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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 121,922	$ 118,456	$ 113,494	$ 109,919	$ 107,901	$ 106,829
Loans receivable, gross	11,640,489		10,950,608
Acquired and Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	70,000
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	121,822		113,128
Loans receivable, gross	$ 10,494,900		$ 9,784,140
Ratio	1.20%		1.20%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 100		$ 366
Loans receivable, gross	$ 65,658		$ 34,271
Ratio	0.20%		1.10%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 37,164	38,206	$ 37,796	41,828	47,756	47,347
Loans receivable, gross	5,693,072		5,658,830
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	37,164		37,536
Loans receivable, gross	$ 5,661,673		$ 5,585,912
Ratio	0.70%		0.70%
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 260
Loans receivable, gross	$ 25,370		$ 19,629
Ratio	0.00%		1.30%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 25,061	21,934	$ 19,838	15,726	7,014	6,680
Loans receivable, gross	1,311,635		1,110,411
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	25,061		19,838
Loans receivable, gross	$ 593,479		$ 498,450
Ratio	4.20%		4.00%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 0		$ 0
Ratio	0.00%		0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,176	1,110	$ 1,080	1,022	1,062	990
Loans receivable, gross	527,319		473,069
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,176		1,080
Loans receivable, gross	$ 251,801		$ 229,298
Ratio	0.50%		0.50%
Construction - custom | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 105		$ 330
Ratio	0.00%		0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 6,669	6,665	$ 6,023	7,252	6,778	5,781
Loans receivable, gross	118,726		118,497
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,666		6,022
Loans receivable, gross	$ 102,281		$ 90,850
Ratio	6.50%		6.60%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2		$ 2
Loans receivable, gross	$ 438		$ 850
Ratio	0.10%		0.20%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,513	2,501	$ 2,535	2,466	3,001	2,946
Loans receivable, gross	101,227		104,567
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,513		2,535
Loans receivable, gross	$ 91,402		$ 92,828
Ratio	2.70%		2.70%
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	$ 794		$ 558
Ratio	0.00%		0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 7,929	7,629	$ 6,925	6,784	5,047	5,304
Loans receivable, gross	1,266,911		1,124,290
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	7,919		6,911
Loans receivable, gross	$ 1,264,130		$ 1,091,974
Ratio	0.60%		0.60%
Multi-family | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 10		$ 13
Loans receivable, gross	$ 2,496		$ 1,505
Ratio	0.30%		0.90%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 10,772	10,168	$ 8,588	7,783	10,344	8,960
Loans receivable, gross	1,296,039		1,093,639
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10,685		8,497
Loans receivable, gross	$ 1,226,228		$ 957,380
Ratio	0.90%		0.90%
Commercial real estate | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 88		$ 91
Loans receivable, gross	$ 26,112		$ 11,157
Ratio	0.30%		0.80%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 28,365	27,736	$ 28,008	23,824	24,096	24,980
Loans receivable, gross	1,071,629		978,589
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	28,365		28,008
Loans receivable, gross	$ 1,059,310		$ 966,930
Ratio	2.70%		2.90%
Commercial & industrial | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0		$ 0
Loans receivable, gross	$ 9,606		$ 0
Ratio	0.00%		0.00%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 826	832	$ 813	828	820	902
Loans receivable, gross	146,172		149,716
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	826		813
Loans receivable, gross	$ 137,124		$ 133,203
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	$ 722		$ 239
Ratio	0.00%		0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,447	$ 1,675	$ 1,888	$ 2,406	$ 1,983	$ 2,939
Loans receivable, gross	107,759		139,000
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,447		1,888
Loans receivable, gross	$ 107,472		$ 137,315
Ratio	1.30%		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	$ 15		$ 3
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
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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=65884687&loc=d3e4428-111522

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