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Allowance for Loan Losses - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 131,534	$ 129,257	$ 123,073
Recorded Investment of Loans	13,312,388	12,853,678
Single-family residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	30,988	33,033	36,892
Recorded Investment of Loans	5,835,194	5,798,966
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	32,304	31,317	24,556
Recorded Investment of Loans	2,038,052	1,890,668
Construction - custom
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	1,369	1,842	1,944
Recorded Investment of Loans	540,741	624,479
Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	9,155	7,978	6,829
Recorded Investment of Loans	204,107	155,204
Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	2,143	2,164	2,649
Recorded Investment of Loans	99,694	102,036
Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	7,391	8,329	7,862
Recorded Investment of Loans	1,422,674	1,385,125
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	13,170	11,852	11,818
Recorded Investment of Loans	1,631,170	1,452,168
Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	31,450	28,702	28,524
Recorded Investment of Loans	1,268,695	1,140,874
HELOC
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	1,103	781	855
Recorded Investment of Loans	142,178	130,852
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	2,461	3,259	$ 1,144
Recorded Investment of Loans	129,883	173,306
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	131,095	128,740
Recorded Investment of Loans	$ 12,076,622	$ 11,597,492
Ratio	1.10%	1.10%
Loans Collectively Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 30,988	$ 33,033
Recorded Investment of Loans	$ 5,822,200	$ 5,782,870
Ratio	0.50%	0.60%
Loans Collectively Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 32,304	$ 31,317
Recorded Investment of Loans	$ 1,164,889	$ 1,060,428
Ratio	2.80%	3.00%
Loans Collectively Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 1,369	$ 1,842
Recorded Investment of Loans	$ 255,505	$ 289,192
Ratio	0.50%	0.60%
Loans Collectively Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 9,135	$ 7,969
Recorded Investment of Loans	$ 160,964	$ 122,639
Ratio	5.70%	6.50%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 2,143	$ 2,164
Recorded Investment of Loans	$ 95,574	$ 96,583
Ratio	2.20%	2.20%
Loans Collectively Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 7,387	$ 8,325
Recorded Investment of Loans	$ 1,422,266	$ 1,384,655
Ratio	0.50%	0.60%
Loans Collectively Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 12,847	$ 11,702
Recorded Investment of Loans	$ 1,618,406	$ 1,432,791
Ratio	0.80%	0.80%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 31,358	$ 28,348
Recorded Investment of Loans	$ 1,266,913	$ 1,126,438
Ratio	2.50%	2.50%
Loans Collectively Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 1,103	$ 781
Recorded Investment of Loans	$ 140,378	$ 128,715
Ratio	0.80%	0.60%
Loans Collectively Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 2,461	$ 3,259
Recorded Investment of Loans	$ 129,527	$ 173,181
Ratio	1.90%	1.90%
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 439	$ 517
Recorded Investment of Loans	$ 34,425	$ 60,680
Ratio	1.30%	0.90%
Loans Individually Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 17,978	$ 21,345
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 0	$ 2,427
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 0	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 20	$ 9
Recorded Investment of Loans	$ 230	$ 920
Ratio	8.70%	1.00%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 375	$ 507
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 4	$ 4
Recorded Investment of Loans	$ 385	$ 448
Ratio	1.00%	1.00%
Loans Individually Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 323	$ 150
Recorded Investment of Loans	$ 12,765	$ 19,378
Ratio	2.50%	0.80%
Loans Individually Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 92	$ 354
Recorded Investment of Loans	$ 1,805	$ 14,437
Ratio	5.10%	2.50%
Loans Individually Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 837	$ 1,162
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance Reserve Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 50	$ 56
Ratio	0.00%	0.00%

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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- Definition

Allowance as a Percentage of Outstanding Loans and Leases

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