PARENT COMPANY ONLY FINANCIAL STATEMENTS - Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating income:
Security gains	$ 894	$ 493	$ 522	$ 661	$ 490	$ 2,145	$ 487	$ 393
NET INCOME	$ 3,746	$ 3,364	$ 3,433	$ 3,355	$ 2,883	$ 4,793	$ 3,463	$ 3,469	$ 13,898	$ 14,608	$ 14,084
Comprehensive income									11,766	17,835	3,833
Penns Woods Bancorp, Inc
Operating income:
Dividends from subsidiaries									11,367	10,080	14,836
Security gains									0	3	0
Equity in undistributed earnings of subsidiaries									3,167	5,261	346
Operating expenses									(636)	(736)	(1,098)
NET INCOME									13,898	14,608	14,084
Comprehensive income									$ 11,766	$ 17,835	$ 3,833