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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 176,811	$ 199,545
Unpaid Principal Balance	190,921	214,712
Related Allowance	2,578	3,388
Average Recorded Investment (Year-To-Date)	187,998	228,398
Amount of related allowance included in specific reserves	376	517
Amount of related allowance included in general reserves	2,202	2,871
Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	36,212	42,687
Unpaid Principal Balance	42,441	49,425
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	38,947	43,292
Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	140,599	156,858
Unpaid Principal Balance	148,480	165,287
Related Allowance	2,578	3,388
Average Recorded Investment (Year-To-Date)	149,051	185,106
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	142,354	158,668
Unpaid Principal Balance	146,007	163,149
Related Allowance	2,202	2,871
Average Recorded Investment (Year-To-Date)	150,090	181,826
Single-family residential | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	16,089	18,872
Unpaid Principal Balance	16,964	20,050
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	16,800	20,097
Single-family residential | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	126,265	139,796
Unpaid Principal Balance	129,043	143,099
Related Allowance	2,202	2,871
Average Recorded Investment (Year-To-Date)	133,290	161,729
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,532	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,953	1,349
Construction | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,532	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,953	1,349
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Construction - custom | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	242	921
Unpaid Principal Balance	297	971
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	534	611
Land - acquisition & development | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	143	814
Unpaid Principal Balance	143	814
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	431	572
Land - acquisition & development | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	99	107
Unpaid Principal Balance	154	157
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	103	39
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,624	5,227
Unpaid Principal Balance	5,111	5,626
Related Allowance	7	9
Average Recorded Investment (Year-To-Date)	4,878	6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	135	311
Unpaid Principal Balance	165	336
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	209	260
Land - consumer lot loans | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,489	4,916
Unpaid Principal Balance	4,946	5,290
Related Allowance	7	9
Average Recorded Investment (Year-To-Date)	4,669	6,449
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	419	448
Unpaid Principal Balance	419	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	434	541
Multi-family | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		70
Multi-family | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	419	448
Unpaid Principal Balance	419	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	434	471
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,699	15,679
Unpaid Principal Balance	19,533	21,768
Related Allowance	120	150
Average Recorded Investment (Year-To-Date)	14,959	21,603
Commercial real estate | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,757	9,425
Unpaid Principal Balance	13,482	14,035
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,376	11,158
Commercial real estate | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,942	6,254
Unpaid Principal Balance	6,051	7,733
Related Allowance	120	150
Average Recorded Investment (Year-To-Date)	5,583	10,445
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,366	14,428
Unpaid Principal Balance	16,151	17,652
Related Allowance	245	354
Average Recorded Investment (Year-To-Date)	13,607	13,703
Commercial & industrial | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,006	10,137
Unpaid Principal Balance	9,321	10,146
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,670	9,208
Commercial & industrial | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,360	4,291
Unpaid Principal Balance	6,830	7,506
Related Allowance	245	354
Average Recorded Investment (Year-To-Date)	3,937	4,495
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,488	1,386
Unpaid Principal Balance	1,500	2,154
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,454	1,845
HELOC | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	528	410
Unpaid Principal Balance	528	1,170
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	486	450
HELOC | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	960	976
Unpaid Principal Balance	972	984
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	968	1,395
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	87	90
Unpaid Principal Balance	153	126
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	89	137
Consumer | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	22	20
Unpaid Principal Balance	88	56
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	22	54
Consumer | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	65	70
Unpaid Principal Balance	65	70
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 67	$ 83

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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