Washington Federal (WAFD) 10-K 21 Nov 17 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2017	Nov. 16, 2017	Mar. 31, 2017
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	WAFD
Entity Registrant Name	WASHINGTON FEDERAL INC
Entity Central Index Key	936,528
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		86,887,168
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,930,108,288

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
ASSETS
Cash and cash equivalents	$ 313,070	$ 450,368
Available-for-sale securities, at fair value	1,266,209	1,922,894
Held-to-maturity securities, at amortized cost	1,646,856	1,417,599
Loans receivable, net of allowance for loan losses of $123,073 and $113,494	10,882,622	9,910,920
Interest receivable	41,643	37,669
Premises and equipment, net	263,694	281,951
Real estate owned	20,658	29,027
FHLB & FRB stock	122,990	117,205
Bank owned life insurance	211,330	208,123
Intangible assets, including goodwill of $293,153 and $291,503	298,682	296,989
Federal and state income tax assets, net	0	16,047
Other assets	185,826	199,271
Total assets	15,253,580	14,888,063
Customer accounts
Transaction deposit accounts	6,361,158	6,005,592
Time deposit accounts	4,473,850	4,595,260
Customer accounts	10,835,008	10,600,852
FHLB advances	2,225,000	2,080,000
Advance payments by borrowers for taxes and insurance	56,631	42,898
Accrued expenses and other liabilities	131,253	188,582
Total liabilities	13,247,892	12,912,332
Stockholders’ equity
Common stock, $1.00 par value, 300,000,000 shares authorized; 134,957,511 and 134,307,818 shares issued; 87,193,362 and 89,680,847 shares outstanding	134,958	134,308
Paid-in capital	1,660,885	1,648,388
Accumulated other comprehensive income (loss), net of taxes	5,015	(11,156)
Treasury stock, at cost; 47,764,149 and 44,626,971 shares	(838,060)	(739,686)
Retained earnings	1,042,890	943,877
Total stockholders’ equity	2,005,688	1,975,731
Total liabilities and stockholders’ equity	$ 15,253,580	$ 14,888,063

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 123,073	$ 113,494
Goodwill	$ 293,153	$ 291,503
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	134,957,511	134,307,818
Common stock, shares outstanding (in shares)	87,193,362	89,680,847
Treasury stock, shares (in shares)	47,764,149	44,626,971

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
INTEREST INCOME
Loans receivable	$ 470,523	$ 454,085	$ 437,002
Mortgage-backed securities	60,612	62,949	71,392
Investment securities and cash equivalents	17,783	19,759	22,159
Total Income	548,918	536,793	530,553
INTEREST EXPENSE
Customer accounts	52,023	52,485	51,054
FHLB advances	64,969	64,059	66,018
Interest expense	116,992	116,544	117,072
Net interest income	431,926	420,249	413,481
Provision (release) for loan losses	(2,100)	(6,250)	(11,162)
Net interest income after provision (release) for loan losses	434,026	426,499	424,643
OTHER INCOME
Gain on sale of investment securities	3,499	0	9,641
Prepayment penalty on long-term debt	0	0	(10,554)
Loan fee income	4,290	5,548	8,788
Deposit fee income	22,643	21,738	22,459
Other income	21,783	19,750	10,089
Noninterest income	52,215	47,036	40,423
OTHER EXPENSE
Compensation and benefits	112,257	112,884	119,939
Occupancy	35,260	33,568	33,956
FDIC insurance premiums	11,410	11,824	7,916
Product delivery	13,972	17,060	22,325
Information technology	28,859	30,982	15,976
Other expense	29,761	29,129	24,739
Noninterest expense	231,519	235,447	224,851
Gain (loss) on real estate owned, net	1,494	10,046	9,304
Income before income taxes	256,216	248,134	249,519
Income tax expense (benefit)
Current	92,795	60,773	86,477
Deferred	(10,111)	23,312	2,726
Income taxes	82,684	84,085	89,203
NET INCOME	$ 173,532	$ 164,049	$ 160,316
PER SHARE DATA
Basic earnings per share (in dollars per share)	$ 1.95	$ 1.79	$ 1.68
Diluted earnings per share (in dollars per share)	1.94	1.78	1.67
Dividends paid on common stock per share (in dollars per share)	$ 0.84	$ 0.55	$ 0.54
Basic weighted average number of shares outstanding (in shares)	88,905,457	91,399,038	95,644,639
Diluted weighted average number of shares outstanding (in shares)	89,224,207	91,912,918	96,053,959

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 173,532	$ 164,049	$ 160,316
Other comprehensive income (loss) net of tax:
Net unrealized gains (losses) on available-for-sale securities	(7,587)	(1,403)	(27,536)
Reclassification adjustment of net gains from sale of available-for-sale securities included in net income	3,499	0	9,641
Related tax benefit (expense)	1,503	516	6,577
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	(2,585)	(887)	(11,318)
Net unrealized gain (loss) on long-term borrowing hedges	29,653	(16,793)	(14,287)
Related tax benefit (expense)	(10,897)	6,171	5,250
Derivatives qualifying as hedges, net of tax, portion attributable to parent	18,756	(10,622)	(9,037)
Other comprehensive income (loss)	16,171	(11,509)	(20,355)
Comprehensive income	$ 189,703	$ 152,540	$ 139,961

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance, Beginning of period at Sep. 30, 2014	$ 1,973,283	$ 133,323	$ 1,638,211	$ 706,149	$ 20,708	$ (525,108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	160,316			160,316
Other comprehensive income (loss)	(20,355)				(20,355)
Dividends on common stock	(36,711)			(36,711)
Compensation expense related to common stock options	231		231
Proceeds from exercise of common stock options	2,070	129	1,941
Restricted stock expense	3,573	244	3,329
Treasury stock purchased	(126,728)					(126,728)
Balance, End of period at Sep. 30, 2015	1,955,679	133,696	1,643,712	829,754	353	(651,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	164,049			164,049
Other comprehensive income (loss)	(11,509)				(11,509)
Dividends on common stock	(49,926)			(49,926)
Compensation expense related to common stock options	90		90
Proceeds from exercise of common stock options	9,283	433	8,850
Restricted stock expense	3,659	179	3,480
Repurchase of stock warrants	(7,744)		(7,744)
Treasury stock purchased	(87,850)					(87,850)
Balance, End of period at Sep. 30, 2016	1,975,731	134,308	1,648,388	943,877	(11,156)	(739,686)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	173,532			173,532
Other comprehensive income (loss)	16,171				16,171
Dividends on common stock	(74,519)			(74,519)
Proceeds from exercise of common stock options	7,238	317	6,921
Restricted stock expense	5,909	105	5,804
Repurchase of stock warrants	0	228	(228)
Treasury stock purchased	(98,374)					(98,374)
Balance, End of period at Sep. 30, 2017	$ 2,005,688	$ 134,958	$ 1,660,885	$ 1,042,890	$ 5,015	$ (838,060)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 173,532	$ 164,049	$ 160,316
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion expense	41,680	19,509	17,888
Cash received from (paid to) FDIC under loss share	584	1,730	720
Stock compensation expense	5,909	3,569	3,561
Provision (release) for loan losses	(2,100)	(6,250)	(11,162)
Loss (gain) on sale of investment securities	(3,499)	0	(9,641)
Loss on extinguishment of debt	0	0	10,554
Decrease (increase) in accrued interest receivable	(3,974)	2,760	11,608
Decrease (increase) in FDIC loss share receivable	0	0	1,795
Decrease (increase) in federal and state income tax receivable	16,047	5,153	13,829
Decrease (increase) in cash surrender value of bank owned life insurance	(6,498)	(5,627)	(2,496)
Gain on bank owned life insurance	(6,805)	0	0
Net realized (gain) loss on sales of premises and equipment and real estate owned	(1,673)	(20,039)	(18,887)
Decrease (increase) in other assets	7,974	(14,204)	(29,220)
Increase (decrease) in accrued expenses and other liabilities	(41,477)	71,071	(5,994)
Net cash provided (used) by operating activities	179,700	221,721	142,871
CASH FLOWS FROM INVESTING ACTIVITIES
Origination of loans and principal repayments, net	(896,450)	(619,046)	(551,168)
Loans purchased	(72,856)	(105,420)	(279,936)
FHLB & FRB stock purchase	(183,609)	(36,347)	(4,067)
FHLB & FRB stock redeemed	177,824	26,340	55,708
Available-for-sale securities purchased	(76,367)	(137,591)	(315,114)
Principal payments and maturities of available-for-sale securities	367,713	537,255	721,951
Proceeds from sales of available-for-sale investment securities	362,829	50,741	246,826
Held-to-maturity securities purchased	(466,058)	0	(259,489)
Principal payments and maturities of held-to-maturity securities	229,716	218,958	159,947
Proceeds from sales of real estate owned	16,248	61,132	74,895
Proceeds from settlements of bank owned life insurance	10,096	0	0
Purchase of bank owned life insurance	0	(100,000)	(100,000)
Net cash received (paid) in business combinations	(3,370)	0	0
Proceeds from sales of premises and equipment	5,209	14,685	6,397
Premises and equipment purchased and REO improvements	(15,461)	(41,771)	(46,439)
Net cash provided (used) by investing activities	(544,536)	(131,064)	(290,489)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in customer accounts	234,460	(30,775)	(85,073)
Proceeds from borrowings	4,590,000	1,118,000	100,000
Repayments of borrowings	(4,445,000)	(868,000)	(210,554)
Proceeds from exercise of common stock options and related tax benefit	7,238	9,283	2,070
Dividends paid on common stock	(74,519)	(49,926)	(51,111)
Repurchase of warrants	0	(7,744)	0
Treasury stock purchased	(98,374)	(87,850)	(126,728)
Increase (decrease) in advance payments by borrowers for taxes and insurance	13,733	(7,326)	21,220
Net cash provided (used) by financing activities	227,538	75,662	(350,176)
Increase (decrease) in cash and cash equivalents	(137,298)	166,319	(497,794)
Cash and cash equivalents at beginning of year	450,368	284,049	781,843
Cash and cash equivalents at end of year	313,070	450,368	284,049
Non-cash investing activities
Real estate acquired through foreclosure	3,266	12,697	28,735
Non-cash financing activities
Stock issued upon exercise of warrants	7,632	0	0
Cash paid during the year for
Interest	111,333	114,506	116,226
Income taxes	$ 54,078	$ 68,507	$ 65,720

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Company and nature of operations. Washington Federal, Inc. is a Washington corporation headquartered in Seattle, Washington. The Company is a bank holding company that conducts its operations through a national bank subsidiary, Washington Federal, National Association. The Bank is principally engaged in the business of attracting deposits from businesses and the general public and investing these funds, together with borrowings and other funds, in one-to-four family residential real estate loans, multi-family real estate loans and commercial loans. As used throughout this document, the terms "Washington Federal" or the "Company" refer to Washington Federal, Inc. and its consolidated subsidiaries and the term "Bank" refers to the operating subsidiary Washington Federal, National Association. The Bank conducts its activities through a network of 237 offices located in Washington, Oregon, Idaho, Utah, Arizona, Nevada, New Mexico and Texas. Basis of presentation and use of estimates. The Company’s accounting and financial reporting policies conform to accounting principles generally accepted in the United States of America (U.S. GAAP). Inter-company balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements, the Company makes estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and revenues and expenses during the reporting periods and related disclosures. The areas that require application of significant management judgments often result in the need to make estimates about the effect of matters that are inherently uncertain and may change in future periods. Actual results could differ materially from those estimates. Certain amounts in the financial statements from prior periods have been reclassified to conform to the current financial statement presentation. In certain instances, amounts in text are presented by rounding to the nearest thousand. The Company's fiscal year end is September 30. All references to 2017 , 2016 and 2015 represent balances as of September 30, 2017 , September 30, 2016 , and September 30, 2015 , or activity for the fiscal years then ended. Cash and cash equivalents. Cash and cash equivalents include cash on hand, amounts due from banks, overnight investments and repurchase agreements with an initial maturity of three months or less. Investments and mortgage-backed securities. The Company accounts for investments and mortgage-backed securities in two categories: held-to-maturity and available-for-sale. Premiums and discounts on investments are deferred and recognized into income over the contractual life of the asset using the effective interest method. Held-to-maturity securities are accounted for at amortized cost, but the Company must have both the positive intent and the ability to hold those securities to maturity. There are very limited circumstances under which securities in the held-to-maturity category can be sold without jeopardizing the cost basis of accounting for the remainder of the securities in this category. Available-for-sale securities are accounted for at fair value. Gains and losses realized on the sale of these securities are accounted for based on the specific identification method. Unrealized gains and losses for available-for-sale securities are excluded from earnings and reported net of the related tax effect in the accumulated other comprehensive income component of stockholders' equity. Realized gains and losses on securities sold as well as other than temporary impairment charges, if any, are shown on the Consolidated Statements of Operations under the Other Income heading. Management evaluates debt and equity securities for other than temporary impairment on a quarterly basis based on the securities' current credit quality, market interest rates, term to maturity and management's intent and ability to hold the securities until the net book value is recovered. Loans receivable. Loans that are performing in accordance with their contractual terms are carried at the unpaid principal balance, net of premiums, discounts and net deferred loan fees. Net deferred loan fees include nonrefundable loan origination fees less direct loan origination costs. Net deferred loan fees, premiums and discounts are amortized into interest income using either the interest method or straight-line method over the terms of the loans, adjusted for actual prepayments. In addition to fees and costs for originating loans, various other fees and charges related to existing loans may occur, including prepayment charges, late charges and assumption fees. When a borrower fails to make a required payment on a loan, the Bank attempts to cure the deficiency by contacting the borrower. Contact is made after a payment is 30 days past its grace period. In most cases, deficiencies are cured promptly. If the delinquency is not cured within 90 days, the Bank may institute appropriate action to foreclose on the property. If foreclosed, the property is sold at a public sale and may be purchased by the Bank. Restructured loans. The Bank will consider modifying the interest rates and terms of a loan if it determines that a modification is a better alternative to foreclosure. Most troubled debt restructured ("TDR") loans are accruing and performing loans where the borrower has proactively approached the Bank about modifications due to temporary financial difficulties. Each request is individually evaluated for merit and likelihood of success. The concession for these loans is typically a payment reduction through a rate reduction of 100 to 200 bps for a specific term, usually six to 12 months. Interest-only payments may also be approved during the modification period. Principal forgiveness is generally not an available option for restructured loans. Before granting approval to modify a loan in a TDR, the borrower’s ability to repay is evaluated, including: current income levels and debt to income ratio, borrower’s credit score, payment history of the loan and updated evaluation of the secondary repayment source. The Bank also modifies some loans that are not classified as TDRs as the modification is due to a restructuring where the effective interest rate on the debt is reduced to reflect a decrease in market interest rates. Non-accrual loans. Loans are placed on nonaccrual status when, in the judgment of management, the probability of collection of interest is deemed to be insufficient to warrant further accrual. When a loan is placed on nonaccrual status, previously accrued but unpaid interest is deducted from interest income. The Bank does not accrue interest on loans 90 days or more past due. If payment is made on a loan so that the loan becomes less than 90 days past due, and the Bank expects full collection of principal and interest, the loan is returned to full accrual status. Any interest ultimately collected is credited to income in the period of recovery. A loan is charged-off when the loss is estimable and it is confirmed that the borrower is not expected be able to meet contractual obligations. If a consumer loan is on non-accrual status before becoming a TDR it will stay on non-accrual status following restructuring until it has been performing for at least six months, at which point it may be moved to accrual status. If a loan is on accrual status before it becomes a TDR, and management concludes that full repayment is probable based on internal evaluation, it will remain on accrual status following restructuring. If the restructured consumer loan does not perform, it is placed on non-accrual status when it is 90 days delinquent. For commercial loans, six consecutive payments on newly restructured loan terms are required prior to returning the loan to accrual status. In some instances, after the required six consecutive payments are made, management will conclude that collection of the entire principal and interest due is still in doubt. In those instances, the loan will remain on non-accrual. Impaired loans. Impaired loans consist of loans receivable that are not expected to have their principal and interest repaid in accordance with their contractual terms. Collateral-dependent impaired loans are measured using the fair value of the collateral less selling costs. Non-collateral dependent loans are measured at the present value of expected future cash flows. Allowance for loan losses. The Bank maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable and estimable losses inherent in the loan portfolio. The Bank's general methodology for assessing the appropriateness of the allowance is to apply a loss percentage factor to the different loan types. The loss percentage factor is made up of two parts - the historical loss factor (“HLF”) and the qualitative loss factor (“QLF”). The HLF takes into account historical charge-offs by loan type. The Bank uses an average of historical loss rates for each loan category multiplied by a loss emergence period. This is the likely period of time during which a residential or commercial loan borrower experiencing financial difficulties might deplete their cash prior to becoming delinquent on their loan, plus the period of time that it takes the Bank to work out the loans. The QLF are based on management's continuing evaluation of the pertinent factors underlying the quality of the loan portfolio, including changes in the size and composition of the loan portfolio, actual loan loss experience, current economic conditions, collateral values, geographic concentrations, seasoning of the loan portfolio, specific industry conditions and the duration of the current business cycle. These factors are considered by loan type. Specific allowances are established for loans which are individually evaluated, in cases where management has identified significant conditions or circumstances related to a loan that management believes indicate the probability that a loss has been incurred. The Bank has also established a reserve for unfunded commitments. The recovery of the carrying value of loans is susceptible to future market conditions beyond the Bank's control, which may result in losses or recoveries differing from those estimated. Covered assets. Covered loans consist of single-family loans acquired from Horizon Bank in 2010 and certain loans acquired from South Valley Bank and Trust ("SVBT") in fiscal 2013 that were originally recorded at their estimated fair value at the time acquired. Covered real estate held for sale represents the foreclosed properties that were originally Horizon Bank loans or certain SVBT loans. Covered real estate held for sale is carried at the estimated fair value of the repossessed real estate. The covered loans and covered real estate held for sale are collectively referred to as “covered assets." When FDIC loss share agreements expire, any remaining loans will be transferred to the non-covered portfolio. Covered loans are included within loans receivable on the statement of financial condition. Covered real estate owned are included within real estate owned on the statement of financial condition. FDIC indemnification asset. The FDIC indemnification asset is the receivable recorded due to the guarantee provided by the FDIC on the covered assets. This asset declines due to collections from the FDIC on claims or the eventual expiration of the FDIC loss share agreements. The FDIC indemnification asset is included within other assets on the statement of financial condition. Client derivatives. Interest rate swap agreements are provided to certain clients who desire to convert their obligations from variable to fixed interest rates. Under these agreements, the Bank enters into a variable-rate loan agreement with a customer in addition to a swap agreement, and then enters into a corresponding swap agreement with a third party in order to offset its exposure on the customer swap agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under FASB ASC 815, Derivatives and Hedging, the instruments are marked to market in earnings. The change in fair value of the offsetting swaps are included in interest income and interest expense and there is no impact on net income. There is fee income earned on the swaps that is included in loan fee income. Long term borrowing hedges. The Company has entered into interest rate swaps to convert a series of future short-term borrowings to fixed-rate payments. These interest rate swaps qualify as cash flow hedging instruments under ASC 815 so gains and losses are recorded in Other Comprehensive Income to the extent the hedge is effective. Gains and losses on the interest rate swaps are reclassified from OCI to earnings in the period the hedged transaction affects earnings and are included in the same income statement line item that the hedged transaction is recorded. Commercial loan hedges. The Company has entered into interest rate swaps to hedge long term fixed rate commercial loans. These hedges qualify as fair value hedges under ASC 815 and provide for matching of the recognition of the gains and losses on the interest rate swap and the related hedged loan. Premises and equipment. Premises and equipment are stated at cost, less accumulated depreciation. Depreciation is computed on the straight-line method over the estimated useful lives of the respective assets. Expenditures are capitalized for betterments and major renewals. Charges for ordinary maintenance and repairs are expensed to operations as incurred. Real estate owned. Real estate properties acquired through foreclosure of loans or through acquisitions are recorded initially at fair value less selling costs and are subsequently recorded at lower of cost or fair value. Any gains (losses) and maintenance costs are shown on the real estate acquired through foreclosure line item. Intangible assets. Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired. Other intangibles, including core deposit intangibles, are acquired assets that lack physical substance but can be distinguished from goodwill. Goodwill is evaluated for impairment on an annual basis during the fourth quarter. Other intangible assets are amortized over their estimated lives and are subject to impairment testing when events or circumstances change. If circumstances indicate that the carrying value of the assets may not be recoverable, an impairment charge could be recorded. The Bank amortizes the core deposit intangibles over their estimated lives using an accelerated method. During the 4th quarter of 2017, an immaterial correction of $1.5 million was recorded to amortization expense for intangible assets stemming from acquisitions of insurance agency businesses in prior years. The table below provides detail regarding the Company's intangible assets. Goodwill Core Deposit and Other Intangibles Total (In thousands) Balance at September 30, 2015 $ 291,503 $ 7,855 $ 299,358 Amortization — (2,369 ) (2,369 ) Balance at September 30, 2016 291,503 5,486 296,989 Additions 1,650 1,720 3,370 Amortization — (1,677 ) (1,677 ) Balance at September 30, 2017 $ 293,153 $ 5,529 $ 298,682 The table below presents the estimated future amortization expense of core deposit and other intangibles for the next five years. Fiscal Year Expense (In thousands) 2018 $ 1,376 2019 1,324 2020 1,295 2021 457 2022 138 Income taxes. Income taxes are accounted for using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, a deferred tax asset or liability is determined based on the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The provision for income taxes includes current and deferred income tax expense based on net income adjusted for temporary and permanent differences such as depreciation, interest on state and municipal securities, and affordable housing tax credits. Income tax related interest and penalties, if applicable, and amortization of affordable housing tax credit investments are recorded within income tax expense. Accounting for stock-based compensation. We recognize in the statement of operations the grant-date fair value of stock options and other equity-based forms of compensation issued to employees over the employees' requisite service period (generally the vesting period). The requisite service period may be subject to performance conditions. Stock options and restricted stock awards generally vest ratably over three to ten years and are recognized as expense over that same period of time. The exercise price of each option equals the market price of the Company's common stock on the date of the grant, and the maximum term is ten years. No stock options were granted in 2017 , 2016 or 2015 . Certain grants of restricted stock are subject to performance-based and market-based vesting as well as other approved vesting conditions and cliff vest based on those conditions. Compensation expense is recognized over the service period to the extent restricted stock awards are expected to vest. See Note N for additional information. Business segments. As the Company manages its business and operations on a consolidated basis, management has determined that there is one reportable business segment. Subsequent events. The Company has evaluated subsequent events for adjustment to or disclosure in the Company’s consolidated financial statements through the date of this report, and the Company has not identified any recordable or disclosable events, not otherwise reported in these consolidated financial statements or the notes thereto, except for the following. On September 27, 2017, the Company issued a joint press release with Anchor Bancorp ("Anchor") announcing that they have entered into Amendment No. 1 ("Amendment No. 1") to the Agreement and Plan of Merger (the "Merger Agreement") dated as of April 11, 2017. Amendment No. 1 extends from December 31, 2017, to June 30, 2018, the date after which either party can elect to terminate the Merger Agreement if the merger transaction (the "Merger") contemplated by the Merger Agreement has not yet been completed. Amendment No. 1 also provides for up to three additional six month extensions beyond June 30, 2018, and addresses certain Anchor personnel and other matters in light of the extension. Except as explicitly provided in Amendment No. 1, the Merger Agreement remains in full force and effect as originally executed on April 11, 2017. On October 25, 2017 , the Company issued a press release announcing a quarterly cash dividend of 15 cents per share to be paid on November 20, 2017 , to common stockholders of record as of November 6, 2017 . This is Washington Federal’s 139th consecutive quarterly cash dividend.

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS In August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The ASU expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The effective date of the new standard for public companies is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition with a cumulative effect adjustment recorded to opening retained earnings as of the initial adoption date. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements . In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. The ASU clarifies that a financial asset is within the scope of Subtopic 610-20 if it meets the definition of an in substance nonfinancial asset. The amendments also define the term in substance nonfinancial asset. The amendments clarify that nonfinancial assets within the scope of Subtopic 610-20 may include nonfinancial assets transferred within a legal entity to a counterparty. A contract that includes the transfer of ownership interests in one or more consolidated subsidiaries is within the scope of Subtopic 610-20 if substantially all of the fair value of the assets that are promised to the counterparty in a contract is concentrated in nonfinancial assets. The amendments clarify that an entity should identify each distinct nonfinancial asset or in substance nonfinancial asset promised to a counterparty and derecognize each asset when a counterparty obtains control of it. The ASU is effective for public business entities for annual periods beginning after December 15, 2017, and interim periods therein. Entities may use either a full or modified approach to adopt the ASU. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment , which eliminates Step 2 from the goodwill impairment test. The ASU also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The ASU is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption being permitted for annual or interim goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations Clarifying the Definition of a Business (Topic 805) , for determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017, with early adoption permitted for transactions that occurred before the issuance date or effective date of the standard if the transactions were not reported in financial statements that have been issued or made available for issuance. The ASU must be applied prospectively and upon adoption the standard will impact how we assess acquisitions (or disposals) of assets or businesses. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash: a Consensus of the FASB Emerging Issues Task Force . This ASU requires a company’s cash flow statement to explain the changes during a reporting period of the totals for cash, cash equivalents, restricted cash, and restricted cash equivalents. Additionally, amounts for restricted cash and restricted cash equivalents are to be included with cash and cash equivalents if the cash flow statement includes a reconciliation of the total cash balances for a reporting period. This ASU is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017, with early application permitted. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments in this ASU address eight specific cash flow issues with the objective of reducing diversity in practice. The specific issues identified include: debt prepayments or extinguishment costs; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period; however, early adoption is permitted. The Company is currently evaluating the guidance to determine its adoption method and does not expect this guidance to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses . The amendments in this ASU were issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investments in leases and other commitments to extend credit held by a reporting entity at each reporting date. The amendments require that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The ASU eliminates the current framework of recognizing probable incurred losses and instead requires an entity to use its current estimate of all expected credit losses over the contractual life. The measurement of expected credit losses is based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets. For purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, an allowance for expected credit losses is recorded as an adjustment to the cost basis of the asset. Subsequent changes in estimated cash flows would be recorded as an adjustment to the allowance and through the statement of income. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses rather than as a direct write-down to the security's cost basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. For most debt securities, the transition approach requires a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period the guidance is effective. For other-than-temporarily impaired debt securities and PCD assets, the guidance will be applied prospectively. While the Company is currently in the process of evaluating the impact of the amended guidance on its consolidated financial statements, it currently expects the ALLL to increase upon adoption given that the allowance will be required to cover the full remaining expected life of the portfolio upon adoption, rather than the incurred loss model under current U.S. GAAP. The extent of this increase is still being evaluated and will depend on economic conditions and the composition of the Company’s loan and lease portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, Leases . The amendments require lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. The guidance also simplifies the accounting for sale and leaseback transactions. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is currently in the process of accumulating the lease data necessary to apply the amended guidance. The Company is continuing to evaluate the impact of the amended guidance on its consolidated financial statements, but the effects of recognizing most operating leases is not expected to be material. The Company expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , to require all equity investments to be measured at fair value with changes in the fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update was to be effective for interim and annual periods beginning after December 15, 2016. However, in August 2015, the FASB issued ASU 2015-14, which delayed the effective date of ASU 2014-09 by one year and permits companies to voluntarily adopt the new standard as of the original effective date. The Company does not expect this guidance to have a material impact on its consolidated financial statements.

Investment Securities

Investment Securities	12 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES The tables below provide detail regarding the amortized cost and fair value of available-for-sale and held-to-maturity investment securities. September 30, 2017 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses (In thousands) Available-for-sale securities U.S. government and agency securities due Within 1 year $ 9,300 $ 146 $ — $ 9,446 10.38 % 1 to 5 years 5,688 2 — 5,690 1.51 5 to 10 years 69,108 — (1,238 ) 67,870 1.93 Over 10 years 127,936 353 (218 ) 128,071 1.92 Equity Securities 1 to 5 years 500 22 — 522 1.80 Corporate debt securities due 1 to 5 years 63,622 2,083 — 65,705 2.96 5 to 10 years 119,960 210 (577 ) 119,593 2.62 Municipal bonds due Within 1 year 2,344 10 — 2,354 1.23 1 to 5 years 1,367 55 — 1,422 2.05 Over 10 years 20,343 2,505 — 22,848 6.45 Mortgage-backed securities Agency pass-through certificates 828,069 8,402 (2,174 ) 834,297 2.96 Commercial MBS 8,350 41 — 8,391 3.31 1,256,587 13,829 (4,207 ) 1,266,209 2.86 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,646,856 7,143 (18,086 ) 1,635,913 3.14 1,646,856 7,143 (18,086 ) 1,635,913 3.14 $ 2,903,443 $ 20,972 $ (22,293 ) $ 2,902,122 3.02 % September 30, 2016 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses (In thousands) Available-for-sale securities U.S. government and agency securities due Within 1 year $ 21,284 $ — $ (59 ) $ 21,225 0.81 % 1 to 5 years 12,477 1,027 (11 ) 13,493 7.94 5 to 10 years 48,134 — (1,589 ) 46,545 1.14 Over 10 years 182,051 27 (3,990 ) 178,088 1.33 Equity Securities 1 to 5 years 100,422 1,402 — 101,824 1.90 Corporate debt securities due Within 1 year 278,094 325 (53 ) 278,366 1.33 1 to 5 years 63,481 928 (113 ) 64,296 2.47 5 to 10 years 69,955 — (2,417 ) 67,538 1.96 Over 10 years 50,000 938 — 50,938 3.00 Municipal bonds due 1 to 5 years 2,315 2 — 2,317 1.23 5 to 10 years 1,335 38 — 1,373 2.05 Over 10 years 20,363 3,617 — 23,980 6.45 Mortgage-backed securities Agency pass-through certificates 978,955 17,118 (3,032 ) 993,041 2.58 Commercial MBS 80,318 — (448 ) 79,870 1.91 1,909,184 25,422 (11,712 ) 1,922,894 2.22 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,417,599 24,171 (214 ) 1,441,556 3.18 1,417,599 24,171 (214 ) 1,441,556 3.18 $ 3,326,783 $ 49,593 $ (11,926 ) $ 3,364,450 2.62 % The Company purchased $76,367,000 available-for-sale investment securities and $466,058,000 of held-to-maturity investment securities during 2017 . The Company sold $362,829,000 of available-for-sale securities and there were no sales of held-to-maturity investment securities in 2017 . Substantially all mortgage-backed securities have contractual due dates that exceed 25 years. The following table shows the gross unrealized losses and fair value of securities at September 30, 2017 , and September 30, 2016 , by length of time that individual securities in each category have been in a continuous loss position. Management believes that the declines in fair value of these investments are not an other than temporary impairment as these losses are due to a change in interest rates rather than any credit deterioration. The impairment is also deemed to be temporary because: 1) the Bank does not intend to sell the security, and 2) it is not more likely than not that it will be required to sell the security before recovery of the entire amortized cost basis of the security. September 30, 2017 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ — $ — $ (577 ) $ 49,423 $ (577 ) $ 49,423 U.S. agency securities (759 ) 24,400 (697 ) 96,195 (1,456 ) 120,595 Agency pass-through certificates (17,683 ) 1,163,358 (2,577 ) 249,304 (20,260 ) 1,412,662 $ (18,442 ) $ 1,187,758 $ (3,851 ) $ 394,922 $ (22,293 ) $ 1,582,680 September 30, 2016 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ — $ — $ (2,582 ) $ 100,467 $ (2,582 ) $ 100,467 U.S. agency securities (11 ) 3,167 (5,638 ) 220,613 (5,649 ) 223,780 Agency pass-through certificates (1,278 ) 301,030 (2,417 ) 232,407 (3,695 ) 533,437 $ (1,289 ) $ 304,197 $ (10,637 ) $ 553,487 $ (11,926 ) $ 857,684

Loans Receivable

Loans Receivable	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Receivable	LOANS RECEIVABLE The following table is a summary of loans receivable. September 30, 2017 September 30, 2016 (In thousands) (In thousands) Gross loans by category Single-family residential $ 5,711,004 46.8 % $ 5,658,830 51.7 % Construction 1,597,996 13.1 1,110,411 10.1 Construction - custom 602,631 4.9 473,069 4.3 Land - acquisition & development 124,308 1.0 118,497 1.1 Land - consumer lot loans 104,405 0.9 104,567 1.0 Multi-family 1,303,148 10.7 1,124,290 10.3 Commercial real estate 1,434,610 11.8 1,093,639 10.0 Commercial & industrial 1,093,360 9.0 978,589 8.9 HELOC 144,850 1.2 149,716 1.4 Consumer 85,075 0.7 139,000 1.3 Total gross loans 12,201,387 100 % 10,950,608 100 % Less: Allowance for probable losses 123,073 113,494 Loans in process 1,149,934 879,484 Net deferred fees, costs and discounts 45,758 46,710 Total loan contra accounts 1,318,765 1,039,688 Net loans $ 10,882,622 $ 9,910,920 The following summary breaks down the Company's fixed rate and adjustable rate loans by time to maturity or to rate adjustment. September 30, 2017 Fixed-Rate Adjustable-Rate Term To Maturity Gross Loans % of Gross Loans Term To Rate Adjustment Gross Loans % of Gross Loans (In thousands) (In thousands) Within 1 year $ 71,810 0.6 % Less than 1 year $ 3,157,055 25.9 % 1 to 3 years 216,724 1.8 1 to 3 years 498,844 4.1 3 to 5 years 308,967 2.5 3 to 5 years 624,254 5.1 5 to 10 years 847,518 6.9 5 to 10 years 512,774 4.2 10 to 20 years 1,047,541 8.6 10 to 20 years — — Over 20 years 4,915,900 40.3 Over 20 years — — $ 7,408,460 60.7 % $ 4,792,927 39.3 % The following tables provide information regarding loans receivable by loan category and geography. September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC Total (In thousands) Washington $ 3,013,957 $ 315,356 $ 55,794 $ 65,449 $ 357,080 $ 613,362 $ 528,762 $ 555,651 $ 2,186 $ 87,290 $ 5,594,887 Oregon 659,602 378,588 33,109 13,535 59,861 269,037 254,513 217,813 2,252 13,577 1,901,887 Arizona 581,137 340,609 4,801 11,446 77,315 102,546 218,200 50,506 296 13,781 1,400,637 Other 57,891 3,423 — 69 — 4,360 95,304 106,226 78,614 53 345,940 Utah 514,922 40,014 90 4,321 55,064 272,723 28,586 38,328 22 7,823 961,893 Idaho 306,853 41,243 14,593 4,586 23,721 45,603 65,342 29,529 123 7,293 538,886 New Mexico 202,703 115,289 10,272 2,108 17,406 62,635 173,774 14,186 768 13,332 612,473 Texas 185,835 43,493 5,649 106 3,534 205,595 61,439 59,484 775 — 565,910 Nevada 188,104 25,133 — 2,785 8,650 22,135 8,690 21,637 39 1,701 278,874 $ 5,711,004 $ 1,303,148 $ 124,308 $ 104,405 $ 602,631 $ 1,597,996 $ 1,434,610 $ 1,093,360 $ 85,075 $ 144,850 $ 12,201,387 Percentage by geographic area September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC Total As % of total gross loans Washington 24.6 % 2.6 % 0.4 % 0.5 % 2.9 % 5.1 % 4.4 % 4.6 % — % 0.7 % 45.8 % Oregon 5.4 3.1 0.3 0.1 0.5 2.2 2.1 1.8 — 0.1 15.6 Arizona 4.8 2.8 — 0.1 0.6 0.8 1.8 0.4 — 0.1 11.4 Other 0.5 — — — — — 0.8 0.9 0.7 — 2.9 Utah 4.2 0.3 — 0.1 0.5 2.2 0.2 0.3 — 0.1 7.9 Idaho 2.5 0.4 0.1 0.1 0.2 0.4 0.5 0.2 — 0.1 4.5 New Mexico 1.7 0.9 0.1 — 0.1 0.5 1.4 0.1 — 0.1 4.9 Texas 1.5 0.4 — — — 1.7 0.5 0.5 — — 4.6 Nevada 1.5 0.2 0.1 — 0.1 0.2 0.1 0.2 — — 2.4 46.7 % 10.7 % 1.0 % 0.9 % 4.9 % 13.1 % 11.8 % 9.0 % 0.7 % 1.2 % 100 % Percentage by geographic area as a % of each loan type September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC As % of total gross loans Washington 52.8 % 24.2 % 44.9 % 62.6 % 59.4 % 38.3 % 36.9 % 50.9 % 2.8 % 60.3 % Oregon 11.5 29.1 26.6 13.0 9.9 16.8 17.7 19.9 2.6 9.4 Arizona 10.2 26.1 3.9 11.0 12.8 6.4 15.2 4.6 0.3 9.5 Other 1.0 0.3 — 0.1 — 0.3 6.6 9.7 92.4 — Utah 9.0 3.1 0.1 4.1 9.1 17.1 2.0 3.5 — 5.4 Idaho 5.4 3.2 11.7 4.4 3.9 2.9 4.6 2.7 0.1 5.0 New Mexico 3.5 8.8 8.3 2.0 2.9 3.9 12.1 1.3 0.9 9.2 Texas 3.3 3.3 4.5 0.1 0.6 12.9 4.3 5.4 0.9 — Nevada 3.3 1.9 — 2.7 1.4 1.4 0.6 2.0 — 1.2 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 % The Company has granted loans to officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans, including unfunded commitments to lend, was $84,166,000 and $57,153,000 at September 30, 2017 and 2016 , respectively. As of September 30, 2017 , all of these loans were performing in accordance with contractual terms. The following table provides additional information on impaired loans, loan commitments and loans serviced for others. September 30, 2017 September 30, 2016 (In thousands) Recorded investment in impaired loans $ 251,274 $ 285,243 TDRs included in impaired loans 207,377 261,531 Allocated reserves on impaired loans 1,363 1,980 Specific reserves on impaired loans 126 366 Average balance of impaired loans for year ended 274,530 301,685 Interest income from impaired loans for year ended 11,736 12,843 Outstanding fixed-rate origination commitments 425,130 331,947 Gross loans serviced for others 77,119 80,896 The following table sets forth information regarding non-accrual loans. September 30, 2017 September 30, 2016 (In thousands) (In thousands) Non-accrual loans: Single-family residential $ 27,930 56.3 % $ 33,148 78.2 % Construction - custom 91 0.2 — — Land - acquisition & development 296 0.6 58 0.1 Land - consumer lot loans 605 1.2 510 1.2 Multi-family 139 0.3 776 1.8 Commercial real estate 11,815 23.8 7,100 16.7 Commercial & industrial 8,082 16.3 583 1.4 HELOC 531 1.1 239 0.6 Consumer 91 0.2 — — Total non-accrual loans $ 49,580 100 % $ 42,414 100 % Non-accrual loans as % of total loans 0.46 % 0.43 % The following table breaks down delinquent loans by loan category and delinquency bucket. September 30, 2017 Amount of Loans Days Delinquent Based on $ Amount of Loans % based on $ Loan type Net of Loans in Process Current 30 60 90 Total (In thousands) Single-family residential $ 5,709,690 $ 5,671,933 $ 10,925 $ 4,810 $ 22,022 $ 37,757 0.66 % Construction 793,959 793,959 — — — — — Construction - custom 277,599 277,508 — — 91 91 0.03 Land - acquisition & development 104,856 104,526 — — 330 330 0.31 Land - consumer lot loans 104,335 103,389 112 680 154 946 0.91 Multi-family 1,303,119 1,302,720 5 255 139 399 0.03 Commercial real estate 1,434,610 1,432,052 507 — 2,051 2,558 0.18 Commercial & industrial 1,093,360 1,092,735 — 51 574 625 0.06 HELOC 144,850 143,974 221 342 313 876 0.60 Consumer 85,075 84,644 245 107 79 431 0.51 Total Loans $ 11,051,453 $ 11,007,440 $ 12,015 $ 6,245 $ 25,753 $ 44,013 0.40 % Delinquency % 99.60% 0.11% 0.06% 0.23% 0.40% The percentage of total delinquent loans was 0.40% as of September 30, 2017 , as compared to 0.68% as of September 30, 2016 . Most loans restructured in troubled debt restructurings ("TDRs") are accruing and performing loans where the borrower has proactively approached the Company about modifications due to temporary financial difficulties. Each request is individually evaluated for merit and likelihood of success. The concession for these loans is typically a payment reduction through a rate reduction of 100 to 200 bps for a specific term, usually six to 12 months. Interest-only payments may also be approved during the modification period. Principal forgiveness is not an available option for restructured loans. As of September 30, 2017 , the outstanding balance of TDR's was $207,377,000 as compared to $261,531,000 as of September 30, 2016 . As of September 30, 2017 , 97.5% of the restructured loans were performing. Single-family residential loans comprised 87.7% of TDR loans as of September 30, 2017 . The Company reserves for restructured loans within its allowance for loan loss methodology by taking into account the following performance indicators: 1) time since modification; 2) current payment status and 3) geographic area. The following table provides information related to loans that were modified in a TDR during the periods presented. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Troubled Debt Restructurings: Contracts Investment Investment Contracts Investment Investment (In thousands) (In thousands) Single-family residential 38 $ 7,115 $ 7,115 120 $ 23,541 $ 23,541 Land - consumer lot loans 2 211 211 10 970 970 Commercial real estate — — — 7 2,523 2,523 HELOC 4 552 552 1 126 126 Consumer — — — 1 24 24 44 $ 7,878 $ 7,878 139 $ 27,184 $ 27,184 The following table provides information on payment defaults occurring during the periods presented where the loan had been modified in a TDR within 12 months of the payment default. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 Number of Recorded Number of Recorded TDRs That Subsequently Defaulted: Contracts Investment Contracts Investment (In thousands) (In thousands) Single-family residential 24 $ 4,214 17 $ 4,875 Construction — — 1 279 Land - consumer lot loans — — 5 606 Commercial real estate 2 267 2 326 26 $ 4,481 25 $ 6,086 The FDIC loss share coverage for the acquired commercial loans from the former Horizon Bank expired after March 31, 2015. These loans were transferred to loans receivable. The FDIC loss share coverage for the acquired commercial loans from the former Home Valley Bank expired after of September 30, 2015 with final reporting as of October 31, 2015. Recoveries, to the extent that claims were made, will continue to be shared through March 31, 2018 for the former Horizon Bank and September 30, 2018 for the former Home Valley Bank. The FDIC loss share coverage for single-family residential loans will continue for another three years. The outstanding principal balance of covered loans was $20,572,000 as of September 30, 2017 , as compared to $28,974,000 as of September 30, 2016 . The following table shows the year to date activity for the FDIC indemnification asset. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 (In thousands) Balance at beginning of year $ 12,769 $ 16,275 Payments received (584 ) (1,730 ) Amortization (3,450 ) (2,012 ) Accretion 232 236 Balance at end of year $ 8,967 $ 12,769

Allowance for Losses on Loans

Allowance for Losses on Loans	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Allowance for Losses on Loans	ALLOWANCE FOR LOSSES ON LOANS The following tables summarize the activity in the allowance for loan losses. Twelve Months Ended September 30, 2017 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 37,796 $ (1,229 ) $ 653 $ (328 ) $ 36,892 Construction 19,838 — — 4,718 24,556 Construction - custom 1,080 (16 ) — 880 1,944 Land - acquisition & development 6,023 (280 ) 11,038 (9,952 ) 6,829 Land - consumer lot loans 2,535 (17 ) 481 (350 ) 2,649 Multi-family 6,925 — — 937 7,862 Commercial real estate 8,588 (11 ) 1,684 1,557 11,818 Commercial & industrial 28,008 (173 ) 1,833 (1,144 ) 28,524 HELOC 813 (90 ) 21 111 855 Consumer 1,888 (884 ) 1,297 (1,157 ) 1,144 $ 113,494 $ (2,700 ) $ 17,007 $ (4,728 ) $ 123,073 Twelve Months Ended September 30, 2016 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 47,347 $ (3,106 ) $ 3,251 $ (9,696 ) $ 37,796 Construction 6,680 — 745 12,413 19,838 Construction - custom 990 (60 ) 60 90 1,080 Land - acquisition & development 5,781 (42 ) 8,220 (7,936 ) 6,023 Land - consumer lot loans 2,946 (732 ) 5 316 2,535 Multi-family 5,304 — — 1,621 6,925 Commercial real estate 8,960 (103 ) 1,812 (2,081 ) 8,588 Commercial & industrial 24,980 (941 ) 2,933 1,036 28,008 HELOC 902 (54 ) 21 (56 ) 813 Consumer 2,939 (962 ) 2,018 (2,107 ) 1,888 $ 106,829 $ (6,000 ) $ 19,065 $ (6,400 ) $ 113,494 The Company recorded a release of allowance for loan losses of $2,100,000 during the year ended September 30, 2017 , as compared to a release of $6,400,000 for the year ended September 30, 2016 . The credit quality of the portfolio has continued to improve and economic conditions remain relatively stable. The Company had recoveries, net of charge-offs, of $14,307,000 for the year ended September 30, 2017 , compared with net recoveries of $13,065,000 for the year ended September 30, 2016 . A loan is charged-off when the loss is estimable and it is confirmed that the borrower is not expected to be able to meet its contractual obligations. Non-accrual loans increased to $49,580,000 as of September 30, 2017 , from $42,414,000 as of September 30, 2016 . Non-performing assets (“NPAs”) totaled $70,238,000 , or 0.46% of total assets, at September 30, 2017 , compared to $71,441,000 , or 0.48% of total assets, as of September 30, 2016 . At September 30, 2017 , $122,947,000 of the allowance was calculated under the formulas contained in our general allowance methodology and the remaining $126,000 represents specific reserves on loans that were deemed to be impaired. The following tables show a summary of loans collectively and individually evaluated for impairment and the related allocation of general and specific reserves. September 30, 2017 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment General Reserve Allocation Recorded Investment of Loans Ratio Specific Reserve Allocation Recorded Investment of Loans Ratio (In thousands) (In thousands) Single-family residential $ 36,893 $ 5,713,576 0.7 % $ — $ 5,552 — % Construction 24,556 793,958 3.1 — — — Construction - custom 1,944 277,495 0.7 — 105 — Land - acquisition & development 6,828 104,767 6.5 1 89 1.0 Land - consumer lot loans 2,649 96,337 2.8 — 171 — Multi-family 7,857 1,302,625 0.6 5 493 1.0 Commercial real estate 11,697 1,391,668 0.8 120 21,765 0.6 Commercial & industrial 28,524 1,093,210 2.6 — 81 — HELOC 855 141,689 0.6 — 215 — Consumer 1,144 84,887 1.4 — 82 — $ 122,947 $ 11,000,212 1.1 % $ 126 $ 28,553 0.4 % September 30, 2016 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment General Reserve Allocation Recorded Investment of Loans Ratio Specific Reserve Allocation Recorded Investment of Loans Ratio (In thousands) (In thousands) Single-family residential $ 37,536 $ 5,585,912 0.7 % $ 260 $ 19,629 1.3 % Construction 19,838 498,450 4.0 — — — Construction - custom 1,080 229,298 0.5 — 330 — Land - acquisition & development 6,022 90,850 6.6 2 850 0.2 Land - consumer lot loans 2,535 92,828 2.7 — 558 — Multi-family 6,911 1,091,974 0.6 13 1,505 0.9 Commercial real estate 8,497 957,380 0.9 91 11,157 0.8 Commercial & industrial 28,008 966,930 2.9 — — — HELOC 813 133,203 0.6 — 239 — Consumer 1,888 137,315 1.4 — 3 — $ 113,128 $ 9,784,140 1.2 % $ 366 $ 34,271 1.1 % The Company has an asset quality review function that analyzes the loan portfolio and reports the results of the review to the Board of Directors on a quarterly basis. The single-family residential, HELOC and consumer portfolios are evaluated based on their performance as a pool of loans, since no single loan is individually significant or judged by its risk rating, size or potential risk of loss. The construction, land, multi-family, commercial real estate and commercial and industrial loans are risk rated on a loan by loan basis to determine the relative risk inherent in specific borrowers or loans. Based on that risk rating, the loans are assigned a grade and classified as follows: • Pass – the credit does not meet one of the definitions defined below. • Special mention – A special mention credit is considered to be currently protected from loss but is potentially weak. No loss of principal or interest is foreseen; however, proper supervision and management attention is required to deter further deterioration in the credit. Assets in this category constitute some undue and unwarranted credit risk but not to the point of justifying a risk rating of substandard. The credit risk may be relatively minor yet constitutes an unwarranted risk in light of the circumstances surrounding a specific asset. • Substandard – A substandard credit is an unacceptable credit. Additionally, repayment in the normal course is in jeopardy due to the existence of one or more well-defined weaknesses. In these situations, loss of principal is likely if the weakness is not corrected. A substandard asset is inadequately protected by the current sound worth and paying capacity of the borrower or of the collateral pledged, if any. Assets so classified will have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets risk rated substandard. • Doubtful – A credit classified doubtful has all the weaknesses inherent in one classified substandard with the added characteristic that the weakness makes collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The probability of loss is high, but because of certain important and reasonably specific pending factors that may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral and refinancing plans. • Loss – Credits classified loss are considered uncollectible and of such little value that their continuance as a bankable asset is not warranted. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather it is not practical or desirable to defer writing off this asset even though partial recovery may be affected in the future. Losses should be taken in the period in which they are identified as uncollectible. Partial charge-off versus full charge-off may be taken if the collateral offers some identifiable protection. The following tables provide information on loans based on credit quality indicators (defined above). September 30, 2017 Internally Assigned Grade Total Pass Special mention Substandard Doubtful Loss Gross Loans (In thousands) Loan type Single-family residential $ 5,671,229 $ — $ 39,775 $ — $ — $ 5,711,004 Construction 1,594,926 — 3,070 — — 1,597,996 Construction - custom 602,540 — 91 — — 602,631 Land - acquisition & development 123,028 207 1,073 — — 124,308 Land - consumer lot loans 103,787 — 618 — — 104,405 Multi-family 1,295,261 5,795 2,092 — — 1,303,148 Commercial real estate 1,391,996 5,944 36,670 — — 1,434,610 Commercial & industrial 1,054,972 14,814 23,574 — — 1,093,360 HELOC 144,229 — 621 — — 144,850 Consumer 84,984 — 91 — — 85,075 Total gross loans $ 12,066,952 $ 26,760 $ 107,675 $ — $ — $ 12,201,387 Total grade as a % of total gross loans 98.9 % 0.2 % 0.9 % — % — % September 30, 2016 Internally Assigned Grade Total Pass Special mention Substandard Doubtful Loss Gross Loans (In thousands) Loan type Single-family residential $ 5,607,521 $ — $ 51,309 $ — $ — $ 5,658,830 Construction 1,098,549 8,595 3,267 — — 1,110,411 Construction - custom 473,069 — — — — 473,069 Land - acquisition & development 111,225 — 7,272 — — 118,497 Land - consumer lot loans 103,528 — 1,039 — — 104,567 Multi-family 1,117,437 3,237 3,616 — — 1,124,290 Commercial real estate 1,033,880 13,446 46,313 — — 1,093,639 Commercial & industrial 930,776 7,207 40,606 — — 978,589 HELOC 149,195 — 521 — — 149,716 Consumer 138,917 — 83 — — 139,000 Total gross loans $ 10,764,097 $ 32,485 $ 154,026 $ — $ — $ 10,950,608 Total grade as a % of total gross loans 98.3 % 0.3 % 1.4 % — % — % The balance of loans internally graded as 'substandard' above includes $20,224,000 as of September 30, 2017 , and $35,910,000 as of September 30, 2016 of acquired loans and covered loans. The following tables provide information on loans based on payment activity. September 30, 2017 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands) (In thousands) Single-family residential $ 5,683,074 99.5 % $ 27,930 0.5 % Construction 1,597,996 100.0 — — Construction - custom 602,540 99.9 91 0.1 Land - acquisition & development 124,012 99.8 296 0.2 Land - consumer lot loans 103,800 99.4 605 0.6 Multi-family 1,303,009 99.9 139 0.1 Commercial real estate 1,422,795 99.2 11,815 0.8 Commercial & industrial 1,085,278 99.3 8,082 0.7 HELOC 144,319 99.6 531 0.4 Consumer 84,984 99.9 91 0.1 $ 12,151,807 99.6 % $ 49,580 0.4 % September 30, 2016 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands) (In thousands) Single-family residential $ 5,625,682 99.4 % $ 33,148 0.6 % Construction 1,110,411 100.0 — — Construction - custom 473,069 100.0 — — Land - acquisition & development 118,439 99.9 58 0.1 Land - consumer lot loans 104,057 99.5 510 0.5 Multi-family 1,123,583 99.9 776 0.1 Commercial real estate 1,086,470 99.3 7,100 0.7 Commercial & industrial 978,006 99.9 583 0.1 HELOC 149,477 99.8 239 0.2 Consumer 139,000 100.0 — — $ 10,908,194 99.6 % $ 42,414 0.4 % The following tables provide information on impaired loans by loan category. September 30, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 21,325 $ 23,880 $ — $ 19,371 Construction — — — — Construction - custom 148 165 — 231 Land - acquisition & development 330 8,208 — 176 Land - consumer lot loans 208 330 — 431 Multi-family 139 3,231 — 748 Commercial real estate 12,890 22,487 — 11,466 Commercial & industrial 8,279 14,321 — 7,425 HELOC 490 1,212 — 487 Consumer 88 1,433 — 57 43,897 75,267 — 40,392 Impaired loans with an allowance recorded: Single-family residential 181,941 186,167 4,030 204,723 Construction — — — — Construction - custom — — — — Land - acquisition & development 90 90 1 576 Land - consumer lot loans 7,949 8,526 — 8,976 Multi-family 493 493 5 1,024 Commercial real estate 15,079 16,707 120 16,991 Commercial & industrial — — — 297 HELOC 1,728 1,806 — 1,451 Consumer 97 284 — 100 207,377 214,073 4,156 (1) 234,138 Total: Single-family residential 203,266 210,047 4,030 224,094 Construction — — — — Construction - custom 148 165 — 231 Land - acquisition & development 420 8,298 1 752 Land - consumer lot loans 8,157 8,856 — 9,407 Multi-family 632 3,724 5 1,772 Commercial real estate 27,969 39,194 120 28,457 Commercial & industrial 8,279 14,321 — 7,722 HELOC 2,218 3,018 — 1,938 Consumer 185 1,717 — 157 $ 251,274 $ 289,340 $ 4,156 (1) $ 274,530 ____________________ (1) Includes $126,000 of specific reserves and $4,030,000 included in the general reserves. September 30, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (2) (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 9,627 $ 11,366 $ — $ 12,618 Construction — — — 91 Construction - custom — — — 603 Land - acquisition & development 138 9,001 — 720 Land - consumer lot loans 499 609 — 587 Multi-family 394 3,972 — 1,279 Commercial real estate 11,741 21,301 — 7,994 Commercial & industrial 1,030 3,082 — 1,205 HELOC 209 315 — 392 Consumer 74 550 — 236 23,712 50,196 — 25,725 Impaired loans with an allowance recorded: Single-family residential 228,186 232,595 3,809 238,187 Construction — — — 998 Construction - custom — — — — Land - acquisition & development 1,154 2,094 1 1,765 Land - consumer lot loans 9,630 10,678 1 10,330 Multi-family 1,505 1,505 13 2,159 Commercial real estate 19,434 22,848 91 20,998 Commercial & industrial — — — — HELOC 1,506 1,521 — 1,423 Consumer 116 306 — 100 261,531 271,547 3,915 (1) 275,960 Total: Single-family residential 237,813 243,961 3,809 250,805 Construction — — — 1,089 Construction - custom — — — 603 Land - acquisition & development 1,292 11,095 1 2,485 Land - consumer lot loans 10,129 11,287 1 10,917 Multi-family 1,899 5,477 13 3,438 Commercial real estate 31,175 44,149 91 28,992 Commercial & industrial 1,030 3,082 — 1,205 HELOC 1,715 1,836 — 1,815 Consumer 190 856 — 336 $ 285,243 $ 321,743 $ 3,915 (1) $ 301,685 ____________________ (1) Includes $366,000 of specific reserves and $3,549,000 included in the general reserves. (2) The average recorded investment changed from $265,771,000 , as previously disclosed, to $301,685,000 in order to correct for an immaterial error in the previous year's disclosure.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS ASC 820 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820 also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active exchange markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active and other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. We have established and documented the Company's process for determining the fair values of the Company's assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, fair value is determined using valuation models or third-party appraisals. The following is a description of the valuation methodologies used to measure and report the fair value of financial assets and liabilities on a recurring or nonrecurring basis. Measured on a Recurring Basis Available-for-sale investment securities and derivative contracts Securities available for sale are recorded at fair value on a recurring basis. The fair value of debt securities are priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and under GAAP are considered a Level 2 input method. Securities that are traded on active exchanges, including the Company's equity securities, are measured using the closing price in an active market and are considered a Level 1 input method. The Company offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the Company enters into the opposite trade with a counter party to offset its interest rate risk. The Company has also entered into a commercial loan hedge as well as long-term borrowing hedges using interest rate swaps. The fair value of these interest rate swaps are estimated by a third party pricing service using a discounted cash flow technique. These are considered a Level 2 input method. The following table presents the balance and level in the fair value hierarchy for assets and liabilities that are measured at fair value on a recurring basis. September 30, 2017 Level 1 Level 2 Level 3 Total (In thousands) Available-for-sale securities Equity securities $ 522 $ — $ — $ 522 U.S. government and agency securities — 211,077 — 211,077 Municipal bonds — 26,624 — 26,624 Corporate debt securities — 185,298 — 185,298 Mortgage-backed securities Agency pass-through certificates — 834,297 — 834,297 Commercial MBS — 8,391 — 8,391 Total Available-for-sale securities 522 1,265,687 — 1,266,209 Interest rate contracts — 1,139 — 1,139 Total Financial Assets $ 522 $ 1,266,826 $ — $ 1,267,348 Financial Liabilities Interest rate contracts $ — $ 1,139 $ — $ 1,139 Commercial loan hedges — 174 — 174 Long term borrowing hedges — 1,693 — 1,693 Total Financial Liabilities $ — $ 3,006 $ — $ 3,006 There were no transfers between, into and/or out of Levels 1, 2 or 3 during the year ended September 30, 2017 . September 30, 2016 Level 1 Level 2 Level 3 Total (In thousands) Available-for-sale securities Equity securities $ 101,824 $ — $ — $ 101,824 U.S. government and agency securities — 259,351 — 259,351 Municipal bonds — 27,670 — 27,670 Corporate debt securities — 461,138 — 461,138 Mortgage-backed securities Agency pass-through certificates — 993,041 — 993,041 Commercial MBS — 79,870 — 79,870 Total Available-for-sale securities 101,824 1,821,070 — 1,922,894 Interest rate contracts — 20,895 — 20,895 Total Financial Assets $ 101,824 $ 1,841,965 $ — $ 1,943,789 Financial Liabilities Interest rate contracts $ — $ 20,895 $ — $ 20,895 Commercial loan hedges — 3,312 — 3,312 Long term borrowing hedges — 31,347 — 31,347 Total Financial Liabilities $ — $ 55,554 $ — $ 55,554 There were no transfers between, into and/or out of Level 1, 2 or 3 during the year ended September 30, 2016 . Measured on a Nonrecurring Basis Impaired Loans & Real Estate Owned Real estate owned ("REO") consists principally of properties acquired through foreclosure. From time to time, and on a nonrecurring basis, adjustments using fair value measurements are recorded to reflect increases or decreases based on the current appraisal or estimated value of the collateral, but only up to the fair value of the real estate owned as of the initial transfer date less selling costs. When management determines that the fair value of the collateral or the real estate owned requires additional adjustments, either as a result of an updated appraised value or when there is no observable market price, the Company classifies the impaired loan or real estate owned as Level 3. Level 3 assets recorded at fair value on a nonrecurring basis represent impaired loans for which a specific reserve is recorded or a partial charge-off was recorded based on the fair value of collateral, as well as real estate owned where the fair value of the property was less than the cost basis. The following table presents the recorded balance of assets that were measured at estimated fair value on a nonrecurring basis for the periods presented, and the total gains (losses) resulting from those fair value adjustments for the periods presented. These estimated fair values are shown gross of estimated selling costs: September 30, 2017 Three Months Ended September 30, 2017 Twelve Months Ended September 30, 2017 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) Impaired loans (1) $ — $ — $ 9,088 $ 9,088 $ (250 ) $ (1,916 ) Real estate owned (2) — — 12,662 12,662 (376 ) (1,463 ) Balance at end of period $ — $ — $ 21,750 $ 21,750 $ (626 ) $ (3,379 ) ___________________ (1) The gains (losses) represent remeasurements of collateral-dependent impaired loans. (2) The gains (losses) represent aggregate writedowns and charge-offs on real estate owned. September 30, 2016 Three Months Ended September 30, 2016 Twelve Months Ended September 30, 2016 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) Impaired loans (1) $ — $ — $ 17,476 $ 17,476 $ (474 ) $ (4,236 ) Real estate owned (2) — — 25,190 25,190 (1,003 ) (3,947 ) Balance at end of period $ — $ — $ 42,666 $ 42,666 $ (1,477 ) $ (8,183 ) ___________________ (1) The gains (losses) represent remeasurements of collateral-dependent impaired loans. (2) The gains (losses) represent aggregate writedowns and charge-offs on real estate owned. The following describes the process used to value Level 3 assets measured on a nonrecurring basis: Impaired loans - The Company adjusts the carrying amount of impaired loans when there is evidence of probable loss and the expected fair value of the loan is less than its contractual amount. The amount of the impairment may be determined based on the estimated present value of future cash flows or the fair value of the underlying collateral. Impaired loans with a specific reserve allowance based on cash flow analysis or the value of the underlying collateral are classified as Level 3 assets. The evaluations for impairment are prepared by the Problem Loan Review Committee, which is chaired by the Chief Credit Officer and includes the Loan Review manager and Special Credits manager, as well as senior credit officers, division managers and group executives, as applicable. These evaluations are performed in conjunction with the quarterly allowance for loan loss process. Applicable loans that were included in the previous quarter's review are reevaluated and if their values are materially different from the prior quarter evaluation, the underlying information (loan balance and collateral value) are compared. Material differences are evaluated for reasonableness and discussions are held between the relationship manager and their division manager to understand the difference and determine if any adjustment is necessary. The inputs are developed and substantiated on a quarterly basis, based on current borrower developments, market conditions and collateral values. The following methods are used to value impaired loans: • The fair value of the collateral, which may take the form of real estate or personal property, is based on internal estimates, field observations, assessments provided by third-party appraisers and other valuation models. The Company performs or reaffirms valuations of collateral-dependent impaired loans at least annually. Adjustments are made if management believes that more recent information is available and relevant with respect to the fair value of the collateral. • The present value of the expected future cash flows of the loans is used for measurement of non collateral-dependent loans to test for impairment. The Company estimates the future cash flows and then discounts those using the contractual interest rate. Real estate owned - When a loan is reclassified from loan status to real estate owned due to the Company taking possession of the collateral, a Special Credits officer, along with the Special Credits manager, obtains a valuation, which may include appraisals or third-party price options, which is used to establish the fair value of the underlying collateral. The determined fair value, less selling costs, becomes the carrying value of the REO asset. Fair Values of Financial Instruments U. S. GAAP requires disclosure of fair value information about financial instruments, whether or not recognized on the statement of financial condition, for which it is practicable to estimate those values. Certain financial instruments and all non-financial instruments are excluded from the disclosure requirements. Accordingly, the aggregate fair value estimates presented do not reflect the underlying fair value of the Company. Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below. September 30, 2017 September 30, 2016 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value (In thousands) Financial assets Cash and cash equivalents 1 $ 313,070 $ 313,070 $ 450,368 $ 450,368 Available-for-sale securities: Equity securities 1 522 522 101,824 101,824 U.S. government and agency securities 2 211,077 211,077 259,351 259,351 Municipal bonds 2 26,624 26,624 27,670 27,670 Corporate debt securities 2 185,298 185,298 461,138 461,138 Mortgage-backed securities Agency pass-through certificates 2 834,297 834,297 993,041 993,041 Commercial MBS 2 8,391 8,391 79,870 79,870 Total available-for-sale securities 1,266,209 1,266,209 1,922,894 1,922,894 Held-to-maturity securities: Mortgage-backed securities Agency pass-through certificates 2 1,646,856 1,635,913 1,417,599 1,441,556 Total held-to-maturity securities 1,646,856 1,635,913 1,417,599 1,441,556 Loans receivable 3 10,882,622 11,247,586 9,910,920 10,414,794 FDIC indemnification asset 3 8,968 8,564 12,769 12,095 FHLB and FRB stock 2 122,990 122,990 117,205 117,205 Other assets - interest rate contracts 2 1,139 1,139 20,895 20,895 Financial liabilities Customer accounts 2 10,835,008 10,411,686 10,600,852 10,184,321 FHLB advances and other borrowings 2 2,225,000 2,266,791 2,080,000 2,184,671 Other liabilities - interest rate contracts 2 1,139 1,139 20,895 20,895 Other liabilities - commercial loan hedges 2 174 174 3,312 3,312 Other liabilities - long term borrowing hedges 2 1,693 1,693 31,347 31,347 The following methods and assumptions were used to estimate the fair value of financial instruments: Cash and cash equivalents – The carrying amount of these items is a reasonable estimate of their fair value. Available-for-sale securities and held-to-maturity securities – Securities at fair value are primarily priced using model pricing based on the securities' relationship to other benchmark quoted prices as provided by an independent third party, and are considered a Level 2 input method. Equity securities which are exchange traded are considered a Level 1 input method. Loans receivable – For certain homogeneous categories of loans, such as fixed- and variable-rate residential mortgages, fair value is estimated for securities backed by similar loans, adjusted for differences in loan characteristics, using the same methodology described above for AFS and HTM securities. The fair value of other loan types is estimated by discounting the future cash flows and estimated prepayments using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining term. Some loan types were valued at carrying value because of their floating rate or expected maturity characteristics. Net deferred loan fees are not included in the fair value calculation but are included in the carrying amount. FDIC indemnification asset – The fair value of the indemnification asset is estimated by discounting the expected future cash flows using the current rates. FHLB and FRB stock – The fair value is based upon the par value of the stock which equates to its carrying value. Customer accounts – The fair value of demand deposits, savings accounts, and money market accounts is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated by discounting the estimated future cash flows using the rates currently offered for deposits with similar remaining maturities. FHLB advances – The fair value of FHLB advances and other borrowings is estimated by discounting the estimated future cash flows using rates currently available to the Company for debt with similar remaining maturities. Interest Rate Contracts – The Bank offers interest rate swaps to its variable rate borrowers who want to manage their interest rate risk. At the same time, the bank enters into the opposite trade with a counterparty to offset its interest rate risk. The fair value of these interest rate swaps are estimated by a third-party pricing service using a discounted cash flow technique. Commercial Loan Hedges – The fair value of the interest rate swaps are estimated by a third-party pricing service using a discounted cash flow technique. Long Term Borrowing Hedges – The fair value of the interest rate swaps are estimated by a third-party pricing service using a discounted cash flow technique.

Derivatives and Hedging Activit

Derivatives and Hedging Activities Derivatives and Hedging Activities	12 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	DERIVATIVES AND HEDGING ACTIVITIES The Company periodically enters into certain interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rate payments, while the Company retains a variable rate loan. Under these agreements, the Company enters into a variable rate loan agreement and a swap agreement with the client. The swap agreement effectively converts the client’s variable rate loan into a fixed rate. The Company enters into a corresponding swap agreement with a third party in order to offset its exposure on the variable and fixed components of the client's swap agreement. The Company had $1,035,573,000 and $840,935,000 notional in interest rate swaps to hedge this exposure as of September 30, 2017 , and September 30, 2016 , respectively. As of September 30, 2017 , $33,645,000 of the outstanding notional balance related to a related party loan. The interest rate swaps are derivatives under FASB ASC 815, Derivatives and Hedging, with changes in fair value recorded in earnings. There was no net impact to the statement of operations for the years ended September 30, 2017 , and September 30, 2016 as the changes in value for the asset and liability side of the swaps offset each other. The Company has also entered into interest rate swaps, some of which are forward-starting, to convert certain existing and future short-term borrowings to fixed rate payments. The primary purpose of these hedges is to mitigate the risk of rising interest rates, specifically LIBOR rates, which are a benchmark for the short-term borrowings. The hedging program qualifies as a cash flow hedge under ASC 815, which provides for offsetting of the recognition of gains and losses of the interest rate swaps and the hedged items. The hedged item is the LIBOR portion of the series of existing or future short-term fixed rate borrowings over the term of the interest rate swap. The change in the fair value of the interest rate swaps is recorded in other comprehensive income. The Company had $700,000,000 and $700,000,000 notional in interest rate swaps to hedge existing and anticipated future borrowings as of September 30, 2017 , and September 30, 2016 , respectively. The unrealized loss, gross of the related tax benefit, on these interest rate swaps as of September 30, 2017 , was $1,693,000 . The Company has also entered into an interest rate swap to hedge the interest rate risk of an individual fixed rate commercial loan and this relationship qualifies as a fair value hedge under ASC 815, which provides for offsetting of the recognition of gains and losses of the interest rate swap and the hedged item. The Company hedges the interest rate risk of this loan using a swap with a notional amount of $52,936,000 and $54,155,000 as of September 30, 2017 , and September 30, 2016 , respectively. The following table presents the fair value and balance sheet classification of derivatives outstanding. Asset Derivatives Liability Derivatives September 30, 2017 September 30, 2016 September 30, 2017 September 30, 2016 (In thousands) Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Interest rate contracts Other assets $ 1,139 Other assets $ 20,895 Other liabilities $ 1,139 Other liabilities $ 20,895 Commercial loan hedges Other assets — Other assets — Other liabilities 174 Other liabilities 3,312 Long term borrowing hedges Other assets — Other assets — Other liabilities 1,693 Other liabilities 31,347 $ 1,139 $ 20,895 $ 3,006 $ 55,554

Interest Receivable

Interest Receivable	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Interest Receivable	INTEREST RECEIVABLE The following table provides a summary of interest receivable by interest earning asset type. September 30, 2017 September 30, 2016 (In thousands) Loans receivable $ 33,688 $ 29,858 Mortgage-backed securities 6,049 5,670 Investment securities 1,906 2,141 $ 41,643 $ 37,669 Interest receivable was $41,643,000 at September 30, 2017 , as compared to $37,669,000 as of September 30, 2016 . The increase was primarily a result of the 9.8% rise in loans receivable.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT The following table provides a summary of premises and equipment by asset type. September 30, 2017 September 30, 2016 Estimated Useful Life (In thousands) Land — $ 102,381 $ 109,414 Buildings 25 - 40 149,805 143,841 Leasehold improvements 7 - 15 18,587 18,365 Furniture, software and equipment 2 - 10 119,518 115,199 390,291 386,819 Less accumulated depreciation and amortization (126,597 ) (104,868 ) $ 263,694 $ 281,951 The Company has non-cancelable operating leases for certain branch offices. Future minimum net rental commitments for all non-cancelable leases, including maintenance and associated costs, are as follows: $5,956,000 for 2018 , $5,107,000 for 2019 , $4,923,000 for 2020 , $4,276,000 for 2021 , $3,750,000 for 2022 and $17,005,000 thereafter. Rental expense, including amounts paid under month-to-month cancelable leases, amounted to $5,500,000 , $5,300,000 and $6,600,000 in 2017 , 2016 , and 2015 , respectively.

Customer Accounts

Customer Accounts	12 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Customer Accounts	CUSTOMER ACCOUNTS The following table provides the composition of the Company's customer accounts, including interest rate buckets and maturity buckets for time deposits. September 30, 2017 September 30, 2016 (In thousands) Checking accounts, 0.15% and under $ 3,019,095 $ 2,721,721 Savings accounts, 0.10% and under 888,881 820,980 Money market accounts, 0.01% to 0.15% 2,453,182 2,462,891 Time deposit accounts Less than 1.00% 2,204,756 3,268,272 1.00% to 1.99% 2,099,841 1,292,612 2.00% to 2.99% 169,253 34,376 Total time deposits 4,473,850 4,595,260 $ 10,835,008 $ 10,600,852 Time deposit maturities are as follows: September 30, 2017 September 30, 2016 (In thousands) Within 1 year $ 2,553,712 $ 2,894,900 1 to 2 years 975,351 798,309 2 to 3 years 386,763 293,058 Over 3 years 558,024 608,993 $ 4,473,850 $ 4,595,260 Customer accounts over $250,000 totaled $2,674,914,000 as of September 30, 2017 , and $2,250,622,000 as of September 30, 2016 . Interest expense on customer accounts consisted of the following: Year ended September 30, 2017 2016 2015 (In thousands) Checking accounts $ 2,721 $ 1,491 $ 1,036 Savings accounts 978 734 660 Money market accounts 3,592 3,285 3,631 Time deposit accounts 45,256 47,425 46,273 52,547 52,935 51,600 Less early withdrawal penalties (524 ) (450 ) (546 ) $ 52,023 $ 52,485 $ 51,054 Weighted average interest rate at end of year 0.54 % 0.50 % 0.48 % Weighted daily average interest rate during the year 0.49 % 0.50 % 0.48 %

FHLB Advances and Other Borrowi

FHLB Advances and Other Borrowings	12 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
FHLB Advances and Other Borrowings	FHLB ADVANCES AND OTHER BORROWINGS The table below shows the maturity dates of outstanding FHLB advances. September 30, 2017 September 30, 2016 (In thousands) FHLB advances Within 1 year $ 1,395,000 $ 200,000 1 to 3 years 430,000 880,000 3 to 5 years 400,000 700,000 More than 5 years — 300,000 $ 2,225,000 $ 2,080,000 There were no advances included in the above table that are callable by the FHLB. Financial data pertaining to the weighted-average cost and the amount of FHLB advances were as follows. 2017 2016 2015 (In thousands) Weighted average interest rate, net of cash flow hedges, at end of year 2.80 % 3.15 % 3.35 % Weighted daily average interest rate, net of cash flow hedges, during the year 3.00 % 3.22 % 3.57 % Daily average of FHLB advances during the year $ 2,167,986 $ 1,992,434 $ 1,848,904 Maximum amount of FHLB advances at any month end $ 2,350,000 $ 2,080,000 $ 1,930,000 Interest expense during the year (excludes interest rate swap expense) $ 64,968 $ 64,058 $ 64,331 The Bank has a credit line with the Federal Home Loan Bank of Des Moines ("FHLB") equal to 48% of total assets. The Bank has entered into borrowing agreements with the FHLB to borrow funds under a short-term floating rate cash management advance program and a fixed-rate term loan agreements. All borrowings are secured by stock of the FHLB, deposits with the FHLB and a blanket pledge of qualifying loans receivable as provided in the agreements with the FHLB.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The table below provides a summary of the Company's tax assets and liabilities, including deferred tax assets and deferred tax liabilities by major source. Deferred tax balances represent temporary differences between the tax basis and the financial statement carrying amounts of assets and liabilities. September 30, 2017 September 30, 2016 (In thousands) Deferred tax assets Loan loss reserves $ 50,411 $ 45,531 REO reserves 1,693 4,018 Valuation adjustment on available-for-sale securities and cash flow hedges — 6,482 Non-accrual loan interest 2,262 2,812 FDIC assisted transactions 12,236 9,598 Federal and state tax credits 3,939 1,791 Deferred compensation 3,037 2,359 Stock based compensation 2,259 925 Other 1,274 625 Total deferred tax assets 77,111 74,141 Deferred tax liabilities FHLB stock dividends 24,135 24,135 Valuation adjustment on available-for-sale securities and cash flow hedges 2,914 — Loan origination fees and costs 13,643 14,826 Premises and equipment 35,950 34,936 Other 2,145 5,320 Total deferred tax liabilities 78,787 79,217 Net deferred tax asset (liability) (1,676 ) (5,076 ) Current tax asset (liability) (3,920 ) 21,123 Net tax asset (liability) $ (5,596 ) $ 16,047 The table below presents a reconciliation of the statutory federal income tax rate to the Company's effective income tax rate. Year ended September 30, 2017 2016 2015 Statutory income tax rate 35 % 35 % 35 % State income tax 1 1 2 Other differences (4 ) (2 ) (1 ) Effective income tax rate 32 % 34 % 36 % The following table summarizes the Company's income tax expense (benefit) for the respective periods. Year ended September 30, 2017 2016 2015 (In thousands) Federal: Current $ 87,804 $ 57,173 $ 79,841 Deferred (10,142 ) 21,961 3,244 77,662 79,134 83,085 State: Current $ 4,991 $ 3,600 $ 6,636 Deferred 31 1,351 (518 ) 5,022 4,951 6,118 Total Current 92,795 60,773 86,477 Deferred (10,111 ) 23,312 2,726 $ 82,684 $ 84,085 $ 89,203 Based on current information the Company does not expect that changes in the amount of unrecognized tax benefits over the next 12 months will have a significant impact on its results of operations or financial position. The Company's liability for uncertain tax positions was $104,000 as of September 30, 2017 , and $105,000 as of September 30, 2016 . These amounts, if recognized, would affect the Company's effective tax rate. The Company records interest and penalties related to uncertain tax positions in income tax expense. The Company's federal income tax returns are open for the tax years 2013 forward. The Company has been examined by the Internal Revenue Service through the year ended September 30, 2012. State income tax returns are generally subject to examination for a period of three to five years after filing of the respective return. The state impact of any federal changes remains subject to examination by various states for a period of up to two years after formal notification to the states. The Company's unrecognized tax benefits are related to state tax returns open from 2013 through 2017 .

401(k) and Employee Stock Owner

401(k) and Employee Stock Ownership Plan	12 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
401(k) and Employee Stock Ownership Plan	401(k) AND EMPLOYEE STOCK OWNERSHIP PLAN The Company maintains a 401(k) and Employee Stock Ownership Plan (the "Plan") for the benefit of its employees. Company contributions are made annually as approved by the Board of Directors. Such amounts are not in excess of amounts permitted by the Employee Retirement Income Security Act of 1974. Plan participants may make voluntary after-tax contributions of their considered earnings as defined by the Plan. In addition, participants may make pre-tax contributions up to the statutory limits through the 401(k) provisions of the Plan. The annual addition from contributions to an individual participant's account in this Plan cannot exceed the lesser of 100% of base salary or $54,000 . Effective January 1, 2016, new employees become eligible to participate in the Plan upon completion of one year of service. Such eligible employees become a participant in the Plan on the first day of the calendar quarter (January 1, April 1, July 1 or October 1) coincident with or following the completion of the one year of service requirement. The Plan defines “year of service” as a 12-month period in which the eligible employee works at least 1,000 hours of service and the first eligibility service period starts on the first day of employment. After the first 12-month eligibility service period, if the Plan needs to measure another eligibility service period (e.g., if the employee does not complete 1,000 hours of service in the first 12-month period), the Plan will measure the eligibility service period on a Plan Year basis. Effective January 1, 2014, the Company added a guaranteed safe harbor matching contribution component to the plan equal to 100% of the first 4% of compensation that employees contribute to their account. In addition to the new match being guaranteed, all safe harbor matching contributions are immediately vested. The new match is not subject to the six year vesting schedule of the current profit sharing contribution. This provides plan participants more investment flexibility. The Company anticipates that all eligible employees, regardless of personal plan participation, will continue to receive an annual discretionary profit sharing contribution from the Company, now capped at 7% of eligible compensation with this change. Company contributions to the Plan amounted to $6,433,000 , $7,600,000 and $8,700,000 for the years ended 2017 , 2016 and 2015 , respectively.

Stock Award Plans

Stock Award Plans	12 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Award Plans	STOCK AWARD PLANS The Company's stock based compensation plan ("2011 Incentive Plan") provides for grants of stock options and restricted stock. Stockholders authorized 5,000,000 shares of common stock to be reserved pursuant to the 2011 Incentive Plan and 3,113,050 shares remain available for issuance as of September 30, 2017 . When applicable, stock options are granted with an exercise price equal to the market price of the Company's stock at the date of grant; those option awards generally vest based on five years of continuous service and have 10 -year contractual terms. The Company's policy is to issue new shares upon option exercises. The fair value of stock options granted is estimated on the date of grant using the Black-Scholes option-pricing model. Additionally, there may be other factors that would otherwise have a significant effect on the value of employee stock options granted but are not considered by the model. Expected volatility is based on the historical volatility of the Company's stock. The risk-free interest rate is based on the U.S. Treasury yield curve that is in effect at the time of grant with a remaining term equal to the options' expected life. The expected term represents the period of time that options granted are expected to be outstanding. Stock Option Awards: There were no stock options granted under the 2011 Incentive Plan during 2017 , 2016 and 2015 . A summary of stock option activity and changes during the year are as follows. Options Shares Weighted Weighted Aggregate Outstanding at September 30, 2016 459,443 $ 21.47 2 $2,392 Exercised (311,168 ) 22.83 Forfeited (25,745 ) 18.61 Outstanding at September 30, 2017 122,530 $ 18.64 2 $ 1,839 Exercisable at September 30, 2017 122,530 $ 18.64 2 $ 1,839 The table below presents other information regarding stock options. Year ended September 30, 2017 2016 2015 (In thousands, except fair value of options granted) Compensation cost for stock options $ — $ 89 $ 232 Weighted average grant date fair value per stock option 3.06 2.73 2.96 Total intrinsic value of options exercised 2,605 1,651 831 Grant date fair value of options exercised 1,328 1,422 368 Cash received from option exercises 7,238 9,283 2,070 The following is a summary of activity related to unvested stock options. Year ended September 30, 2017 2016 2015 Non-vested Stock Options Options Outstanding Weighted Options Outstanding Weighted Options Outstanding Weighted Outstanding at beginning of period — $ — 69,287 $ 3.85 145,795 $ 3.87 Vested — — (62,227 ) 3.91 (61,018 ) 3.88 Forfeited — — (7,060 ) 3.89 (15,490 ) 3.90 Outstanding at end of period — $ — — $ — 69,287 $ 3.85 As of September 30, 2017 , there was no remaining unrecognized compensation cost for stock options. Restricted Stock Awards: The Company grants shares of restricted stock pursuant to the 2011 Incentive Plan. The restricted stock grants are subject to a service condition and vest over a period of one to seven years. Certain grants of restricted stock to executive officers are also subject to additional performance conditions based upon meeting certain total shareholder return targets pre-established by the Board. The Company had a total of 466,681 shares of restricted stock outstanding as of September 30, 2017 , with a fair market value at the date of grant of $8,661,599 . The following table summarizes information about unvested restricted stock activity. Year ended September 30, 2017 2016 2015 Non-vested Restricted Stock Outstanding Weighted Outstanding Weighted Outstanding Weighted Outstanding at beginning of period 490,363 $ 16.00 521,302 $ 15.03 515,845 $ 14.10 Granted 238,450 18.89 229,450 $ 17.20 301,750 14.26 Vested (116,878 ) 20.95 (165,965 ) 15.96 (223,043 ) 13.24 Forfeited (145,254 ) 8.56 (94,424 ) 13.64 (73,250 ) 10.72 Outstanding at end of period 466,681 $ 18.56 490,363 $ 16.00 521,302 $ 15.03 Compensation expense related to restricted stock awards was $3,658,539 , $3,357,108 , and $3,271,564 for the years ended 2017 , 2016 and 2015 , respectively.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY The Company and the Bank are subject to various regulatory capital requirements. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the following table) of Common Equity Tier 1, Tier 1 and Total capital to risk weighted assets (as defined in the regulations) and Tier 1 capital to average assets (as defined in the regulations). Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on the Company's financial statements. The Company and the Bank are also subject to certain restrictions on the amount of dividends that they may declare without prior regulatory approval. As of September 30, 2017 , and 2016 , the Company and the Bank met all capital adequacy requirements to which they are subject, and the OCC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum Common Equity Tier 1, Tier 1 risk-based, Total risk-based and Tier 1 leverage ratios as set forth in the following table. The Bank's actual capital amounts and ratios as of these dates are also presented. There are no conditions or events since that management believes have changed the Bank's categorization. Actual Capital Adequacy Categorized as Well Capitalized Under Prompt Corrective Action Provisions Capital Ratio Ratio Ratio September 30, 2017 (In thousands) Common Equity Tier 1 risk-based capital ratio: The Company $ 1,701,327 16.67 % 4.50 % NA The Bank 1,668,314 16.35 4.50 6.50 % Tier 1 risk-based capital ratio: The Company 1,701,327 16.67 6.00 NA The Bank 1,668,314 16.35 6.00 8.00 Total risk-based capital ratio: The Company 1,828,935 17.92 8.00 NA The Bank 1,795,929 17.60 8.00 10.00 Tier 1 leverage ratio: The Company 1,701,327 11.49 4.00 NA The Bank 1,668,314 11.27 4.00 5.00 September 30, 2016 Common Equity Tier 1 risk-based capital ratio: The Company $ 1,690,380 17.54 % 4.50 % NA The Bank 1,668,828 17.32 4.50 6.50 % Tier 1 risk-based capital ratio: The Company 1,690,380 17.54 6.00 NA The Bank 1,668,828 17.32 6.00 8.00 Total risk-based capital ratio: The Company 1,807,740 18.76 8.00 NA The Bank 1,786,188 18.54 8.00 10.00 Tier 1 leverage ratio: The Company 1,690,380 11.60 4.00 NA The Bank 1,668,828 11.45 4.00 5.00 At periodic intervals, the Federal Reserve, the OCC and the FDIC routinely examine the Company's and the Bank's financial statements as part of their oversight. Based on their examinations, these regulators can direct that the Company's or Bank's financial statements be adjusted in accordance with their findings. The Company and the Bank are subject to regulatory restrictions on paying dividends. The Company has an ongoing share repurchase program and 3,137,178 shares were repurchased during 2017 at a weighted average price of $31.36 . In 2016 , 3,867,563 shares were repurchased at a weighted average price of $22.72 . As of September 30, 2017 , management had authorization from the Board of Directors to repurchase up to 1,902,412 additional shares. In connection with the 2008 Troubled Asset Relief Program ("TARP"), the Company issued 1,707,456 warrants to purchase common stock at an exercise price of $17.57 . In 2017 , the Company repurchased 478,399 of these warrants with a value of $7,631,576 . Warrants remaining outstanding were 330,217 as of September 30, 2017 , and 808,616 as of September 30, 2016 , and they have an expiration date of November 14, 2018. The outstanding warrants are considered in the calculation of diluted shares outstanding using the treasury stock method. The following table sets forth information regarding earnings per share calculations. Year ended September 30, 2017 2016 2015 Weighted average shares outstanding 88,905,457 91,399,038 95,644,639 Weighted average dilutive warrants 242,979 440,366 340,016 Weighted average dilutive options 75,771 73,514 69,304 Weighted average diluted shares 89,224,207 91,912,918 96,053,959 Net income (In thousands) $ 173,532 $ 164,049 $ 160,316 Basic EPS $ 1.95 $ 1.79 $ 1.68 Diluted EPS 1.94 1.78 1.67

Financial Information - Washing

Financial Information - Washington Federal, INC.	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Financial Information - Washington Federal, INC.	FINANCIAL INFORMATION – WASHINGTON FEDERAL, INC. The following Washington Federal, Inc. (parent company only) financial information should be read in conjunction with the other notes to the Consolidated Financial Statements. Condensed Statements of Financial Condition September 30, 2017 September 30, 2016 (In thousands) Assets Cash $ 33,077 $ 24,300 Other assets — 15 Investment in subsidiary 1,972,675 1,954,179 Total assets $ 2,005,752 $ 1,978,494 Liabilities Other liabilities $ 64 $ 2,763 Total liabilities 64 2,763 Stockholders’ equity Total stockholders’ equity 2,005,688 1,975,731 Total liabilities and stockholders’ equity $ 2,005,752 $ 1,978,494 Condensed Statements of Operations Twelve Months Ended September 30, 2017 2016 2015 (In thousands) Income Dividends from subsidiary $ 171,500 $ 148,000 $ 175,000 Total Income 171,500 148,000 175,000 Expense Miscellaneous 435 435 439 Total expense 435 435 439 Net income (loss) before equity in undistributed net income (loss) of subsidiary 171,065 147,565 174,561 Equity in undistributed net income of subsidiary 2,326 16,336 (14,402 ) Income before income taxes 173,391 163,901 160,159 Income tax benefit (expense) 141 148 157 Net income $ 173,532 $ 164,049 $ 160,316 Condensed Statements of Cash Flows Twelve Months Ended September 30, 2017 2016 2015 (In thousands) Cash Flows From Operating Activities Net income $ 173,532 $ 164,049 $ 160,316 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed net income (loss) of subsidiaries 3,584 (12,677 ) 32,375 Decrease (increase) in other assets 15 (15 ) — Increase (decrease) in other liabilities (2,699 ) 1,552 (13,189 ) Net cash provided by (used in) operating activities 174,432 152,909 179,502 Cash Flows From Financing Activities Proceeds from exercise of common stock options and related tax benefit 7,238 9,283 2,070 Warrants purchased — (7,744 ) — Treasury stock purchased (98,374 ) (87,850 ) (126,728 ) Dividends paid on common stock (74,519 ) (49,926 ) (51,111 ) Net cash provided by (used in) financing activities (165,655 ) (136,237 ) (175,769 ) Increase (decrease) in cash 8,777 16,672 3,733 Cash at beginning of year 24,300 7,628 3,895 Cash at end of year $ 33,077 $ 24,300 $ 7,628

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) The following is a summary of the unaudited interim results of operations by quarter for the years presented. Twelve Months Ended September 30, 2017 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share data) Interest income $ 132,764 $ 136,198 $ 137,716 $ 142,240 Interest expense 29,612 28,471 29,101 29,808 Net interest income 103,152 107,727 108,615 112,432 Provision (release) for loan losses — (1,600 ) — (500 ) Other operating income (including REO gain (loss), net) 12,294 10,931 13,798 16,686 Other operating expense 54,341 57,467 57,062 62,649 Income before income taxes 61,105 62,791 65,351 66,969 Income tax expense 19,859 20,721 21,239 20,865 Net income $ 41,246 $ 42,070 $ 44,112 $ 46,104 Basic earnings per share $ 0.46 $ 0.47 $ 0.49 $ 0.53 Diluted earnings per share 0.46 0.47 0.49 0.52 Cash dividends paid per share 0.14 0.40 0.15 0.15 Twelve Months Ended September 30, 2016 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share data) Interest income $ 135,124 $ 135,063 $ 133,735 $ 132,872 Interest expense 28,255 28,738 29,495 30,056 Net interest income 106,869 106,325 104,240 102,816 Provision (release) for loan losses — (1,500 ) (1,650 ) (3,100 ) Other operating income (REO expense) 12,055 14,623 15,573 14,830 Other operating expense 64,509 59,226 56,305 55,407 Income before income taxes 54,415 63,222 65,158 65,339 Income tax expense 19,317 21,499 22,154 21,115 Net income $ 35,098 $ 41,723 $ 43,004 $ 44,224 Basic earnings per share $ 0.38 $ 0.45 $ 0.47 $ 0.49 Diluted earnings per share 0.38 0.45 0.47 0.49 Cash dividends paid per share 0.13 0.14 0.14 0.14

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Fiscal period	The Company's fiscal year end is September 30. All references to 2017 , 2016 and 2015 represent balances as of September 30, 2017 , September 30, 2016 , and September 30, 2015 , or activity for the fiscal years then ended.
Cash and cash equivalents	Cash and cash equivalents. Cash and cash equivalents include cash on hand, amounts due from banks, overnight investments and repurchase agreements with an initial maturity of three months or less.
Investments and mortgage-backed securities	Investments and mortgage-backed securities. The Company accounts for investments and mortgage-backed securities in two categories: held-to-maturity and available-for-sale. Premiums and discounts on investments are deferred and recognized into income over the contractual life of the asset using the effective interest method. Held-to-maturity securities are accounted for at amortized cost, but the Company must have both the positive intent and the ability to hold those securities to maturity. There are very limited circumstances under which securities in the held-to-maturity category can be sold without jeopardizing the cost basis of accounting for the remainder of the securities in this category. Available-for-sale securities are accounted for at fair value. Gains and losses realized on the sale of these securities are accounted for based on the specific identification method. Unrealized gains and losses for available-for-sale securities are excluded from earnings and reported net of the related tax effect in the accumulated other comprehensive income component of stockholders' equity. Realized gains and losses on securities sold as well as other than temporary impairment charges, if any, are shown on the Consolidated Statements of Operations under the Other Income heading. Management evaluates debt and equity securities for other than temporary impairment on a quarterly basis based on the securities' current credit quality, market interest rates, term to maturity and management's intent and ability to hold the securities until the net book value is recovered.
Loans receivable	Loans receivable. Loans that are performing in accordance with their contractual terms are carried at the unpaid principal balance, net of premiums, discounts and net deferred loan fees. Net deferred loan fees include nonrefundable loan origination fees less direct loan origination costs. Net deferred loan fees, premiums and discounts are amortized into interest income using either the interest method or straight-line method over the terms of the loans, adjusted for actual prepayments. In addition to fees and costs for originating loans, various other fees and charges related to existing loans may occur, including prepayment charges, late charges and assumption fees. When a borrower fails to make a required payment on a loan, the Bank attempts to cure the deficiency by contacting the borrower. Contact is made after a payment is 30 days past its grace period. In most cases, deficiencies are cured promptly. If the delinquency is not cured within 90 days, the Bank may institute appropriate action to foreclose on the property. If foreclosed, the property is sold at a public sale and may be purchased by the Bank. Restructured loans. The Bank will consider modifying the interest rates and terms of a loan if it determines that a modification is a better alternative to foreclosure. Most troubled debt restructured ("TDR") loans are accruing and performing loans where the borrower has proactively approached the Bank about modifications due to temporary financial difficulties. Each request is individually evaluated for merit and likelihood of success. The concession for these loans is typically a payment reduction through a rate reduction of 100 to 200 bps for a specific term, usually six to 12 months. Interest-only payments may also be approved during the modification period. Principal forgiveness is generally not an available option for restructured loans. Before granting approval to modify a loan in a TDR, the borrower’s ability to repay is evaluated, including: current income levels and debt to income ratio, borrower’s credit score, payment history of the loan and updated evaluation of the secondary repayment source. The Bank also modifies some loans that are not classified as TDRs as the modification is due to a restructuring where the effective interest rate on the debt is reduced to reflect a decrease in market interest rates. Non-accrual loans. Loans are placed on nonaccrual status when, in the judgment of management, the probability of collection of interest is deemed to be insufficient to warrant further accrual. When a loan is placed on nonaccrual status, previously accrued but unpaid interest is deducted from interest income. The Bank does not accrue interest on loans 90 days or more past due. If payment is made on a loan so that the loan becomes less than 90 days past due, and the Bank expects full collection of principal and interest, the loan is returned to full accrual status. Any interest ultimately collected is credited to income in the period of recovery. A loan is charged-off when the loss is estimable and it is confirmed that the borrower is not expected be able to meet contractual obligations. If a consumer loan is on non-accrual status before becoming a TDR it will stay on non-accrual status following restructuring until it has been performing for at least six months, at which point it may be moved to accrual status. If a loan is on accrual status before it becomes a TDR, and management concludes that full repayment is probable based on internal evaluation, it will remain on accrual status following restructuring. If the restructured consumer loan does not perform, it is placed on non-accrual status when it is 90 days delinquent. For commercial loans, six consecutive payments on newly restructured loan terms are required prior to returning the loan to accrual status. In some instances, after the required six consecutive payments are made, management will conclude that collection of the entire principal and interest due is still in doubt. In those instances, the loan will remain on non-accrual. Impaired loans. Impaired loans consist of loans receivable that are not expected to have their principal and interest repaid in accordance with their contractual terms. Collateral-dependent impaired loans are measured using the fair value of the collateral less selling costs. Non-collateral dependent loans are measured at the present value of expected future cash flows. Allowance for loan losses. The Bank maintains an allowance for loan losses to absorb losses inherent in the loan portfolio. The allowance is based on ongoing, quarterly assessments of the probable and estimable losses inherent in the loan portfolio. The Bank's general methodology for assessing the appropriateness of the allowance is to apply a loss percentage factor to the different loan types. The loss percentage factor is made up of two parts - the historical loss factor (“HLF”) and the qualitative loss factor (“QLF”). The HLF takes into account historical charge-offs by loan type. The Bank uses an average of historical loss rates for each loan category multiplied by a loss emergence period. This is the likely period of time during which a residential or commercial loan borrower experiencing financial difficulties might deplete their cash prior to becoming delinquent on their loan, plus the period of time that it takes the Bank to work out the loans. The QLF are based on management's continuing evaluation of the pertinent factors underlying the quality of the loan portfolio, including changes in the size and composition of the loan portfolio, actual loan loss experience, current economic conditions, collateral values, geographic concentrations, seasoning of the loan portfolio, specific industry conditions and the duration of the current business cycle. These factors are considered by loan type. Specific allowances are established for loans which are individually evaluated, in cases where management has identified significant conditions or circumstances related to a loan that management believes indicate the probability that a loss has been incurred. The Bank has also established a reserve for unfunded commitments. The recovery of the carrying value of loans is susceptible to future market conditions beyond the Bank's control, which may result in losses or recoveries differing from those estimated. Covered assets. Covered loans consist of single-family loans acquired from Horizon Bank in 2010 and certain loans acquired from South Valley Bank and Trust ("SVBT") in fiscal 2013 that were originally recorded at their estimated fair value at the time acquired. Covered real estate held for sale represents the foreclosed properties that were originally Horizon Bank loans or certain SVBT loans. Covered real estate held for sale is carried at the estimated fair value of the repossessed real estate. The covered loans and covered real estate held for sale are collectively referred to as “covered assets." When FDIC loss share agreements expire, any remaining loans will be transferred to the non-covered portfolio. Covered loans are included within loans receivable on the statement of financial condition. Covered real estate owned are included within real estate owned on the statement of financial condition. FDIC indemnification asset. The FDIC indemnification asset is the receivable recorded due to the guarantee provided by the FDIC on the covered assets. This asset declines due to collections from the FDIC on claims or the eventual expiration of the FDIC loss share agreements. The FDIC indemnification asset is included within other assets on the statement of financial condition.
Client derivatives, long term borrowing hedges, and commercial loan hedge	Client derivatives. Interest rate swap agreements are provided to certain clients who desire to convert their obligations from variable to fixed interest rates. Under these agreements, the Bank enters into a variable-rate loan agreement with a customer in addition to a swap agreement, and then enters into a corresponding swap agreement with a third party in order to offset its exposure on the customer swap agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under FASB ASC 815, Derivatives and Hedging, the instruments are marked to market in earnings. The change in fair value of the offsetting swaps are included in interest income and interest expense and there is no impact on net income. There is fee income earned on the swaps that is included in loan fee income. Long term borrowing hedges. The Company has entered into interest rate swaps to convert a series of future short-term borrowings to fixed-rate payments. These interest rate swaps qualify as cash flow hedging instruments under ASC 815 so gains and losses are recorded in Other Comprehensive Income to the extent the hedge is effective. Gains and losses on the interest rate swaps are reclassified from OCI to earnings in the period the hedged transaction affects earnings and are included in the same income statement line item that the hedged transaction is recorded. Commercial loan hedges. The Company has entered into interest rate swaps to hedge long term fixed rate commercial loans. These hedges qualify as fair value hedges under ASC 815 and provide for matching of the recognition of the gains and losses on the interest rate swap and the related hedged loan.
Premises and equipment	Premises and equipment. Premises and equipment are stated at cost, less accumulated depreciation. Depreciation is computed on the straight-line method over the estimated useful lives of the respective assets. Expenditures are capitalized for betterments and major renewals. Charges for ordinary maintenance and repairs are expensed to operations as incurred.
Real estate owned	Real estate owned. Real estate properties acquired through foreclosure of loans or through acquisitions are recorded initially at fair value less selling costs and are subsequently recorded at lower of cost or fair value. Any gains (losses) and maintenance costs are shown on the real estate acquired through foreclosure line item.
Intangible assets	Intangible assets. Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired. Other intangibles, including core deposit intangibles, are acquired assets that lack physical substance but can be distinguished from goodwill. Goodwill is evaluated for impairment on an annual basis during the fourth quarter. Other intangible assets are amortized over their estimated lives and are subject to impairment testing when events or circumstances change. If circumstances indicate that the carrying value of the assets may not be recoverable, an impairment charge could be recorded. The Bank amortizes the core deposit intangibles over their estimated lives using an accelerated method.
Income taxes	Income taxes. Income taxes are accounted for using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, a deferred tax asset or liability is determined based on the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The provision for income taxes includes current and deferred income tax expense based on net income adjusted for temporary and permanent differences such as depreciation, interest on state and municipal securities, and affordable housing tax credits. Income tax related interest and penalties, if applicable, and amortization of affordable housing tax credit investments are recorded within income tax expense.
Accounting for stock-based compensation	Accounting for stock-based compensation. We recognize in the statement of operations the grant-date fair value of stock options and other equity-based forms of compensation issued to employees over the employees' requisite service period (generally the vesting period). The requisite service period may be subject to performance conditions. Stock options and restricted stock awards generally vest ratably over three to ten years and are recognized as expense over that same period of time. The exercise price of each option equals the market price of the Company's common stock on the date of the grant, and the maximum term is ten years. No stock options were granted in 2017 , 2016 or 2015 . Certain grants of restricted stock are subject to performance-based and market-based vesting as well as other approved vesting conditions and cliff vest based on those conditions. Compensation expense is recognized over the service period to the extent restricted stock awards are expected to vest.
Business segments	Business segments. As the Company manages its business and operations on a consolidated basis, management has determined that there is one reportable business segment.
New accounting pronouncements	In August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The ASU expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The effective date of the new standard for public companies is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition with a cumulative effect adjustment recorded to opening retained earnings as of the initial adoption date. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements . In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. The ASU clarifies that a financial asset is within the scope of Subtopic 610-20 if it meets the definition of an in substance nonfinancial asset. The amendments also define the term in substance nonfinancial asset. The amendments clarify that nonfinancial assets within the scope of Subtopic 610-20 may include nonfinancial assets transferred within a legal entity to a counterparty. A contract that includes the transfer of ownership interests in one or more consolidated subsidiaries is within the scope of Subtopic 610-20 if substantially all of the fair value of the assets that are promised to the counterparty in a contract is concentrated in nonfinancial assets. The amendments clarify that an entity should identify each distinct nonfinancial asset or in substance nonfinancial asset promised to a counterparty and derecognize each asset when a counterparty obtains control of it. The ASU is effective for public business entities for annual periods beginning after December 15, 2017, and interim periods therein. Entities may use either a full or modified approach to adopt the ASU. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment , which eliminates Step 2 from the goodwill impairment test. The ASU also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The ASU is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption being permitted for annual or interim goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations Clarifying the Definition of a Business (Topic 805) , for determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017, with early adoption permitted for transactions that occurred before the issuance date or effective date of the standard if the transactions were not reported in financial statements that have been issued or made available for issuance. The ASU must be applied prospectively and upon adoption the standard will impact how we assess acquisitions (or disposals) of assets or businesses. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash: a Consensus of the FASB Emerging Issues Task Force . This ASU requires a company’s cash flow statement to explain the changes during a reporting period of the totals for cash, cash equivalents, restricted cash, and restricted cash equivalents. Additionally, amounts for restricted cash and restricted cash equivalents are to be included with cash and cash equivalents if the cash flow statement includes a reconciliation of the total cash balances for a reporting period. This ASU is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017, with early application permitted. The Company does not anticipate that this guidance will have a material impact on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments in this ASU address eight specific cash flow issues with the objective of reducing diversity in practice. The specific issues identified include: debt prepayments or extinguishment costs; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period; however, early adoption is permitted. The Company is currently evaluating the guidance to determine its adoption method and does not expect this guidance to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses . The amendments in this ASU were issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investments in leases and other commitments to extend credit held by a reporting entity at each reporting date. The amendments require that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The ASU eliminates the current framework of recognizing probable incurred losses and instead requires an entity to use its current estimate of all expected credit losses over the contractual life. The measurement of expected credit losses is based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets. For purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, an allowance for expected credit losses is recorded as an adjustment to the cost basis of the asset. Subsequent changes in estimated cash flows would be recorded as an adjustment to the allowance and through the statement of income. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses rather than as a direct write-down to the security's cost basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. For most debt securities, the transition approach requires a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period the guidance is effective. For other-than-temporarily impaired debt securities and PCD assets, the guidance will be applied prospectively. While the Company is currently in the process of evaluating the impact of the amended guidance on its consolidated financial statements, it currently expects the ALLL to increase upon adoption given that the allowance will be required to cover the full remaining expected life of the portfolio upon adoption, rather than the incurred loss model under current U.S. GAAP. The extent of this increase is still being evaluated and will depend on economic conditions and the composition of the Company’s loan and lease portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, Leases . The amendments require lessees to recognize a lease liability, which is a lessee's obligation to make lease payments arising from a lease, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. The guidance also simplifies the accounting for sale and leaseback transactions. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted upon issuance. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. The Company is currently in the process of accumulating the lease data necessary to apply the amended guidance. The Company is continuing to evaluate the impact of the amended guidance on its consolidated financial statements, but the effects of recognizing most operating leases is not expected to be material. The Company expects to recognize right-of-use assets and lease liabilities for substantially all of its operating lease commitments based on the present value of unpaid lease payments as of the date of adoption. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , to require all equity investments to be measured at fair value with changes in the fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update was to be effective for interim and annual periods beginning after December 15, 2016. However, in August 2015, the FASB issued ASU 2015-14, which delayed the effective date of ASU 2014-09 by one year and permits companies to voluntarily adopt the new standard as of the original effective date. The Company does not expect this guidance to have a material impact on its consolidated financial statements.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Schedule of goodwill and intangible assets	The table below provides detail regarding the Company's intangible assets. Goodwill Core Deposit and Other Intangibles Total (In thousands) Balance at September 30, 2015 $ 291,503 $ 7,855 $ 299,358 Amortization — (2,369 ) (2,369 ) Balance at September 30, 2016 291,503 5,486 296,989 Additions 1,650 1,720 3,370 Amortization — (1,677 ) (1,677 ) Balance at September 30, 2017 $ 293,153 $ 5,529 $ 298,682
Schedule of future amortization expense	The table below presents the estimated future amortization expense of core deposit and other intangibles for the next five years. Fiscal Year Expense (In thousands) 2018 $ 1,376 2019 1,324 2020 1,295 2021 457 2022 138

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments by contractual maturity date	The tables below provide detail regarding the amortized cost and fair value of available-for-sale and held-to-maturity investment securities. September 30, 2017 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses (In thousands) Available-for-sale securities U.S. government and agency securities due Within 1 year $ 9,300 $ 146 $ — $ 9,446 10.38 % 1 to 5 years 5,688 2 — 5,690 1.51 5 to 10 years 69,108 — (1,238 ) 67,870 1.93 Over 10 years 127,936 353 (218 ) 128,071 1.92 Equity Securities 1 to 5 years 500 22 — 522 1.80 Corporate debt securities due 1 to 5 years 63,622 2,083 — 65,705 2.96 5 to 10 years 119,960 210 (577 ) 119,593 2.62 Municipal bonds due Within 1 year 2,344 10 — 2,354 1.23 1 to 5 years 1,367 55 — 1,422 2.05 Over 10 years 20,343 2,505 — 22,848 6.45 Mortgage-backed securities Agency pass-through certificates 828,069 8,402 (2,174 ) 834,297 2.96 Commercial MBS 8,350 41 — 8,391 3.31 1,256,587 13,829 (4,207 ) 1,266,209 2.86 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,646,856 7,143 (18,086 ) 1,635,913 3.14 1,646,856 7,143 (18,086 ) 1,635,913 3.14 $ 2,903,443 $ 20,972 $ (22,293 ) $ 2,902,122 3.02 % September 30, 2016 Amortized Cost Gross Unrealized Fair Value Yield Gains Losses (In thousands) Available-for-sale securities U.S. government and agency securities due Within 1 year $ 21,284 $ — $ (59 ) $ 21,225 0.81 % 1 to 5 years 12,477 1,027 (11 ) 13,493 7.94 5 to 10 years 48,134 — (1,589 ) 46,545 1.14 Over 10 years 182,051 27 (3,990 ) 178,088 1.33 Equity Securities 1 to 5 years 100,422 1,402 — 101,824 1.90 Corporate debt securities due Within 1 year 278,094 325 (53 ) 278,366 1.33 1 to 5 years 63,481 928 (113 ) 64,296 2.47 5 to 10 years 69,955 — (2,417 ) 67,538 1.96 Over 10 years 50,000 938 — 50,938 3.00 Municipal bonds due 1 to 5 years 2,315 2 — 2,317 1.23 5 to 10 years 1,335 38 — 1,373 2.05 Over 10 years 20,363 3,617 — 23,980 6.45 Mortgage-backed securities Agency pass-through certificates 978,955 17,118 (3,032 ) 993,041 2.58 Commercial MBS 80,318 — (448 ) 79,870 1.91 1,909,184 25,422 (11,712 ) 1,922,894 2.22 Held-to-maturity securities Mortgage-backed securities Agency pass-through certificates 1,417,599 24,171 (214 ) 1,441,556 3.18 1,417,599 24,171 (214 ) 1,441,556 3.18 $ 3,326,783 $ 49,593 $ (11,926 ) $ 3,364,450 2.62 %
Schedule of unrealized losses and fair value of securities	The following table shows the gross unrealized losses and fair value of securities at September 30, 2017 , and September 30, 2016 , by length of time that individual securities in each category have been in a continuous loss position. Management believes that the declines in fair value of these investments are not an other than temporary impairment as these losses are due to a change in interest rates rather than any credit deterioration. The impairment is also deemed to be temporary because: 1) the Bank does not intend to sell the security, and 2) it is not more likely than not that it will be required to sell the security before recovery of the entire amortized cost basis of the security. September 30, 2017 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ — $ — $ (577 ) $ 49,423 $ (577 ) $ 49,423 U.S. agency securities (759 ) 24,400 (697 ) 96,195 (1,456 ) 120,595 Agency pass-through certificates (17,683 ) 1,163,358 (2,577 ) 249,304 (20,260 ) 1,412,662 $ (18,442 ) $ 1,187,758 $ (3,851 ) $ 394,922 $ (22,293 ) $ 1,582,680 September 30, 2016 Less than 12 months 12 months or more Total Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value Unrealized Gross Losses Fair Value (In thousands) Corporate debt securities $ — $ — $ (2,582 ) $ 100,467 $ (2,582 ) $ 100,467 U.S. agency securities (11 ) 3,167 (5,638 ) 220,613 (5,649 ) 223,780 Agency pass-through certificates (1,278 ) 301,030 (2,417 ) 232,407 (3,695 ) 533,437 $ (1,289 ) $ 304,197 $ (10,637 ) $ 553,487 $ (11,926 ) $ 857,684

Loans Receivable (Tables)

Loans Receivable (Tables)	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of loans receivable (excluding covered loans)	The following table is a summary of loans receivable. September 30, 2017 September 30, 2016 (In thousands) (In thousands) Gross loans by category Single-family residential $ 5,711,004 46.8 % $ 5,658,830 51.7 % Construction 1,597,996 13.1 1,110,411 10.1 Construction - custom 602,631 4.9 473,069 4.3 Land - acquisition & development 124,308 1.0 118,497 1.1 Land - consumer lot loans 104,405 0.9 104,567 1.0 Multi-family 1,303,148 10.7 1,124,290 10.3 Commercial real estate 1,434,610 11.8 1,093,639 10.0 Commercial & industrial 1,093,360 9.0 978,589 8.9 HELOC 144,850 1.2 149,716 1.4 Consumer 85,075 0.7 139,000 1.3 Total gross loans 12,201,387 100 % 10,950,608 100 % Less: Allowance for probable losses 123,073 113,494 Loans in process 1,149,934 879,484 Net deferred fees, costs and discounts 45,758 46,710 Total loan contra accounts 1,318,765 1,039,688 Net loans $ 10,882,622 $ 9,910,920
Schedule of fixed and adjustable rate loans	The following summary breaks down the Company's fixed rate and adjustable rate loans by time to maturity or to rate adjustment. September 30, 2017 Fixed-Rate Adjustable-Rate Term To Maturity Gross Loans % of Gross Loans Term To Rate Adjustment Gross Loans % of Gross Loans (In thousands) (In thousands) Within 1 year $ 71,810 0.6 % Less than 1 year $ 3,157,055 25.9 % 1 to 3 years 216,724 1.8 1 to 3 years 498,844 4.1 3 to 5 years 308,967 2.5 3 to 5 years 624,254 5.1 5 to 10 years 847,518 6.9 5 to 10 years 512,774 4.2 10 to 20 years 1,047,541 8.6 10 to 20 years — — Over 20 years 4,915,900 40.3 Over 20 years — — $ 7,408,460 60.7 % $ 4,792,927 39.3 %
Schedule of loans receivable by geographic area	The following tables provide information regarding loans receivable by loan category and geography. September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC Total (In thousands) Washington $ 3,013,957 $ 315,356 $ 55,794 $ 65,449 $ 357,080 $ 613,362 $ 528,762 $ 555,651 $ 2,186 $ 87,290 $ 5,594,887 Oregon 659,602 378,588 33,109 13,535 59,861 269,037 254,513 217,813 2,252 13,577 1,901,887 Arizona 581,137 340,609 4,801 11,446 77,315 102,546 218,200 50,506 296 13,781 1,400,637 Other 57,891 3,423 — 69 — 4,360 95,304 106,226 78,614 53 345,940 Utah 514,922 40,014 90 4,321 55,064 272,723 28,586 38,328 22 7,823 961,893 Idaho 306,853 41,243 14,593 4,586 23,721 45,603 65,342 29,529 123 7,293 538,886 New Mexico 202,703 115,289 10,272 2,108 17,406 62,635 173,774 14,186 768 13,332 612,473 Texas 185,835 43,493 5,649 106 3,534 205,595 61,439 59,484 775 — 565,910 Nevada 188,104 25,133 — 2,785 8,650 22,135 8,690 21,637 39 1,701 278,874 $ 5,711,004 $ 1,303,148 $ 124,308 $ 104,405 $ 602,631 $ 1,597,996 $ 1,434,610 $ 1,093,360 $ 85,075 $ 144,850 $ 12,201,387 Percentage by geographic area September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC Total As % of total gross loans Washington 24.6 % 2.6 % 0.4 % 0.5 % 2.9 % 5.1 % 4.4 % 4.6 % — % 0.7 % 45.8 % Oregon 5.4 3.1 0.3 0.1 0.5 2.2 2.1 1.8 — 0.1 15.6 Arizona 4.8 2.8 — 0.1 0.6 0.8 1.8 0.4 — 0.1 11.4 Other 0.5 — — — — — 0.8 0.9 0.7 — 2.9 Utah 4.2 0.3 — 0.1 0.5 2.2 0.2 0.3 — 0.1 7.9 Idaho 2.5 0.4 0.1 0.1 0.2 0.4 0.5 0.2 — 0.1 4.5 New Mexico 1.7 0.9 0.1 — 0.1 0.5 1.4 0.1 — 0.1 4.9 Texas 1.5 0.4 — — — 1.7 0.5 0.5 — — 4.6 Nevada 1.5 0.2 0.1 — 0.1 0.2 0.1 0.2 — — 2.4 46.7 % 10.7 % 1.0 % 0.9 % 4.9 % 13.1 % 11.8 % 9.0 % 0.7 % 1.2 % 100 % Percentage by geographic area as a % of each loan type September 30, 2017 Single - Multi- Land - Land - Construction - custom Construction Commercial Commercial Consumer HELOC As % of total gross loans Washington 52.8 % 24.2 % 44.9 % 62.6 % 59.4 % 38.3 % 36.9 % 50.9 % 2.8 % 60.3 % Oregon 11.5 29.1 26.6 13.0 9.9 16.8 17.7 19.9 2.6 9.4 Arizona 10.2 26.1 3.9 11.0 12.8 6.4 15.2 4.6 0.3 9.5 Other 1.0 0.3 — 0.1 — 0.3 6.6 9.7 92.4 — Utah 9.0 3.1 0.1 4.1 9.1 17.1 2.0 3.5 — 5.4 Idaho 5.4 3.2 11.7 4.4 3.9 2.9 4.6 2.7 0.1 5.0 New Mexico 3.5 8.8 8.3 2.0 2.9 3.9 12.1 1.3 0.9 9.2 Texas 3.3 3.3 4.5 0.1 0.6 12.9 4.3 5.4 0.9 — Nevada 3.3 1.9 — 2.7 1.4 1.4 0.6 2.0 — 1.2 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 % 100 %
Schedule of impaired loans, loan commitments and loans serviced	The following table provides additional information on impaired loans, loan commitments and loans serviced for others. September 30, 2017 September 30, 2016 (In thousands) Recorded investment in impaired loans $ 251,274 $ 285,243 TDRs included in impaired loans 207,377 261,531 Allocated reserves on impaired loans 1,363 1,980 Specific reserves on impaired loans 126 366 Average balance of impaired loans for year ended 274,530 301,685 Interest income from impaired loans for year ended 11,736 12,843 Outstanding fixed-rate origination commitments 425,130 331,947 Gross loans serviced for others 77,119 80,896
Non accrual loans held by the company	The following table sets forth information regarding non-accrual loans. September 30, 2017 September 30, 2016 (In thousands) (In thousands) Non-accrual loans: Single-family residential $ 27,930 56.3 % $ 33,148 78.2 % Construction - custom 91 0.2 — — Land - acquisition & development 296 0.6 58 0.1 Land - consumer lot loans 605 1.2 510 1.2 Multi-family 139 0.3 776 1.8 Commercial real estate 11,815 23.8 7,100 16.7 Commercial & industrial 8,082 16.3 583 1.4 HELOC 531 1.1 239 0.6 Consumer 91 0.2 — — Total non-accrual loans $ 49,580 100 % $ 42,414 100 % Non-accrual loans as % of total loans 0.46 % 0.43 %
Aging of past due loans	The following table breaks down delinquent loans by loan category and delinquency bucket. September 30, 2017 Amount of Loans Days Delinquent Based on $ Amount of Loans % based on $ Loan type Net of Loans in Process Current 30 60 90 Total (In thousands) Single-family residential $ 5,709,690 $ 5,671,933 $ 10,925 $ 4,810 $ 22,022 $ 37,757 0.66 % Construction 793,959 793,959 — — — — — Construction - custom 277,599 277,508 — — 91 91 0.03 Land - acquisition & development 104,856 104,526 — — 330 330 0.31 Land - consumer lot loans 104,335 103,389 112 680 154 946 0.91 Multi-family 1,303,119 1,302,720 5 255 139 399 0.03 Commercial real estate 1,434,610 1,432,052 507 — 2,051 2,558 0.18 Commercial & industrial 1,093,360 1,092,735 — 51 574 625 0.06 HELOC 144,850 143,974 221 342 313 876 0.60 Consumer 85,075 84,644 245 107 79 431 0.51 Total Loans $ 11,051,453 $ 11,007,440 $ 12,015 $ 6,245 $ 25,753 $ 44,013 0.40 % Delinquency % 99.60% 0.11% 0.06% 0.23% 0.40%
Schedule of loan modifications	The following table provides information related to loans that were modified in a TDR during the periods presented. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 Pre-Modification Post-Modification Pre-Modification Post-Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded Troubled Debt Restructurings: Contracts Investment Investment Contracts Investment Investment (In thousands) (In thousands) Single-family residential 38 $ 7,115 $ 7,115 120 $ 23,541 $ 23,541 Land - consumer lot loans 2 211 211 10 970 970 Commercial real estate — — — 7 2,523 2,523 HELOC 4 552 552 1 126 126 Consumer — — — 1 24 24 44 $ 7,878 $ 7,878 139 $ 27,184 $ 27,184 The following table provides information on payment defaults occurring during the periods presented where the loan had been modified in a TDR within 12 months of the payment default. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 Number of Recorded Number of Recorded TDRs That Subsequently Defaulted: Contracts Investment Contracts Investment (In thousands) (In thousands) Single-family residential 24 $ 4,214 17 $ 4,875 Construction — — 1 279 Land - consumer lot loans — — 5 606 Commercial real estate 2 267 2 326 26 $ 4,481 25 $ 6,086
Schedule of activity for FDIC indemnification asset	The following table shows the year to date activity for the FDIC indemnification asset. Twelve Months Ended September 30, 2017 Twelve Months Ended September 30, 2016 (In thousands) Balance at beginning of year $ 12,769 $ 16,275 Payments received (584 ) (1,730 ) Amortization (3,450 ) (2,012 ) Accretion 232 236 Balance at end of year $ 8,967 $ 12,769

Allowance for Losses on Loans (

Allowance for Losses on Loans (Tables)	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of activity in allowance for loan losses	The following tables summarize the activity in the allowance for loan losses. Twelve Months Ended September 30, 2017 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 37,796 $ (1,229 ) $ 653 $ (328 ) $ 36,892 Construction 19,838 — — 4,718 24,556 Construction - custom 1,080 (16 ) — 880 1,944 Land - acquisition & development 6,023 (280 ) 11,038 (9,952 ) 6,829 Land - consumer lot loans 2,535 (17 ) 481 (350 ) 2,649 Multi-family 6,925 — — 937 7,862 Commercial real estate 8,588 (11 ) 1,684 1,557 11,818 Commercial & industrial 28,008 (173 ) 1,833 (1,144 ) 28,524 HELOC 813 (90 ) 21 111 855 Consumer 1,888 (884 ) 1,297 (1,157 ) 1,144 $ 113,494 $ (2,700 ) $ 17,007 $ (4,728 ) $ 123,073 Twelve Months Ended September 30, 2016 Beginning Allowance Charge-offs Recoveries Provision & Transfers Ending Allowance (In thousands) Single-family residential $ 47,347 $ (3,106 ) $ 3,251 $ (9,696 ) $ 37,796 Construction 6,680 — 745 12,413 19,838 Construction - custom 990 (60 ) 60 90 1,080 Land - acquisition & development 5,781 (42 ) 8,220 (7,936 ) 6,023 Land - consumer lot loans 2,946 (732 ) 5 316 2,535 Multi-family 5,304 — — 1,621 6,925 Commercial real estate 8,960 (103 ) 1,812 (2,081 ) 8,588 Commercial & industrial 24,980 (941 ) 2,933 1,036 28,008 HELOC 902 (54 ) 21 (56 ) 813 Consumer 2,939 (962 ) 2,018 (2,107 ) 1,888 $ 106,829 $ (6,000 ) $ 19,065 $ (6,400 ) $ 113,494
Summary of loans collectively and individually evaluated for impairment and related allocation of reserves	The following tables show a summary of loans collectively and individually evaluated for impairment and the related allocation of general and specific reserves. September 30, 2017 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment General Reserve Allocation Recorded Investment of Loans Ratio Specific Reserve Allocation Recorded Investment of Loans Ratio (In thousands) (In thousands) Single-family residential $ 36,893 $ 5,713,576 0.7 % $ — $ 5,552 — % Construction 24,556 793,958 3.1 — — — Construction - custom 1,944 277,495 0.7 — 105 — Land - acquisition & development 6,828 104,767 6.5 1 89 1.0 Land - consumer lot loans 2,649 96,337 2.8 — 171 — Multi-family 7,857 1,302,625 0.6 5 493 1.0 Commercial real estate 11,697 1,391,668 0.8 120 21,765 0.6 Commercial & industrial 28,524 1,093,210 2.6 — 81 — HELOC 855 141,689 0.6 — 215 — Consumer 1,144 84,887 1.4 — 82 — $ 122,947 $ 11,000,212 1.1 % $ 126 $ 28,553 0.4 % September 30, 2016 Loans Collectively Evaluated for Impairment Loans Individually Evaluated for Impairment General Reserve Allocation Recorded Investment of Loans Ratio Specific Reserve Allocation Recorded Investment of Loans Ratio (In thousands) (In thousands) Single-family residential $ 37,536 $ 5,585,912 0.7 % $ 260 $ 19,629 1.3 % Construction 19,838 498,450 4.0 — — — Construction - custom 1,080 229,298 0.5 — 330 — Land - acquisition & development 6,022 90,850 6.6 2 850 0.2 Land - consumer lot loans 2,535 92,828 2.7 — 558 — Multi-family 6,911 1,091,974 0.6 13 1,505 0.9 Commercial real estate 8,497 957,380 0.9 91 11,157 0.8 Commercial & industrial 28,008 966,930 2.9 — — — HELOC 813 133,203 0.6 — 239 — Consumer 1,888 137,315 1.4 — 3 — $ 113,128 $ 9,784,140 1.2 % $ 366 $ 34,271 1.1 %
Summary of loans based on credit quality indicators	The following tables provide information on loans based on credit quality indicators (defined above). September 30, 2017 Internally Assigned Grade Total Pass Special mention Substandard Doubtful Loss Gross Loans (In thousands) Loan type Single-family residential $ 5,671,229 $ — $ 39,775 $ — $ — $ 5,711,004 Construction 1,594,926 — 3,070 — — 1,597,996 Construction - custom 602,540 — 91 — — 602,631 Land - acquisition & development 123,028 207 1,073 — — 124,308 Land - consumer lot loans 103,787 — 618 — — 104,405 Multi-family 1,295,261 5,795 2,092 — — 1,303,148 Commercial real estate 1,391,996 5,944 36,670 — — 1,434,610 Commercial & industrial 1,054,972 14,814 23,574 — — 1,093,360 HELOC 144,229 — 621 — — 144,850 Consumer 84,984 — 91 — — 85,075 Total gross loans $ 12,066,952 $ 26,760 $ 107,675 $ — $ — $ 12,201,387 Total grade as a % of total gross loans 98.9 % 0.2 % 0.9 % — % — % September 30, 2016 Internally Assigned Grade Total Pass Special mention Substandard Doubtful Loss Gross Loans (In thousands) Loan type Single-family residential $ 5,607,521 $ — $ 51,309 $ — $ — $ 5,658,830 Construction 1,098,549 8,595 3,267 — — 1,110,411 Construction - custom 473,069 — — — — 473,069 Land - acquisition & development 111,225 — 7,272 — — 118,497 Land - consumer lot loans 103,528 — 1,039 — — 104,567 Multi-family 1,117,437 3,237 3,616 — — 1,124,290 Commercial real estate 1,033,880 13,446 46,313 — — 1,093,639 Commercial & industrial 930,776 7,207 40,606 — — 978,589 HELOC 149,195 — 521 — — 149,716 Consumer 138,917 — 83 — — 139,000 Total gross loans $ 10,764,097 $ 32,485 $ 154,026 $ — $ — $ 10,950,608 Total grade as a % of total gross loans 98.3 % 0.3 % 1.4 % — % — %
Schedule of credit risk profile by payment activity	The following tables provide information on loans based on payment activity. September 30, 2017 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands) (In thousands) Single-family residential $ 5,683,074 99.5 % $ 27,930 0.5 % Construction 1,597,996 100.0 — — Construction - custom 602,540 99.9 91 0.1 Land - acquisition & development 124,012 99.8 296 0.2 Land - consumer lot loans 103,800 99.4 605 0.6 Multi-family 1,303,009 99.9 139 0.1 Commercial real estate 1,422,795 99.2 11,815 0.8 Commercial & industrial 1,085,278 99.3 8,082 0.7 HELOC 144,319 99.6 531 0.4 Consumer 84,984 99.9 91 0.1 $ 12,151,807 99.6 % $ 49,580 0.4 % September 30, 2016 Performing Loans Non-Performing Loans Amount % of Total Gross Loans Amount % of Total Gross Loans (In thousands) (In thousands) Single-family residential $ 5,625,682 99.4 % $ 33,148 0.6 % Construction 1,110,411 100.0 — — Construction - custom 473,069 100.0 — — Land - acquisition & development 118,439 99.9 58 0.1 Land - consumer lot loans 104,057 99.5 510 0.5 Multi-family 1,123,583 99.9 776 0.1 Commercial real estate 1,086,470 99.3 7,100 0.7 Commercial & industrial 978,006 99.9 583 0.1 HELOC 149,477 99.8 239 0.2 Consumer 139,000 100.0 — — $ 10,908,194 99.6 % $ 42,414 0.4 %
Summary of impaired loans based on type	The following tables provide information on impaired loans by loan category. September 30, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 21,325 $ 23,880 $ — $ 19,371 Construction — — — — Construction - custom 148 165 — 231 Land - acquisition & development 330 8,208 — 176 Land - consumer lot loans 208 330 — 431 Multi-family 139 3,231 — 748 Commercial real estate 12,890 22,487 — 11,466 Commercial & industrial 8,279 14,321 — 7,425 HELOC 490 1,212 — 487 Consumer 88 1,433 — 57 43,897 75,267 — 40,392 Impaired loans with an allowance recorded: Single-family residential 181,941 186,167 4,030 204,723 Construction — — — — Construction - custom — — — — Land - acquisition & development 90 90 1 576 Land - consumer lot loans 7,949 8,526 — 8,976 Multi-family 493 493 5 1,024 Commercial real estate 15,079 16,707 120 16,991 Commercial & industrial — — — 297 HELOC 1,728 1,806 — 1,451 Consumer 97 284 — 100 207,377 214,073 4,156 (1) 234,138 Total: Single-family residential 203,266 210,047 4,030 224,094 Construction — — — — Construction - custom 148 165 — 231 Land - acquisition & development 420 8,298 1 752 Land - consumer lot loans 8,157 8,856 — 9,407 Multi-family 632 3,724 5 1,772 Commercial real estate 27,969 39,194 120 28,457 Commercial & industrial 8,279 14,321 — 7,722 HELOC 2,218 3,018 — 1,938 Consumer 185 1,717 — 157 $ 251,274 $ 289,340 $ 4,156 (1) $ 274,530 ____________________ (1) Includes $126,000 of specific reserves and $4,030,000 included in the general reserves. September 30, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment (2) (In thousands) Impaired loans with no related allowance recorded: Single-family residential $ 9,627 $ 11,366 $ — $ 12,618 Construction — — — 91 Construction - custom — — — 603 Land - acquisition & development 138 9,001 — 720 Land - consumer lot loans 499 609 — 587 Multi-family 394 3,972 — 1,279 Commercial real estate 11,741 21,301 — 7,994 Commercial & industrial 1,030 3,082 — 1,205 HELOC 209 315 — 392 Consumer 74 550 — 236 23,712 50,196 — 25,725 Impaired loans with an allowance recorded: Single-family residential 228,186 232,595 3,809 238,187 Construction — — — 998 Construction - custom — — — — Land - acquisition & development 1,154 2,094 1 1,765 Land - consumer lot loans 9,630 10,678 1 10,330 Multi-family 1,505 1,505 13 2,159 Commercial real estate 19,434 22,848 91 20,998 Commercial & industrial — — — — HELOC 1,506 1,521 — 1,423 Consumer 116 306 — 100 261,531 271,547 3,915 (1) 275,960 Total: Single-family residential 237,813 243,961 3,809 250,805 Construction — — — 1,089 Construction - custom — — — 603 Land - acquisition & development 1,292 11,095 1 2,485 Land - consumer lot loans 10,129 11,287 1 10,917 Multi-family 1,899 5,477 13 3,438 Commercial real estate 31,175 44,149 91 28,992 Commercial & industrial 1,030 3,082 — 1,205 HELOC 1,715 1,836 — 1,815 Consumer 190 856 — 336 $ 285,243 $ 321,743 $ 3,915 (1) $ 301,685 ____________________ (1) Includes $366,000 of specific reserves and $3,549,000 included in the general reserves. (2) The average recorded investment changed from $265,771,000 , as previously disclosed, to $301,685,000 in order to correct for an immaterial error in the previous year's disclosure.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair value of assets measured on recurring basis	The following table presents the balance and level in the fair value hierarchy for assets and liabilities that are measured at fair value on a recurring basis. September 30, 2017 Level 1 Level 2 Level 3 Total (In thousands) Available-for-sale securities Equity securities $ 522 $ — $ — $ 522 U.S. government and agency securities — 211,077 — 211,077 Municipal bonds — 26,624 — 26,624 Corporate debt securities — 185,298 — 185,298 Mortgage-backed securities Agency pass-through certificates — 834,297 — 834,297 Commercial MBS — 8,391 — 8,391 Total Available-for-sale securities 522 1,265,687 — 1,266,209 Interest rate contracts — 1,139 — 1,139 Total Financial Assets $ 522 $ 1,266,826 $ — $ 1,267,348 Financial Liabilities Interest rate contracts $ — $ 1,139 $ — $ 1,139 Commercial loan hedges — 174 — 174 Long term borrowing hedges — 1,693 — 1,693 Total Financial Liabilities $ — $ 3,006 $ — $ 3,006 There were no transfers between, into and/or out of Levels 1, 2 or 3 during the year ended September 30, 2017 . September 30, 2016 Level 1 Level 2 Level 3 Total (In thousands) Available-for-sale securities Equity securities $ 101,824 $ — $ — $ 101,824 U.S. government and agency securities — 259,351 — 259,351 Municipal bonds — 27,670 — 27,670 Corporate debt securities — 461,138 — 461,138 Mortgage-backed securities Agency pass-through certificates — 993,041 — 993,041 Commercial MBS — 79,870 — 79,870 Total Available-for-sale securities 101,824 1,821,070 — 1,922,894 Interest rate contracts — 20,895 — 20,895 Total Financial Assets $ 101,824 $ 1,841,965 $ — $ 1,943,789 Financial Liabilities Interest rate contracts $ — $ 20,895 $ — $ 20,895 Commercial loan hedges — 3,312 — 3,312 Long term borrowing hedges — 31,347 — 31,347 Total Financial Liabilities $ — $ 55,554 $ — $ 55,554 There were no transfers between, into and/or out of Level 1, 2 or 3 during the year ended September 30, 2016 .
Aggregated balance of assets measured at estimated fair value on a nonrecurring basis and total losses resulting from those fair value adjustments	The following table presents the recorded balance of assets that were measured at estimated fair value on a nonrecurring basis for the periods presented, and the total gains (losses) resulting from those fair value adjustments for the periods presented. These estimated fair values are shown gross of estimated selling costs: September 30, 2017 Three Months Ended September 30, 2017 Twelve Months Ended September 30, 2017 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) Impaired loans (1) $ — $ — $ 9,088 $ 9,088 $ (250 ) $ (1,916 ) Real estate owned (2) — — 12,662 12,662 (376 ) (1,463 ) Balance at end of period $ — $ — $ 21,750 $ 21,750 $ (626 ) $ (3,379 ) ___________________ (1) The gains (losses) represent remeasurements of collateral-dependent impaired loans. (2) The gains (losses) represent aggregate writedowns and charge-offs on real estate owned. September 30, 2016 Three Months Ended September 30, 2016 Twelve Months Ended September 30, 2016 Level 1 Level 2 Level 3 Total Total Gains (Losses) (In thousands) Impaired loans (1) $ — $ — $ 17,476 $ 17,476 $ (474 ) $ (4,236 ) Real estate owned (2) — — 25,190 25,190 (1,003 ) (3,947 ) Balance at end of period $ — $ — $ 42,666 $ 42,666 $ (1,477 ) $ (8,183 ) ___________________ (1) The gains (losses) represent remeasurements of collateral-dependent impaired loans. (2) The gains (losses) represent aggregate writedowns and charge-offs on real estate owned.
Fair value of financial instruments by balance sheet grouping	Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below. September 30, 2017 September 30, 2016 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value (In thousands) Financial assets Cash and cash equivalents 1 $ 313,070 $ 313,070 $ 450,368 $ 450,368 Available-for-sale securities: Equity securities 1 522 522 101,824 101,824 U.S. government and agency securities 2 211,077 211,077 259,351 259,351 Municipal bonds 2 26,624 26,624 27,670 27,670 Corporate debt securities 2 185,298 185,298 461,138 461,138 Mortgage-backed securities Agency pass-through certificates 2 834,297 834,297 993,041 993,041 Commercial MBS 2 8,391 8,391 79,870 79,870 Total available-for-sale securities 1,266,209 1,266,209 1,922,894 1,922,894 Held-to-maturity securities: Mortgage-backed securities Agency pass-through certificates 2 1,646,856 1,635,913 1,417,599 1,441,556 Total held-to-maturity securities 1,646,856 1,635,913 1,417,599 1,441,556 Loans receivable 3 10,882,622 11,247,586 9,910,920 10,414,794 FDIC indemnification asset 3 8,968 8,564 12,769 12,095 FHLB and FRB stock 2 122,990 122,990 117,205 117,205 Other assets - interest rate contracts 2 1,139 1,139 20,895 20,895 Financial liabilities Customer accounts 2 10,835,008 10,411,686 10,600,852 10,184,321 FHLB advances and other borrowings 2 2,225,000 2,266,791 2,080,000 2,184,671 Other liabilities - interest rate contracts 2 1,139 1,139 20,895 20,895 Other liabilities - commercial loan hedges 2 174 174 3,312 3,312 Other liabilities - long term borrowing hedges 2 1,693 1,693 31,347 31,347 The following table presents the fair value and balance sheet classification of derivatives outstanding. Asset Derivatives Liability Derivatives September 30, 2017 September 30, 2016 September 30, 2017 September 30, 2016 (In thousands) Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Interest rate contracts Other assets $ 1,139 Other assets $ 20,895 Other liabilities $ 1,139 Other liabilities $ 20,895 Commercial loan hedges Other assets — Other assets — Other liabilities 174 Other liabilities 3,312 Long term borrowing hedges Other assets — Other assets — Other liabilities 1,693 Other liabilities 31,347 $ 1,139 $ 20,895 $ 3,006 $ 55,554

Derivative and Hedging Activiti

Derivative and Hedging Activities (Tables)	12 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of financial instruments by balance sheet grouping	Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below. September 30, 2017 September 30, 2016 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value (In thousands) Financial assets Cash and cash equivalents 1 $ 313,070 $ 313,070 $ 450,368 $ 450,368 Available-for-sale securities: Equity securities 1 522 522 101,824 101,824 U.S. government and agency securities 2 211,077 211,077 259,351 259,351 Municipal bonds 2 26,624 26,624 27,670 27,670 Corporate debt securities 2 185,298 185,298 461,138 461,138 Mortgage-backed securities Agency pass-through certificates 2 834,297 834,297 993,041 993,041 Commercial MBS 2 8,391 8,391 79,870 79,870 Total available-for-sale securities 1,266,209 1,266,209 1,922,894 1,922,894 Held-to-maturity securities: Mortgage-backed securities Agency pass-through certificates 2 1,646,856 1,635,913 1,417,599 1,441,556 Total held-to-maturity securities 1,646,856 1,635,913 1,417,599 1,441,556 Loans receivable 3 10,882,622 11,247,586 9,910,920 10,414,794 FDIC indemnification asset 3 8,968 8,564 12,769 12,095 FHLB and FRB stock 2 122,990 122,990 117,205 117,205 Other assets - interest rate contracts 2 1,139 1,139 20,895 20,895 Financial liabilities Customer accounts 2 10,835,008 10,411,686 10,600,852 10,184,321 FHLB advances and other borrowings 2 2,225,000 2,266,791 2,080,000 2,184,671 Other liabilities - interest rate contracts 2 1,139 1,139 20,895 20,895 Other liabilities - commercial loan hedges 2 174 174 3,312 3,312 Other liabilities - long term borrowing hedges 2 1,693 1,693 31,347 31,347 The following table presents the fair value and balance sheet classification of derivatives outstanding. Asset Derivatives Liability Derivatives September 30, 2017 September 30, 2016 September 30, 2017 September 30, 2016 (In thousands) Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Interest rate contracts Other assets $ 1,139 Other assets $ 20,895 Other liabilities $ 1,139 Other liabilities $ 20,895 Commercial loan hedges Other assets — Other assets — Other liabilities 174 Other liabilities 3,312 Long term borrowing hedges Other assets — Other assets — Other liabilities 1,693 Other liabilities 31,347 $ 1,139 $ 20,895 $ 3,006 $ 55,554

Interest Receivable (Tables)

Interest Receivable (Tables)	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of interest receivable	The following table provides a summary of interest receivable by interest earning asset type. September 30, 2017 September 30, 2016 (In thousands) Loans receivable $ 33,688 $ 29,858 Mortgage-backed securities 6,049 5,670 Investment securities 1,906 2,141 $ 41,643 $ 37,669

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	The following table provides a summary of premises and equipment by asset type. September 30, 2017 September 30, 2016 Estimated Useful Life (In thousands) Land — $ 102,381 $ 109,414 Buildings 25 - 40 149,805 143,841 Leasehold improvements 7 - 15 18,587 18,365 Furniture, software and equipment 2 - 10 119,518 115,199 390,291 386,819 Less accumulated depreciation and amortization (126,597 ) (104,868 ) $ 263,694 $ 281,951

Customer Accounts (Tables)

Customer Accounts (Tables)	12 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Schedule of deposits	The following table provides the composition of the Company's customer accounts, including interest rate buckets and maturity buckets for time deposits. September 30, 2017 September 30, 2016 (In thousands) Checking accounts, 0.15% and under $ 3,019,095 $ 2,721,721 Savings accounts, 0.10% and under 888,881 820,980 Money market accounts, 0.01% to 0.15% 2,453,182 2,462,891 Time deposit accounts Less than 1.00% 2,204,756 3,268,272 1.00% to 1.99% 2,099,841 1,292,612 2.00% to 2.99% 169,253 34,376 Total time deposits 4,473,850 4,595,260 $ 10,835,008 $ 10,600,852 Time deposit maturities are as follows: September 30, 2017 September 30, 2016 (In thousands) Within 1 year $ 2,553,712 $ 2,894,900 1 to 2 years 975,351 798,309 2 to 3 years 386,763 293,058 Over 3 years 558,024 608,993 $ 4,473,850 $ 4,595,260
Schedule of interest expense on customer deposits	Interest expense on customer accounts consisted of the following: Year ended September 30, 2017 2016 2015 (In thousands) Checking accounts $ 2,721 $ 1,491 $ 1,036 Savings accounts 978 734 660 Money market accounts 3,592 3,285 3,631 Time deposit accounts 45,256 47,425 46,273 52,547 52,935 51,600 Less early withdrawal penalties (524 ) (450 ) (546 ) $ 52,023 $ 52,485 $ 51,054 Weighted average interest rate at end of year 0.54 % 0.50 % 0.48 % Weighted daily average interest rate during the year 0.49 % 0.50 % 0.48 %

FHLB Advances and Other Borro35

FHLB Advances and Other Borrowings (Tables)	12 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Advances	The table below shows the maturity dates of outstanding FHLB advances. September 30, 2017 September 30, 2016 (In thousands) FHLB advances Within 1 year $ 1,395,000 $ 200,000 1 to 3 years 430,000 880,000 3 to 5 years 400,000 700,000 More than 5 years — 300,000 $ 2,225,000 $ 2,080,000
Weighted average cost and amount of advances	Financial data pertaining to the weighted-average cost and the amount of FHLB advances were as follows. 2017 2016 2015 (In thousands) Weighted average interest rate, net of cash flow hedges, at end of year 2.80 % 3.15 % 3.35 % Weighted daily average interest rate, net of cash flow hedges, during the year 3.00 % 3.22 % 3.57 % Daily average of FHLB advances during the year $ 2,167,986 $ 1,992,434 $ 1,848,904 Maximum amount of FHLB advances at any month end $ 2,350,000 $ 2,080,000 $ 1,930,000 Interest expense during the year (excludes interest rate swap expense) $ 64,968 $ 64,058 $ 64,331

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Summary of major sources of temporary differences and deferred tax effects	The table below provides a summary of the Company's tax assets and liabilities, including deferred tax assets and deferred tax liabilities by major source. Deferred tax balances represent temporary differences between the tax basis and the financial statement carrying amounts of assets and liabilities. September 30, 2017 September 30, 2016 (In thousands) Deferred tax assets Loan loss reserves $ 50,411 $ 45,531 REO reserves 1,693 4,018 Valuation adjustment on available-for-sale securities and cash flow hedges — 6,482 Non-accrual loan interest 2,262 2,812 FDIC assisted transactions 12,236 9,598 Federal and state tax credits 3,939 1,791 Deferred compensation 3,037 2,359 Stock based compensation 2,259 925 Other 1,274 625 Total deferred tax assets 77,111 74,141 Deferred tax liabilities FHLB stock dividends 24,135 24,135 Valuation adjustment on available-for-sale securities and cash flow hedges 2,914 — Loan origination fees and costs 13,643 14,826 Premises and equipment 35,950 34,936 Other 2,145 5,320 Total deferred tax liabilities 78,787 79,217 Net deferred tax asset (liability) (1,676 ) (5,076 ) Current tax asset (liability) (3,920 ) 21,123 Net tax asset (liability) $ (5,596 ) $ 16,047
Schedule of effective income tax rate reconciliation	The table below presents a reconciliation of the statutory federal income tax rate to the Company's effective income tax rate. Year ended September 30, 2017 2016 2015 Statutory income tax rate 35 % 35 % 35 % State income tax 1 1 2 Other differences (4 ) (2 ) (1 ) Effective income tax rate 32 % 34 % 36 %
Schedule of components of income tax expense (benefit)	The following table summarizes the Company's income tax expense (benefit) for the respective periods. Year ended September 30, 2017 2016 2015 (In thousands) Federal: Current $ 87,804 $ 57,173 $ 79,841 Deferred (10,142 ) 21,961 3,244 77,662 79,134 83,085 State: Current $ 4,991 $ 3,600 $ 6,636 Deferred 31 1,351 (518 ) 5,022 4,951 6,118 Total Current 92,795 60,773 86,477 Deferred (10,111 ) 23,312 2,726 $ 82,684 $ 84,085 $ 89,203

Stock Award Plans (Tables)

Stock Award Plans (Tables)	12 Months Ended
	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of option activity	A summary of stock option activity and changes during the year are as follows. Options Shares Weighted Weighted Aggregate Outstanding at September 30, 2016 459,443 $ 21.47 2 $2,392 Exercised (311,168 ) 22.83 Forfeited (25,745 ) 18.61 Outstanding at September 30, 2017 122,530 $ 18.64 2 $ 1,839 Exercisable at September 30, 2017 122,530 $ 18.64 2 $ 1,839
Schedule of miscellaneous information related to stock options	The table below presents other information regarding stock options. Year ended September 30, 2017 2016 2015 (In thousands, except fair value of options granted) Compensation cost for stock options $ — $ 89 $ 232 Weighted average grant date fair value per stock option 3.06 2.73 2.96 Total intrinsic value of options exercised 2,605 1,651 831 Grant date fair value of options exercised 1,328 1,422 368 Cash received from option exercises 7,238 9,283 2,070
Summary of nonvested activity	The following is a summary of activity related to unvested stock options. Year ended September 30, 2017 2016 2015 Non-vested Stock Options Options Outstanding Weighted Options Outstanding Weighted Options Outstanding Weighted Outstanding at beginning of period — $ — 69,287 $ 3.85 145,795 $ 3.87 Vested — — (62,227 ) 3.91 (61,018 ) 3.88 Forfeited — — (7,060 ) 3.89 (15,490 ) 3.90 Outstanding at end of period — $ — — $ — 69,287 $ 3.85
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of nonvested activity	The following table summarizes information about unvested restricted stock activity. Year ended September 30, 2017 2016 2015 Non-vested Restricted Stock Outstanding Weighted Outstanding Weighted Outstanding Weighted Outstanding at beginning of period 490,363 $ 16.00 521,302 $ 15.03 515,845 $ 14.10 Granted 238,450 18.89 229,450 $ 17.20 301,750 14.26 Vested (116,878 ) 20.95 (165,965 ) 15.96 (223,043 ) 13.24 Forfeited (145,254 ) 8.56 (94,424 ) 13.64 (73,250 ) 10.72 Outstanding at end of period 466,681 $ 18.56 490,363 $ 16.00 521,302 $ 15.03

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of compliance with regulatory capital requirements	Actual Capital Adequacy Categorized as Well Capitalized Under Prompt Corrective Action Provisions Capital Ratio Ratio Ratio September 30, 2017 (In thousands) Common Equity Tier 1 risk-based capital ratio: The Company $ 1,701,327 16.67 % 4.50 % NA The Bank 1,668,314 16.35 4.50 6.50 % Tier 1 risk-based capital ratio: The Company 1,701,327 16.67 6.00 NA The Bank 1,668,314 16.35 6.00 8.00 Total risk-based capital ratio: The Company 1,828,935 17.92 8.00 NA The Bank 1,795,929 17.60 8.00 10.00 Tier 1 leverage ratio: The Company 1,701,327 11.49 4.00 NA The Bank 1,668,314 11.27 4.00 5.00 September 30, 2016 Common Equity Tier 1 risk-based capital ratio: The Company $ 1,690,380 17.54 % 4.50 % NA The Bank 1,668,828 17.32 4.50 6.50 % Tier 1 risk-based capital ratio: The Company 1,690,380 17.54 6.00 NA The Bank 1,668,828 17.32 6.00 8.00 Total risk-based capital ratio: The Company 1,807,740 18.76 8.00 NA The Bank 1,786,188 18.54 8.00 10.00 Tier 1 leverage ratio: The Company 1,690,380 11.60 4.00 NA The Bank 1,668,828 11.45 4.00 5.00
Schedule of weighted average number of shares	The following table sets forth information regarding earnings per share calculations. Year ended September 30, 2017 2016 2015 Weighted average shares outstanding 88,905,457 91,399,038 95,644,639 Weighted average dilutive warrants 242,979 440,366 340,016 Weighted average dilutive options 75,771 73,514 69,304 Weighted average diluted shares 89,224,207 91,912,918 96,053,959 Net income (In thousands) $ 173,532 $ 164,049 $ 160,316 Basic EPS $ 1.95 $ 1.79 $ 1.68 Diluted EPS 1.94 1.78 1.67

Financial Information - Washi39

Financial Information - Washington Federal, INC. (Tables)	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of condensed financial information	The following Washington Federal, Inc. (parent company only) financial information should be read in conjunction with the other notes to the Consolidated Financial Statements. Condensed Statements of Financial Condition September 30, 2017 September 30, 2016 (In thousands) Assets Cash $ 33,077 $ 24,300 Other assets — 15 Investment in subsidiary 1,972,675 1,954,179 Total assets $ 2,005,752 $ 1,978,494 Liabilities Other liabilities $ 64 $ 2,763 Total liabilities 64 2,763 Stockholders’ equity Total stockholders’ equity 2,005,688 1,975,731 Total liabilities and stockholders’ equity $ 2,005,752 $ 1,978,494 Condensed Statements of Operations Twelve Months Ended September 30, 2017 2016 2015 (In thousands) Income Dividends from subsidiary $ 171,500 $ 148,000 $ 175,000 Total Income 171,500 148,000 175,000 Expense Miscellaneous 435 435 439 Total expense 435 435 439 Net income (loss) before equity in undistributed net income (loss) of subsidiary 171,065 147,565 174,561 Equity in undistributed net income of subsidiary 2,326 16,336 (14,402 ) Income before income taxes 173,391 163,901 160,159 Income tax benefit (expense) 141 148 157 Net income $ 173,532 $ 164,049 $ 160,316 Condensed Statements of Cash Flows Twelve Months Ended September 30, 2017 2016 2015 (In thousands) Cash Flows From Operating Activities Net income $ 173,532 $ 164,049 $ 160,316 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed net income (loss) of subsidiaries 3,584 (12,677 ) 32,375 Decrease (increase) in other assets 15 (15 ) — Increase (decrease) in other liabilities (2,699 ) 1,552 (13,189 ) Net cash provided by (used in) operating activities 174,432 152,909 179,502 Cash Flows From Financing Activities Proceeds from exercise of common stock options and related tax benefit 7,238 9,283 2,070 Warrants purchased — (7,744 ) — Treasury stock purchased (98,374 ) (87,850 ) (126,728 ) Dividends paid on common stock (74,519 ) (49,926 ) (51,111 ) Net cash provided by (used in) financing activities (165,655 ) (136,237 ) (175,769 ) Increase (decrease) in cash 8,777 16,672 3,733 Cash at beginning of year 24,300 7,628 3,895 Cash at end of year $ 33,077 $ 24,300 $ 7,628

Selected Quarterly Financial 40

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of unaudited interim results	The following is a summary of the unaudited interim results of operations by quarter for the years presented. Twelve Months Ended September 30, 2017 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share data) Interest income $ 132,764 $ 136,198 $ 137,716 $ 142,240 Interest expense 29,612 28,471 29,101 29,808 Net interest income 103,152 107,727 108,615 112,432 Provision (release) for loan losses — (1,600 ) — (500 ) Other operating income (including REO gain (loss), net) 12,294 10,931 13,798 16,686 Other operating expense 54,341 57,467 57,062 62,649 Income before income taxes 61,105 62,791 65,351 66,969 Income tax expense 19,859 20,721 21,239 20,865 Net income $ 41,246 $ 42,070 $ 44,112 $ 46,104 Basic earnings per share $ 0.46 $ 0.47 $ 0.49 $ 0.53 Diluted earnings per share 0.46 0.47 0.49 0.52 Cash dividends paid per share 0.14 0.40 0.15 0.15 Twelve Months Ended September 30, 2016 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share data) Interest income $ 135,124 $ 135,063 $ 133,735 $ 132,872 Interest expense 28,255 28,738 29,495 30,056 Net interest income 106,869 106,325 104,240 102,816 Provision (release) for loan losses — (1,500 ) (1,650 ) (3,100 ) Other operating income (REO expense) 12,055 14,623 15,573 14,830 Other operating expense 64,509 59,226 56,305 55,407 Income before income taxes 54,415 63,222 65,158 65,339 Income tax expense 19,317 21,499 22,154 21,115 Net income $ 35,098 $ 41,723 $ 43,004 $ 44,224 Basic earnings per share $ 0.38 $ 0.45 $ 0.47 $ 0.49 Diluted earnings per share 0.38 0.45 0.47 0.49 Cash dividends paid per share 0.13 0.14 0.14 0.14

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Other Narrative (Details)	Oct. 25, 2017$ / shares	Sep. 27, 2017extension	Sep. 30, 2017paymentofficesegmentpartshares	Sep. 30, 2016shares	Sep. 30, 2015shares
Summary of Significant Accounting Policies [Line Items]
Number of offices (in offices) | office			237
Days past grace period to initiate contact to cure deficiency			30 days
Minimum days past due to begin foreclosure proceedings			90 days
Approximate rate reduction concession, minimum			1.00%
Approximate rate reduction concession, maximum			2.00%
Minimum days past due to stop accrual of interest			90 days
Loans returned to full accrual status			90 days
Number of payments required | payment			6
Number of parts in loss percentage factor | part			2
Award vesting period (in years)			5 years
Options granted (in shares) | shares			0	0	0
Number of reportable business segments | segment			1
Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Dividends declared (in dollars per share) | $ / shares	$ 0.15
Anchor Bancorp
Summary of Significant Accounting Policies [Line Items]
Number of additional six month extensions | extension		3
Minimum
Summary of Significant Accounting Policies [Line Items]
Term for payment and rate reduction			6 months
Maximum
Summary of Significant Accounting Policies [Line Items]
Term for payment and rate reduction			12 months
Options exercisable, weighted average remaining contractual term (in years)			10 years
Stock Options and Restricted Stock | Minimum
Summary of Significant Accounting Policies [Line Items]
Award vesting period (in years)			3 years
Stock Options and Restricted Stock | Maximum
Summary of Significant Accounting Policies [Line Items]
Award vesting period (in years)			10 years

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period		$ 291,503	$ 291,503
Goodwill, additions		1,650
Goodwill, end of period	$ 293,153	293,153	291,503
Finite-lived Intangible Assets [Roll Forward]
Intangible assets. amortization		(1,677)	(2,369)
Goodwill and Intangible Assets [Roll Forward]
Goodwill and intangible assets, beginning of period		296,989	299,358
Goodwill and intangible assets, additions		3,370
Goodwill and intangible assets, end of period	298,682	298,682	296,989
Core Deposits and Other Intangibles
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, beginning of period		5,486	7,855
Intangible assets, additions		1,720
Intangible assets. amortization		(1,677)	(2,369)
Intangible assets, end of period	5,529	5,529	$ 5,486
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	1,376	1,376
2,019	1,324	1,324
2,020	1,295	1,295
2,021	457	457
2,022	138	$ 138
Acquisition of Businesses in Prior Years
Goodwill [Line Items]
Amortization of intangible assets	$ 1,500

Investment Securities - Investm

Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Amortized Cost, Available-for-sale securities
Amortized Cost	$ 1,256,587,000	$ 1,909,184,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains	13,829,000	25,422,000
Gross unrealized loss	(4,207,000)	(11,712,000)
Fair Value, Available-for-sale securities
Available-for-sale securities, at fair value	$ 1,266,209,000	$ 1,922,894,000
Yield, Available-for-sale securities
Yield	2.86%	2.22%
Amortized Cost, Held-to-maturity securities
Amortized Cost	$ 1,646,856,000	$ 1,417,599,000
Gross Unrealized Gains / Losses, Held-to-maturity securities
Gross unrealized gains	7,143,000	24,171,000
Gross unrealized losses	(18,086,000)	(214,000)
Fair Value, Held-to-maturity securities
Fair Value	1,635,913,000	1,441,556,000
Yield, Held-to-maturity securities
Investments	2,903,443,000	3,326,783,000
Gross unrealized gains on investments	20,972,000	49,593,000
Gross unrealized losses on investments	(22,293,000)	(11,926,000)
Fair value of investments	$ 2,902,122,000	$ 3,364,450,000
Yield on investments	3.02%	2.62%
Available-for-sale securities purchased	$ 76,367,000	$ 137,591,000	$ 315,114,000
Payments to acquire held-to-maturity securities	466,058,000	0	259,489,000
Proceeds from sales of available-for-sale investment securities	362,829,000	50,741,000	$ 246,826,000
Proceeds from sale of held-to-maturity securities	$ 0
Term of contractual due dates (in years)	25 years
U.S. government and agency securities
Amortized Cost, Available-for-sale securities
Within 1 year	$ 9,300,000	21,284,000
1 to 5 years	5,688,000	12,477,000
5 to 10 years	69,108,000	48,134,000
Over 10 years	127,936,000	182,051,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, within 1 year	146,000	0
Gross unrealized gains, 1 to 5 years	2,000	1,027,000
Gross unrealized gains, 5 to 10 years	0	0
Gross unrealized gains, over 10 years	353,000	27,000
Gross unrealized losses, within 1 year	0	(59,000)
Gross unrealized losses, 1 to 5 years	0	(11,000)
Gross unrealized losses, 5 to 10 years	(1,238,000)	(1,589,000)
Gross unrealized losses, over 10 years	(218,000)	(3,990,000)
Fair Value, Available-for-sale securities
Within 1 year	9,446,000	21,225,000
1 to 5 years	5,690,000	13,493,000
5 to 10 years	67,870,000	46,545,000
Over 10 years	$ 128,071,000	$ 178,088,000
Yield, Available-for-sale securities
Within 1 year	10.38%	0.81%
1 to 5 years	1.51%	7.94%
5 to 10 years	1.93%	1.14%
Over 10 years	1.92%	1.33%
Equity Securities
Amortized Cost, Available-for-sale securities
1 to 5 years	$ 500,000	$ 100,422,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, 1 to 5 years	22,000	1,402,000
Gross unrealized losses, 1 to 5 years	0	0
Fair Value, Available-for-sale securities
1 to 5 years	$ 522,000	$ 101,824,000
Yield, Available-for-sale securities
1 to 5 years	1.80%	1.90%
Corporate debt securities
Amortized Cost, Available-for-sale securities
Within 1 year		$ 278,094,000
1 to 5 years	$ 63,622,000	63,481,000
5 to 10 years	119,960,000	69,955,000
Over 10 years		50,000,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, within 1 year		325,000
Gross unrealized gains, 1 to 5 years	2,083,000	928,000
Gross unrealized gains, 5 to 10 years	210,000	0
Gross unrealized gains, over 10 years		938,000
Gross unrealized losses, within 1 year		(53,000)
Gross unrealized losses, 1 to 5 years	0	(113,000)
Gross unrealized losses, 5 to 10 years	(577,000)	(2,417,000)
Gross unrealized losses, over 10 years		0
Fair Value, Available-for-sale securities
Within 1 year		278,366,000
1 to 5 years	65,705,000	64,296,000
5 to 10 years	$ 119,593,000	67,538,000
Over 10 years		$ 50,938,000
Yield, Available-for-sale securities
Within 1 year		1.33%
1 to 5 years	2.96%	2.47%
5 to 10 years	2.62%	1.96%
Over 10 years		3.00%
Municipal bonds
Amortized Cost, Available-for-sale securities
Within 1 year	$ 2,344,000
1 to 5 years	1,367,000	$ 2,315,000
5 to 10 years		1,335,000
Over 10 years	20,343,000	20,363,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, within 1 year	10,000
Gross unrealized gains, 1 to 5 years	55,000	2,000
Gross unrealized gains, 5 to 10 years		38,000
Gross unrealized gains, over 10 years	2,505,000	3,617,000
Gross unrealized losses, within 1 year	0
Gross unrealized losses, 1 to 5 years	0	0
Gross unrealized losses, 5 to 10 years		0
Gross unrealized losses, over 10 years	0	0
Fair Value, Available-for-sale securities
Within 1 year	2,354,000
1 to 5 years	1,422,000	2,317,000
5 to 10 years		1,373,000
Over 10 years	$ 22,848,000	$ 23,980,000
Yield, Available-for-sale securities
Within 1 year	1.23%
1 to 5 years	2.05%	1.23%
5 to 10 years		2.05%
Over 10 years	6.45%	6.45%
Agency pass through mortgage-backed securities
Amortized Cost, Available-for-sale securities
Without single maturity date	$ 828,069,000	$ 978,955,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, without single maturity date	8,402,000	17,118,000
Gross unrealized losses, without single maturity date	(2,174,000)	(3,032,000)
Fair Value, Available-for-sale securities
Without single maturity date	$ 834,297,000	$ 993,041,000
Yield, Available-for-sale securities
Without single maturity date	2.96%	2.58%
Amortized Cost, Held-to-maturity securities
Without single maturity date	$ 1,646,856,000	$ 1,417,599,000
Gross Unrealized Gains / Losses, Held-to-maturity securities
Gross unrealized gains, without single maturity date	7,143,000	24,171,000
Gross unrealized losses, without single maturity date	(18,086,000)	(214,000)
Fair Value, Held-to-maturity securities
Without single maturity date	$ 1,635,913,000	$ 1,441,556,000
Yield, Held-to-maturity securities
Without a single maturity date	3.14%	3.18%
Commercial MBS
Amortized Cost, Available-for-sale securities
Without single maturity date	$ 8,350,000	$ 80,318,000
Gross Unrealized Gains / Losses, Available-for-sale securities
Gross unrealized gains, without single maturity date	41,000	0
Gross unrealized losses, without single maturity date	0	(448,000)
Fair Value, Available-for-sale securities
Without single maturity date	$ 8,391,000	$ 79,870,000
Yield, Available-for-sale securities
Without single maturity date	3.31%	1.91%

Investment Securities - Securit

Investment Securities - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months	$ (18,442)	$ (1,289)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months	1,187,758	304,197
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer	(3,851)	(10,637)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer	394,922	553,487
Unrealized gross losses of AFS securities, continuous unrealized loss position	(22,293)	(11,926)
Fair value of AFS securities, continuous unrealized loss position	1,582,680	857,684
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months	0	0
Fair value of AFS securities, continuous unrealized loss position, less than 12 months	0	0
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer	(577)	(2,582)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer	49,423	100,467
Unrealized gross losses of AFS securities, continuous unrealized loss position	(577)	(2,582)
Fair value of AFS securities, continuous unrealized loss position	49,423	100,467
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months	(759)	(11)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months	24,400	3,167
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer	(697)	(5,638)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer	96,195	220,613
Unrealized gross losses of AFS securities, continuous unrealized loss position	(1,456)	(5,649)
Fair value of AFS securities, continuous unrealized loss position	120,595	223,780
Agency pass through mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized gross losses of AFS securities, continuous unrealized loss position, less than 12 months	(17,683)	(1,278)
Fair value of AFS securities, continuous unrealized loss position, less than 12 months	1,163,358	301,030
Unrealized gross losses of AFS securities, continuous unrealized loss position, 12 months or longer	(2,577)	(2,417)
Fair value of AFS securities, continuous unrealized loss position, 12 months or longer	249,304	232,407
Unrealized gross losses of AFS securities, continuous unrealized loss position	(20,260)	(3,695)
Fair value of AFS securities, continuous unrealized loss position	$ 1,412,662	$ 533,437

Loans Receivable - Schedule of

Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 12,201,387	$ 10,950,608
Ratio of type of loan to total loans receivable	100.00%	100.00%
Allowance for probable losses	$ 123,073	$ 113,494	$ 106,829
Loans in process	1,149,934	879,484
Net deferred fees, costs and discounts	45,758	46,710
Total loan contra accounts	1,318,765	1,039,688
Net loans	10,882,622	9,910,920
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,711,004	$ 5,658,830
Ratio of type of loan to total loans receivable	46.80%	51.70%
Allowance for probable losses	$ 36,892	$ 37,796	47,347
Construction - speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,597,996	$ 1,110,411
Ratio of type of loan to total loans receivable	13.10%	10.10%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 602,631	$ 473,069
Ratio of type of loan to total loans receivable	4.90%	4.30%
Allowance for probable losses	$ 1,944	$ 1,080	990
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 124,308	$ 118,497
Ratio of type of loan to total loans receivable	1.00%	1.10%
Allowance for probable losses	$ 6,829	$ 6,023	5,781
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 104,405	$ 104,567
Ratio of type of loan to total loans receivable	0.90%	1.00%
Allowance for probable losses	$ 2,649	$ 2,535	2,946
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,303,148	$ 1,124,290
Ratio of type of loan to total loans receivable	10.70%	10.30%
Allowance for probable losses	$ 7,862	$ 6,925	5,304
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,434,610	$ 1,093,639
Ratio of type of loan to total loans receivable	11.80%	10.00%
Allowance for probable losses	$ 11,818	$ 8,588	8,960
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,093,360	$ 978,589
Ratio of type of loan to total loans receivable	9.00%	8.90%
Allowance for probable losses	$ 28,524	$ 28,008	24,980
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 144,850	$ 149,716
Ratio of type of loan to total loans receivable	1.20%	1.40%
Allowance for probable losses	$ 855	$ 813	902
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 85,075	$ 139,000
Ratio of type of loan to total loans receivable	0.70%	1.30%
Allowance for probable losses	$ 1,144	$ 1,888	$ 2,939

Loans Receivable - Interest Rat

Loans Receivable - Interest Rate Terms (Details) $ in Thousands	Sep. 30, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 7,408,460
Loans at fixed-rate, percent	60.70%
Loans at adjustable-rate	$ 4,792,927
Loans at adjustable-rate, percent	39.30%
Within 1 year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 71,810
Loans at fixed-rate, percent	0.60%
Loans at adjustable-rate	$ 3,157,055
Loans at adjustable-rate, percent	25.90%
1 to 3 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 216,724
Loans at fixed-rate, percent	1.80%
Loans at adjustable-rate	$ 498,844
Loans at adjustable-rate, percent	4.10%
3 to 5 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 308,967
Loans at fixed-rate, percent	2.50%
Loans at adjustable-rate	$ 624,254
Loans at adjustable-rate, percent	5.10%
5 to 10 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 847,518
Loans at fixed-rate, percent	6.90%
Loans at adjustable-rate	$ 512,774
Loans at adjustable-rate, percent	4.20%
10 to 20 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 1,047,541
Loans at fixed-rate, percent	8.60%
Loans at adjustable-rate	$ 0
Loans at adjustable-rate, percent	0.00%
Over 20 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 4,915,900
Loans at fixed-rate, percent	40.30%
Loans at adjustable-rate	$ 0
Loans at adjustable-rate, percent	0.00%

Loans Receivable - Loans Receiv

Loans Receivable - Loans Receivable by Geographic Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 12,201,387	$ 10,950,608
Ratio of loans by geographic location to total loans	100.00%
Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,594,887
Ratio of loans by geographic location to total loans	45.80%
Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,901,887
Ratio of loans by geographic location to total loans	15.60%
Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,400,637
Ratio of loans by geographic location to total loans	11.40%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 345,940
Ratio of loans by geographic location to total loans	2.90%
Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 961,893
Ratio of loans by geographic location to total loans	7.90%
Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 538,886
Ratio of loans by geographic location to total loans	4.50%
New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 612,473
Ratio of loans by geographic location to total loans	4.90%
Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 565,910
Ratio of loans by geographic location to total loans	4.60%
Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 278,874
Ratio of loans by geographic location to total loans	2.40%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,711,004	5,658,830
Ratio of loans by geographic location to total loans	46.70%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Single-family residential | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 3,013,957
Ratio of loans by geographic location to total loans	24.60%
Percentage of loans by geographic area as a percentage of loan type	52.80%
Single-family residential | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 659,602
Ratio of loans by geographic location to total loans	5.40%
Percentage of loans by geographic area as a percentage of loan type	11.50%
Single-family residential | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 581,137
Ratio of loans by geographic location to total loans	4.80%
Percentage of loans by geographic area as a percentage of loan type	10.20%
Single-family residential | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 57,891
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	1.00%
Single-family residential | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 514,922
Ratio of loans by geographic location to total loans	4.20%
Percentage of loans by geographic area as a percentage of loan type	9.00%
Single-family residential | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 306,853
Ratio of loans by geographic location to total loans	2.50%
Percentage of loans by geographic area as a percentage of loan type	5.40%
Single-family residential | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 202,703
Ratio of loans by geographic location to total loans	1.70%
Percentage of loans by geographic area as a percentage of loan type	3.50%
Single-family residential | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 185,835
Ratio of loans by geographic location to total loans	1.50%
Percentage of loans by geographic area as a percentage of loan type	3.30%
Single-family residential | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 188,104
Ratio of loans by geographic location to total loans	1.50%
Percentage of loans by geographic area as a percentage of loan type	3.30%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,303,148	1,124,290
Ratio of loans by geographic location to total loans	10.70%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Multi-family | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 315,356
Ratio of loans by geographic location to total loans	2.60%
Percentage of loans by geographic area as a percentage of loan type	24.20%
Multi-family | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 378,588
Ratio of loans by geographic location to total loans	3.10%
Percentage of loans by geographic area as a percentage of loan type	29.10%
Multi-family | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 340,609
Ratio of loans by geographic location to total loans	2.80%
Percentage of loans by geographic area as a percentage of loan type	26.10%
Multi-family | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 3,423
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.30%
Multi-family | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 40,014
Ratio of loans by geographic location to total loans	0.30%
Percentage of loans by geographic area as a percentage of loan type	3.10%
Multi-family | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 41,243
Ratio of loans by geographic location to total loans	0.40%
Percentage of loans by geographic area as a percentage of loan type	3.20%
Multi-family | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 115,289
Ratio of loans by geographic location to total loans	0.90%
Percentage of loans by geographic area as a percentage of loan type	8.80%
Multi-family | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 43,493
Ratio of loans by geographic location to total loans	0.40%
Percentage of loans by geographic area as a percentage of loan type	3.30%
Multi-family | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 25,133
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	1.90%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 124,308	118,497
Ratio of loans by geographic location to total loans	1.00%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Land - acquisition & development | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 55,794
Ratio of loans by geographic location to total loans	0.40%
Percentage of loans by geographic area as a percentage of loan type	44.90%
Land - acquisition & development | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 33,109
Ratio of loans by geographic location to total loans	0.30%
Percentage of loans by geographic area as a percentage of loan type	26.60%
Land - acquisition & development | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 4,801
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	3.90%
Land - acquisition & development | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 0
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
Land - acquisition & development | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 90
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.10%
Land - acquisition & development | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 14,593
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	11.70%
Land - acquisition & development | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 10,272
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	8.30%
Land - acquisition & development | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 5,649
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	4.50%
Land - acquisition & development | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 0
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	0.00%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 104,405	104,567
Ratio of loans by geographic location to total loans	0.90%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Land - consumer lot loans | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 65,449
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	62.60%
Land - consumer lot loans | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,535
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	13.00%
Land - consumer lot loans | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 11,446
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	11.00%
Land - consumer lot loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 69
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.10%
Land - consumer lot loans | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 4,321
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	4.10%
Land - consumer lot loans | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 4,586
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	4.40%
Land - consumer lot loans | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,108
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	2.00%
Land - consumer lot loans | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 106
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.10%
Land - consumer lot loans | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,785
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	2.70%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 602,631	473,069
Ratio of loans by geographic location to total loans	4.90%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Construction - custom | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 357,080
Ratio of loans by geographic location to total loans	2.90%
Percentage of loans by geographic area as a percentage of loan type	59.40%
Construction - custom | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 59,861
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	9.90%
Construction - custom | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 77,315
Ratio of loans by geographic location to total loans	0.60%
Percentage of loans by geographic area as a percentage of loan type	12.80%
Construction - custom | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 0
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
Construction - custom | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 55,064
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	9.10%
Construction - custom | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 23,721
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	3.90%
Construction - custom | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 17,406
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	2.90%
Construction - custom | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 3,534
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.60%
Construction - custom | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 8,650
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	1.40%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,597,996	1,110,411
Ratio of loans by geographic location to total loans	13.10%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Construction | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 613,362
Ratio of loans by geographic location to total loans	5.10%
Percentage of loans by geographic area as a percentage of loan type	38.30%
Construction | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 269,037
Ratio of loans by geographic location to total loans	2.20%
Percentage of loans by geographic area as a percentage of loan type	16.80%
Construction | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 102,546
Ratio of loans by geographic location to total loans	0.80%
Percentage of loans by geographic area as a percentage of loan type	6.40%
Construction | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 4,360
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.30%
Construction | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 272,723
Ratio of loans by geographic location to total loans	2.20%
Percentage of loans by geographic area as a percentage of loan type	17.10%
Construction | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 45,603
Ratio of loans by geographic location to total loans	0.40%
Percentage of loans by geographic area as a percentage of loan type	2.90%
Construction | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 62,635
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	3.90%
Construction | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 205,595
Ratio of loans by geographic location to total loans	1.70%
Percentage of loans by geographic area as a percentage of loan type	12.90%
Construction | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 22,135
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	1.40%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,434,610	1,093,639
Ratio of loans by geographic location to total loans	11.80%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Commercial real estate | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 528,762
Ratio of loans by geographic location to total loans	4.40%
Percentage of loans by geographic area as a percentage of loan type	36.90%
Commercial real estate | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 254,513
Ratio of loans by geographic location to total loans	2.10%
Percentage of loans by geographic area as a percentage of loan type	17.70%
Commercial real estate | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 218,200
Ratio of loans by geographic location to total loans	1.80%
Percentage of loans by geographic area as a percentage of loan type	15.20%
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 95,304
Ratio of loans by geographic location to total loans	0.80%
Percentage of loans by geographic area as a percentage of loan type	6.60%
Commercial real estate | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 28,586
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	2.00%
Commercial real estate | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 65,342
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	4.60%
Commercial real estate | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 173,774
Ratio of loans by geographic location to total loans	1.40%
Percentage of loans by geographic area as a percentage of loan type	12.10%
Commercial real estate | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 61,439
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	4.30%
Commercial real estate | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 8,690
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	0.60%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,093,360	978,589
Ratio of loans by geographic location to total loans	9.00%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Commercial & industrial | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 555,651
Ratio of loans by geographic location to total loans	4.60%
Percentage of loans by geographic area as a percentage of loan type	50.90%
Commercial & industrial | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 217,813
Ratio of loans by geographic location to total loans	1.80%
Percentage of loans by geographic area as a percentage of loan type	19.90%
Commercial & industrial | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 50,506
Ratio of loans by geographic location to total loans	0.40%
Percentage of loans by geographic area as a percentage of loan type	4.60%
Commercial & industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 106,226
Ratio of loans by geographic location to total loans	0.90%
Percentage of loans by geographic area as a percentage of loan type	9.70%
Commercial & industrial | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 38,328
Ratio of loans by geographic location to total loans	0.30%
Percentage of loans by geographic area as a percentage of loan type	3.50%
Commercial & industrial | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 29,529
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	2.70%
Commercial & industrial | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 14,186
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	1.30%
Commercial & industrial | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 59,484
Ratio of loans by geographic location to total loans	0.50%
Percentage of loans by geographic area as a percentage of loan type	5.40%
Commercial & industrial | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 21,637
Ratio of loans by geographic location to total loans	0.20%
Percentage of loans by geographic area as a percentage of loan type	2.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 85,075	139,000
Ratio of loans by geographic location to total loans	0.70%
Percentage of loans by geographic area as a percentage of loan type	100.00%
Consumer | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,186
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	2.80%
Consumer | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,252
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	2.60%
Consumer | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 296
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.30%
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 78,614
Ratio of loans by geographic location to total loans	0.70%
Percentage of loans by geographic area as a percentage of loan type	92.40%
Consumer | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 22
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
Consumer | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 123
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.10%
Consumer | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 768
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.90%
Consumer | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 775
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.90%
Consumer | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 39
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 144,850	149,716
Ratio of loans by geographic location to total loans	1.20%
Percentage of loans by geographic area as a percentage of loan type	100.00%
HELOC | Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 87,290
Ratio of loans by geographic location to total loans	0.70%
Percentage of loans by geographic area as a percentage of loan type	60.30%
HELOC | Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,577
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	9.40%
HELOC | Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,781
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	9.50%
HELOC | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 53
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
HELOC | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 7,823
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	5.40%
HELOC | Idaho
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 7,293
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	5.00%
HELOC | New Mexico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 13,332
Ratio of loans by geographic location to total loans	0.10%
Percentage of loans by geographic area as a percentage of loan type	9.20%
HELOC | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 0
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	0.00%
HELOC | Nevada
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,701
Ratio of loans by geographic location to total loans	0.00%
Percentage of loans by geographic area as a percentage of loan type	1.20%
Loans Receivable from Related Party Including Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans granted to officers, directors, and related interests	$ 84,166	$ 57,153

Loans Receivable - Loans Impair

Loans Receivable - Loans Impaired, Loan Commitments and Loans Serviced (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Receivables [Abstract]
Recorded investment in impaired loans	$ 251,274	$ 285,243
TDRs included in impaired loans	207,377	261,531
Allocated reserves on impaired loans	1,363	1,980
Specific reserves on impaired loans	126	366
Average balance of impaired loans for year ended	274,530	301,685
Interest income from impaired loans for year ended	11,736	12,843
Outstanding fixed-rate origination commitments	425,130	331,947
Gross loans serviced for others	$ 77,119	$ 80,896

Loans Receivable - Loans on Non

Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 49,580	$ 42,414
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	100.00%	100.00%
Nonaccrual, percent of total loans	0.43%	0.46%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 27,930	$ 33,148
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	56.30%	78.20%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 91	$ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.20%	0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 296	$ 58
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.60%	0.10%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 605	$ 510
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	1.20%	1.20%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 139	$ 776
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.30%	1.80%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 11,815	$ 7,100
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	23.80%	16.70%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 8,082	$ 583
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	16.30%	1.40%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 531	$ 239
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	1.10%	0.60%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 91	$ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.20%	0.00%

Loans Receivable - Breakdown of

Loans Receivable - Breakdown of Delinquent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 11,051,453
Recorded investment, current	11,007,440
Recorded investment, past due	$ 44,013
Ratio of total past due loans to total loans	0.40%	0.68%
Delinquency %, current	99.60%
Delinquency %, past due	0.40%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 5,709,690
Recorded investment, current	5,671,933
Recorded investment, past due	$ 37,757
Ratio of total past due loans to total loans	0.66%
Construction - speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 793,959
Recorded investment, current	793,959
Recorded investment, past due	$ 0
Ratio of total past due loans to total loans	0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 277,599
Recorded investment, current	277,508
Recorded investment, past due	$ 91
Ratio of total past due loans to total loans	0.03%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 104,856
Recorded investment, current	104,526
Recorded investment, past due	$ 330
Ratio of total past due loans to total loans	0.31%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 104,335
Recorded investment, current	103,389
Recorded investment, past due	$ 946
Ratio of total past due loans to total loans	0.91%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 1,303,119
Recorded investment, current	1,302,720
Recorded investment, past due	$ 399
Ratio of total past due loans to total loans	0.03%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 1,434,610
Recorded investment, current	1,432,052
Recorded investment, past due	$ 2,558
Ratio of total past due loans to total loans	0.18%
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 1,093,360
Recorded investment, current	1,092,735
Recorded investment, past due	$ 625
Ratio of total past due loans to total loans	0.06%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 144,850
Recorded investment, current	143,974
Recorded investment, past due	$ 876
Ratio of total past due loans to total loans	0.60%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net of Charge Offs and Loans in Process	$ 85,075
Recorded investment, current	84,644
Recorded investment, past due	$ 431
Ratio of total past due loans to total loans	0.51%
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 12,015
Delinquency %, past due	0.11%
30 Days Delinquent | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 10,925
30 Days Delinquent | Construction - speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
30 Days Delinquent | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
30 Days Delinquent | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
30 Days Delinquent | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	112
30 Days Delinquent | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	5
30 Days Delinquent | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	507
30 Days Delinquent | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
30 Days Delinquent | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	221
30 Days Delinquent | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	245
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 6,245
Delinquency %, past due	0.06%
60 Days Delinquent | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 4,810
60 Days Delinquent | Construction - speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
60 Days Delinquent | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
60 Days Delinquent | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
60 Days Delinquent | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	680
60 Days Delinquent | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	255
60 Days Delinquent | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
60 Days Delinquent | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	51
60 Days Delinquent | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	342
60 Days Delinquent | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	107
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 25,753
Delinquency %, past due	0.23%
90 Days Delinquent | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 22,022
90 Days Delinquent | Construction - speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	0
90 Days Delinquent | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	91
90 Days Delinquent | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	330
90 Days Delinquent | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	154
90 Days Delinquent | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	139
90 Days Delinquent | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	2,051
90 Days Delinquent | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	574
90 Days Delinquent | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	313
90 Days Delinquent | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment, past due	$ 79

Loans Receivable - Troubled Deb

Loans Receivable - Troubled Debt Restructurings and Loan Modifications (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Approximate rate reduction concession, minimum	1.00%
Approximate rate reduction concession, maximum	2.00%
TDRs included in impaired loans	$ 207,377	$ 261,531
Percent of restructured loans performing	97.50%
Single family residential loans as percentage of restructured loans	87.70%
Number of contracts | contract	44	139
Pre-modification, outstanding recorded investment	$ 7,878	$ 27,184
Post-modification, outstanding recorded investment	$ 7,878	$ 27,184
Subsequent default, number of contracts | contract	26	25
Subsequent default, recorded investment	$ 4,481	$ 6,086
Single-family residential
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	38	120
Pre-modification, outstanding recorded investment	$ 7,115	$ 23,541
Post-modification, outstanding recorded investment	$ 7,115	$ 23,541
Subsequent default, number of contracts | contract	24	17
Subsequent default, recorded investment	$ 4,214	$ 4,875
Construction
Financing Receivable, Modifications [Line Items]
Subsequent default, number of contracts | contract	0	1
Subsequent default, recorded investment	$ 0	$ 279
Land - consumer lot loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	10
Pre-modification, outstanding recorded investment	$ 211	$ 970
Post-modification, outstanding recorded investment	$ 211	$ 970
Subsequent default, number of contracts | contract	0	5
Subsequent default, recorded investment	$ 0	$ 606
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	7
Pre-modification, outstanding recorded investment	$ 0	$ 2,523
Post-modification, outstanding recorded investment	$ 0	$ 2,523
Subsequent default, number of contracts | contract	2	2
Subsequent default, recorded investment	$ 267	$ 326
HELOC
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	1
Pre-modification, outstanding recorded investment	$ 552	$ 126
Post-modification, outstanding recorded investment	$ 552	$ 126
Consumer
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	1
Pre-modification, outstanding recorded investment	$ 0	$ 24
Post-modification, outstanding recorded investment	$ 0	$ 24
Minimum
Financing Receivable, Modifications [Line Items]
Term for payment and rate reduction	6 months
Maximum
Financing Receivable, Modifications [Line Items]
Term for payment and rate reduction	12 months

Loans Receivable - Schedule o52

Loans Receivable - Schedule of Covered Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 12,201,387	$ 10,950,608
FDIC Indemnification Asset Movement Analysis
Balance at beginning of year	12,769	16,275
Payments received	(584)	(1,730)
Amortization	(3,450)	(2,012)
Accretion	232	236
Balance at end of year	8,967	12,769
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 20,572	$ 28,974

Allowance for Losses on Loans -

Allowance for Losses on Loans - Allowance for Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	$ 113,494	$ 106,829
Charge-offs	(2,700)	(6,000)
Recoveries	17,007	19,065
Provision & Transfers	(4,728)	(6,400)
Ending Allowance	123,073	113,494
Single-family residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	37,796	47,347
Charge-offs	(1,229)	(3,106)
Recoveries	653	3,251
Provision & Transfers	(328)	(9,696)
Ending Allowance	36,892	37,796
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	19,838	6,680
Charge-offs	0	0
Recoveries	0	745
Provision & Transfers	4,718	12,413
Ending Allowance	24,556	19,838
Construction - custom
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,080	990
Charge-offs	(16)	(60)
Recoveries	0	60
Provision & Transfers	880	90
Ending Allowance	1,944	1,080
Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	6,023	5,781
Charge-offs	(280)	(42)
Recoveries	11,038	8,220
Provision & Transfers	(9,952)	(7,936)
Ending Allowance	6,829	6,023
Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	2,535	2,946
Charge-offs	(17)	(732)
Recoveries	481	5
Provision & Transfers	(350)	316
Ending Allowance	2,649	2,535
Multi-family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	6,925	5,304
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	937	1,621
Ending Allowance	7,862	6,925
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	8,588	8,960
Charge-offs	(11)	(103)
Recoveries	1,684	1,812
Provision & Transfers	1,557	(2,081)
Ending Allowance	11,818	8,588
Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	28,008	24,980
Charge-offs	(173)	(941)
Recoveries	1,833	2,933
Provision & Transfers	(1,144)	1,036
Ending Allowance	28,524	28,008
HELOC
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	813	902
Charge-offs	(90)	(54)
Recoveries	21	21
Provision & Transfers	111	(56)
Ending Allowance	855	813
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,888	2,939
Charge-offs	(884)	(962)
Recoveries	1,297	2,018
Provision & Transfers	(1,157)	(2,107)
Ending Allowance	$ 1,144	$ 1,888

Allowance for Losses on Loans54

Allowance for Losses on Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision (release) for loan losses	$ (500)	$ 0	$ (1,600)	$ 0	$ (3,100)	$ (1,650)	$ (1,500)	$ 0	$ (2,100)	$ (6,250)	$ (11,162)
Provision (release) for loan, lease, and other losses									(4,728)	(6,400)
Allowance for credit losses, recoveries, net of charge-offs									14,307	13,065
Nonaccrual loans by portfolio segment	49,580				42,414				49,580	42,414
Loans receivable, gross	12,201,387				10,950,608				12,201,387	10,950,608
Allowance for probable losses	123,073				113,494				123,073	113,494	$ 106,829
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	11,000,212				9,784,140				11,000,212	9,784,140
Allowance for probable losses	122,947				113,128				122,947	113,128
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	28,553				34,271				28,553	34,271
Allowance for probable losses	126				366				126	366
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	20,572				28,974				20,572	28,974
Non-Performing Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Nonaccrual loans by portfolio segment	49,580				42,414				49,580	42,414
Loans receivable, gross	$ 70,238				$ 71,441				$ 70,238	$ 71,441
Ratio of non-performing assets to total assets	0.46%				0.48%				0.46%	0.48%
Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	$ 107,675				$ 154,026				$ 107,675	$ 154,026
Substandard | Acquired and Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	$ 20,224				$ 35,910				$ 20,224	$ 35,910

Allowance for Losses on Loans55

Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 123,073	$ 113,494	$ 106,829
Recorded investment of loans	12,201,387	10,950,608
Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	36,892	37,796	47,347
Recorded investment of loans	5,711,004	5,658,830
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	24,556	19,838	6,680
Recorded investment of loans	1,597,996	1,110,411
Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,944	1,080	990
Recorded investment of loans	602,631	473,069
Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	6,829	6,023	5,781
Recorded investment of loans	124,308	118,497
Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	2,649	2,535	2,946
Recorded investment of loans	104,405	104,567
Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	7,862	6,925	5,304
Recorded investment of loans	1,303,148	1,124,290
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	11,818	8,588	8,960
Recorded investment of loans	1,434,610	1,093,639
Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	28,524	28,008	24,980
Recorded investment of loans	1,093,360	978,589
HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	855	813	902
Recorded investment of loans	144,850	149,716
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,144	1,888	$ 2,939
Recorded investment of loans	85,075	139,000
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	122,947	113,128
Recorded investment of loans	$ 11,000,212	$ 9,784,140
Ratio	1.10%	1.20%
Loans Collectively Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 36,893	$ 37,536
Recorded investment of loans	$ 5,713,576	$ 5,585,912
Ratio	0.70%	0.70%
Loans Collectively Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 24,556	$ 19,838
Recorded investment of loans	$ 793,958	$ 498,450
Ratio	3.10%	4.00%
Loans Collectively Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 1,944	$ 1,080
Recorded investment of loans	$ 277,495	$ 229,298
Ratio	0.70%	0.50%
Loans Collectively Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 6,828	$ 6,022
Recorded investment of loans	$ 104,767	$ 90,850
Ratio	6.50%	6.60%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 2,649	$ 2,535
Recorded investment of loans	$ 96,337	$ 92,828
Ratio	2.80%	2.70%
Loans Collectively Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 7,857	$ 6,911
Recorded investment of loans	$ 1,302,625	$ 1,091,974
Ratio	0.60%	0.60%
Loans Collectively Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 11,697	$ 8,497
Recorded investment of loans	$ 1,391,668	$ 957,380
Ratio	0.80%	0.90%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 28,524	$ 28,008
Recorded investment of loans	$ 1,093,210	$ 966,930
Ratio	2.60%	2.90%
Loans Collectively Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 855	$ 813
Recorded investment of loans	$ 141,689	$ 133,203
Ratio	0.60%	0.60%
Loans Collectively Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 1,144	$ 1,888
Recorded investment of loans	$ 84,887	$ 137,315
Ratio	1.40%	1.40%
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 126	$ 366
Recorded investment of loans	$ 28,553	$ 34,271
Ratio	0.40%	1.10%
Loans Individually Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 260
Recorded investment of loans	$ 5,552	$ 19,629
Ratio	0.00%	1.30%
Loans Individually Evaluated for Impairment | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 0	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 105	$ 330
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 1	$ 2
Recorded investment of loans	$ 89	$ 850
Ratio	1.00%	0.20%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 171	$ 558
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 5	$ 13
Recorded investment of loans	$ 493	$ 1,505
Ratio	1.00%	0.90%
Loans Individually Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 120	$ 91
Recorded investment of loans	$ 21,765	$ 11,157
Ratio	0.60%	0.80%
Loans Individually Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 81	$ 0
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 215	$ 239
Ratio	0.00%	0.00%
Loans Individually Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 0	$ 0
Recorded investment of loans	$ 82	$ 3
Ratio	0.00%	0.00%

Allowance for Losses on Loans56

Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,201,387	$ 10,950,608
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,711,004	5,658,830
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,597,996	1,110,411
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	602,631	473,069
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	124,308	118,497
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	104,405	104,567
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,303,148	1,124,290
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,434,610	1,093,639
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,093,360	978,589
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	144,850	149,716
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	85,075	139,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,066,952	$ 10,764,097
Grade as percentage of total gross loans	98.90%	98.30%
Pass | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,671,229	$ 5,607,521
Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,594,926	1,098,549
Pass | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	602,540	473,069
Pass | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	123,028	111,225
Pass | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	103,787	103,528
Pass | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,295,261	1,117,437
Pass | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,391,996	1,033,880
Pass | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,054,972	930,776
Pass | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	144,229	149,195
Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	84,984	138,917
Special mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 26,760	$ 32,485
Grade as percentage of total gross loans	0.20%	0.30%
Special mention | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Special mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	8,595
Special mention | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	207	0
Special mention | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,795	3,237
Special mention | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,944	13,446
Special mention | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	14,814	7,207
Special mention | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Special mention | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 107,675	$ 154,026
Grade as percentage of total gross loans	0.90%	1.40%
Substandard | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 39,775	$ 51,309
Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,070	3,267
Substandard | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	91	0
Substandard | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,073	7,272
Substandard | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	618	1,039
Substandard | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,092	3,616
Substandard | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	36,670	46,313
Substandard | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	23,574	40,606
Substandard | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	621	521
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	91	83
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Grade as percentage of total gross loans	0.00%	0.00%
Doubtful | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Doubtful | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Doubtful | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Grade as percentage of total gross loans	0.00%	0.00%
Loss | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0
Loss | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Loss | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 0	$ 0

Allowance for Losses on Loans57

Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,201,387	$ 10,950,608
Nonaccrual loans by portfolio segment	49,580	42,414
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,711,004	5,658,830
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,597,996	1,110,411
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	602,631	473,069
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	124,308	118,497
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	104,405	104,567
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,303,148	1,124,290
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,434,610	1,093,639
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,093,360	978,589
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	144,850	149,716
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	85,075	139,000
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 12,151,807	$ 10,908,194
Grade as percentage of total gross assets	99.60%	99.60%
Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 5,683,074	$ 5,625,682
Grade as percentage of total gross assets	99.50%	99.40%
Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,597,996	$ 1,110,411
Grade as percentage of total gross assets	100.00%	100.00%
Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 602,540	$ 473,069
Grade as percentage of total gross assets	99.90%	100.00%
Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 124,012	$ 118,439
Grade as percentage of total gross assets	99.80%	99.90%
Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 103,800	$ 104,057
Grade as percentage of total gross assets	99.40%	99.50%
Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,303,009	$ 1,123,583
Grade as percentage of total gross assets	99.90%	99.90%
Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,422,795	$ 1,086,470
Grade as percentage of total gross assets	99.20%	99.30%
Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 1,085,278	$ 978,006
Grade as percentage of total gross assets	99.30%	99.90%
Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 144,319	$ 149,477
Grade as percentage of total gross assets	99.60%	99.80%
Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 84,984	$ 139,000
Grade as percentage of total gross assets	99.90%	100.00%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 70,238	$ 71,441
Nonaccrual loans by portfolio segment	$ 49,580	$ 42,414
Percentage of total gross loans	0.40%	0.40%
Non-Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 27,930	$ 33,148
Percentage of total gross loans	0.50%	0.60%
Non-Performing Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 0	$ 0
Percentage of total gross loans	0.00%	0.00%
Non-Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 91	$ 0
Percentage of total gross loans	0.10%	0.00%
Non-Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 296	$ 58
Percentage of total gross loans	0.20%	0.10%
Non-Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 605	$ 510
Percentage of total gross loans	0.60%	0.50%
Non-Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 139	$ 776
Percentage of total gross loans	0.10%	0.10%
Non-Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 11,815	$ 7,100
Percentage of total gross loans	0.80%	0.70%
Non-Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 8,082	$ 583
Percentage of total gross loans	0.70%	0.10%
Non-Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 531	$ 239
Percentage of total gross loans	0.40%	0.20%
Non-Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 91	$ 0
Percentage of total gross loans	0.10%	0.00%

Allowance for Losses on Loans58

Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 251,274	$ 285,243
Unpaid principal balance	289,340	321,743
Related allowance	4,156	3,915
Average recorded investment	274,530	301,685
Amount of related allowance included in specific reserves	126	366
Amount of related allowance included in general reserves	4,030	3,549
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded investment	203,266	237,813
Unpaid principal balance	210,047	243,961
Related allowance	4,030	3,809
Average recorded investment	224,094	250,805
Construction
Financing Receivable, Impaired [Line Items]
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	1,089
Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded investment	148	0
Unpaid principal balance	165	0
Related allowance	0	0
Average recorded investment	231	603
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded investment	420	1,292
Unpaid principal balance	8,298	11,095
Related allowance	1	1
Average recorded investment	752	2,485
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded investment	8,157	10,129
Unpaid principal balance	8,856	11,287
Related allowance	0	1
Average recorded investment	9,407	10,917
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded investment	632	1,899
Unpaid principal balance	3,724	5,477
Related allowance	5	13
Average recorded investment	1,772	3,438
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	27,969	31,175
Unpaid principal balance	39,194	44,149
Related allowance	120	91
Average recorded investment	28,457	28,992
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded investment	8,279	1,030
Unpaid principal balance	14,321	3,082
Related allowance	0	0
Average recorded investment	7,722	1,205
HELOC
Financing Receivable, Impaired [Line Items]
Recorded investment	2,218	1,715
Unpaid principal balance	3,018	1,836
Related allowance	0	0
Average recorded investment	1,938	1,815
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	185	190
Unpaid principal balance	1,717	856
Related allowance	0	0
Average recorded investment	157	336
Scenario, Previously Reported
Financing Receivable, Impaired [Line Items]
Average recorded investment		265,771
No Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded investment	43,897	23,712
Unpaid principal balance	75,267	50,196
Related allowance	0	0
Average recorded investment	40,392	25,725
No Allowance Recorded | Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded investment	21,325	9,627
Unpaid principal balance	23,880	11,366
Related allowance	0	0
Average recorded investment	19,371	12,618
No Allowance Recorded | Construction
Financing Receivable, Impaired [Line Items]
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	91
No Allowance Recorded | Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded investment	148	0
Unpaid principal balance	165	0
Related allowance	0	0
Average recorded investment	231	603
No Allowance Recorded | Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded investment	330	138
Unpaid principal balance	8,208	9,001
Related allowance	0	0
Average recorded investment	176	720
No Allowance Recorded | Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded investment	208	499
Unpaid principal balance	330	609
Related allowance	0	0
Average recorded investment	431	587
No Allowance Recorded | Multi-family
Financing Receivable, Impaired [Line Items]
Recorded investment	139	394
Unpaid principal balance	3,231	3,972
Related allowance	0	0
Average recorded investment	748	1,279
No Allowance Recorded | Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	12,890	11,741
Unpaid principal balance	22,487	21,301
Related allowance	0	0
Average recorded investment	11,466	7,994
No Allowance Recorded | Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded investment	8,279	1,030
Unpaid principal balance	14,321	3,082
Related allowance	0	0
Average recorded investment	7,425	1,205
No Allowance Recorded | HELOC
Financing Receivable, Impaired [Line Items]
Recorded investment	490	209
Unpaid principal balance	1,212	315
Related allowance	0	0
Average recorded investment	487	392
No Allowance Recorded | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	88	74
Unpaid principal balance	1,433	550
Related allowance	0	0
Average recorded investment	57	236
Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded investment	207,377	261,531
Unpaid principal balance	214,073	271,547
Related allowance	4,156	3,915
Average recorded investment	234,138	275,960
Allowance Recorded | Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded investment	181,941	228,186
Unpaid principal balance	186,167	232,595
Related allowance	4,030	3,809
Average recorded investment	204,723	238,187
Allowance Recorded | Construction
Financing Receivable, Impaired [Line Items]
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	998
Allowance Recorded | Construction - custom
Financing Receivable, Impaired [Line Items]
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	0
Allowance Recorded | Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded investment	90	1,154
Unpaid principal balance	90	2,094
Related allowance	1	1
Average recorded investment	576	1,765
Allowance Recorded | Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded investment	7,949	9,630
Unpaid principal balance	8,526	10,678
Related allowance	0	1
Average recorded investment	8,976	10,330
Allowance Recorded | Multi-family
Financing Receivable, Impaired [Line Items]
Recorded investment	493	1,505
Unpaid principal balance	493	1,505
Related allowance	5	13
Average recorded investment	1,024	2,159
Allowance Recorded | Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	15,079	19,434
Unpaid principal balance	16,707	22,848
Related allowance	120	91
Average recorded investment	16,991	20,998
Allowance Recorded | Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	297	0
Allowance Recorded | HELOC
Financing Receivable, Impaired [Line Items]
Recorded investment	1,728	1,506
Unpaid principal balance	1,806	1,521
Related allowance	0	0
Average recorded investment	1,451	1,423
Allowance Recorded | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	97	116
Unpaid principal balance	284	306
Related allowance	0	0
Average recorded investment	$ 100	$ 100

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 1,266,209	$ 1,922,894
Total Financial Assets	2,902,122	3,364,450
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,266,209	1,922,894
Interest rate contracts	1,139	20,895
Total Financial Assets	1,267,348	1,943,789
Total Financial Liabilities	3,006	55,554
Fair Value, Measurements, Recurring | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	1,139	20,895
Fair Value, Measurements, Recurring | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	174	3,312
Fair Value, Measurements, Recurring | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	1,693	31,347
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	522	101,824
Interest rate contracts	0	0
Total Financial Assets	522	101,824
Total Financial Liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,265,687	1,821,070
Interest rate contracts	1,139	20,895
Total Financial Assets	1,266,826	1,841,965
Total Financial Liabilities	3,006	55,554
Fair Value, Measurements, Recurring | Level 2 | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	1,139	20,895
Fair Value, Measurements, Recurring | Level 2 | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	174	3,312
Fair Value, Measurements, Recurring | Level 2 | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	1,693	31,347
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Interest rate contracts	0	0
Total Financial Assets	0	0
Total Financial Liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities	0	0
Equity securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	522	101,824
Equity securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	522	101,824
Equity securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Equity securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
U.S. government and agency securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	211,077	259,351
U.S. government and agency securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
U.S. government and agency securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	211,077	259,351
U.S. government and agency securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Municipal bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	26,624	27,670
Municipal bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Municipal bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	26,624	27,670
Municipal bonds | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Corporate debt securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	185,298	461,138
Corporate debt securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Corporate debt securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	185,298	461,138
Corporate debt securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Agency pass through mortgage-backed securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	834,297	993,041
Agency pass through mortgage-backed securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Agency pass through mortgage-backed securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	834,297	993,041
Agency pass through mortgage-backed securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Other commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	8,391	79,870
Other commercial mortgage-backed securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Other commercial mortgage-backed securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	8,391	79,870
Other commercial mortgage-backed securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 0	$ 0

Fair Value Measurements - Fai60

Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	$ 21,750	$ 42,666	$ 21,750	$ 42,666
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	21,750	42,666	21,750	42,666
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	9,088	17,476	9,088	17,476
Impaired loans | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Impaired loans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Impaired loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	9,088	17,476	9,088	17,476
Real estate held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	12,662	25,190	12,662	25,190
Real estate held for sale | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Real estate held for sale | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	0	0	0	0
Real estate held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on nonrecurring basis	12,662	25,190	12,662	25,190
Changes Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses related to impaired loans and real estate held for sale	(626)	(1,477)	(3,379)	(8,183)
Changes Measurement | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses related to impaired loans and real estate held for sale	(250)	(474)	(1,916)	(4,236)
Changes Measurement | Real estate held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses related to impaired loans and real estate held for sale	$ (376)	$ (1,003)	$ (1,463)	$ (3,947)

Fair Value Measurements - Fai61

Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 1,266,209	$ 1,922,894
Held-to-maturity securities	1,635,913	1,441,556
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,266,209	1,922,894
Held-to-maturity securities	1,646,856	1,417,599
Carrying Amount | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	313,070	450,368
Carrying Amount | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	522	101,824
Carrying Amount | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FHLB and FRB stock	122,990	117,205
Interest rate contracts	1,139	20,895
Customer accounts	10,835,008	10,600,852
FHLB advances and other borrowings	2,225,000	2,080,000
Carrying Amount | Level 2 | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	1,139	20,895
Carrying Amount | Level 2 | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	174	3,312
Carrying Amount | Level 2 | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	1,693	31,347
Carrying Amount | Level 2 | Agency pass through mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	1,646,856	1,417,599
Carrying Amount | Level 2 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	211,077	259,351
Carrying Amount | Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	26,624	27,670
Carrying Amount | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	185,298	461,138
Carrying Amount | Level 2 | Agency pass through mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	834,297	993,041
Carrying Amount | Level 2 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	8,391	79,870
Carrying Amount | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	10,882,622	9,910,920
FDIC indemnification asset	8,968	12,769
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,266,209	1,922,894
Held-to-maturity securities	1,635,913	1,441,556
Estimated Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	313,070	450,368
Estimated Fair Value | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	522	101,824
Estimated Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FHLB and FRB stock	122,990	117,205
Interest rate contracts	1,139	20,895
Customer accounts	10,411,686	10,184,321
FHLB advances and other borrowings	2,266,791	2,184,671
Estimated Fair Value | Level 2 | Interest rate contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	1,139	20,895
Estimated Fair Value | Level 2 | Commercial loan hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	174	3,312
Estimated Fair Value | Level 2 | Long term borrowing hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other liabilities	1,693	31,347
Estimated Fair Value | Level 2 | Agency pass through mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	1,635,913	1,441,556
Estimated Fair Value | Level 2 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	211,077	259,351
Estimated Fair Value | Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	26,624	27,670
Estimated Fair Value | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	185,298	461,138
Estimated Fair Value | Level 2 | Agency pass through mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	834,297	993,041
Estimated Fair Value | Level 2 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	8,391	79,870
Estimated Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable	11,247,586	10,414,794
FDIC indemnification asset	$ 8,564	$ 12,095

Derivatives and Hedging Activ62

Derivatives and Hedging Activities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Derivative [Line Items]
Asset derivatives, fair value	$ 1,139	$ 20,895
Liability derivatives, fair value	3,006	55,554
Interest rate swap agreements
Derivative [Line Items]
Customer derivatives program	1,035,573	840,935
Notional amount	700,000	700,000
Interest rate contract | Other assets
Derivative [Line Items]
Asset derivatives, fair value	1,139	20,895
Interest rate contract | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	1,139	20,895
Commercial loan hedge
Derivative [Line Items]
Notional amount	52,936	54,155
Commercial loan hedge | Other assets
Derivative [Line Items]
Asset derivatives, fair value	0	0
Commercial loan hedge | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	174	3,312
Long term borrowing hedge | Other assets
Derivative [Line Items]
Asset derivatives, fair value	0	0
Long term borrowing hedge | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	1,693	$ 31,347
Related Party Loan | Interest rate swap agreements
Derivative [Line Items]
Customer derivatives program	$ 33,645

Interest Receivable (Details)

Interest Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 41,643	$ 37,669
Interest receivable	$ 41,643	37,669
Average period rate for earning assets	9.80%
Loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 33,688	29,858
Mortgage-backed securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	6,049	5,670
Investment securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 1,906	$ 2,141

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 390,291	$ 386,819
Less accumulated depreciation and amortization	(126,597)	(104,868)
Premises and equipment, net	263,694	281,951
Future minimum payments due, current	5,956
Future minimum payments due, two years	5,107
Future minimum payments due, three years	4,923
Future minimum payments due, four years	4,276
Future minimum payments due, five years	3,750
Future minimum payments due, thereafter	17,005
Rental expense	5,500	5,300	$ 6,600
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	102,381	109,414
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	149,805	143,841
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	18,587	18,365
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 119,518	$ 115,199
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years	25 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years	7 years
Minimum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years	2 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years	40 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years	15 years
Maximum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years	10 years

Customer Accounts - Schedule o

Customer Accounts - Schedule of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deposit Liabilities [Line Items]
Checking accounts, 0.15% and under	$ 3,019,095	$ 2,721,721
Savings accounts, 0.10% and under	888,881	820,980
Money market accounts, 0.01% to 0.15%	2,453,182	2,462,891
Time deposit accounts
Less than 1.00%	2,204,756	3,268,272
1.00% to 1.99%	2,099,841	1,292,612
2.00% to 2.99%	169,253	34,376
Total time deposits	4,473,850	4,595,260
Customer accounts	10,835,008	10,600,852
Within 1 year	2,553,712	2,894,900
1 to 2 years	975,351	798,309
2 to 3 years	386,763	293,058
Over 3 years	558,024	608,993
Customer accounts greater than $250,000	$ 2,674,914	$ 2,250,622
Minimum
Deposit Liabilities [Line Items]
Money market rate	0.01%	0.01%
Maximum
Deposit Liabilities [Line Items]
Checking rate	0.15%	0.15%
Passbook and statement rate	0.10%	0.10%
Money market rate	0.15%	0.15%

Customer Accounts - Interest E

Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Banking and Thrift [Abstract]
Checking accounts	$ 2,721	$ 1,491	$ 1,036
Savings accounts	978	734	660
Money market accounts	3,592	3,285	3,631
Time deposit accounts	45,256	47,425	46,273
Interest expense on customer accounts, gross	52,547	52,935	51,600
Less early withdrawal penalties	(524)	(450)	(546)
Interest expense on customer accounts	$ 52,023	$ 52,485	$ 51,054
Weighted average interest rate at end of year	0.54%	0.50%	0.48%
Weighted daily average interest rate during the year	0.49%	0.50%	0.48%

FHLB Advances and Other Borro67

FHLB Advances and Other Borrowings - FHLB Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Banking and Thrift [Abstract]
Within 1 year	$ 1,395,000	$ 200,000
1 to 3 years	430,000	880,000
3 to 5 years	400,000	700,000
More than 5 years	0	300,000
FHLB advances	$ 2,225,000	$ 2,080,000

FHLB Advances and Other Borro68

FHLB Advances and Other Borrowings - Weighted Average Cost and Amount of Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Federal Home Loan Banks [Abstract]
Weighted average interest rate, net of cash flow hedges, at end of year	2.80%	3.15%	3.35%
Weighted daily average interest rate, net of cash flow hedges, during the year	3.00%	3.22%	3.57%
Daily average of FHLB advances during the year	$ 2,167,986	$ 1,992,434	$ 1,848,904
Maximum amount of FHLB advances at any month end	2,350,000	2,080,000	1,930,000
Interest expense during the year (excludes interest rate swap expense)	$ 64,968	$ 64,058	$ 64,331

FHLB Advances and Other Borro69

FHLB Advances and Other Borrowings - Additional Information (Details)	12 Months Ended
	Sep. 30, 2017
Federal Home Loan Bank of Des Moines
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, percent of assets	48.00%

Income Taxes - Net Deferred Tax

Income Taxes - Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deferred tax assets
Loan loss reserves	$ 50,411	$ 45,531
REO reserves	1,693	4,018
Valuation adjustment on available-for-sale securities and cash flow hedges	0	6,482
Non-accrual loan interest	2,262	2,812
FDIC assisted transactions	12,236	9,598
Federal and state tax credits	3,939	1,791
Deferred compensation	3,037	2,359
Stock based compensation	2,259	925
Other	1,274	625
Total deferred tax assets	77,111	74,141
Deferred tax liabilities
FHLB stock dividends	24,135	24,135
Valuation adjustment on available-for-sale securities and cash flow hedges	2,914	0
Loan origination fees and costs	13,643	14,826
Premises and equipment	35,950	34,936
Other	2,145	5,320
Total deferred tax liabilities	78,787	79,217
Net deferred tax asset (liability)	(1,676)	(5,076)
Current tax asset (liability)	(3,920)	21,123
Net tax asset (liability)	$ (5,596)	$ 16,047

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Statutory income tax rate	35.00%	35.00%	35.00%
State income tax	1.00%	1.00%	2.00%
Other differences	(4.00%)	(2.00%)	(1.00%)
Effective income tax rate	32.00%	34.00%	36.00%

Income Taxes - Components of In

Income Taxes - Components of Income Taxes (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Federal:
Current									$ 87,804	$ 57,173	$ 79,841
Deferred									(10,142)	21,961	3,244
Federal									77,662	79,134	83,085
State:
Current									4,991	3,600	6,636
Deferred									31	1,351	(518)
State									5,022	4,951	6,118
Total
Current									92,795	60,773	86,477
Deferred									(10,111)	23,312	2,726
Income taxes	$ 20,865	$ 21,239	$ 20,721	$ 19,859	$ 21,115	$ 22,154	$ 21,499	$ 19,317	$ 82,684	$ 84,085	$ 89,203

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Liability for uncertain tax positions	$ 104	$ 105
Returns open to examination, minimum (years)	3 years
Returns open to examination, maximum (years)	5 years
Returns open to examination, state impact of federal changes, maximum (years)	2 years

401(k) and Employee Stock Own74

401(k) and Employee Stock Ownership Plan (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Retirement Benefits [Abstract]
Employee contribution, percentage of annual salary	100.00%
Employee contribution, maximum allowable contribution	$ 54,000
Service period for eligibility (in years)	1 year
Number of hours of service required in 12 months for plan eligibility (in hours)	1000 hours
Employer matching contribution percent	100.00%
Percent of employees' gross pay	4.00%
Term for employees to become fully vested (in years)	6 years
Profit sharing contribution, percent	7.00%
Company contributions to plan	$ 6,433,000	$ 7,600,000	$ 8,700,000

Stock Award Plans - Additional

Stock Award Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be reserved (in shares)	5,000,000
Shares available for issuance (in shares)	3,113,050
Award vesting period (in years)	5 years
Contractual term of award (in years)	10 years
Options granted (in shares)	0	0	0
Unrecognized compensation cost for stock options, net of forfeitures	$ 0
Compensation cost for stock options	$ 0	$ 89,000	$ 232,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, nonvested (in shares)	466,681	490,363	521,302	515,845
Fair market value at date of grant at restricted stock	$ 8,661,599
Compensation cost for stock options	$ 3,658,539	$ 3,357,108	$ 3,271,564
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	7 years

Stock Award Plans - Option Acti

Stock Award Plans - Option Activity (Details) - Employee Stock Option - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at September 30, 2016 (in shares)	459,443
Exercised (in shares)	(311,168)
Forfeited (in shares)	(25,745)
Outstanding at September 30, 2017 (in shares)	122,530	459,443
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average exercise price at beginning of period (in dollars per share)	$ 21.47
Options exercised, weighted average exercise price (in dollars per share)	22.83
Options forfeited, weighted average exercise price (in dollars per share)	18.61
Options outstanding, weighted average exercise price at end of period (in dollars per share)	$ 18.64	$ 21.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable (in shares)	122,530
Options exercisable, weighted average exercise price (in dollars per share)	$ 18.64
Options outstanding, weighted average remaining contractual term (in years)	2 years	2 years
Options exercisable, weighted average remaining contractual term (in years)	2 years
Options outstanding, aggregate intrinsic value	$ 1,839	$ 2,392
Options exercisable, aggregate intrinsic value	$ 1,839

Stock Award Plans - Other Stock

Stock Award Plans - Other Stock Option Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost for stock options	$ 0	$ 89	$ 232
Weighted average grant date fair value per stock option (in dollars per share)	$ 3.06	$ 2.73	$ 2.96
Total intrinsic value of options exercised	$ 2,605	$ 1,651	$ 831
Grant date fair value of options exercised	1,328	1,422	368
Proceeds from exercise of common stock options and related tax benefit	$ 7,238	$ 9,283	$ 2,070

Stock Award Plans - Nonvested S

Stock Award Plans - Nonvested Stock Options (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Weighted Average Grant Date Fair Value
Unrecognized compensation cost for stock options, net of forfeitures	$ 0
Non-Vested Options
Options Outstanding
Outstanding at beginning of period (in shares)	0	69,287	145,795
Vested (in shares)	0	(62,227)	(61,018)
Forfeited (in shares)	0	(7,060)	(15,490)
Outstanding at end of period (in shares)	0	0	69,287
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 0	$ 3.85	$ 3.87
Vested (in dollars per share)	0	3.91	3.88
Forfeited (in dollars per share)	0	3.89	3.90
Outstanding at end of period (in dollars per share)	$ 0	$ 0	$ 3.85

Stock Award Plans - Nonvested R

Stock Award Plans - Nonvested Restricted Stock (Details) - Restricted Stock - $ / shares	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	490,363	521,302	515,845
Granted (in shares)	238,450	229,450	301,750
Vested (in shares)	(116,878)	(165,965)	(223,043)
Forfeited (in shares)	(145,254)	(94,424)	(73,250)
Outstanding at end of period (in shares)	466,681	490,363	521,302
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, weighted average grant date fair value, beginning of period (in dollars per share)	$ 16	$ 15.03	$ 14.10
Granted, weighted average grant date fair value (in dollars per share)	18.89	17.20	14.26
Vested, weighted average grant date fair value (in dollars per share)	20.95	15.96	13.24
Forfeited, weighted average grant date fair value (in dollars per share)	8.56	13.64	10.72
Outstanding, weighted average grant date fair value, end of period (in dollars per share)	$ 18.56	$ 16	$ 15.03

Stockholders' Equity - Regulato

Stockholders' Equity - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
The Company
Common Equity Tier 1 risk-based capital ratio:
Tier one common equity capital	$ 1,701,327	$ 1,690,380
Tier one common equity capital to risk weighted assets	16.67%	17.54%
Tier one common equity capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Tier 1 risk-based capital ratio:
Tier one risk based capital	$ 1,701,327	$ 1,690,380
Tier one risk based capital to risk weighted assets	16.67%	17.54%
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Total risk-based capital ratio:
Capital	$ 1,828,935	$ 1,807,740
Capital to risk weighted assets	17.92%	18.76%
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Tier 1 leverage ratio:
Tier one leverage capital	$ 1,701,327	$ 1,690,380
Tier one leverage capital to average assets	11.49%	11.60%
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
The Bank
Common Equity Tier 1 risk-based capital ratio:
Tier one common equity capital	$ 1,668,314	$ 1,668,828
Tier one common equity capital to risk weighted assets	16.35%	17.32%
Tier one common equity capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Tier one common equity capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier 1 risk-based capital ratio:
Tier one risk based capital	$ 1,668,314	$ 1,668,828
Tier one risk based capital to risk weighted assets	16.35%	17.32%
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
Total risk-based capital ratio:
Capital	$ 1,795,929	$ 1,786,188
Capital to risk weighted assets	17.60%	18.54%
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier 1 leverage ratio:
Tier one leverage capital	$ 1,668,314	$ 1,668,828
Tier one leverage capital to average assets	11.27%	11.45%
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Stock repurchased (in shares)	3,137,178	3,867,563
Additional shares authorized to be repurchased (in shares)	1,902,412
Warrants issued (in shares)	1,707,456
Warrant exercise price (in dollars per share)	$ 17.57
Warrants repurchased during period (in shares)	478,399
Value of warrants	$ 7,631,576
Warrants outstanding (in shares)	330,217	808,616
Weighted Average
Class of Stock [Line Items]
Weighted average cost of repurchased stock (in dollars per share)	$ 31.36	$ 22.72

Stockholders' Equity - Earnings

Stockholders' Equity - Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average number of shares outstanding (in shares)									88,905,457	91,399,038	95,644,639
Diluted weighted average number of shares outstanding, including dilutive stock options (in shares)									89,224,207	91,912,918	96,053,959
Net income	$ 46,104	$ 44,112	$ 42,070	$ 41,246	$ 44,224	$ 43,004	$ 41,723	$ 35,098	$ 173,532	$ 164,049	$ 160,316
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.49	$ 0.47	$ 0.46	$ 0.49	$ 0.47	$ 0.45	$ 0.38	$ 1.95	$ 1.79	$ 1.68
Diluted earnings per share (in dollars per share)	$ 0.52	$ 0.49	$ 0.47	$ 0.46	$ 0.49	$ 0.47	$ 0.45	$ 0.38	$ 1.94	$ 1.78	$ 1.67
Warrant
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average call options and warrants (in shares)									242,979	440,366	340,016
Equity Option
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average call options and warrants (in shares)									75,771	73,514	69,304

Financial Information - Washi83

Financial Information - Washington Federal, INC. - Statement of Financial Condition (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Assets
Other assets	$ 185,826	$ 199,271
Total assets	15,253,580	14,888,063
Liabilities
Total liabilities	13,247,892	12,912,332
Stockholders’ equity
Total stockholders’ equity	2,005,688	1,975,731	$ 1,955,679	$ 1,973,283
Total liabilities and stockholders’ equity	15,253,580	14,888,063
Parent Company
Assets
Cash	33,077	24,300
Other assets	0	15
Investment in subsidiary	1,972,675	1,954,179
Total assets	2,005,752	1,978,494
Liabilities
Other liabilities	64	2,763
Total liabilities	64	2,763
Stockholders’ equity
Total stockholders’ equity	2,005,688	1,975,731
Total liabilities and stockholders’ equity	$ 2,005,752	$ 1,978,494

Financial Information - Washi84

Financial Information - Washington Federal, INC. - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income
Total Income	$ 142,240	$ 137,716	$ 136,198	$ 132,764	$ 132,872	$ 133,735	$ 135,063	$ 135,124	$ 548,918	$ 536,793	$ 530,553
Expense
Income before income taxes	66,969	65,351	62,791	61,105	65,339	65,158	63,222	54,415	256,216	248,134	249,519
Income tax benefit (expense)	(20,865)	(21,239)	(20,721)	(19,859)	(21,115)	(22,154)	(21,499)	(19,317)	(82,684)	(84,085)	(89,203)
NET INCOME	$ 46,104	$ 44,112	$ 42,070	$ 41,246	$ 44,224	$ 43,004	$ 41,723	$ 35,098	173,532	164,049	160,316
Parent Company
Income
Dividends from subsidiary									171,500	148,000	175,000
Total Income									171,500	148,000	175,000
Expense
Miscellaneous									435	435	439
Total expense									435	435	439
Net income (loss) before equity in undistributed net income (loss) of subsidiary									171,065	147,565	174,561
Equity in undistributed net income of subsidiary									2,326	16,336	(14,402)
Income before income taxes									173,391	163,901	160,159
Income tax benefit (expense)									141	148	157
NET INCOME									$ 173,532	$ 164,049	$ 160,316

Financial Information - Washi85

Financial Information - Washington Federal, INC. - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities
Net income	$ 46,104	$ 44,112	$ 42,070	$ 41,246	$ 44,224	$ 43,004	$ 41,723	$ 35,098	$ 173,532	$ 164,049	$ 160,316
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									7,974	(14,204)	(29,220)
Net cash provided (used) by operating activities									179,700	221,721	142,871
Cash Flows From Financing Activities
Proceeds from exercise of common stock options and related tax benefit									7,238	9,283	2,070
Repurchase of warrants									0	(7,744)	0
Treasury stock purchased									(98,374)	(87,850)	(126,728)
Dividends paid on common stock									(74,519)	(49,926)	(51,111)
Net cash provided (used) by financing activities									227,538	75,662	(350,176)
Increase (decrease) in cash and cash equivalents									(137,298)	166,319	(497,794)
Cash and cash equivalents at beginning of year				450,368				284,049	450,368	284,049	781,843
Cash and cash equivalents at end of year	313,070				450,368				313,070	450,368	284,049
Parent Company
Cash Flows From Operating Activities
Net income									173,532	164,049	160,316
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income (loss) of subsidiaries									3,584	(12,677)	32,375
Decrease (increase) in other assets									15	(15)	0
Increase (decrease) in other liabilities									(2,699)	1,552	(13,189)
Net cash provided (used) by operating activities									174,432	152,909	179,502
Cash Flows From Financing Activities
Proceeds from exercise of common stock options and related tax benefit									7,238	9,283	2,070
Treasury stock purchased									(98,374)	(87,850)	(126,728)
Dividends paid on common stock									(74,519)	(49,926)	(51,111)
Net cash provided (used) by financing activities									(165,655)	(136,237)	(175,769)
Increase (decrease) in cash and cash equivalents									8,777	16,672	3,733
Cash and cash equivalents at beginning of year				$ 24,300				$ 7,628	24,300	7,628	3,895
Cash and cash equivalents at end of year	$ 33,077				$ 24,300				$ 33,077	$ 24,300	$ 7,628

Selected Quarterly Financial 86

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Total Income	$ 142,240	$ 137,716	$ 136,198	$ 132,764	$ 132,872	$ 133,735	$ 135,063	$ 135,124	$ 548,918	$ 536,793	$ 530,553
Interest expense	29,808	29,101	28,471	29,612	30,056	29,495	28,738	28,255	116,992	116,544	117,072
Net interest income	112,432	108,615	107,727	103,152	102,816	104,240	106,325	106,869	431,926	420,249	413,481
Provision (release) for loan losses	(500)	0	(1,600)	0	(3,100)	(1,650)	(1,500)	0	(2,100)	(6,250)	(11,162)
Other operating income (including REO gain (loss), net)	16,686	13,798	10,931	12,294	14,830	15,573	14,623	12,055
Other operating expense	62,649	57,062	57,467	54,341	55,407	56,305	59,226	64,509	231,519	235,447	224,851
Income before income taxes	66,969	65,351	62,791	61,105	65,339	65,158	63,222	54,415	256,216	248,134	249,519
Income tax expense	20,865	21,239	20,721	19,859	21,115	22,154	21,499	19,317	82,684	84,085	89,203
NET INCOME	$ 46,104	$ 44,112	$ 42,070	$ 41,246	$ 44,224	$ 43,004	$ 41,723	$ 35,098	$ 173,532	$ 164,049	$ 160,316
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.49	$ 0.47	$ 0.46	$ 0.49	$ 0.47	$ 0.45	$ 0.38	$ 1.95	$ 1.79	$ 1.68
Diluted earnings per share (in dollars per share)	0.52	0.49	0.47	0.46	0.49	0.47	0.45	0.38	1.94	1.78	1.67
Cash dividends per share (in dollars per share)	$ 0.15	$ 0.15	$ 0.40	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.13	$ 0.84	$ 0.55	$ 0.54