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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 134,022	$ 133,086	$ 129,257	$ 128,666	$ 127,576	$ 123,073
Recorded Investment of Loans	13,304,743		12,853,678
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	133,691		128,740
Recorded Investment of Loans	$ 12,115,429		$ 11,597,492
Ratio	1.10%		1.10%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 331		$ 517
Recorded Investment of Loans	$ 40,438		$ 60,680
Ratio	0.80%		0.90%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 31,514	31,476	$ 33,033	34,401	34,144	36,892
Recorded Investment of Loans	5,873,583		5,798,966
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	31,514		33,033
Recorded Investment of Loans	$ 5,861,596		$ 5,782,870
Ratio	0.50%		0.60%
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 16,107		$ 21,345
Ratio	0.00%		0.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 34,057	33,396	$ 31,317	30,133	27,389	24,556
Recorded Investment of Loans	1,997,236		1,890,668
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	34,057		31,317
Recorded Investment of Loans	$ 1,168,667		$ 1,060,428
Ratio	2.90%		3.00%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 0		$ 2,427
Ratio	0.00%		0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,884	1,976	$ 1,842	2,014	2,081	1,944
Recorded Investment of Loans	570,897		624,479
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,884		1,842
Recorded Investment of Loans	$ 293,063		$ 289,192
Ratio	0.60%		0.60%
Construction - custom | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 1,161		$ 0
Ratio	0.00%		0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 9,388	9,734	$ 7,978	7,700	7,622	6,829
Recorded Investment of Loans	203,086		155,204
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	9,371		7,969
Recorded Investment of Loans	$ 160,210		$ 122,639
Ratio	5.80%		6.50%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 17		$ 9
Recorded Investment of Loans	$ 173		$ 920
Ratio	9.80%		1.00%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,032	2,076	$ 2,164	2,907	2,853	2,649
Recorded Investment of Loans	95,227		102,036
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,032		2,164
Recorded Investment of Loans	$ 90,629		$ 96,583
Ratio	2.20%		2.20%
Land - consumer lot loans | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 582		$ 507
Ratio	0.00%		0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 7,283	7,394	$ 8,329	8,091	7,982	7,862
Recorded Investment of Loans	1,403,142		1,385,125
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	7,279		8,325
Recorded Investment of Loans	$ 1,401,288		$ 1,384,655
Ratio	0.50%		0.60%
Multi-family | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 4		$ 4
Recorded Investment of Loans	$ 1,832		$ 448
Ratio	0.20%		1.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 13,004	12,448	$ 11,852	11,579	11,588	11,818
Recorded Investment of Loans	1,622,943		1,452,168
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	12,772		11,702
Recorded Investment of Loans	$ 1,609,208		$ 1,432,791
Ratio	0.80%		0.80%
Commercial real estate | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 232		$ 150
Recorded Investment of Loans	$ 13,736		$ 19,378
Ratio	1.70%		0.80%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 31,071	30,574	$ 28,702	27,515	29,330	28,524
Recorded Investment of Loans	1,256,398		1,140,874
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	30,993		28,348
Recorded Investment of Loans	$ 1,250,289		$ 1,126,438
Ratio	2.50%		2.50%
Commercial & industrial | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 78		$ 354
Recorded Investment of Loans	$ 6,155		$ 14,437
Ratio	1.30%		2.50%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,087	1,082	$ 781	811	802	855
Recorded Investment of Loans	139,914		130,852
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,087		781
Recorded Investment of Loans	$ 138,269		$ 128,715
Ratio	0.80%		0.60%
HELOC | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 692		$ 1,162
Ratio	0.00%		0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,702	$ 2,930	$ 3,259	$ 3,515	$ 3,785	$ 1,144
Recorded Investment of Loans	142,317		173,306
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,702		3,259
Recorded Investment of Loans	$ 142,210		$ 173,181
Ratio	1.90%		1.90%
Consumer | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0		$ 0
Recorded Investment of Loans	$ 0		$ 56
Ratio	0.00%		0.00%

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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-Publisher FASB
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Allowance as a Percentage of Outstanding Loans and Leases

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