SEGMENT INFORMATION - Segment income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
INTEREST INCOME
Total interest income	$ 4,073	$ 3,779	$ 11,867	$ 10,811
INTEREST EXPENSE
Total interest expense	1,430	1,553	4,172	4,226
Net interest income	2,643	2,226	7,695	6,585
Provision for credit losses available-for-sale securities	0	0	148
Provision for credit losses loans receivable	100	80	192	701
Net interest income after provision for credit losses	2,543	2,146	7,355	5,884
NONINTEREST INCOME
Gain on sale of fixed assets			6
Earnings on deferred compensation plan assets	35	26	103	78
Net (losses) gains on sale of residential mortgage loans	(1)	63	48	128
Total noninterest income	630	595	1,860	1,612
NONINTEREST EXPENSE
Compensation and employee benefits	1,328	1,248	4,198	3,686
Core processing	505	435	1,447	1,146
Premises and equipment	269	211	828	644
Impairment of long-lived assets	262		262
Professional fees	122	77	525	240
Postage and office supplies	22	23	69	80
FDIC premiums	58	38	172	105
Advertising	58	72	213	251
Director fees	49	38	149	122
Other	171	173	566	496
Total noninterest expense	2,844	2,315	8,429	6,770
Income (loss) before provision for income taxes from continuing operations	67	173	1	(7)
PROVISION FOR INCOME TAXES	40	39	33	33
Net income	86	185	129	137
Service fees
NONINTEREST INCOME
Non-interest income	37	33	111	98
Operating Segments
INTEREST INCOME
Total interest income	4,073	3,779	11,867	10,811
INTEREST EXPENSE
Total interest expense	1,430	1,553	4,172	4,226
Net interest income	2,643	2,226	7,695	6,585
Provision for credit losses available-for-sale securities			148
Provision for credit losses loans receivable	100	80	192	701
Net interest income after provision for credit losses	2,543	2,146	7,355	5,884
NONINTEREST INCOME
Gain on sale of fixed assets			6
Earnings on deferred compensation plan assets	35	26	103	78
Net (losses) gains on sale of residential mortgage loans	(1)	63	48	128
Total noninterest income	630	595	1,860	1,612
NONINTEREST EXPENSE
Compensation and employee benefits	1,471	1,365	4,621	4,038
Core processing	505	435	1,447	1,146
Premises and equipment	275	217	846	662
Impairment of long-lived assets	262		262
Professional fees	122	102	545	265
Postage and office supplies	22	23	71	81
FDIC premiums	58	38	172	105
Advertising	58	74	214	257
Director fees	49	38	150	123
Intangible asset amortization	39	38	117	117
Other	186	187	608	532
Total noninterest expense	3,047	2,517	9,053	7,326
Income (loss) before provision for income taxes from continuing operations	126	224	162	170
PROVISION FOR INCOME TAXES	40	39	33	33
Net income	86	185	129	137
Operating Segments | Service fees
NONINTEREST INCOME
Non-interest income	37	33	111	98
Operating Segments | Income from financial services
NONINTEREST INCOME
Non-interest income	254	245	761	709
Operating Segments | Fee income
NONINTEREST INCOME
Non-interest income	305	228	831	599
Operating Segments | Seneca Savings
INTEREST INCOME
Total interest income	4,073	3,779	11,867	10,811
INTEREST EXPENSE
Total interest expense	1,430	1,553	4,172	4,226
Net interest income	2,643	2,226	7,695	6,585
Provision for credit losses available-for-sale securities			148
Provision for credit losses loans receivable	100	80	192	701
Net interest income after provision for credit losses	2,543	2,146	7,355	5,884
NONINTEREST INCOME
Gain on sale of fixed assets			6
Earnings on deferred compensation plan assets	35	26	103	78
Net (losses) gains on sale of residential mortgage loans	(1)	63	48	128
Total noninterest income	368	342	1,075	879
NONINTEREST EXPENSE
Compensation and employee benefits	1,328	1,248	4,198	3,686
Core processing	505	435	1,447	1,146
Premises and equipment	269	211	828	644
Impairment of long-lived assets	262		262
Professional fees	122	77	525	240
Postage and office supplies	22	23	70	80
FDIC premiums	58	38	172	105
Advertising	58	72	212	251
Director fees	49	38	149	122
Other	171	173	566	496
Total noninterest expense	2,844	2,315	8,429	6,770
Income (loss) before provision for income taxes from continuing operations	67	173	1	(7)
PROVISION FOR INCOME TAXES	40	39	33	33
Net income	27	134	(32)	(40)
Operating Segments | Seneca Savings | Service fees
NONINTEREST INCOME
Non-interest income	37	33	111	98
Operating Segments | Seneca Savings | Fee income
NONINTEREST INCOME
Non-interest income	297	220	807	575
Operating Segments | Financial Quest
NONINTEREST INCOME
Total noninterest income	262	253	785	733
NONINTEREST EXPENSE
Compensation and employee benefits	143	117	423	352
Premises and equipment	6	6	18	18
Professional fees		25	20	25
Postage and office supplies			1	1
Advertising		2	2	6
Director fees			1	1
Intangible asset amortization	39	38	117	117
Other	15	14	42	36
Total noninterest expense	203	202	624	556
Income (loss) before provision for income taxes from continuing operations	59	51	161	177
Net income	59	51	161	177
Operating Segments | Financial Quest | Income from financial services
NONINTEREST INCOME
Non-interest income	254	245	761	709
Operating Segments | Financial Quest | Fee income
NONINTEREST INCOME
Non-interest income	$ 8	$ 8	$ 24	$ 24