CONSOLIDATED STATEMENT OF INCOME - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INTEREST AND DIVIDEND INCOME:
Loans, including fees	$ 60,384,000	$ 54,000,000	$ 45,833,000
Investment securities:
Taxable	3,997,000	2,784,000	2,182,000
Tax-exempt	660,000	860,000	1,218,000
Dividend and other interest income	1,733,000	1,102,000	744,000
TOTAL INTEREST AND DIVIDEND INCOME	66,774,000	58,746,000	49,977,000
INTEREST EXPENSE:
Deposits	11,443,000	6,370,000	4,083,000
Short-term borrowings	793,000	1,757,000	234,000
Long-term borrowings	3,723,000	2,809,000	1,580,000
TOTAL INTEREST EXPENSE	15,959,000	10,936,000	5,897,000
NET INTEREST INCOME	50,815,000	47,810,000	44,080,000
PROVISION FOR LOAN LOSSES	2,735,000	1,735,000	730,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	48,080,000	46,075,000	43,350,000
NON-INTEREST INCOME:
Service charges, insurance commissions, brokerage commissions, and debit card fees	1,378,000	1,534,000	1,312,000
Net debt securities gains (losses), available for sale	640,000	(47,000)	600,000
Net equity securities gains (losses)	89,000	(170,000)	0
Net securities gains (losses), trading	19,000	3,000	(8,000)
Bank-owned life insurance	574,000	662,000	666,000
Gain on sale of loans	1,754,000	1,518,000	1,674,000
Other	1,796,000	1,800,000	1,756,000
TOTAL NON-INTEREST INCOME	10,452,000	9,461,000	10,744,000
NON-INTEREST EXPENSE:
Salaries and employee benefits	21,829,000	21,083,000	18,999,000
Occupancy	2,712,000	2,702,000	2,447,000
Furniture and equipment	3,248,000	3,092,000	2,915,000
Software amortization	871,000	712,000	974,000
Pennsylvania shares tax	1,148,000	1,108,000	925,000
Professional Fees	2,474,000	2,106,000	2,353,000
Federal Deposit Insurance Corporation deposit insurance	578,000	890,000	669,000
Write down of assets held for sale	475,000	0	0
Loss on sale of premises and equipment	474,000	0	0
Marketing	425,000	767,000	958,000
Intangible amortization	264,000	300,000	337,000
Other	5,210,000	5,247,000	6,285,000
TOTAL NON-INTEREST EXPENSE	39,708,000	38,007,000	36,862,000
INCOME BEFORE INCOME TAX PROVISION	18,824,000	17,529,000	17,232,000
INCOME TAX PROVISION	3,138,000	2,819,000	7,459,000
CONSOLIDATED NET INCOME	15,686,000	14,710,000	9,773,000
Earnings attributable to noncontrolling interest	14,000	6,000	0
NET INCOME ATTRIBUTABLE TO PENNS WOODS BANCORP, INC.	$ 15,672,000	$ 14,704,000	$ 9,773,000
EARNINGS PER SHARE - BASIC (in dollars per share)	$ 2.23	$ 2.09	$ 1.39
EARNINGS PER SHARE - DILUTED (in dollars per share)	$ 2.20	$ 2.09	$ 1.39
Weighted Average Number of Shares Outstanding, Basic	7,038,714	7,035,381	7,058,403
WEIGHTED AVERAGE SHARES OUTSTANDING - DILUTED (in shares)	7,113,339	7,035,381	7,058,403
DIVIDENDS PER SHARE (in dollars per share)	$ 1.26	$ 1.25	$ 1.25
Deposit Account
NON-INTEREST INCOME:
Service charges, insurance commissions, brokerage commissions, and debit card fees	$ 2,411,000	$ 2,460,000	$ 2,222,000
Insurance Commissions
NON-INTEREST INCOME:
Service charges, insurance commissions, brokerage commissions, and debit card fees	433,000	365,000	496,000
Brokerage Commissions
NON-INTEREST INCOME:
Service charges, insurance commissions, brokerage commissions, and debit card fees	1,358,000	1,336,000	1,378,000
Debit Card
NON-INTEREST INCOME:
Service charges, insurance commissions, brokerage commissions, and debit card fees	$ 1,378,000	$ 1,534,000	$ 1,960,000