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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 131,165	$ 129,257	$ 127,155	$ 123,073
Recorded Investment of Loans	13,020,468	12,853,678
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	130,665	128,740
Recorded Investment of Loans	$ 11,833,633	$ 11,597,492
Ratio	1.10%	1.10%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 500	$ 517
Recorded Investment of Loans	$ 48,525	$ 60,680
Ratio	1.00%	0.90%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 31,484	$ 33,033	35,928	36,892
Recorded Investment of Loans	5,844,963	5,798,966
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	31,484	33,033
Recorded Investment of Loans	$ 5,833,667	$ 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	$ 16,259	$ 21,345
Ratio	0.00%	0.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 31,463	$ 31,317	25,214	24,556
Recorded Investment of Loans	1,841,674	1,890,668
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	31,463	31,317
Recorded Investment of Loans	$ 1,045,849	$ 1,060,428
Ratio	3.00%	3.00%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 1,380	$ 2,427
Ratio	0.00%	0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,926	$ 1,842	2,052	1,944
Recorded Investment of Loans	607,071	624,479
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,926	1,842
Recorded Investment of Loans	$ 299,622	$ 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	$ 0	$ 0
Ratio	0.00%	0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 9,156	$ 7,978	7,355	6,829
Recorded Investment of Loans	181,323	155,204
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	9,147	7,969
Recorded Investment of Loans	$ 145,197	$ 122,639
Ratio	6.30%	6.50%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 9	$ 9
Recorded Investment of Loans	$ 438	$ 920
Ratio	2.10%	1.00%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,144	$ 2,164	2,906	2,649
Recorded Investment of Loans	100,563	102,036
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,144	2,164
Recorded Investment of Loans	$ 95,628	$ 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	$ 303	$ 507
Ratio	0.00%	0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 7,884	$ 8,329	7,904	7,862
Recorded Investment of Loans	1,405,172	1,385,125
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	7,880	8,325
Recorded Investment of Loans	$ 1,404,714	$ 1,384,655
Ratio	0.60%	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	$ 435	$ 448
Ratio	0.90%	1.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 12,711	$ 11,852	11,625	11,818
Recorded Investment of Loans	1,526,887	1,452,168
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	12,569	11,702
Recorded Investment of Loans	$ 1,512,064	$ 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	$ 142	$ 150
Recorded Investment of Loans	$ 14,823	$ 19,378
Ratio	1.00%	0.80%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 30,279	$ 28,702	29,268	28,524
Recorded Investment of Loans	1,213,738	1,140,874
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	29,934	28,348
Recorded Investment of Loans	$ 1,199,565	$ 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	$ 345	$ 354
Recorded Investment of Loans	$ 14,206	$ 14,437
Ratio	2.40%	2.50%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,064	$ 781	808	855
Recorded Investment of Loans	136,856	130,852
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,064	781
Recorded Investment of Loans	$ 135,369	$ 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	$ 519	$ 1,162
Ratio	0.00%	0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 3,054	$ 3,259	$ 4,095	$ 1,144
Recorded Investment of Loans	162,221	173,306
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	3,054	3,259
Recorded Investment of Loans	$ 161,958	$ 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	$ 162	$ 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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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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Allowance as a Percentage of Outstanding Loans and Leases

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