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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 313,924	$ 341,579
Unpaid Principal Balance	343,325	381,223
Related Allowance	6,339	6,678
Average Recorded Investment	311,146	333,815
Amount of related allowance included in specific reserves	130	275
Amount of related allowance included in general reserves	6,209	6,403
Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,811	38,866
Unpaid Principal Balance	47,865	70,564
Related Allowance	0	0
Average Recorded Investment	22,840	29,474
Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	287,113	302,713
Unpaid Principal Balance	295,460	310,659
Related Allowance	6,339	6,678
Average Recorded Investment	288,306	304,341
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	261,001	276,711
Unpaid Principal Balance	265,834	282,912
Related Allowance	6,339	6,678
Average Recorded Investment	259,759	274,097
Single-family residential | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	14,791	17,250
Unpaid Principal Balance	16,304	19,644
Related Allowance	0	0
Average Recorded Investment	12,837	14,069
Single-family residential | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	246,210	259,461
Unpaid Principal Balance	249,530	263,268
Related Allowance	6,339	6,678
Average Recorded Investment	246,922	260,028
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	5,441
Unpaid Principal Balance	0	7,929
Related Allowance	0	0
Average Recorded Investment	0	5,903
Construction | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	453
Unpaid Principal Balance	0	2,151
Related Allowance	0	0
Average Recorded Investment	0	471
Construction | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	4,988
Unpaid Principal Balance	0	5,778
Related Allowance	0	0
Average Recorded Investment	0	5,432
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,182	554
Unpaid Principal Balance	1,182	554
Related Allowance	0	0
Average Recorded Investment	868	182
Construction - custom | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,182	554
Unpaid Principal Balance	1,182	554
Related Allowance	0	0
Average Recorded Investment	868	182
Construction - custom | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,643	5,056
Unpaid Principal Balance	11,933	12,852
Related Allowance	0	0
Average Recorded Investment	3,621	4,404
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	542	2,570
Unpaid Principal Balance	8,630	9,426
Related Allowance	0	0
Average Recorded Investment	1,327	926
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,101	2,486
Unpaid Principal Balance	3,303	3,426
Related Allowance	0	0
Average Recorded Investment	2,294	3,478
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,590	12,016
Unpaid Principal Balance	11,872	12,368
Related Allowance	0	0
Average Recorded Investment	11,547	11,868
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	510	727
Unpaid Principal Balance	527	814
Related Allowance	0	0
Average Recorded Investment	427	544
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,080	11,289
Unpaid Principal Balance	11,345	11,554
Related Allowance	0	0
Average Recorded Investment	11,120	11,324
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,191	7,593
Unpaid Principal Balance	7,189	10,877
Related Allowance	0	0
Average Recorded Investment	3,554	5,277
Multi-family | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	761	3,770
Unpaid Principal Balance	4,754	7,054
Related Allowance	0	0
Average Recorded Investment	1,117	1,545
Multi-family | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,430	3,823
Unpaid Principal Balance	2,435	3,823
Related Allowance	0	0
Average Recorded Investment	2,437	3,732
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	31,133	28,551
Unpaid Principal Balance	35,839	36,698
Related Allowance	0	0
Average Recorded Investment	28,728	27,016
Commercial real estate | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,331	9,427
Unpaid Principal Balance	8,671	15,620
Related Allowance	0	0
Average Recorded Investment	4,686	8,130
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	23,802	19,124
Unpaid Principal Balance	27,168	21,078
Related Allowance	0	0
Average Recorded Investment	24,042	18,886
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	953	2,955
Unpaid Principal Balance	6,687	13,066
Related Allowance	0	0
Average Recorded Investment	948	2,681
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	953	2,955
Unpaid Principal Balance	6,687	13,066
Related Allowance	0	0
Average Recorded Investment	948	2,681
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,655	2,126
Unpaid Principal Balance	2,024	2,975
Related Allowance	0	0
Average Recorded Investment	1,638	1,895
HELOC | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	262	683
Unpaid Principal Balance	631	1,532
Related Allowance	0	0
Average Recorded Investment	245	536
HELOC | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,393	1,443
Unpaid Principal Balance	1,393	1,443
Related Allowance	0	0
Average Recorded Investment	1,393	1,359
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	576	576
Unpaid Principal Balance	765	992
Related Allowance	0	0
Average Recorded Investment	483	492
Consumer | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	479	477
Unpaid Principal Balance	479	703
Related Allowance	0	0
Average Recorded Investment	385	390
Consumer | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	97	99
Unpaid Principal Balance	286	289
Related Allowance	0	0
Average Recorded Investment	$ 98	$ 102

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Paragraph 15
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