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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 162,395	$ 199,545
Unpaid Principal Balance	178,085	214,712
Related Allowance	2,496	3,388
Average Recorded Investment (Year-To-Date)	181,598	228,398
Amount of related allowance included in specific reserves	331	517
Amount of related allowance included in general reserves	2,165	2,871
Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	33,538	42,687
Unpaid Principal Balance	44,714	49,425
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	37,595	43,292
Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	128,857	156,858
Unpaid Principal Balance	133,371	165,287
Related Allowance	2,496	3,388
Average Recorded Investment (Year-To-Date)	144,003	185,106
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	133,012	158,668
Unpaid Principal Balance	137,125	163,149
Related Allowance	2,165	2,871
Average Recorded Investment (Year-To-Date)	145,820	181,826
Single-family residential | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,045	18,872
Unpaid Principal Balance	16,340	20,050
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	16,361	20,097
Single-family residential | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	117,967	139,796
Unpaid Principal Balance	120,785	143,099
Related Allowance	2,165	2,871
Average Recorded Investment (Year-To-Date)	129,459	161,729
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	2,698
Unpaid Principal Balance	0	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,465	1,349
Construction | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	2,698
Unpaid Principal Balance	0	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,465	1,349
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,257	0
Unpaid Principal Balance	1,257	0
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	314	74
Construction - custom | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,257	0
Unpaid Principal Balance	1,257	0
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	314	74
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	173	921
Unpaid Principal Balance	296	971
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	444	611
Land - acquisition & development | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	78	814
Unpaid Principal Balance	143	814
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	343	572
Land - acquisition & development | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	95	107
Unpaid Principal Balance	153	157
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	101	39
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,522	5,227
Unpaid Principal Balance	4,971	5,626
Related Allowance	17	9
Average Recorded Investment (Year-To-Date)	4,789	6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	466	311
Unpaid Principal Balance	499	336
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	273	260
Land - consumer lot loans | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,056	4,916
Unpaid Principal Balance	4,472	5,290
Related Allowance	17	9
Average Recorded Investment (Year-To-Date)	4,516	6,449
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,833	448
Unpaid Principal Balance	1,833	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	784	541
Multi-family | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,431	0
Unpaid Principal Balance	1,431	0
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	358	70
Multi-family | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	402	448
Unpaid Principal Balance	402	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	426	471
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,736	15,679
Unpaid Principal Balance	20,322	21,768
Related Allowance	232	150
Average Recorded Investment (Year-To-Date)	14,653	21,603
Commercial real estate | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,854	9,425
Unpaid Principal Balance	14,320	14,035
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,245	11,158
Commercial real estate | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,882	6,254
Unpaid Principal Balance	6,002	7,733
Related Allowance	232	150
Average Recorded Investment (Year-To-Date)	5,408	10,445
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,155	14,428
Unpaid Principal Balance	10,433	17,652
Related Allowance	78	354
Average Recorded Investment (Year-To-Date)	11,745	13,703
Commercial & industrial | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,715	10,137
Unpaid Principal Balance	9,904	10,146
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	8,682	9,208
Commercial & industrial | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	440	4,291
Unpaid Principal Balance	529	7,506
Related Allowance	78	354
Average Recorded Investment (Year-To-Date)	3,063	4,495
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,645	1,386
Unpaid Principal Balance	1,751	2,154
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,501	1,845
HELOC | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	692	410
Unpaid Principal Balance	785	1,170
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	537	450
HELOC | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	953	976
Unpaid Principal Balance	966	984
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	964	1,395
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	62	90
Unpaid Principal Balance	97	126
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	83	137
Consumer | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	20
Unpaid Principal Balance	35	56
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	17	54
Consumer | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	62	70
Unpaid Principal Balance	62	70
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 66	$ 83

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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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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