [Member]			$ 3,700
Income tax expense	11,663
Net income	53,695	53,695
Common shares issued under compensation plan for Boards of Directors	313			78		235
Issuance of common shares related to acquisition of ASB	32,437							$ 32,437
Common shares issued under employee stock purchase plan	423			112		311
Common shares issued under dividend reinvestment plan	904			904
Stock Issued During Period, Value, Treasury Stock Reissued	53					53			0	(2,931)	2,931
Other comprehensive income, net of tax	11,508
Repurchase of common shares in connection with employee incentive and director compensation plans	845					845
Dividends, Common Stock, Cash	26,892	26,892
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	11,638
Other comprehensive income, net of tax	11,508				11,508
Other comprehensive income, net of tax	0
Other comprehensive income, net of tax | Accounting Standards Update 2016-01 [Member]	5,000
Purchase of treasury stock						(805)
Share-based compensation expense	3,462			3,462
Common stockholders' equity	594,393	187,149		420,876	(1,425)	(12,207)
Income tax expense	7,879
Net income	34,767	34,767
Common shares issued under compensation plan for Boards of Directors	377			17		360
Common shares issued under employee stock purchase plan	416			(24)		440
Common shares issued under dividend reinvestment plan	799			799
Stock Issued During Period, Value, Treasury Stock Reissued	59					59			$ 0	$ (2,729)	$ 2,729
Other comprehensive income, net of tax	2,761				2,761
Repurchase of common shares in connection with employee incentive and director compensation plans	1,128					1,128
Dividends, Common Stock, Cash	27,516	27,516
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,637
Other comprehensive income, net of tax	2,761
Other comprehensive income, net of tax	0
Purchase of treasury stock						(29,281)
Share-based compensation expense	3,556			3,556
Stock Issued During Period, Value, Conversion of Units	179			41		138
Deferred Revenue	5,224
Common stockholders' equity	$ 575,673	$ 190,691		$ 422,536	$ 1,336	$ (38,890)