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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, 2019	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 135,666	$ 149,546
Unpaid Principal Balance	148,547	164,561
Related Allowance	1,370	2,647
Average Recorded Investment (Year-To-Date)	142,609	175,187
Amount of related allowance included in specific reserves	260	439
Amount of related allowance included in general reserves	1,110	2,208
Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	24,831	27,869
Unpaid Principal Balance	34,865	38,486
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	26,351	35,649
Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	110,835	121,677
Unpaid Principal Balance	113,682	126,075
Related Allowance	1,370	2,647
Average Recorded Investment (Year-To-Date)	116,258	139,538
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	118,669	130,021
Unpaid Principal Balance	121,980	133,861
Related Allowance	1,110	2,208
Average Recorded Investment (Year-To-Date)	124,345	142,661
Single-family residential | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	16,505	17,979
Unpaid Principal Balance	17,474	19,252
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	17,242	16,685
Single-family residential | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	102,164	112,042
Unpaid Principal Balance	104,506	114,609
Related Allowance	1,110	2,208
Average Recorded Investment (Year-To-Date)	107,103	125,976
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		1,172
Construction | 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)		1,172
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment (Year-To-Date)		251
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)		251
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	86	169
Unpaid Principal Balance	150	295
Related Allowance	15	0
Average Recorded Investment (Year-To-Date)	128	389
Land - acquisition & development | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	78
Unpaid Principal Balance	0	143
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	39	290
Land - acquisition & development | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	86	91
Unpaid Principal Balance	150	152
Related Allowance	15	0
Average Recorded Investment (Year-To-Date)	89	99
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,825	3,900
Unpaid Principal Balance	4,495	4,543
Related Allowance	0	20
Average Recorded Investment (Year-To-Date)	3,863	4,611
Land - consumer lot loans | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	269	344
Unpaid Principal Balance	845	848
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	307	287
Land - consumer lot loans | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,556	3,556
Unpaid Principal Balance	3,650	3,695
Related Allowance	0	20
Average Recorded Investment (Year-To-Date)	3,556	4,324
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	380	385
Unpaid Principal Balance	380	385
Related Allowance	1	4
Average Recorded Investment (Year-To-Date)	383	704
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)		286
Multi-family | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	380	385
Unpaid Principal Balance	380	385
Related Allowance	1	4
Average Recorded Investment (Year-To-Date)	383	418
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,487	11,635
Unpaid Principal Balance	15,047	17,179
Related Allowance	174	323
Average Recorded Investment (Year-To-Date)	11,061	14,050
Commercial real estate | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,249	7,467
Unpaid Principal Balance	11,585	11,881
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	7,358	8,890
Commercial real estate | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,238	4,168
Unpaid Principal Balance	3,462	5,298
Related Allowance	174	323
Average Recorded Investment (Year-To-Date)	3,703	5,160
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	848	1,540
Unpaid Principal Balance	5,027	6,003
Related Allowance	70	92
Average Recorded Investment (Year-To-Date)	1,195	9,703
Commercial & industrial | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	437	1,114
Unpaid Principal Balance	4,508	5,312
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	776	7,168
Commercial & industrial | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	411	426
Unpaid Principal Balance	519	691
Related Allowance	70	92
Average Recorded Investment (Year-To-Date)	419	2,535
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,311	1,786
Unpaid Principal Balance	1,326	1,894
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,549	1,558
HELOC | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	369	837
Unpaid Principal Balance	369	931
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	603	597
HELOC | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	942	949
Unpaid Principal Balance	957	963
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	946	961
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	60	110
Unpaid Principal Balance	142	401
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	85	88
Consumer | Impaired loans with no related allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	2	50
Unpaid Principal Balance	84	119
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	26	23
Consumer | Impaired loans with an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	58	60
Unpaid Principal Balance	58	282
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 59	$ 65

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
-Subparagraph (g)
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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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