Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income attributable to Pathfinder Bancorp, Inc.	$ 2,416	$ 2,934
Adjustments to reconcile net income to net cash flows from operating activities:
Provision for loan losses	1,354	1,201
Amortization of operating leases	21	0
Proceeds from sales of loans	912	216
Originations of loans held-for-sale	(903)	(212)
Realized (gains) losses on sales, redemptions and calls of:
Real estate acquired through foreclosure	(24)	(22)
Loans	(19)	(2)
Available-for-sale investment securities	(246)	177
Held-to-maturity investment securities	14	12
Premises and equipment	0	(8)
Marketable equity securities	(61)	(26)
Depreciation	1,133	869
Amortization of mortgage servicing rights	(2)	3
Amortization of deferred loan costs	194	240
Amortization of deferred financing from subordinated debt	25	26
Earnings and gain on bank owned life insurance	(355)	(319)
Net amortization of premiums and discounts on investment securities	861	1,339
Amortization of intangible assets	12	13
Stock based compensation and ESOP expense	478	544
Net change in accrued interest receivable	(245)	132
Pension plan contribution	0	(825)
Net change in other assets and liabilities	990	(309)
Net cash flows from operating activities	6,555	5,983
INVESTING ACTIVITIES
Purchase of investment securities available-for-sale	(50,479)	(55,284)
Purchase of investment securities held-to-maturity	(72,346)	0
Purchase of Federal Home Loan Bank stock	(6,125)	(6,439)
Proceeds from redemption of Federal Home Loan Bank stock	7,852	6,107
Proceeds from maturities and principal reductions of investment securities available-for-sale	24,935	33,650
Proceeds from maturities and principal reductions of investment securities held-to-maturity	11,273	5,238
Proceeds from sales, redemptions and calls of:
Available-for-sale investment securities	86,555	33,421
Held-to-maturity investment securities	549	953
Real estate acquired through foreclosure	1,552	542
Premise and equipment	0	14
Purchase of bank owned life insurance	0	(5,000)
Proceeds from bank owned life insurance	0	228
Net change in loans	(106,657)	(41,111)
Purchase of premises and equipment	(2,921)	(2,176)
Net cash flows from investing activities	(105,812)	(29,857)
FINANCING ACTIVITIES
Net change in demand deposits, NOW accounts, savings accounts, money management deposit accounts, MMDA accounts and escrow deposits	17,133	(19,633)
Net change in time deposits	49,401	43,260
Net change in brokered deposits	66,015	8,974
Net change in short-term borrowings	(20,762)	(28,600)
Payments on long-term borrowings	(26,200)	(2,000)
Proceeds from long-term borrowings	7,680	36,348
Proceeds from exercise of stock options	200	362
Cash dividends paid to common shareholders	(808)	(764)
Cash dividends paid to preferred shareholders	(69)	0
Cash dividends paid on warrants	(8)	0
Proceeds from finance lease transaction	572	0
Change in noncontrolling interest, net	(9)	(90)
Net cash flows from financing activities	112,714	37,857
Change in cash and cash equivalents	13,457	13,983
Cash and cash equivalents at beginning of period	26,316	21,991
Cash and cash equivalents at end of period	39,773	35,974
CASH PAID DURING THE PERIOD FOR:
Interest	9,888	6,159
Income taxes	300	662
NON-CASH INVESTING ACTIVITY
Real estate acquired in exchange for loans	503	320
RESTRICTED CASH
Federal Reserve Bank Reserve Requirements included in interest earning deposits	0	4,478
Common Stock [Member]
FINANCING ACTIVITIES
Net proceeds from private placement	4,199	0
Preferred Stock [Member]
FINANCING ACTIVITIES
Net proceeds from private placement	$ 15,370	$ 0