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Loans - Summary of Loan Portfolio by Credit Quality Classification and Origination Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	$ 476,462	$ 727,253
Origination year - 1 year before current fiscal year	676,364	530,830
Origination year - 2 years prior to current fiscal year	409,278	315,892
Origination year - 3 years prior to current fiscal year	262,418	231,274
Origination year - 4 years prior to current fiscal year	197,040	111,786
Prior	232,425	224,304
Revolving Loans	317,173	281,624
Revolving Loans Converted to Term Loans	10,478	7,787
Total	2,581,638	2,430,750
Current period gross charge-offs
2023	3
2022	34
2021	3
2020	130
2019	7
Prior	45
Revolving Loans	249
Revolving Loans Converted to Term Loans	0
Total	471	1,398	$ 2,305
One- to four-family first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	94,614	107,968
Origination year - 1 year before current fiscal year	107,079	78,989
Origination year - 2 years prior to current fiscal year	72,899	38,244
Origination year - 3 years prior to current fiscal year	33,894	34,259
Origination year - 4 years prior to current fiscal year	27,737	26,827
Prior	93,661	97,094
Revolving Loans	3,059	5,387
Revolving Loans Converted to Term Loans	458	848
Total	433,401	389,616
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	12
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	12	80	176
Home equity loans and lines
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	1,864	1,898
Origination year - 1 year before current fiscal year	1,652	1,453
Origination year - 2 years prior to current fiscal year	1,231	783
Origination year - 3 years prior to current fiscal year	760	1,142
Origination year - 4 years prior to current fiscal year	1,117	604
Prior	3,288	3,486
Revolving Loans	57,797	51,502
Revolving Loans Converted to Term Loans	1,268	995
Total	68,977	61,863
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0	6
Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	161,755	292,991
Origination year - 1 year before current fiscal year	292,510	279,576
Origination year - 2 years prior to current fiscal year	253,550	211,495
Origination year - 3 years prior to current fiscal year	187,587	164,748
Origination year - 4 years prior to current fiscal year	142,644	64,848
Prior	109,565	102,375
Revolving Loans	44,225	35,918
Revolving Loans Converted to Term Loans	855	586
Total	1,192,691	1,152,537
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	29
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	29	270	1,337
Construction and land
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	122,318	171,161
Origination year - 1 year before current fiscal year	151,440	101,841
Origination year - 2 years prior to current fiscal year	38,410	19,772
Origination year - 3 years prior to current fiscal year	6,787	8,912
Origination year - 4 years prior to current fiscal year	7,672	2,534
Prior	4,611	2,794
Revolving Loans	9,486	4,434
Revolving Loans Converted to Term Loans	0	1,727
Total	340,724	313,175
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0	0
Multi-family residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	14,907	33,822
Origination year - 1 year before current fiscal year	37,228	15,775
Origination year - 2 years prior to current fiscal year	11,843	25,661
Origination year - 3 years prior to current fiscal year	21,558	13,070
Origination year - 4 years prior to current fiscal year	12,548	5,627
Prior	6,716	2,491
Revolving Loans	2,463	1,302
Revolving Loans Converted to Term Loans	0	2,840
Total	107,263	100,588
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term Loans	0
Total	0	0	0
Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	75,063	109,392
Origination year - 1 year before current fiscal year	80,708	50,850
Origination year - 2 years prior to current fiscal year	30,466	18,360
Origination year - 3 years prior to current fiscal year	10,945	8,607
Origination year - 4 years prior to current fiscal year	4,956	11,210
Prior	3,624	3,052
Revolving Loans	192,075	175,661
Revolving Loans Converted to Term Loans	7,822	762
Total	405,659	377,894
Current period gross charge-offs
2023	0
2022	0
2021	0
2020	124
2019	7
Prior	0
Revolving Loans	124
Revolving Loans Converted to Term Loans	0
Total	255	792	599
Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	5,941	10,021
Origination year - 1 year before current fiscal year	5,747	2,346
Origination year - 2 years prior to current fiscal year	879	1,577
Origination year - 3 years prior to current fiscal year	887	536
Origination year - 4 years prior to current fiscal year	366	136
Prior	10,960	13,012
Revolving Loans	8,068	7,420
Revolving Loans Converted to Term Loans	75	29
Total	32,923	35,077
Current period gross charge-offs
2023	3
2022	34
2021	3
2020	6
2019	0
Prior	4
Revolving Loans	125
Revolving Loans Converted to Term Loans	0
Total	175	256	$ 187
Pass
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	473,995	725,380
Origination year - 1 year before current fiscal year	674,078	529,588
Origination year - 2 years prior to current fiscal year	402,308	312,543
Origination year - 3 years prior to current fiscal year	259,043	225,542
Origination year - 4 years prior to current fiscal year	191,481	107,727
Prior	221,241	214,016
Revolving Loans	312,968	280,108
Revolving Loans Converted to Term Loans	10,428	7,237
Total	2,545,542	2,402,141
Pass | One- to four-family first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	94,465	107,546
Origination year - 1 year before current fiscal year	106,417	78,744
Origination year - 2 years prior to current fiscal year	72,594	37,876
Origination year - 3 years prior to current fiscal year	33,588	34,114
Origination year - 4 years prior to current fiscal year	27,677	26,455
Prior	91,706	94,729
Revolving Loans	3,059	5,387
Revolving Loans Converted to Term Loans	458	348
Total	429,964	385,199
Pass | Home equity loans and lines
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	1,864	1,898
Origination year - 1 year before current fiscal year	1,652	1,453
Origination year - 2 years prior to current fiscal year	1,231	783
Origination year - 3 years prior to current fiscal year	760	1,142
Origination year - 4 years prior to current fiscal year	1,117	604
Prior	3,138	3,453
Revolving Loans	57,768	51,502
Revolving Loans Converted to Term Loans	1,240	995
Total	68,770	61,830
Pass | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	161,755	292,894
Origination year - 1 year before current fiscal year	292,494	279,397
Origination year - 2 years prior to current fiscal year	252,109	210,983
Origination year - 3 years prior to current fiscal year	184,935	159,169
Origination year - 4 years prior to current fiscal year	137,154	64,554
Prior	104,533	95,083
Revolving Loans	44,225	35,918
Revolving Loans Converted to Term Loans	855	586
Total	1,178,060	1,138,584
Pass | Construction and land
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	121,389	170,744
Origination year - 1 year before current fiscal year	150,667	101,321
Origination year - 2 years prior to current fiscal year	33,247	19,620
Origination year - 3 years prior to current fiscal year	6,641	8,912
Origination year - 4 years prior to current fiscal year	7,672	2,534
Prior	4,567	2,716
Revolving Loans	5,439	4,434
Revolving Loans Converted to Term Loans	0	1,727
Total	329,622	312,008
Pass | Multi-family residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	14,907	33,822
Origination year - 1 year before current fiscal year	37,228	15,775
Origination year - 2 years prior to current fiscal year	11,843	25,661
Origination year - 3 years prior to current fiscal year	21,558	13,070
Origination year - 4 years prior to current fiscal year	12,548	2,241
Prior	3,213	2,491
Revolving Loans	2,463	1,302
Revolving Loans Converted to Term Loans	0	2,840
Total	103,760	97,202
Pass | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	73,674	108,464
Origination year - 1 year before current fiscal year	79,886	50,850
Origination year - 2 years prior to current fiscal year	30,412	16,043
Origination year - 3 years prior to current fiscal year	10,674	8,599
Origination year - 4 years prior to current fiscal year	4,954	11,203
Prior	3,386	2,759
Revolving Loans	191,946	174,145
Revolving Loans Converted to Term Loans	7,800	712
Total	402,732	372,775
Pass | Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	5,941	10,012
Origination year - 1 year before current fiscal year	5,734	2,048
Origination year - 2 years prior to current fiscal year	872	1,577
Origination year - 3 years prior to current fiscal year	887	536
Origination year - 4 years prior to current fiscal year	359	136
Prior	10,698	12,785
Revolving Loans	8,068	7,420
Revolving Loans Converted to Term Loans	75	29
Total	32,634	34,543
Special Mention
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	1,078	488
Origination year - 1 year before current fiscal year	1,445	888
Origination year - 2 years prior to current fiscal year	4,823	345
Origination year - 3 years prior to current fiscal year	410	0
Origination year - 4 years prior to current fiscal year	0	3,319
Prior	172	355
Revolving Loans	0	1,188
Revolving Loans Converted to Term Loans	0	500
Total	7,928	7,083
Special Mention | One- to four-family first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	149	150
Origination year - 1 year before current fiscal year	497	189
Origination year - 2 years prior to current fiscal year	188	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	34	355
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	500
Total	868	1,194
Special Mention | Home equity loans and lines
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Special Mention | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	179
Origination year - 2 years prior to current fiscal year	0	345
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	524
Special Mention | Construction and land
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	929	0
Origination year - 1 year before current fiscal year	164	520
Origination year - 2 years prior to current fiscal year	4,635	0
Origination year - 3 years prior to current fiscal year	146	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	5,874	520
Special Mention | Multi-family residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	3,312
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	3,312
Special Mention | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	338
Origination year - 1 year before current fiscal year	784	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	264	0
Origination year - 4 years prior to current fiscal year	0	7
Prior	138	0
Revolving Loans	0	1,188
Revolving Loans Converted to Term Loans	0	0
Total	1,186	1,533
Special Mention | Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Substandard
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	1,389	1,385
Origination year - 1 year before current fiscal year	841	354
Origination year - 2 years prior to current fiscal year	2,147	3,004
Origination year - 3 years prior to current fiscal year	2,965	5,732
Origination year - 4 years prior to current fiscal year	5,559	740
Prior	11,012	9,933
Revolving Loans	4,205	328
Revolving Loans Converted to Term Loans	50	50
Total	28,168	21,526
Substandard | One- to four-family first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	272
Origination year - 1 year before current fiscal year	165	56
Origination year - 2 years prior to current fiscal year	117	368
Origination year - 3 years prior to current fiscal year	306	145
Origination year - 4 years prior to current fiscal year	60	372
Prior	1,921	2,010
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	2,569	3,223
Substandard | Home equity loans and lines
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	150	33
Revolving Loans	29	0
Revolving Loans Converted to Term Loans	28	0
Total	207	33
Substandard | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	97
Origination year - 1 year before current fiscal year	16	0
Origination year - 2 years prior to current fiscal year	1,441	167
Origination year - 3 years prior to current fiscal year	2,652	5,579
Origination year - 4 years prior to current fiscal year	5,490	294
Prior	5,032	7,292
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	14,631	13,429
Substandard | Construction and land
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	417
Origination year - 1 year before current fiscal year	609	0
Origination year - 2 years prior to current fiscal year	528	152
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	44	78
Revolving Loans	4,047	0
Revolving Loans Converted to Term Loans	0	0
Total	5,228	647
Substandard | Multi-family residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	74
Prior	3,503	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	3,503	74
Substandard | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	1,389	590
Origination year - 1 year before current fiscal year	38	0
Origination year - 2 years prior to current fiscal year	54	2,317
Origination year - 3 years prior to current fiscal year	7	8
Origination year - 4 years prior to current fiscal year	2	0
Prior	100	293
Revolving Loans	129	328
Revolving Loans Converted to Term Loans	22	50
Total	1,741	3,586
Substandard | Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	9
Origination year - 1 year before current fiscal year	13	298
Origination year - 2 years prior to current fiscal year	7	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	7	0
Prior	262	227
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	289	534
Doubtful
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | One- to four-family first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Home equity loans and lines
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Construction and land
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Multi-family residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Doubtful | Consumer
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Origination year - current fiscal year	0	0
Origination year - 1 year before current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	$ 0	$ 0

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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