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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 127,576	$ 127,155	$ 123,073	$ 121,922	$ 118,456	$ 113,494
Loans receivable, gross	12,540,254		12,201,387
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	126,922		122,947
Loans receivable, gross	$ 11,265,547		$ 11,000,212
Ratio	1.10%		1.10%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 654		$ 126
Loans receivable, gross	$ 115,429		$ 28,553
Ratio	0.60%		0.40%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 34,144	35,928	$ 36,892	37,164	38,206	37,796
Loans receivable, gross	5,705,350		5,711,004
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	34,144		36,892
Loans receivable, gross	$ 5,684,940		$ 5,713,576
Ratio	0.60%		0.70%
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 27,608		$ 5,552
Ratio	0.00%		0.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 27,389	25,214	$ 24,556	25,061	21,934	19,838
Loans receivable, gross	1,732,202		1,597,996
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	27,389		24,556
Loans receivable, gross	$ 911,650		$ 793,958
Ratio	3.00%		3.10%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 5,012		$ 0
Ratio	0.00%		0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,081	2,052	$ 1,944	1,176	1,110	1,080
Loans receivable, gross	597,671		602,631
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,081		1,944
Loans receivable, gross	$ 295,699		$ 277,495
Ratio	0.70%		0.70%
Construction - custom | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 105
Ratio	0.00%		0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 7,622	7,355	$ 6,829	6,669	6,665	6,023
Loans receivable, gross	141,628		124,308
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	7,622		6,828
Loans receivable, gross	$ 116,877		$ 104,767
Ratio	6.50%		6.50%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 1
Loans receivable, gross	$ 2,186		$ 89
Ratio	0.00%		1.00%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,853	2,906	$ 2,649	2,513	2,501	2,535
Loans receivable, gross	102,779		104,405
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,853		2,649
Loans receivable, gross	$ 95,482		$ 96,337
Ratio	3.00%		2.80%
Land - consumer lot loans | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 495		$ 171
Ratio	0.00%		0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 7,982	7,904	$ 7,862	7,929	7,629	6,925
Loans receivable, gross	1,328,049		1,303,148
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	7,978		7,857
Loans receivable, gross	$ 1,324,959		$ 1,302,625
Ratio	0.60%		0.60%
Multi-family | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 4		$ 5
Loans receivable, gross	$ 3,068		$ 493
Ratio	0.10%		1.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,588	11,625	$ 11,818	10,772	10,168	8,588
Loans receivable, gross	1,443,437		1,434,610
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	11,484		11,698
Loans receivable, gross	$ 1,385,851		$ 1,391,668
Ratio	0.80%		0.80%
Commercial real estate | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 104		$ 120
Loans receivable, gross	$ 39,861		$ 21,765
Ratio	0.30%		0.60%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 29,330	29,268	$ 28,524	28,365	27,736	28,008
Loans receivable, gross	1,151,108		1,093,360
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	28,784		28,524
Loans receivable, gross	$ 1,114,171		$ 1,093,210
Ratio	2.60%		2.60%
Commercial & industrial | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 546		$ 0
Loans receivable, gross	$ 36,888		$ 81
Ratio	1.50%		0.00%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 802	808	$ 855	826	832	813
Loans receivable, gross	135,119		144,850
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	802		855
Loans receivable, gross	$ 133,152		$ 141,689
Ratio	0.60%		0.60%
HELOC | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 273		$ 215
Ratio	0.00%		0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 3,785	$ 4,095	$ 1,144	$ 1,447	$ 1,675	$ 1,888
Loans receivable, gross	202,911		85,075
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,785		1,144
Loans receivable, gross	$ 202,766		$ 84,887
Ratio	1.90%		1.40%
Consumer | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 38		$ 82
Ratio	0.00%		0.00%

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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Allowance as a Percentage of Outstanding Loans and Leases

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