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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, 2018	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 187,634	$ 199,545
Unpaid Principal Balance	202,500	214,712
Related Allowance	2,998	3,388
Average Recorded Investment (Year-To-Date)	193,593	228,398
Amount of related allowance included in specific reserves	500	517
Amount of related allowance included in general reserves	2,498	2,871
Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	37,941	42,687
Unpaid Principal Balance	44,931	49,425
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	40,316	43,292
Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	149,693	156,858
Unpaid Principal Balance	157,569	165,287
Related Allowance	2,998	3,388
Average Recorded Investment (Year-To-Date)	153,277	185,106
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	149,246	158,668
Unpaid Principal Balance	153,509	163,149
Related Allowance	2,498	2,871
Average Recorded Investment (Year-To-Date)	153,957	181,826
Single-family residential | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,438	18,872
Unpaid Principal Balance	16,633	20,050
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	17,155	20,097
Single-family residential | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	133,808	139,796
Unpaid Principal Balance	136,876	143,099
Related Allowance	2,498	2,871
Average Recorded Investment (Year-To-Date)	136,802	161,729
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,630	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	2,164	1,349
Construction | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,630	2,698
Unpaid Principal Balance	1,750	2,818
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	2,164	1,349
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Construction - custom | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		74
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	438	921
Unpaid Principal Balance	491	971
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	680	611
Land - acquisition & development | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	335	814
Unpaid Principal Balance	335	814
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	575	572
Land - acquisition & development | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	103	107
Unpaid Principal Balance	156	157
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	105	39
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,782	5,227
Unpaid Principal Balance	5,211	5,626
Related Allowance	9	9
Average Recorded Investment (Year-To-Date)	5,005	6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	181	311
Unpaid Principal Balance	281	336
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	246	260
Land - consumer lot loans | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,601	4,916
Unpaid Principal Balance	4,930	5,290
Related Allowance	9	9
Average Recorded Investment (Year-To-Date)	4,759	6,449
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	435	448
Unpaid Principal Balance	435	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	442	541
Multi-family | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		70
Multi-family | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	435	448
Unpaid Principal Balance	435	448
Related Allowance	4	4
Average Recorded Investment (Year-To-Date)	442	471
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,497	15,679
Unpaid Principal Balance	21,660	21,768
Related Allowance	142	150
Average Recorded Investment (Year-To-Date)	15,588	21,603
Commercial real estate | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,945	9,425
Unpaid Principal Balance	15,035	14,035
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	9,685	11,158
Commercial real estate | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,552	6,254
Unpaid Principal Balance	6,625	7,733
Related Allowance	142	150
Average Recorded Investment (Year-To-Date)	5,903	10,445
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	14,027	14,428
Unpaid Principal Balance	17,557	17,652
Related Allowance	345	354
Average Recorded Investment (Year-To-Date)	14,228	13,703
Commercial & industrial | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,868	10,137
Unpaid Principal Balance	10,055	10,146
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	10,003	9,208
Commercial & industrial | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,159	4,291
Unpaid Principal Balance	7,502	7,506
Related Allowance	345	354
Average Recorded Investment (Year-To-Date)	4,225	4,495
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,487	1,386
Unpaid Principal Balance	1,590	2,154
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,437	1,845
HELOC | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	519	410
Unpaid Principal Balance	612	1,170
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	465	450
HELOC | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	968	976
Unpaid Principal Balance	978	984
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	972	1,395
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	92	90
Unpaid Principal Balance	297	126
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	92	137
Consumer | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	25	20
Unpaid Principal Balance	230	56
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	23	54
Consumer | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	67	70
Unpaid Principal Balance	67	70
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 69	$ 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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