Capitol Federal Financial (CFFN) 10-K 29 Nov 17 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Nov. 22, 2017	Mar. 31, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	Capitol Federal Financial Inc
Trading Symbol	cffn
Entity Central Index Key	1,490,906
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		138,230,735
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,990

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
ASSETS:
Cash and cash equivalents (includes interest-earning deposits of $340,748 and $267,829)	$ 351,659	$ 281,764
Securities:
Available-for-sale (AFS), at estimated fair value (amortized cost of $410,541 and $517,791)	415,831	527,301
Held-to-maturity (HTM), at amortized cost (estimated fair value of $833,009 and $1,122,867)	827,738	1,100,874
Loans receivable, net (allowance for credit losses (ACL) of $8,398 and $8,540)	7,195,071	6,958,024
Federal Home Loan Bank Topeka (FHLB) stock, at cost	100,954	109,970
Premises and equipment, net	84,818	83,221
Other assets	216,845	206,093
TOTAL ASSETS	9,192,916	9,267,247
LIABILITIES:
Deposits	5,309,868	5,164,018
FHLB borrowings	2,173,808	2,372,389
Repurchase agreements	200,000	200,000
Advance payments by borrowers for taxes and insurance	63,749	62,643
Income taxes payable, net	530	310
Deferred income tax liabilities, net	24,458	25,374
Accounts payable and accrued expenses	52,190	49,549
Total liabilities	7,824,603	7,874,283
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 100,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $.01 par value; 1,400,000,000 shares authorized; 138,223,835 and 137,486,172 shares issued and outstanding as of September 30, 2017 and 2016, respectively	1,382	1,375
Additional paid-in capital	1,167,368	1,156,855
Unearned compensation, Employee Stock Ownership Plan (ESOP)	(37,995)	(39,647)
Retained earnings	234,640	268,466
Accumulated other comprehensive income (AOCI), net of tax	2,918	5,915
Total stockholders' equity	1,368,313	1,392,964
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,192,916	$ 9,267,247

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Statement of Financial Position [Abstract]
Interest-earning deposits	$ 340,748	$ 267,829
Available-for-sale securities, amortized cost	410,541	517,791
Held-to-maturity securities, estimated fair value	833,009	1,122,867
Loans receivable, allowance for credit losses	$ 8,398	$ 8,540
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,400,000,000	1,400,000,000
Common stock, shares issued	138,223,835	137,486,172
Common stock, shares outstanding	138,223,835	137,486,172

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
INTEREST AND DIVIDEND INCOME:
Loans receivable	$ 253,393	$ 243,311	$ 235,500
Mortgage-backed securities (MBS)	23,809	29,794	36,647
Cash and cash equivalents	19,389	9,831	5,477
FHLB stock	12,233	12,252	12,556
Investment securities	4,362	5,925	7,182
Total interest and dividend income	313,186	301,113	297,362
INTEREST EXPENSE:
FHLB borrowings	68,871	65,091	67,797
Deposits	42,968	37,859	33,119
Repurchase agreements	5,965	5,981	6,678
Total interest expense	117,804	108,931	107,594
NET INTEREST INCOME	195,382	192,182	189,768
PROVISION FOR CREDIT LOSSES	0	(750)	771
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	195,382	192,932	188,997
NON-INTEREST INCOME:
Retail fees and charges	15,053	14,835	14,897
Income from bank-owned life insurance (BOLI)	2,233	3,420	1,150
Other non-interest income	4,910	5,057	5,093
Total non-interest income	22,196	23,312	21,140
NON-INTEREST EXPENSE:
Salaries and employee benefits	43,437	42,378	43,309
Information technology and communications	11,282	10,540	10,360
Occupancy, net	10,814	10,576	9,944
Regulatory and outside services	5,821	5,645	5,347
Deposit and loan transaction costs	5,284	5,585	5,417
Advertising and promotional	4,673	4,609	4,547
Federal insurance premium	3,539	5,076	5,495
Office supplies and related expense	1,981	2,640	2,088
Low income housing partnerships	0	3,872	4,572
Other non-interest expense	2,827	3,384	3,290
Total non-interest expense	89,658	94,305	94,369
INCOME BEFORE INCOME TAX EXPENSE	127,920	121,939	115,768
INCOME TAX EXPENSE	43,783	38,445	37,675
NET INCOME	$ 84,137	$ 83,494	$ 78,093
Basic earnings per share (EPS)	$ 0.63	$ 0.63	$ 0.58
Diluted EPS	0.63	0.63	0.58
Dividends declared per share	$ 0.88	$ 0.84	$ 0.84

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	$ 84,137	$ 83,494	$ 78,093
Other comprehensive income (loss), net of tax:
Changes in unrealized gains (losses) on AFS securities, net of taxes of $1,595, $1,494, and $(843)	(2,625)	(2,459)	1,388
Changes in unrealized losses on cash flow hedges, net of taxes of $226, $0, and $0	(372)	0	0
Comprehensive income	$ 81,140	$ 81,035	$ 79,481

Consolidated Statements Of Com6

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Changes in net unrealized gains (losses) on AFS securities, deferred income taxes	$ 1,595	$ 1,494	$ (843)
Changes in net unrealized losses on cash flow hedges, deferred income taxes	$ 226	$ 0	$ 0

Consolidated Statements Of Stoc

Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation ESOP [Member]	Retained Earnings [Member]	AOCI [Member]
Balance at Sep. 30, 2014	$ 1,492,882	$ 1,410	$ 1,180,732	$ (42,951)	$ 346,705	$ 6,986
Net income	78,093				78,093
Other comprehensive income (loss), net of tax	1,388					1,388
ESOP activity, net	2,036		384	1,652
Restricted stock activity, net	85		85
Stock-based compensation	2,086		2,086
Repurchase of common stock	(46,449)	(39)	(32,513)		(13,897)
Stock options exercised	267		267
Cash dividends to stockholders	(114,162)				(114,162)
Balance at Sep. 30, 2015	1,416,226	1,371	1,151,041	(41,299)	296,739	8,374
Net income	83,494				83,494
Other comprehensive income (loss), net of tax	(2,459)					(2,459)
ESOP activity, net	2,174		522	1,652
Restricted stock activity, net	49	1	48
Stock-based compensation	1,121		1,121
Stock options exercised	4,126	3	4,123
Cash dividends to stockholders	(111,767)				(111,767)
Balance at Sep. 30, 2016	1,392,964	1,375	1,156,855	(39,647)	268,466	5,915
Net income	84,137				84,137
Other comprehensive income (loss), net of tax	(2,997)					(2,997)
ESOP activity, net	2,436		784	1,652
Restricted stock activity, net	57		57
Stock-based compensation	506		506
Stock options exercised	9,173	7	9,166
Cash dividends to stockholders	(117,963)				(117,963)
Balance at Sep. 30, 2017	$ 1,368,313	$ 1,382	$ 1,167,368	$ (37,995)	$ 234,640	$ 2,918

Consolidated Statements Of Sto8

Consolidated Statements Of Stockholders' Equity (Parenthetical) - $ / shares	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
Statement of Stockholders' Equity [Abstract]
Cash dividends to stockholders	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.085	$ 0.335	$ 0.085	$ 0.335	$ 0.88	$ 0.84	$ 0.84

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	$ 84,137	$ 83,494	$ 78,093
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(12,233)	(12,252)	(12,556)
Provision for credit losses	0	(750)	771
Proceeds from sales of loans receivable held-for-sale	6,816	0	0
Amortization and accretion of premiums and discounts on securities	4,479	5,342	5,649
Depreciation and amortization of premises and equipment	7,796	7,141	6,844
Amortization of deferred amounts related to FHLB advances, net	1,419	1,868	4,196
Common stock committed to be released for allocation - ESOP	2,436	2,174	2,036
Stock-based compensation	506	1,121	2,086
Provision for deferred income taxes	922	470	3,201
Changes in:
Other assets, net	(680)	1,807	3,878
Income taxes payable/receivable	590	1,381	(1,374)
Accounts payable and accrued expenses	(10,743)	(6,840)	(6,215)
Net cash provided by operating activities	85,445	84,956	86,609
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(37,425)	(99,927)	(149,937)
Purchase of HTM securities	0	(144,392)	(54,133)
Proceeds from calls, maturities and principal reductions of AFS securities	144,643	326,814	234,794
Proceeds from calls, maturities and principal reductions of HTM securities	268,689	309,328	330,054
Proceeds from the redemption of FHLB stock	386,900	382,450	265,929
Purchase of FHLB stock	(365,651)	(329,625)	(190,862)
Net increase in loans receivable	(246,882)	(336,056)	(398,307)
Purchase of premises and equipment	(9,128)	(14,854)	(12,022)
Proceeds from sale of other real estate owned (OREO)	5,138	4,973	5,987
Purchase of BOLI	0	0	(50,000)
Proceeds from BOLI death benefit	0	783	0
Net cash provided by (used in) investing activities	146,284	99,494	(18,497)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(117,963)	(111,767)	(114,162)
Net change in deposits	145,850	331,498	177,248
Proceeds from borrowings	2,700,100	8,000,100	7,575,100
Repayments on borrowings	(2,900,100)	(8,900,100)	(7,695,100)
Change in advance payments by borrowers for taxes and insurance	1,106	825	3,713
Payment of FHLB prepayment penalties	0	0	(3,352)
Repurchase of common stock	0	0	(50,034)
Stock options exercised	8,843	4,070	267
Excess tax benefits from stock options	330	56	0
Net cash used in financing activities	(161,834)	(675,318)	(106,320)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	69,895	(490,868)	(38,208)
CASH AND CASH EQUIVALENTS:
Beginning of year	281,764	772,632	810,840
End of year	351,659	281,764	772,632
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	37,875	36,483	35,849
Interest payments	$ 117,308	$ 106,182	$ 103,784

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 Description of Business - Capitol Federal Financial, Inc. (the "Company") provides a full range of retail banking services through its wholly-owned subsidiary, Capitol Federal Savings Bank (the "Bank"), a federal savings bank, which has 37 traditional and 10 in-store banking offices serving primarily the metropolitan areas of Topeka, Wichita, Lawrence, Manhattan, Emporia and Salina, Kansas and portions of the metropolitan area of greater Kansas City. The Bank emphasizes mortgage lending, primarily originating and purchasing one- to four-family loans, and providing personal retail financial services. The Bank is subject to competition from other financial institutions and other companies that provide financial services. Basis of Presentation - The consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, the Bank. The Bank has a wholly owned subsidiary, Capitol Funds, Inc. Capitol Funds, Inc. has a wholly-owned subsidiary, Capitol Federal Mortgage Reinsurance Company ("CFMRC"). All intercompany accounts and transactions have been eliminated in consolidation. These consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP"), and require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from these estimates and assumptions. The Bank has an expense sharing agreement with the Company that covers the reimbursement of certain expenses that are allocable to the Company. These expenses include compensation, rent for leased office space, and general overhead expenses. The Company, the Bank, Capitol Funds, Inc. and CFMRC have a tax allocation agreement. The Bank is the paying agent to the taxing authorities for the group for all periods presented. Each entity is liable for taxes as if separate tax returns were filed and reimburses the Bank for its pro rata share of the tax liability. If any entity has a tax benefit, the Bank reimburses the entity for its tax benefit. Cash and Cash Equivalents - Cash and cash equivalents include cash on hand and amounts due from banks. Regulations of the Board of Governors of the Federal Reserve System ("FRB") require federally chartered savings banks to maintain cash reserves against their transaction accounts. Required reserves must be maintained in the form of vault cash, an account at a Federal Reserve Bank, or a pass-through account as defined by the FRB. The amount of interest-earning deposits held at the Federal Reserve Bank of Kansas City ("FRB of Kansas City") as of September 30, 2017 and 2016 was $337.5 million and $264.4 million , respectively. The Bank is in compliance with the FRB requirements. For the years ended September 30, 2017 and 2016 , the average daily balance of required reserves at the FRB of Kansas City was $9.1 million and $8.8 million , respectively. Net Presentation of Cash Flows Related to Borrowings - During the current fiscal year, the Bank entered into certain FHLB advances with contractual maturities of 90 days or less. Cash flows related to these advances are reported on a net basis in the consolidated statements of cash flows. Securities - Securities include MBS and agency debentures issued primarily by United States Government-Sponsored Enterprises ("GSE"), including Federal National Mortgage Association, Federal Home Loan Mortgage Corporation and the Federal Home Loan Banks, United States Government agencies, including Government National Mortgage Association, and municipal bonds. Securities are classified as HTM, AFS, or trading based on management's intention for holding the securities on the date of purchase. Generally, classifications are made in response to liquidity needs, asset/liability management strategies, and the market interest rate environment at the time of purchase. Securities that management has the intent and ability to hold to maturity are classified as HTM and reported at amortized cost. Such securities are adjusted for the amortization of premiums and discounts which are recognized as adjustments to interest income over the life of the securities using the level-yield method. Securities that management may sell if necessary for liquidity or asset management purposes are classified as AFS and reported at fair value, with unrealized gains and losses reported as a component of AOCI within stockholders' equity, net of deferred income taxes. The amortization of premiums and discounts are recognized as adjustments to interest income over the life of the securities using the level-yield method. Gains or losses on the disposition of AFS securities are recognized using the specific identification method. The Company primarily uses prices obtained from third party pricing services to determine the fair value of securities. See additional discussion of fair value of AFS securities in "Note 13. Fair Value of Financial Instruments." Securities that are purchased and held principally for resale in the near future are classified as trading securities and are reported at fair value, with unrealized gains and losses included in non-interest income in the consolidated statements of income. During the fiscal years ended September 30, 2017 and 2016 , neither the Company nor the Bank maintained a trading securities portfolio. Management monitors securities in the investment portfolio for impairment on an ongoing basis and performs a formal review quarterly. The process involves monitoring market events and other items that could impact issuers. The evaluation includes, but is not limited to, such factors as: the nature of the investment, the length of time the security has had a fair value less than the amortized cost basis, the cause(s) and severity of the loss, expectation of an anticipated recovery period, recent events specific to the issuer or industry including the issuer's financial condition and current ability to make future payments in a timely manner, external credit ratings and recent downgrades in such ratings, management's intent to sell and whether it is more likely than not management would be required to sell prior to recovery for debt securities. Management determines whether other-than-temporary losses should be recognized for impaired securities by assessing all known facts and circumstances surrounding the securities. If management intends to sell an impaired security or if it is more likely than not that management will be required to sell an impaired security before recovery of its amortized cost basis, an other-than-temporary impairment has occurred and the difference between amortized cost and fair value will be recognized as a loss in earnings and the security will be written down to fair value. Loans Receivable - Loans receivable that management has the intent and ability to hold for the foreseeable future are carried at the amount of unpaid principal, net of ACL, undisbursed loan funds, unamortized premiums and discounts, and deferred loan origination fees and costs. Net loan origination fees and costs, and premiums and discounts are amortized as yield adjustments to interest income using the level-yield method. Interest on loans is credited to income as earned and accrued only if deemed collectible. Troubled debt restructurings ("TDRs") - For borrowers experiencing financial difficulties, the Bank may grant a concession to the borrower, resulting in a TDR. Such concessions generally involve extensions of loan maturity dates, the granting of periods during which the payment of only interest and escrow is required, reductions in interest rates, and loans that have been discharged under Chapter 7 bankruptcy proceedings where the borrower has not reaffirmed the debt. The Bank does not forgive principal or interest nor does it commit to lend additional funds, except for situations generally involving the capitalization of delinquent interest and/or escrow not to exceed the original loan balance, to these borrowers. Delinquent loans - A loan is considered delinquent when payment has not been received within 30 days of its contractual due date. The number of days delinquent is determined by the number of scheduled payments that remain unpaid, assuming a period of 30 days between each scheduled payment. Nonaccrual loans - The accrual of income on loans is discontinued when interest or principal payments are 90 days in arrears. We also report certain TDR loans as nonaccrual loans that are required to be reported as such pursuant to regulatory reporting requirements. Loans on which the accrual of income has been discontinued are designated as nonaccrual and outstanding interest previously credited beyond 90 days delinquent is reversed. A nonaccrual loan is returned to accrual status once the contractual payments have been made to bring the loan less than 90 days past due or, in the case of a TDR loan, the borrower has made the required consecutive loan payments. Impaired loans - A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due, including principal and interest, according to the original contractual terms of the loan agreement. Interest income on impaired loans is recognized in the period collected unless the ultimate collection of principal is considered doubtful. Loans reported as impaired loans include loans partially charged-off and TDRs. Allowance for Credit Losses - The ACL represents management's best estimate of the amount of inherent losses in the loan portfolio as of the balance sheet date. It involves a high degree of complexity and requires management to make difficult and subjective judgments and assumptions about highly uncertain matters. Management's methodology for assessing the appropriateness of the ACL consists of a formula analysis model, along with analyzing and considering several other relevant internal and external data elements. The use of different judgments and assumptions could cause reported results to differ significantly. Management maintains the ACL through provisions for credit losses that are either charged or credited to income. One- to four-family loans, including home equity loans, are individually evaluated for loss when the loan is generally 180 days delinquent and any losses are charged-off. Losses are based on new collateral values obtained through appraisals, less estimated costs to sell. Anticipated private mortgage insurance proceeds are taken into consideration when calculating the loss amount. An updated appraisal is requested, at a minimum, every 12 months thereafter if the loan is 180 days or more delinquent or in foreclosure. If the Bank holds the first and second mortgage, both loans are combined when evaluating whether there is a potential loss on the loan. For commercial real estate loans, losses are charged-off when the collection of such amounts is determined to be unlikely. When a non-real estate secured loan, which includes consumer loans - other, is 120 days delinquent, any identified losses are charged-off. Charge-offs for any loan type may also occur at any time if the Bank has knowledge of the existence of a potential loss. The primary risk characteristics inherent in the one- to four-family and consumer loan portfolios are a decline in economic conditions, elevated levels of unemployment or underemployment, and declines in residential real estate values. Any one or a combination of these events may adversely affect borrowers' ability to repay their loans, resulting in increased delinquencies, non-performing assets, loan losses, and future loan loss provisions. Although the commercial real estate loan portfolio is subject to the same risk of declines in economic conditions, the primary risk characteristics inherent in this portfolio include the ability of the borrower to sustain sufficient cash flows from leases and to control expenses to satisfy their contractual debt payments, and/or the ability to utilize personal and/or business resources to pay their contractual debt payments if the cash flows are not sufficient. Additionally, if the Bank were to repossess the secured collateral of a commercial real estate loan, the pool of potential buyers is typically limited more than that for a residential property. This increases the risk that the Bank could hold the property for an extended period of time and/or potentially be forced to sell at a discounted price, resulting in additional losses. Each quarter end, a formula analysis is prepared which segregates the loan portfolio into categories based on certain risk characteristics. The categories include the following: one- to four-family loans; commercial real estate loans; consumer home equity loans; and other consumer loans. Home equity loans with the same underlying collateral as a one- to four-family loan are combined with the one- to four-family loan in the formula analysis model to calculate a combined loan-to-value ("LTV") ratio. The one- to four-family loan portfolio and related home equity loans are segregated into additional categories based on the following risk characteristics: loan source (originated, correspondent purchased, or bulk purchased), interest payments (fixed-rate and adjustable-rate), LTV ratios, borrower's credit scores, and certain geographic locations. The categories were derived by management based on reviewing the historical performance of the one- to four-family loan portfolio and taking into consideration current economic conditions, such as trends in residential real estate values in certain areas of the U.S. and unemployment rates. Impaired loans are not included in the formula analysis as they are individually evaluated for loss. Historical loss factors are applied to each loan category in the formula analysis model. Each quarter end, management reviews historical losses over a look-back time period and utilizes the historical loss time periods believed to be the most appropriate considering the current economic conditions. The historical loss time period is then adjusted for a loss emergence time period, which represents the estimated time period from the date of a loss event to the date we recognize a charge-off/loss. Qualitative loss factors are utilized in the formula analysis model to reflect risks inherent in each loan category that are not captured by the historical loss factors. The qualitative loss factors for one- to four-family and consumer loan portfolios take into consideration such items as: unemployment rate trends, residential real estate value trends, credit score trends, delinquent loan trends, and industry and peer charge-off information. The qualitative loss factors for the commercial real estate loan portfolio take into consideration the composition of the portfolio along with industry and peer charge-off information and certain ACL ratios. As loans are classified or become delinquent, the qualitative loss factors increase for each respective loan category. The qualitative loss factors were derived by management based on a review of the historical performance of the respective loan portfolios and industry and peer information for those loan portfolios with no or limited historical loss experience, along with consideration of current economic conditions and the likely impact such conditions might have to the performance of the loan portfolio. Management utilizes the formula analysis model, along with analyzing and considering several other relevant internal and external data elements when evaluating the adequacy of the ACL. Such data elements include the trend and composition of delinquent loans and non-performing loans, trends in foreclosed property and short sale transactions and charge-off activity, the current status and trends of local and national employment levels, trends and current conditions in the housing markets, loan growth and concentrations, industry and peer charge-off and ACL information, and certain ACL ratios such as ACL to loans receivable, net and annualized historical losses. Since the Bank's loan portfolio is primarily concentrated in one- to four-family real estate, management monitors residential real estate market value trends in the Bank's local market areas and geographic sections of the U.S. by reference to various industry and market reports, economic releases and surveys, and management's general and specific knowledge of the real estate markets in which the Bank lends, in order to determine what impact, if any, such trends may have on the level of ACL. Reviewing these data elements assists management in evaluating the overall credit quality of the loan portfolio and the reasonableness of the ACL on an ongoing basis, and whether changes need to be made to the Bank's ACL methodology. Management seeks to apply the ACL methodology in a consistent manner; however, the methodology can be modified in response to changing conditions. Although management believes the ACL was at a level adequate to absorb inherent losses in the loan portfolio at September 30, 2017, the level of the ACL remains an estimate that is subject to significant judgment and short-term changes. Federal Home Loan Bank Stock - As a member of FHLB Topeka, the Bank is required to acquire and hold shares of FHLB stock. The Bank's holding requirement varies based on the Bank's activities, primarily the Bank's outstanding borrowings, with FHLB. FHLB stock is carried at cost and is considered a restricted asset because it cannot be pledged as collateral or bought or sold on the open market and it also has certain redemption restrictions. Management conducts a quarterly evaluation to determine if any FHLB stock impairment exists. The quarterly impairment evaluation focuses primarily on the capital adequacy and liquidity of FHLB, while also considering the impact that legislative and regulatory developments may have on FHLB. Stock and cash dividends received on FHLB stock are reflected as dividend income in the consolidated statements of income. Premises and Equipment - Land is carried at cost. Buildings, leasehold improvements, and furniture, fixtures and equipment are carried at cost less accumulated depreciation and leasehold amortization. Buildings, furniture, fixtures and equipment are depreciated over their estimated useful lives using the straight-line method. Buildings have an estimated useful life of 39 years. Structural components of the buildings generally have an estimated life of 15 years. Furniture, fixtures and equipment have an estimated useful life of three to seven years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the term of the respective leases, which is generally three to 15 years. The costs for major improvements and renovations are capitalized, while maintenance, repairs and minor improvements are charged to operating expenses as incurred. Gains and losses on dispositions are recorded as non-interest income or non-interest expense as incurred. Income Taxes - The Company utilizes the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recognized for the tax consequences of temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. Deferred income tax expense (benefit) represents the change in deferred income tax assets and liabilities excluding the tax effects of the change in net unrealized gain (loss) on AFS securities, interest rate swaps and changes in the market value of restricted stock between the grant date and vesting date. Income tax related penalties and interest are included in income tax expense in the consolidated statements of income. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Certain tax benefits attributable to stock options and restricted stock are credited to additional paid-in capital. To the extent that management considers it more likely than not that a deferred tax asset will not be recovered, a valuation allowance is recorded. All positive and negative evidence is reviewed in determining how much of a valuation allowance is recognized on a quarterly basis. Certain accounting literature prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of an uncertain tax position taken, or expected to be taken, in a tax return. Interest and penalties related to unrecognized tax benefits are recognized in income tax expense in the consolidated statements of income. Accrued interest and penalties related to unrecognized tax benefits are included within the related tax liabilities line in the consolidated balance sheet. Employee Stock Ownership Plan - The funds borrowed by the ESOP from the Company to purchase the Company's common stock are being repaid from dividends paid on unallocated ESOP shares and, if necessary, contributions by the Bank. The shares pledged as collateral are reported as a reduction of stockholders' equity at cost. As ESOP shares are committed to be released from collateral each quarter, the Company records compensation expense based on the average market price of the Company's stock during the quarter. Additionally, the shares become outstanding for EPS computations once they are committed to be released. The eligibility criteria for participation in the Company's ESOP is a minimum of one year of service, at least age 21 , and at least 1,000 hours of employment in each plan year. Stock-based Compensation - The Company has share-based plans under which stock options and restricted stock awards have been granted. Compensation expense is recognized over the service period of the share-based payment award. The Company utilizes a fair-value-based measurement method in accounting for the share-based payment transactions with employees, except for equity instruments held by the ESOP. The Company applies the modified prospective method in which compensation cost is recognized over the service period for all awards granted. Borrowed Funds - The Bank has entered into repurchase agreements, which are sales of securities under agreements to repurchase, with approved counterparties. These agreements are recorded as financing transactions, and thereby reported as liabilities on the consolidated balance sheet, as the Bank maintains effective control over the transferred securities and the securities continue to be carried in the Bank's securities portfolio. The Bank has obtained borrowings from FHLB in the form of advances and a line of credit. Total FHLB borrowings are secured by certain qualifying loans pursuant to a blanket collateral agreement with FHLB and certain securities, as necessary. Additionally, the Bank is authorized to borrow from the Federal Reserve Bank's "discount window." The Company uses interest rate swaps as part of its interest rate risk management strategy to hedge the variable cash outflows associated with certain borrowings. Interest rate swaps are carried at fair value in the Company's consolidated financial statements. For interest rate swaps that are designated and qualify as cash flow hedges, the effective portion of changes in the fair value of such agreements are recorded in AOCI and are subsequently reclassified into interest expense in the period that interest on the borrowings affects earnings. The ineffective portion of the change in fair value of the interest rate swap is recognized directly in earnings. Effectiveness is assessed using regression analysis. At the inception of a hedge, the Company documents certain items, including the relationship between the hedging instrument and the hedged item, the risk management objective and the nature of the risk being hedged, a description of how effectiveness will be measured and an evaluation of hedged transaction effectiveness. Segment Information - As a community-oriented financial institution, substantially all of the Bank's operations involve the delivery of loan and deposit products to customers. Management makes operating decisions and assesses performance based on an ongoing review of these community banking operations, which constitute the Company's only operating segment for financial reporting purposes. Low Income Housing Partnerships - As part of the Bank's community reinvestment initiatives, the Bank invests in affordable housing limited partnerships ("low income housing partnerships") that make equity investments in affordable housing properties. The Bank is a limited partner in each partnership in which it invests. A separate, unrelated third party is the general partner. The Bank receives affordable housing tax credits and other tax benefits for these investments. Previously, the Bank accounted for low income housing partnerships using the equity method of accounting as two of the Bank's officers were involved in the operational management of the low income housing partnership investment group. Effective September 30, 2016, those two Bank officers discontinued their involvement in the operational management of the investment group. The Bank started using the proportional method of accounting for its low income housing partnership investments on October 1, 2016. See "Note 6. Low Income Housing Partnerships" for additional information. Earnings Per Share - Basic EPS is computed by dividing income available to common stockholders by the weighted average number of shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options) were exercised or resulted in the issuance of common stock. These potentially dilutive shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. Shares issued and shares reacquired during any period are weighted for the portion of the period that they were outstanding. In computing both basic and diluted EPS, the weighted average number of common shares outstanding includes the ESOP shares previously allocated to participants and shares committed to be released for allocation to participants and restricted stock shares which have vested or have been allocated to participants. ESOP shares that have not been committed to be released are excluded from the computation of basic and diluted EPS. Unvested restricted stock awards contain nonforfeitable rights to dividends and are treated as participating securities in the computation of EPS pursuant to the two-class method. Comprehensive Income - Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on AFS securities and changes in the accumulated gains/losses on effective cash flow hedging instruments, net of taxes. Recent Accounting Pronouncements - In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers . The ASU, as amended, implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of the amended guidance is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, the amended guidance identifies specific steps an entity should apply in order to achieve this principle. The amended guidance requires entities to disclose both quantitative and qualitative information regarding contracts with customers. ASU 2014-09 will become effective for the Company on October 1, 2018. The majority of the Company's revenue is composed of interest income from loans and securities which are explicitly excluded from the amended ASU; therefore the amended ASU will likely not have a material impact to the Company's consolidated financial condition and results of operations, but it will likely result in expanded disclosures. The Company's evaluation of the amended ASU and its impact on components of non-interest income is ongoing. In January 2016, the FASB issued ASU 2016-01, Financial Instruments, Recognition and Measurement of Financial Assets and Liabilities . The ASU supersedes certain accounting guidance related to equity securities with readily determinable fair values and the related impairment assessment. An entity's equity investments that are accounted for under the equity method of accounting or result in consolidation of an investee are not included within the scope of this ASU. The ASU requires public business entities to utilize the exit price notation in determining fair value for financial instruments measured at amortized cost on the balance sheet. The ASU requires additional reporting in other comprehensive income for financial liabilities measured at fair value in accordance with the fair value option. The ASU also requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balances or in the notes to the financial statements. ASU 2016-01 will become effective for the Company on October 1, 2018. The Company is currently evaluating the impact that this ASU may have on the Company's consolidated financial condition, results of operations and disclosures. In February 2016, the FASB issued ASU 2016-02, Leases . The ASU amends lease accounting guidance by requiring that lessees recognize the assets and liabilities arising from leases on the balance sheet. Additionally, the ASU requires entities to disclose both quantitative and qualitative information regarding their leasing activities. ASU 2016-02 will become effective for the Company on October 1, 2019. The Company is currently in the process of accumulating lease data and developing an inventory of leases. 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. The Company is continuing to evaluate the impact this ASU may have on the Company's consolidated financial condition, results of operations and disclosures. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, along with simplifying the classification in the statement of cash flows. The ASU became effective for the Company on October 1, 2017. Upon adoption, the Company elected to account for forfeitures of stock-based compensation awards when they occur. The Company will recognize excess tax benefits and tax deficiencies in income tax expense on the consolidated statements of income and present them within operating activities on the consolidated statements of cash flows. This ASU did not have a material impact on the Company's consolidated financial condition or results of operations at the time of adoption. However, the impact of tax benefits and the timing of their recognition within income tax expense is unpredictable, as these benefits are recognized primarily as a result of stock options being exercised. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments . The ASU replaces the incurred loss impairment methodology in current GAAP, which requires credit losses to be recognized when it is probable that a loss has incurred, with a new impairment methodology. The new impairment methodology requires an entity to measure, at each reporting date, the expected credit losses of financial assets not measured at fair value, such as loans, HTM debt securities, and loan commitments, over their contractual lives. Under the new impairment methodology, expected credit losses wi

Earnings Per Share

Earnings Per Share	12 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Shares acquired by the ESOP are not considered in the basic average shares outstanding until the shares are committed for allocation or vested to an employee's individual account. Unvested shares awarded pursuant to the Company's restricted stock benefit plans are treated as participating securities in the computation of EPS pursuant to the two-class method as they contain nonforfeitable rights to dividends. The two-class method is an earnings allocation that determines EPS for each class of common stock and participating security. For the Year Ended September 30, 2017 2016 2015 (Dollars in thousands, except per share amounts) Net income $ 84,137 $ 83,494 $ 78,093 Income allocated to participating securities (44 ) (66 ) (116 ) Net income available to common stockholders $ 84,093 $ 83,428 $ 77,977 Average common shares outstanding 134,019,962 132,982,815 135,321,235 Average committed ESOP shares outstanding 62,458 62,400 62,458 Total basic average common shares outstanding 134,082,420 133,045,215 135,383,693 Effect of dilutive stock options 161,442 131,161 24,810 Total diluted average common shares outstanding 134,243,862 133,176,376 135,408,503 Net EPS: Basic $ 0.63 $ 0.63 $ 0.58 Diluted $ 0.63 $ 0.63 $ 0.58 Antidilutive stock options, excluded from the diluted average common shares outstanding calculation 200,800 886,417 1,248,744

Securities

Securities	12 Months Ended
	Sep. 30, 2017
Marketable Securities [Abstract]
Securities	SECURITIES The following tables reflect the amortized cost, estimated fair value, and gross unrealized gains and losses of AFS and HTM securities at the dates presented. The majority of the MBS and investment securities portfolios are composed of securities issued by GSEs. September 30, 2017 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 271,300 $ 16 $ 587 $ 270,729 MBS 135,644 5,923 51 141,516 Trust preferred securities 2,067 — 16 2,051 Municipal bonds 1,530 5 — 1,535 $ 410,541 $ 5,944 $ 654 $ 415,831 HTM: MBS $ 800,931 $ 10,460 $ 5,295 $ 806,096 Municipal bonds 26,807 119 13 26,913 $ 827,738 $ 10,579 $ 5,308 $ 833,009 September 30, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 346,226 $ 815 $ 3 $ 347,038 MBS 169,442 9,069 4 178,507 Trust preferred securities 2,123 — 367 1,756 $ 517,791 $ 9,884 $ 374 $ 527,301 HTM: MBS $ 1,067,571 $ 22,862 $ 1,219 $ 1,089,214 Municipal bonds 33,303 357 7 33,653 $ 1,100,874 $ 23,219 $ 1,226 $ 1,122,867 The following tables summarize the estimated fair value and gross unrealized losses of those securities on which an unrealized loss at the dates presented was reported and the continuous unrealized loss position for less than 12 months and equal to or greater than 12 months as of the dates presented. September 30, 2017 Less Than 12 Months Equal to or Greater Than 12 Months Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses (Dollars in thousands) AFS: GSE debentures $ 224,421 $ 539 $ 24,952 $ 48 MBS 9,648 46 673 5 Trust preferred securities — — 2,051 16 $ 234,069 $ 585 $ 27,676 $ 69 HTM: MBS $ 259,200 $ 1,582 $ 201,094 $ 3,713 Municipal bonds 5,638 8 1,460 5 $ 264,838 $ 1,590 $ 202,554 $ 3,718 September 30, 2016 Less Than 12 Months Equal to or Greater Than 12 Months Estimated Unrealize d Estimated Unrealized Fair V alue Losses Fair Value Losses (Dollars in thousands) AFS: GSE debentures $ 24,997 $ 3 $ — $ — MBS — — 654 4 Trust preferred securities — — 1,756 367 $ 24,997 $ 3 $ 2,410 $ 371 HTM: MBS $ 147,930 $ 538 $ 66,646 $ 681 Municipal bonds 4,771 6 391 1 $ 152,701 $ 544 $ 67,037 $ 682 The unrealized losses at September 30, 2017 and 2016 were primarily a result of an increase in market yields from the time the securities were purchased. In general, as market yields rise, the fair value of securities will decrease; as market yields fall, the fair value of securities will increase. Management generally views changes in fair value caused by changes in interest rates as temporary; therefore, these securities have not been classified as other-than-temporarily impaired. The impairment is also considered temporary because scheduled coupon payments have been made, it is anticipated that the entire principal balance will be collected as scheduled, and management neither intends to sell the securities, nor is it more likely than not that the Company will be required to sell the securities before the recovery of the remaining amortized cost amount, which could be at maturity. As a result of the analysis, management has concluded that no other-than-temporary impairments existed at September 30, 2017 or 2016 . See "Note 1. Summary of Significant Accounting Policies - Securities" for additional information regarding our impairment review and classification process for securities. The amortized cost and estimated fair value of debt securities as of September 30, 2017 , by contractual maturity, are shown below. Actual principal repayments may differ from contractual maturities due to prepayment or early call privileges by the issuer. In the case of MBS, borrowers on the underlying loans generally have the right to prepay their loans without prepayment penalty. For this reason, MBS are not included in the maturity categories. AFS HTM Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value (Dollars in thousands) One year or less $ 121,340 $ 121,253 $ 6,141 $ 6,156 One year through five years 151,490 151,011 20,448 20,534 Five years through ten years — — 218 223 Ten years and thereafter 2,067 2,051 — — 274,897 274,315 26,807 26,913 MBS 135,644 141,516 800,931 806,096 $ 410,541 $ 415,831 $ 827,738 $ 833,009 The following table presents the taxable and non-taxable components of interest income on investment securities for the periods presented. For the Year Ended September 30, 2017 2016 2015 (Dollars in thousands) Taxable $ 3,847 $ 5,255 $ 6,431 Non-taxable 515 670 751 $ 4,362 $ 5,925 $ 7,182 The following table summarizes the carrying value of securities pledged as collateral for the obligations indicated below as of the dates presented. September 30, 2017 2016 (Dollars in thousands) Public unit deposits $ 499,993 $ 419,282 Repurchase agreements 214,298 217,374 FRB of Kansas City 11,769 15,938 $ 726,060 $ 652,594 All dispositions of securities during fiscal years 2017 , 2016 , and 2015 were the result of principal repayments, calls, or maturities.

Loans Receivable And Allowance

Loans Receivable And Allowance For Credit Losses	12 Months Ended
	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable And Allowance For Credit Losses	LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES Loans receivable, net at September 30, 2017 and 2016 is summarized as follows: 2017 2016 (Dollars in thousands) Real estate loans: One- to four-family: Originated $ 3,959,232 $ 4,005,615 Correspondent purchased 2,445,311 2,206,072 Bulk purchased 351,705 416,653 Construction 30,647 39,430 Total 6,786,895 6,667,770 Commercial: Permanent 183,030 110,768 Construction 86,952 43,375 Total 269,982 154,143 Total real estate loans 7,056,877 6,821,913 Consumer loans: Home equity 122,066 123,345 Other 3,808 4,264 Total consumer loans 125,874 127,609 Total loans receivable 7,182,751 6,949,522 Less: ACL 8,398 8,540 Discounts/unearned loan fees 24,962 24,933 Premiums/deferred costs (45,680 ) (41,975 ) $ 7,195,071 $ 6,958,024 As of September 30, 2017 and 2016 , the Bank serviced loans for others aggregating approximately $101.2 million and $120.0 million , respectively. Such loans are not included in the accompanying consolidated balance sheets. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts, disbursing payments to investors and foreclosure processing. Loan servicing income includes servicing fees withheld from investors and certain charges collected from borrowers, such as late payment fees. The Bank held borrowers' escrow balances on loans serviced for others of $2.1 million and $2.4 million as of September 30, 2017 and 2016 , respectively. Lending Practices and Underwriting Standards - Originating and purchasing one- to four-family loans is the Bank's primary lending business, resulting in a loan concentration in residential first mortgage loans. The Bank purchases one- to four-family loans, on a loan-by-loan basis, from a select group of correspondent lenders. The Bank also originates consumer loans primarily secured by one- to four-family residential properties and originates and participates in commercial real estate loans. As a result of our one- to four-family lending activities, the Bank has a concentration of loans secured by real property located in Kansas and Missouri. One- to four-family loans - Full documentation to support an applicant's credit and income, and sufficient funds to cover all applicable fees and reserves at closing, are required on all loans. Generally, loans are currently underwritten according to the "ability to repay" and "qualified mortgage" standards, as issued by the Consumer Financial Protection Bureau. Properties securing one- to four-family loans are appraised by either staff appraisers or fee appraisers, both of which are independent of the loan origination function and approved by our Board of Directors. The underwriting standards for loans purchased from correspondent and nationwide lenders are generally similar to the Bank's internal underwriting standards. The underwriting of loans purchased from correspondent lenders on a loan-by-loan basis is performed by the Bank's underwriters. The Bank also originates construction-to-permanent loans secured by one- to four-family residential real estate. Construction loans are obtained by homeowners who will occupy the property when construction is complete. The Bank does not originate construction loans to builders for speculative purposes. Construction draw requests and the supporting documentation are reviewed and approved by designated personnel. The Bank also performs regular documented inspections of the construction project to ensure the funds are being used for the intended purpose and the project is being completed according to the plans and specifications provided. Commercial real estate loans - The Bank's commercial real estate loans are originated by the Bank or are in participation with a lead bank. When underwriting a commercial real estate loan, several factors are considered, such as the income producing potential of the property, cash equity provided by the borrower, the financial strength of the borrower, managerial expertise of the borrower or tenant, feasibility studies, lending experience with the borrower and the marketability of the property. For commercial real estate participation loans, the Bank performs the same underwriting procedures as if the loan was being originated by the Bank. At the time of origination, LTV ratios on commercial real estate loans generally do not exceed 80% of the appraised value of the property securing the loans and the minimum debt service coverage ratio is generally 1.25 . Appraisals on properties securing these loans are performed by independent state certified fee appraisers. Consumer loans - The Bank offers a variety of secured consumer loans, including home equity loans and lines of credit, home improvement loans, auto loans, and loans secured by savings deposits. The Bank also originates a very limited amount of unsecured loans. The Bank does not originate any consumer loans on an indirect basis, such as contracts purchased from retailers of goods or services which have extended credit to their customers. The majority of the consumer loan portfolio is comprised of home equity lines of credit for which the Bank also has the first mortgage or the home equity line of credit is in the first lien position. The underwriting standards for consumer loans include a determination of an applicant's payment history on other debts and an assessment of an applicant's ability to meet existing obligations and payments on the proposed loan. Although creditworthiness of an applicant is a primary consideration, the underwriting process also includes a comparison of the value of the security in relation to the proposed loan amount. Credit Quality Indicators - Based on the Bank's lending emphasis and underwriting standards, management has segmented the loan portfolio into three segments: (1) one- to four-family; (2) consumer; and (3) commercial real estate. The one- to four-family and consumer loan portfolios are further segmented into classes for purposes of providing disaggregated information about the credit quality of the loan portfolio. The classes are: one- to four-family - originated, one- to four-family - correspondent purchased, one- to four-family - bulk purchased, consumer - home equity, and consumer - other. The one- to four-family - correspondent purchased class was segregated from the one- to four-family originated class in the current fiscal year due to the size of the portfolio along with the loan product composition, geographic locations and inherent credit risks within the portfolio. The prior period information presented within this note has been conformed to the new loan class presentation. The Bank's primary credit quality indicators for the one- to four-family and consumer - home equity loan portfolios are delinquency status, asset classifications, LTV ratios, and borrower credit scores. The Bank's primary credit quality indicators for the commercial real estate and consumer - other loan portfolios are delinquency status and asset classifications. The following tables present the recorded investment, by class, in loans 30 to 89 days delinquent, loans 90 or more days delinquent or in foreclosure, total delinquent loans, current loans, and total recorded investment at the dates presented. The recorded investment in loans is defined as the unpaid principal balance of a loan, less charge-offs and inclusive of unearned loan fees and deferred costs. At September 30, 2017 and 2016 , all loans 90 or more days delinquent were on nonaccrual status. September 30, 2017 90 or More Days Total Total 30 to 89 Days Delinquent or Delinquent Current Recorded Delinquent in Foreclosure Loans Loans Investment (Dollars in thousands) One- to four-family - originated $ 13,216 $ 5,500 $ 18,716 $ 3,956,598 $ 3,975,314 One- to four-family - correspondent 1,855 92 1,947 2,477,916 2,479,863 One- to four-family - bulk purchased 3,233 3,399 6,632 346,807 353,439 Commercial real estate — — — 268,979 268,979 Consumer - home equity 467 406 873 121,193 122,066 Consumer - other 33 4 37 3,771 3,808 $ 18,804 $ 9,401 $ 28,205 $ 7,175,264 $ 7,203,469 September 30, 2016 90 or More Days Total Total 30 to 89 Days Delinquent or Delinquent Current Recorded Delinquent in Foreclosure Loans Loans Investment (Dollars in thousands) One- to four-family - originated $ 13,545 $ 8,153 $ 21,698 $ 4,007,012 $ 4,028,710 One- to four-family - correspondent 3,389 992 4,381 2,233,941 2,238,322 One- to four-family - bulk purchased 5,082 7,380 12,462 406,379 418,841 Commercial real estate — — — 153,082 153,082 Consumer - home equity 635 520 1,155 122,190 123,345 Consumer - other 62 9 71 4,193 4,264 $ 22,713 $ 17,054 $ 39,767 $ 6,926,797 $ 6,966,564 The recorded investment of mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process as of September 30, 2017 and 2016 was $4.3 million and $5.7 million , respectively, which is included in loans 90 or more days delinquent or in foreclosure in the table above. The carrying value of residential OREO held as a result of obtaining physical possession upon completion of a foreclosure or through completion of a deed in lieu of foreclosure was $1.4 million at September 30, 2017 and $2.5 million at September 30, 2016 . The following table presents the recorded investment, by class, in loans classified as nonaccrual at the dates presented. The decrease in nonaccrual loans at September 30, 2017 compared to the prior year was due mainly to a decrease in loans 90 or more days delinquent, along with a decrease in loans reported as nonaccrual pursuant to regulatory reporting requirements. September 30, 2017 2016 (Dollars in thousands) One- to four-family - originated $ 10,054 $ 17,086 One- to four-family - correspondent 1,804 3,788 One- to four-family - bulk purchased 4,264 7,411 Commercial real estate — — Consumer - home equity 519 848 Consumer - other 4 10 $ 16,645 $ 29,143 In accordance with the Bank's asset classification policy, management regularly reviews the problem loans in the Bank's portfolio to determine whether any loans require classification. Loan classifications are defined as follows: • Special mention - These loans are performing loans on which known information about the collateral pledged or the possible credit problems of the borrower(s) have caused management to have doubts as to the ability of the borrower(s) to comply with present loan repayment terms and which may result in the future inclusion of such loans in the non-performing loan categories. • Substandard - A loan is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard loans include those characterized by the distinct possibility the Bank will sustain some loss if the deficiencies are not corrected. • Doubtful - Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses present make collection or liquidation in full on the basis of currently existing facts and conditions and values highly questionable and improbable. • Loss - Loans classified as loss are considered uncollectible and of such little value that their continuance as assets on the books is not warranted. The following table sets forth the recorded investment in loans classified as special mention or substandard, by class, at the dates presented. Special mention and substandard loans are included in the ACL formula analysis model if the loans are not individually evaluated for loss. Loans classified as doubtful or loss are individually evaluated for loss. At the dates presented, there were no loans classified as doubtful, and all loans classified as loss were fully charged-off. September 30, 2017 2016 Special Mention Substandard Special Mention Substandard (Dollars in thousands) One- to four-family - originated $ 7,031 $ 30,059 $ 10,242 $ 27,818 One- to four-family - correspondent 261 3,800 2,496 5,168 One- to four-family - bulk purchased — 8,005 1,156 11,480 Commercial real estate — — — — Consumer - home equity 9 1,032 54 1,431 Consumer - other — 4 8 16 $ 7,301 $ 42,900 $ 13,956 $ 45,913 The following table shows the weighted average credit score and weighted average LTV for one- to four-family loans and consumer home equity loans at the dates presented. Borrower credit scores are intended to provide an indication as to the likelihood that a borrower will repay their debts. Credit scores are updated at least semiannually, with the last update in September 2017 , from a nationally recognized consumer rating agency. The LTV ratios provide an estimate of the extent to which the Bank may incur a loss on any given loan that may go into foreclosure. The consumer - home equity LTV does not take into account the first lien position, if applicable. The LTV ratios were based on the current loan balance and either the lesser of the purchase price or original appraisal, or the most recent Bank appraisal, if available. In most cases, the most recent appraisal was obtained at the time of origination. September 30, 2017 2016 Credit Score LTV Credit Score LTV One- to four-family - originated 767 63 % 766 63 % One- to four-family - correspondent 764 68 764 68 One- to four-family - bulk purchased 757 63 753 64 Consumer - home equity 755 19 755 20 765 64 764 64 TDRs - The following tables present the recorded investment prior to restructuring and immediately after restructuring in all loans restructured during the periods presented. These tables do not reflect the recorded investment at the end of the periods indicated. Any increase in the recorded investment at the time of the restructuring was generally due to the capitalization of delinquent interest and/or escrow balances. During the fourth quarter of fiscal year 2017, management refined its methodology for assessing whether a loan modification qualifies as a TDR which, though not being material, resulted in fewer loans being classified as TDRs. For the Year Ended September 30, 2017 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 112 $ 11,940 $ 12,402 One- to four-family - correspondent 12 2,443 2,459 One- to four-family - bulk purchased 3 1,031 1,048 Commercial real estate — — — Consumer - home equity 17 368 380 Consumer - other — — — 144 $ 15,782 $ 16,289 For the Year Ended September 30, 2016 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 122 $ 17,201 $ 17,557 One- to four-family - correspondent 12 2,592 2,619 One- to four-family - bulk purchased 3 596 594 Commercial real estate — — — Consumer - home equity 19 427 433 Consumer - other 1 8 8 157 $ 20,824 $ 21,211 For the Year Ended September 30, 2015 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 141 $ 17,265 $ 17,468 One- to four-family - correspondent 2 546 542 One- to four-family - bulk purchased 4 1,140 1,144 Commercial real estate — — — Consumer - home equity 22 479 485 Consumer - other 3 12 12 172 $ 19,442 $ 19,651 The following table provides information on TDRs that became delinquent during the periods presented within 12 months after being restructured. For the Years Ended September 30, 2017 September 30, 2016 September 30, 2015 Number of Recorded Number of Recorded Number of Recorded Contracts Investment Contracts Investment Contracts Investment (Dollars in thousands) One- to four-family - originated 46 $ 4,561 48 $ 5,330 49 $ 5,311 One- to four-family - correspondent 2 148 3 548 3 432 One- to four-family - bulk purchased 2 698 — — 4 890 Commercial real estate — — — — — — Consumer - home equity 16 440 6 174 4 33 Consumer - other — — — — 1 5 66 $ 5,847 57 $ 6,052 61 $ 6,671 Impaired loans - The following information pertains to impaired loans, by class, as of the dates presented. During the fourth quarter of fiscal year 2017, management refined its methodology for classifying loans as impaired. The change resulting from this refinement was immaterial. Impaired loans include loans partially charged-off and TDRs. All impaired loans are individually evaluated for loss and all losses are charged-off, resulting in no related ACL for these loans. September 30, 2017 September 30, 2016 Unpaid Unpaid Recorded Principal Related Recorded Principal Related Investment Balance ACL Investment Balance ACL (Dollars in thousands) With no related allowance recorded One- to four-family - originated $ 30,251 $ 30,953 $ — $ 22,982 $ 23,640 $ — One- to four-family - correspondent 3,800 3,771 — 2,963 2,950 — One- to four-family - bulk purchased 7,403 8,606 — 10,985 12,684 — Commercial real estate — — — — — — Consumer - home equity 775 997 — 1,014 1,230 — Consumer - other — 24 — 10 42 — 42,229 44,351 — 37,954 40,546 — With an allowance recorded One- to four-family - originated — — — 13,430 13,476 125 One- to four-family - correspondent — — — 2,662 2,664 4 One- to four-family - bulk purchased — — — 1,650 1,627 49 Commercial real estate — — — — — — Consumer - home equity — — — 548 548 38 Consumer - other — — — 6 6 1 — — — 18,296 18,321 217 Total One- to four-family - originated 30,251 30,953 — 36,412 37,116 125 One- to four-family - correspondent 3,800 3,771 — 5,625 5,614 4 One- to four-family - bulk purchased 7,403 8,606 — 12,635 14,311 49 Commercial real estate — — — — — — Consumer - home equity 775 997 — 1,562 1,778 38 Consumer - other — 24 — 16 48 1 $ 42,229 $ 44,351 $ — $ 56,250 $ 58,867 $ 217 For the Years Ended September 30, 2017 September 30, 2016 September 30, 2015 Average Interest Average Interest Average Interest Recorded Income Recorded Income Recorded Income Investment Recognized Investment Recognized Investment Recognized (Dollars in thousands) With no related allowance recorded One- to four-family - originated $ 24,122 $ 917 $ 12,063 $ 470 $ 11,744 $ 451 One- to four-family - correspondent 3,346 118 495 18 471 10 One- to four-family - bulk purchased 9,852 194 11,022 196 11,153 196 Commercial real estate — — — — — — Consumer - home equity 988 86 628 93 485 29 Consumer - other 7 — 13 1 12 — 38,315 1,315 24,221 778 23,865 686 With an allowance recorded One- to four-family - originated 11,469 434 24,199 983 25,465 1,026 One- to four-family - correspondent 2,018 65 2,669 50 1,759 53 One- to four-family - bulk purchased 1,160 20 2,219 27 2,960 40 Commercial real estate — — — — — — Consumer - home equity 457 36 895 64 795 34 Consumer - other 10 1 13 1 15 2 15,114 556 29,995 1,125 30,994 1,155 Total One- to four-family - originated 35,591 1,351 36,262 1,453 37,209 1,477 One- to four-family - correspondent 5,364 183 3,164 68 2,230 63 One- to four-family - bulk purchased 11,012 214 13,241 223 14,113 236 Commercial real estate — — — — — — Consumer - home equity 1,445 122 1,523 157 1,280 63 Consumer - other 17 1 26 2 27 2 $ 53,429 $ 1,871 $ 54,216 $ 1,903 $ 54,859 $ 1,841 Allowance for Credit Losses - The following is a summary of ACL activity, by loan portfolio segment, for the periods presented, and the ending balance of ACL based on the Company's impairment methodology. For the Year Ended September 30, 2017 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540 Charge-offs (72 ) — (216 ) (288 ) — (60 ) (348 ) Recoveries 4 — 165 169 — 37 206 Provision for credit losses (687 ) (180 ) (14 ) (881 ) 904 (23 ) — Ending balance $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 For the Year Ended September 30, 2016 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 4,865 $ 2,115 $ 1,434 $ 8,414 $ 742 $ 287 $ 9,443 Charge-offs (200 ) — (342 ) (542 ) — (88 ) (630 ) Recoveries 77 — 374 451 — 26 477 Provision for credit losses (814 ) (13 ) (401 ) (1,228 ) 466 12 (750 ) Ending balance $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540 For the Year Ended September 30, 2015 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 4,460 $ 1,803 $ 2,323 $ 8,586 $ 400 $ 241 $ 9,227 Charge-offs (424 ) (11 ) (228 ) (663 ) — (72 ) (735 ) Recoveries 56 — 58 114 — 66 180 Provision for credit losses 773 323 (719 ) 377 342 52 771 Ending balance $ 4,865 $ 2,115 $ 1,434 $ 8,414 $ 742 $ 287 $ 9,443 The following is a summary of the loan portfolio and related ACL balances, at the dates presented, by loan portfolio segment disaggregated by the Company's impairment method. There was no ACL for loans individually evaluated for impairment at either date as all losses were charged-off. September 30, 2017 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 3,945,063 $ 2,476,063 $ 346,035 $ 6,767,161 $ 268,979 $ 125,100 $ 7,161,240 Recorded investment in loans individually evaluated for impairment 30,251 3,800 7,404 41,455 — 774 42,229 $ 3,975,314 $ 2,479,863 $ 353,439 $ 6,808,616 $ 268,979 $ 125,874 $ 7,203,469 ACL for loans collectively evaluated for impairment $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 September 30, 2016 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 4,003,750 $ 2,233,347 $ 407,833 $ 6,644,930 $ 153,082 $ 126,504 $ 6,924,516 Recorded investment in loans individually evaluated for impairment 24,960 4,975 11,008 40,943 — 1,105 42,048 $ 4,028,710 $ 2,238,322 $ 418,841 $ 6,685,873 $ 153,082 $ 127,609 $ 6,966,564 ACL for loans collectively evaluated for impairment $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540

Premises And Equipment

Premises And Equipment	12 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment, Net [Abstract]
Premises And Equipment, Net	PREMISES AND EQUIPMENT A summary of the net carrying value of premises and equipment at September 30, 2017 and 2016 was as follows: 2017 2016 (Dollars in thousands) Land $ 11,670 $ 11,065 Building and improvements 96,401 91,700 Furniture, fixtures and equipment 43,410 42,590 151,481 145,355 Less accumulated depreciation 66,663 62,134 $ 84,818 $ 83,221 The Bank has entered into non-cancelable operating lease agreements with respect to banking premises and equipment. It is expected that many agreements will be renewed at expiration in the normal course of business. Rental expense was $1.1 million , $1.2 million , and $1.1 million for the years ended September 30, 2017 , 2016 , and 2015 , respectively. As of September 30, 2017 , future minimum rental commitments, rounded to the nearest thousand, required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year were as follows: 2018 $ 1,170 2019 1,057 2020 813 2021 703 2022 623 Thereafter 1,906 $ 6,272

Low Income Housing Partnerships

Low Income Housing Partnerships	12 Months Ended
	Sep. 30, 2017
Investments in Affordable Housing Projects [Abstract]
Low Income Housing Partnerships	LOW INCOME HOUSING PARTNERSHIPS The Bank's investment in low income housing partnerships, which is included in other assets in the consolidated balance sheets, was $66.1 million and $58.0 million at September 30, 2017 and 2016 , respectively. The Bank's obligations related to unfunded commitments, which are included in accounts payable and accrued expenses in the consolidated balance sheets, were $29.4 million and $27.2 million at September 30, 2017 and 2016 , respectively. The majority of the commitments at September 30, 2017 are projected to be funded through the end of calendar year 2020 . For fiscal year 2017 , the net income tax benefit associated with these investments, which consists of proportional amortization expense and affordable housing tax credits and other related tax benefits, was reported in income tax expense in the consolidated statements of income. The amount of proportional amortization expense recognized during fiscal year 2017 was $4.4 million and the amount of affordable housing tax credits and other related tax benefits was $6.9 million , resulting in a net income tax benefit of $2.5 million . For fiscal years 2016 and 2015 , the expenses were reported in the low income housing partnerships line of the consolidated statements of income, and the amount of affordable housing tax credits and other related tax benefits was $6.0 million and $5.3 million , respectively. There were no impairment losses during fiscal years 2017 , 2016 , or 2015 resulting from the forfeiture or ineligibility of tax credits or other circumstances.

Deposits and Borrowed Funds

Deposits and Borrowed Funds	12 Months Ended
	Sep. 30, 2017
Deposits and Borrowed Funds [Abstract]
Deposits and Borrowed Funds	DEPOSITS AND BORROWED FUNDS Deposits - Non-interest-bearing deposits totaled $243.7 million and $217.0 million as of September 30, 2017 and 2016 , respectively. Certificates of deposit with a minimum denomination of $250 thousand were $676.1 million and $576.4 million as of September 30, 2017 and 2016 , respectively. Deposits in excess of $250 thousand may not be fully insured by the Federal Deposit Insurance Corporation. FHLB Borrowings - FHLB borrowings at September 30, 2017 consisted of $2.17 billion in FHLB advances, of which $1.98 billion were fixed-rate advances and $200.0 million were variable-rate advances. FHLB borrowings at September 30, 2016 consisted of $2.37 billion in fixed-rate FHLB advances. There were no borrowings against the variable-rate FHLB line of credit at September 30, 2017 and 2016. The line of credit is set to expire on November 16, 2018 , at which time it is expected to be renewed automatically by FHLB for a one year period. FHLB advances at September 30, 2017 and 2016 were comprised of the following: 2017 2016 (Dollars in thousands) FHLB advances $ 2,175,000 $ 2,375,000 Deferred prepayment penalty (1,192 ) (2,611 ) $ 2,173,808 $ 2,372,389 Weighted average contractual interest rate on FHLB advances 1.96 % 2.17 % Weighted average effective interest rate on FHLB advances (1) 2.09 2.24 (1) The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the variable-rate FHLB advances. During fiscal years 2017 , 2016 and 2015 , the Bank utilized a leverage strategy (the "leverage strategy") to increase earnings. The leverage strategy involves borrowing up to $2.10 billion either on the Bank's FHLB line of credit or by entering into short-term FHLB advances, depending on the rates offered by FHLB, with all of the balance being paid down at each quarter end. The proceeds of the borrowings, net of the required FHLB stock holdings, are deposited at the FRB of Kansas City. Management can discontinue the use of the leverage strategy at any point in time. During fiscal year 2017, the Bank entered into interest rate swap agreements with a total notional amount of $200.0 million in order to hedge the variable cash flows associated with the $200.0 million of variable-rate FHLB advances. At September 30, 2017 , the interest rate swap agreements had an average remaining term to maturity of 5.9 years . The interest rate swaps were designated as cash flow hedges and involve the receipt of variable amounts from a counterparty in exchange for the Bank making fixed-rate payments over the life of the interest rate swap agreements. At September 30, 2017 , the total fair value of the interest rate swaps was $598 thousand and was reported in accounts payable and accrued expenses on the consolidated balance sheet. During fiscal year 2017 , $134 thousand was reclassified from AOCI to interest expense and no hedge ineffectiveness was recognized in the consolidated statements of income. During the next 12 months, the Company estimates that $1.1 million will be reclassified as an increase to interest expense. The Bank has minimum collateral posting thresholds with its derivative counterparty and posts collateral on a daily basis. The Bank posted cash collateral of $731 thousand at September 30, 2017 . During fiscal year 2015, the Bank prepaid $325.0 million of fixed-rate FHLB advances with a weighted average contractual interest rate of 2.61% and a weighted average remaining term to maturity of approximately four months . The prepaid FHLB advances were replaced with $325.0 million of fixed-rate FHLB advances with a weighted average contractual interest rate of 1.66% and a weighted average term of 53 months . The Bank paid $3.4 million in prepayment penalties to FHLB as a result of prepaying the FHLB advances. The present value of the cash flows under the terms of the new FHLB advances was not more than 10% different from the present value of the cash flow under the terms of the prepaid FHLB advances (including the prepayment penalties) and there were no embedded conversion options in the prepaid advances or in the new FHLB advances. The prepayment penalties effectively increased the weighted average interest rate on the new advances by 42 basis points at the time of the transactions. The deferred prepayment penalties are being recognized in interest expense over the lives of the new FHLB advances. FHLB borrowings are secured by certain qualifying loans pursuant to a blanket collateral agreement with FHLB and certain securities, when necessary. Per FHLB's lending guidelines, total FHLB borrowings cannot exceed 40% of a borrowing institution's regulatory total assets without the pre-approval of FHLB senior management. In July 2017, the president of FHLB approved an increase, through July 2018, in the Bank's borrowing limit to 55% of Bank Call Report total assets. At September 30, 2017 , the ratio of the par value of the Bank's FHLB borrowings to the Bank's Call Report total assets was 24% . During fiscal year 2017 , the Bank's FHLB borrowings to the Bank's Call Report total assets was in excess of 40% due to the leverage strategy. Repurchase Agreements - At September 30, 2017 and 2016 , the Company had repurchase agreements outstanding in the amount of $200.0 million , with a weighted average contractual rate of 2.94% . All of the Company's repurchase agreements at September 30, 2017 and 2016 were fixed-rate. See Note 3 for information regarding the amount of securities pledged as collateral in conjunction with repurchase agreements. Securities are delivered to the party with whom each transaction is executed and the party agrees to resell the same securities to the Bank at the maturity of the agreement. The Bank retains the right to substitute similar or like securities throughout the terms of the agreements. The repurchase agreements and collateral are subject to valuation at current market levels and the Bank may ask for the return of excess collateral or be required to post additional collateral due to changes in the market values of these items. The Bank may also be required to post additional collateral as a result of principal payments received on the securities pledged. Maturity of Borrowed Funds and Certificates of Deposit - The following table presents the scheduled maturity of FHLB advances, at par, repurchase agreements, and certificates of deposit as of September 30, 2017 : FHLB Repurchase Certificates Advances Agreements of Deposit Amount Amount Amount (Dollars in thousands) 2018 $ 475,000 $ 100,000 $ 1,116,415 2019 500,000 — 748,537 2020 350,000 100,000 591,966 2021 550,000 — 274,805 2022 200,000 — 177,308 Thereafter 100,000 — 1,390 $ 2,175,000 $ 200,000 $ 2,910,421

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income tax expense for the years ended September 30, 2017 , 2016 , and 2015 consisted of the following: 2017 2016 2015 (Dollars in thousands) Current: Federal $ 38,127 $ 33,298 $ 30,079 State 4,734 4,677 4,395 42,861 37,975 34,474 Deferred: Federal 712 286 2,869 State 210 184 332 922 470 3,201 $ 43,783 $ 38,445 $ 37,675 The Company's effective tax rates were 34.2% , 31.5% , and 32.5% for the years ended September 30, 2017 , 2016 , and 2015 , respectively. The increase in the effective tax rate for the year ended September 30, 2017 was due primarily to the accounting method change for low income housing partnership investments. See "Note 1. Summary of Significant Accounting Policies" for further discussion regarding the accounting method change and "Note 6. Low Income Housing Partnerships" for additional information regarding the income tax expense components of the low income housing partnership investments. The differences between such effective rates and the statutory Federal income tax rate computed on income before income tax expense resulted from the following: 2017 2016 2015 Amount % Amount % Amount % (Dollars in thousands) Federal income tax expense computed at statutory Federal rate $ 44,772 35.0 % $ 42,679 35.0 % $ 40,519 35.0 % Increases (decreases) in taxes resulting from: State taxes, net of Federal tax effect 3,452 2.7 3,308 2.7 3,257 2.8 Low income housing tax credits, presented net of proportional amortization in 2017 (2,468 ) (2.0 ) (4,815 ) (4.0 ) (4,316 ) (3.7 ) ESOP related expenses, net (1,052 ) (0.8 ) (1,127 ) (0.9 ) (1,222 ) (1.1 ) Other (921 ) (0.7 ) (1,600 ) (1.3 ) (563 ) (0.5 ) $ 43,783 34.2 % $ 38,445 31.5 % $ 37,675 32.5 % Deferred income tax expense represents the change in deferred income tax assets and liabilities excluding the tax effects of the change in net unrealized gain (loss) on AFS securities, interest rate swaps and changes in the market value of restricted stock between the grant date and vesting date. The sources of these differences and the tax effect of each as of September 30, 2017 , 2016 , and 2015 were as follows: 2017 2016 2015 (Dollars in thousands) Salaries, deferred compensation and employee benefits $ 437 $ (143 ) $ (12 ) Low income housing partnerships 285 (318 ) (763 ) ACL 185 480 (75 ) Premises and equipment 14 1,593 (129 ) FHLB stock dividends 4 (1,357 ) 4,083 Capitol Federal Foundation contribution — — 418 Other, net (3 ) 215 (321 ) $ 922 $ 470 $ 3,201 The components of the net deferred income tax liabilities as of September 30, 2017 and 2016 were as follows: 2017 2016 (Dollars in thousands) Deferred income tax assets: Salaries, deferred compensation and employee benefits $ 2,583 $ 3,020 Low income housing partnerships 1,478 1,763 ESOP compensation 1,724 1,566 ACL 711 896 Other 2,621 2,528 Gross deferred income tax assets 9,117 9,773 Valuation allowance (1,795 ) (1,804 ) Gross deferred income tax asset, net of valuation allowance 7,322 7,969 Deferred income tax liabilities: FHLB stock dividends 23,242 23,238 Premises and equipment 6,105 6,091 Unrealized gain on AFS securities 2,000 3,595 Other 433 419 Gross deferred income tax liabilities 31,780 33,343 Net deferred tax liabilities $ 24,458 $ 25,374 The Company assesses the available positive and negative evidence surrounding the recoverability of its deferred tax assets and applies its judgment in estimating the amount of valuation allowance necessary under the circumstances. At both September 30, 2017 and 2016 , the Company had a valuation allowance of $1.8 million related to the net operating losses generated by the Company's consolidated Kansas corporate income tax return. The companies included in the consolidated Kansas corporate income tax return are the holding company and Capitol Funds, Inc., as the Bank files a Kansas privilege tax return. Based on the nature of the operations of the holding company and Capitol Funds, Inc., management believes there will not be sufficient taxable income to fully utilize the deferred tax assets noted above; therefore, a valuation allowance has been recorded for the related amounts at September 30, 2017 and 2016 . Accounting Standard Codification ("ASC") 740 Income Taxes prescribes a process by which a tax position taken, or expected to be taken, on an income tax return is determined based upon the technical merits of the position, along with whether the tax position meets a more-likely-than-not-recognition threshold, to determine the amount, if any, of unrecognized tax benefits to recognize in the financial statements. Estimated penalties and interest related to unrecognized tax benefits are included in income tax expense in the consolidated statements of income. For the year ended September 30, 2017 and 2016 , the Company had no unrecognized tax benefits. For the year ended September 30, 2015 , the Company's unrecognized tax benefits, estimated penalties and interest, and related activities were insignificant. The Company files income tax returns in the U.S. federal jurisdiction and the state of Kansas, as well as other states where it has either established nexus under an economic nexus theory or has exceeded enumerated nexus thresholds based on the amount of interest income derived from sources within a given state. With few exceptions, the Company is no longer subject to U.S. federal and state examinations by tax authorities for fiscal years before 2014 .

Employee Stock Ownership Plan

Employee Stock Ownership Plan	12 Months Ended
	Sep. 30, 2017
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Employee Benefit Plans	EMPLOYEE STOCK OWNERSHIP PLAN The ESOP trust acquired 3,024,574 shares ( 6,846,728 shares post-corporate reorganization) of common stock in the Company's initial public offering and 4,726,000 shares of common stock in the Company's corporate reorganization in December of 2010. Both acquisitions of common stock were made with proceeds from loans from the Company, secured by shares of the Company's stock purchased in each offering. The Bank has agreed to make cash contributions to the ESOP trust on an annual basis sufficient to enable the ESOP trust to make the required annual loan payments to the Company on September 30 of each year. The loan for the shares acquired in the initial public offering matured on September 30, 2013 . The loan for the shares acquired in the corporate reorganization matures on September 30, 2040 . As annual loan payments are made on September 30, shares are released from collateral and allocated to qualified employees based on the proportion of their qualifying compensation to total qualifying compensation. On September 30, 2017 , 165,198 shares were released from collateral. On September 30, 2018, 165,198 shares will be released from collateral. As ESOP shares are committed to be released from collateral, the Company records compensation expense. Dividends on unallocated ESOP shares are applied to the debt service payments of the loan secured by the unallocated shares. Dividends on unallocated ESOP shares in excess of the debt service payment are recorded as compensation expense and distributed to participants or participants' ESOP accounts. Compensation expense related to the ESOP was $3.3 million for the year ended September 30, 2017 , $3.0 million for the year ended September 30, 2016 , and $3.0 million for the year ended September 30, 2015 . Of these amounts, $784 thousand , $522 thousand , and $384 thousand related to the difference between the market price of the Company's stock when the shares were acquired by the ESOP trust and the average market price of the Company's stock during the years ended September 30, 2017 , 2016 , and 2015 , respectively. The amount included in compensation expense for dividends on unallocated ESOP shares in excess of the debt service payments was $833 thousand , $813 thousand , and $952 thousand for the years ended September 30, 2017 , 2016 , and 2015 , respectively. Shares may be withdrawn from the ESOP trust due to retirement, termination, or death of the participant. Additionally, a participant may begin to diversify at least 25% of their ESOP shares at age 50 . The following is a summary of shares held in the ESOP trust as of September 30, 2017 and 2016 : 2017 2016 (Dollars in thousands) Allocated ESOP shares 4,369,840 4,392,371 Unreleased ESOP shares 3,799,554 3,964,752 Total ESOP shares 8,169,394 8,357,123 Fair value of unreleased ESOP shares $ 55,853 $ 55,784

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Sep. 30, 2017
Share-based Compensation [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION The Company has a Stock Option Plan, a Restricted Stock Plan, and an Equity Incentive Plan, all of which are considered share-based plans. The Stock Option Plan and Restricted Stock Plan expired in April 2015. No additional grants can be made from these two plans; however awards granted under these two plans remain outstanding until they are individually vested, forfeited or expire. The objectives of the Equity Incentive Plan are to provide additional compensation to certain officers, directors and key employees by facilitating their acquisition of stock interest in the Company and enable the Company to retain personnel of experience and ability in key positions of responsibility. Stock Option Plans – There are currently 508,719 stock options outstanding as a result of grants awarded from the Stock Option Plan. The Equity Incentive Plan had 5,907,500 stock options originally eligible to be granted and, as of September 30, 2017 , the Company had 4,184,316 stock options still available for future grants under this plan. This plan will expire in January 2027 and no additional grants may be made after expiration, but awards granted under this plan remain outstanding until they are individually vested, forfeited, or expire. The Company may issue incentive and nonqualified stock options under the Equity Incentive Plan. The Company may also award stock appreciation rights, although no stock appreciation rights have been awarded to date. The incentive stock options expire no later than 10 years from the date of grant, and the nonqualified stock options expire no later than 15 years from the date of grant. The vesting period of the stock options under the Equity Incentive Plan generally has ranged from three to five years. The stock option price cannot be less than the market value at the date of the grant as defined by each plan. The fair value of stock option grants is estimated on the date of the grant using the Black-Scholes option pricing model. At September 30, 2017 , the Company had 1,236,798 stock options outstanding with a weighted average exercise price of $13.31 per option and a weighted average contractual life of 5.3 years , and 1,144,798 options exercisable with a weighted average exercise price of $13.38 per option and a weighted average contractual life of 5.1 years . The exercise price may be paid in cash, shares of common stock, or a combination of both. New shares are issued by the Company upon the exercise of stock options. Compensation expense attributable to stock option awards during the years ended September 30, 2017 , 2016 , and 2015 totaled $118 thousand , $335 thousand , and $618 thousand , respectively. The fair value of stock options vested during the years ended September 30, 2017 , 2016 , and 2015 was $174 thousand , $652 thousand , and $615 thousand , respectively. As of September 30, 2017 , the total future compensation cost related to non-vested stock options not yet recognized in the consolidated statements of income was $128 thousand , net of estimated forfeitures, and the weighted average period over which these awards are expected to be recognized was 2.0 years . Restricted Stock Plans – The Equity Incentive Plan had 2,363,000 shares originally eligible to be granted as restricted stock and, as of September 30, 2017 , the Company had 1,757,650 shares available for future grants of restricted stock under this plan. This plan will expire in January 2027 and no additional grants may be made after expiration, but awards granted under this plan remain outstanding until they are individually vested or forfeited. The vesting period of the restricted stock awards under the Equity Incentive Plan has generally ranged from three to five years. At September 30, 2017 , the Company had 56,600 unvested restricted stock shares with a weighted average grant date fair value of $13.38 per share. Compensation expense is calculated based on the fair market value of the common stock at the date of the grant, as defined by the plan, and is recognized over the vesting time period. Compensation expense attributable to restricted stock awards during the years ended September 30, 2017 , 2016 , and 2015 totaled $388 thousand , $787 thousand , and $1.5 million , respectively. The fair value of restricted stock that vested during the years ended September 30, 2017 , 2016 , and 2015 totaled $563 thousand , $1.6 million , and $1.5 million , respectively. As of September 30, 2017 there was $635 thousand of unrecognized compensation cost related to unvested restricted stock to be recognized over a weighted average period of 2.7 years .

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES The following table summarizes the Bank's loan commitments as of September 30, 2017 and 2016 : 2017 2016 (Dollars in thousands) Originate fixed-rate $ 33,528 $ 68,047 Originate adjustable-rate 9,861 12,257 Purchase/participate fixed-rate 74,104 138,792 Purchase/participate adjustable-rate 52,453 18,653 $ 169,946 $ 237,749 Commitments to originate loans are commitments to lend to a customer. Commitments to purchase/participate in loans represent commitments to purchase loans from correspondent lenders on a loan-by-loan basis or participate in commercial real estate loans with a lead bank. The Bank evaluates each borrower's creditworthiness on a case-by-case basis. Commitments generally have expiration dates or other termination clauses and one-to four-family loan commitments may require the payment of a rate lock fee. Some of the commitments are expected to expire without being fully drawn upon; therefore, the amount of total commitments disclosed in the table above does not necessarily represent future cash requirements. As of September 30, 2017 and 2016 , there were no significant loan-related commitments that met the definition of derivatives or commitments to sell mortgage loans. As of September 30, 2017 and 2016 , the Bank had approved but unadvanced home equity lines of credit of $240.0 million and $262.8 million , respectively. In the normal course of business, the Company and its subsidiary are named defendants in various lawsuits and counterclaims. In the opinion of management, after consultation with legal counsel, none of the currently pending suits are expected to have a materially adverse effect on the Company's consolidated financial statements for the year ended September 30, 2017 , or future periods.

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Sep. 30, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements	REGULATORY CAPITAL REQUIREMENTS The Bank and the Company are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and, possibly additional discretionary, actions by regulators that, if undertaken, could have a material adverse effect on the Company's financial statements. Under regulatory capital adequacy guidelines, the Company and Bank must meet specific capital guidelines that involve quantitative measures of the Company's and Bank's assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. Additionally, the Bank must meet specific capital guidelines to be considered well capitalized per the regulatory framework for prompt corrective action. The Company's and Bank's capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings, and other factors. Generally, savings institutions, such as the Bank, may make capital distributions during any calendar year equal to the earnings of the previous two calendar years and current year-to-date earnings. It is generally required that the Bank remain well capitalized before and after the proposed distribution. The Company's ability to pay dividends is dependent, in part, upon its ability to obtain capital distributions from the Bank. So long as the Bank continues to remain well capitalized after each capital distribution and operates in a safe and sound manner, it is management's belief that the regulators will continue to allow the Bank to distribute its net income to the Company, although no assurance can be given in this regard. In conjunction with the Company's corporate reorganization in December 2010, a "liquidation account" was established for the benefit of certain depositors of the Bank in an amount equal to Capitol Federal Savings Bank MHC's ownership interest in the retained earnings of Capitol Federal Financial as of June 30, 2010. As of September 30, 2017 , the balance of this liquidation account was $167.2 million . Under applicable federal banking regulations, neither the Company nor the Bank is permitted to pay dividends on its capital stock to its stockholders if stockholders' equity would be reduced below the amount of the liquidation account at that time. The Bank and the Company must maintain certain minimum capital ratios as set forth in the table below for capital adequacy purposes. Effective January 1, 2016, the Company and Bank were required to maintain a capital conservation buffer above certain minimum capital ratios for capital adequacy purposes in order to avoid certain restrictions on capital distributions and other payments including dividends, share repurchases, and certain compensation. The required capital conservation buffer is being phased in over a four year period by increasing the required buffer amount by 0.625% each year. The capital conservation buffer was 0.625% at September 30, 2016 and 1.25% at September 30, 2017 . At September 30, 2017 and 2016 , the Bank and Company exceeded the capital conservation buffer requirement. Once fully phased-in, which will be on January 1, 2019 for the Company and Bank, the organization must maintain a balance of capital that exceeds by more than 2.5% each of the minimum risk-based capital ratios in order to satisfy the requirement. Management believes, as of September 30, 2017 , that the Bank and Company meet all capital adequacy requirements to which they are subject and there were no conditions or events subsequent to September 30, 2017 that would change the Bank's or Company's category. To Be Well Capitalized Under Prompt For Capital Corrective Action Actual Adequacy Purposes Provisions Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bank As of September 30, 2017 Tier 1 leverage ratio $ 1,201,863 10.8 % $ 444,877 4.0 % $ 556,097 5.0 % Common Equity Tier 1 ("CET1") capital ratio 1,201,863 27.2 199,181 4.5 287,706 6.5 Tier 1 capital ratio 1,201,863 27.2 265,575 6.0 354,100 8.0 Total capital ratio 1,210,261 27.3 354,100 8.0 442,625 10.0 As of September 30, 2016 Tier 1 leverage ratio 1,234,912 10.9 452,339 4.0 565,424 5.0 CET1 capital ratio 1,234,912 28.5 195,080 4.5 281,783 6.5 Tier 1 capital ratio 1,234,912 28.5 260,107 6.0 346,809 8.0 Total capital ratio 1,243,452 28.7 346,809 8.0 433,512 10.0 Company As of September 30, 2017 Tier 1 leverage ratio 1,365,395 12.3 444,785 4.0 N/A N/A CET1 capital ratio 1,365,395 30.8 199,195 4.5 N/A N/A Tier 1 capital ratio 1,365,395 30.8 265,594 6.0 N/A N/A Total capital ratio 1,373,793 31.0 354,125 8.0 N/A N/A As of September 30, 2016 Tier 1 leverage ratio 1,387,049 12.3 452,248 4.0 N/A N/A CET1 capital ratio 1,387,049 32.0 195,094 4.5 N/A N/A Tier 1 capital ratio 1,387,049 32.0 260,126 6.0 N/A N/A Total capital ratio 1,395,589 32.2 346,835 8.0 N/A N/A

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Measurements – The Company uses fair value measurements to record fair value adjustments to certain financial instruments and to determine fair value disclosures in accordance with ASC 820 and ASC 825. The Company's AFS securities and interest rate swaps are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other financial instruments on a non-recurring basis, such as OREO and loans individually evaluated for impairment. These non-recurring fair value adjustments involve the application of lower of cost or fair value accounting or write-downs of individual financial instruments. The Company groups its financial instruments at fair value in three levels based on the markets in which the financial instruments are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1 - Valuation is based upon quoted prices for identical instruments traded in active markets. • Level 2 - Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 - Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect the Company's own estimates of assumptions that market participants would use in pricing the financial instrument. Valuation techniques include the use of option pricing models, discounted cash flow models, and similar techniques. The results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the financial instrument. The Company bases its fair values on the price that would be received from the sale of a financial instrument in an orderly transaction between market participants at the measurement date under current market conditions. The Company maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. The following is a description of valuation methodologies used for financial instruments measured at fair value on a recurring basis. AFS Securities - The Company's AFS securities portfolio is carried at estimated fair value, with any unrealized gains and losses, net of taxes, reported as AOCI in stockholders' equity. The majority of the securities within the AFS portfolio were issued by GSEs. The Company primarily uses prices obtained from third party pricing services to determine the fair value of its securities. On a quarterly basis, management corroborates a sample of prices obtained from the third party pricing service for Level 2 securities by comparing them to an independent source. If the price provided by the independent source varies by more than a predetermined percentage from the price received from the third party pricing service, then the variance is researched by management. The Company did not have to adjust prices obtained from the third party pricing service when determining the fair value of its securities during the years ended September 30, 2017 and 2016 . The Company's major security types, based on the nature and risks of the securities, are: • GSE Debentures - Estimated fair values are based on a discounted cash flow method. Cash flows are determined by taking any embedded options into consideration and are discounted using current market yields for similar securities. (Level 2) • MBS - Estimated fair values are based on a discounted cash flow method. Cash flows are determined based on prepayment projections of the underlying mortgages and are discounted using current market yields for benchmark securities. (Level 2) • Municipal Bonds - Estimated fair values are based on a discounted cash flow method. Cash flows are determined by taking any embedded options into consideration and are discounted using current market yields for securities with similar credit profiles. (Level 2) • Trust Preferred Securities - Estimated fair values are based on a discounted cash flow method. Cash flows are determined by taking prepayment and underlying credit considerations into account. The discount rates are derived from secondary trades and bid/offer prices. (Level 3) Interest Rate Swaps - The Company's interest rate swaps are designated as cash flow hedges and are reported at fair value in accounts payable and accrued expenses on the consolidated balance sheet, with any unrealized gains and losses, net of taxes, reported as AOCI in stockholders' equity. See "Note 7. Deposits and Borrowed Funds" for additional information. The estimated fair value of the interest rates swaps are obtained from a third party and are determined using a discounted cash flow analysis using observable market-based inputs. On a quarterly basis, management corroborates the estimated fair values obtained from the third party by internally calculating the estimated fair value using a discounted cash flow analysis using independent observable market-based inputs. The Company did not make any adjustments to the estimated fair value received from the third party during the year ended September 30, 2017. (Level 2) The following tables provide the level of valuation assumption used to determine the carrying value of the Company's financial instruments measured at fair value on a recurring basis at the dates presented. The Company did not have any liabilities that were measured at fair value at September 30, 2016. September 30, 2017 Quoted Prices Significant Significant in Active Markets Other Observable Unobservable Carrying for Identical Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets: AFS Securities: GSE debentures $ 270,729 $ — $ 270,729 $ — MBS 141,516 — 141,516 — Municipal bonds 1,535 — 1,535 — Trust preferred securities 2,051 — — 2,051 $ 415,831 $ — $ 413,780 $ 2,051 Liabilities: Interest Rate Swaps $ 598 $ — $ 598 $ — September 30, 2016 Quoted Prices Significant Significant in Active Markets Other Observable Unobservable Carrying for Identical Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets: AFS Securities: GSE debentures $ 347,038 $ — $ 347,038 $ — MBS 178,507 — 178,507 — Trust preferred securities 1,756 — — 1,756 $ 527,301 $ — $ 525,545 $ 1,756 The Company's Level 3 AFS securities had no activity during fiscal years 2017 , 2016 , and 2015 except for principal repayments of $88 thousand , $97 thousand , and $400 thousand , respectively, and (decreases)/increases in net unrealized losses included in other comprehensive income of $(218) thousand , $61 thousand , and $45 thousand , respectively. The following is a description of valuation methodologies used for significant financial instruments measured at fair value on a non-recurring basis. Loans Receivable – The balance of loans individually evaluated for impairment at September 30, 2017 and 2016 was $18.4 million and $42.0 million , respectively. All of these loans were secured by residential real estate and were individually evaluated to determine if the carrying value of the loan was in excess of the fair value of the collateral, less estimated selling costs of 10% . Fair values were estimated through current appraisals or current Federal Housing Finance Agency ("FHFA") housing price indices, which is a broad based measure of the movement of single-family house prices and is a weighted, repeat-sales index. Management does not adjust or apply a discount to the appraised value or FHFA housing price indices, except for the estimated sales cost noted above. The primary significant unobservable input for loans individually evaluated for impairment using appraisals to determine the estimated fair value was the appraisal. Fair values of loans individually evaluated for impairment cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the loan, and, as such are classified as Level 3. Based on this evaluation, the Bank charged-off all loss amounts as of September 30, 2017 and 2016 ; therefore, the fair value was equal to the carrying value and there was no ACL related to these loans. OREO – OREO primarily represents real estate acquired as a result of foreclosure or by deed in lieu of foreclosure and is carried at lower of cost or fair value. Fair value is estimated through current appraisals or listing prices, less estimated selling costs of 10% . Management does not adjust or apply a discount to the appraised value or listing price, except for the estimated sales costs noted above. The primary significant unobservable input for OREO was the appraisal or listing price. Fair values of foreclosed property cannot be determined with precision and may not be realized in an actual sale of the property, and, as such are classified as Level 3. The fair value of OREO was equal to the carrying value at September 30, 2017 and 2016 and was $1.4 million and $3.7 million , respectively. Fair Value Disclosures – The Company determined estimated fair value amounts using available market information and a variety of valuation methodologies as of the dates presented. Considerable judgment is required to interpret market data to develop the estimates of fair value. The estimates presented are not necessarily indicative of amounts the Company would realize from a current market exchange at subsequent dates. The carrying amounts and estimated fair values of the Company's financial instruments, at the dates presented, were as follows: 2017 2016 Estimated Estimated Carrying Fair Carrying Fair Amount Value Amount Value (Dollars in thousands) Assets: Cash and cash equivalents $ 351,659 $ 351,659 $ 281,764 $ 281,764 AFS securities 415,831 415,831 527,301 527,301 HTM securities 827,738 833,009 1,100,874 1,122,867 Loans receivable 7,195,071 7,354,100 6,958,024 7,292,971 FHLB stock 100,954 100,954 109,970 109,970 Liabilities: Deposits 5,309,868 5,318,249 5,164,018 5,204,251 FHLB borrowings 2,173,808 2,182,841 2,372,389 2,434,151 Repurchase agreements 200,000 202,004 200,000 207,303 Interest rate swaps 598 598 — — The following methods and assumptions were used to estimate the fair value of the financial instruments: Cash and cash equivalents - The carrying amounts of cash and cash equivalents are considered to approximate their fair value due to the nature of the financial assets. (Level 1) HTM securities - Estimated fair values of securities are based on one of three methods: (1) quoted market prices where available; (2) quoted market prices for similar instruments if quoted market prices are not available; (3) unobservable data that represents the Bank's assumptions about items that market participants would consider in determining fair value where no market data is available. HTM securities are carried at amortized cost. (Level 2) Loans receivable - The fair value of one- to four-family loans and home equity loans are generally estimated using the present value of expected future cash flows, assuming future prepayments and using discount factors determined by prices obtained from securitization markets, less a discount for the cost of servicing and lack of liquidity. The estimated fair value of the Bank's commercial and consumer loans are based on the expected future cash flows assuming future prepayments and discount factors based on current offering rates. (Level 3) FHLB stock - The carrying value and estimated fair value of FHLB stock equals cost, which is based on redemption at par value. (Level 1) Deposits - The estimated fair value of demand deposits, savings, and money market accounts is the amount payable on demand at the reporting date. The estimated fair value of these deposits at September 30, 2017 and 2016 was $2.40 billion and $2.34 billion , respectively. (Level 1) The fair value of certificates of deposit is estimated by discounting future cash flows using current London Interbank Offered Rates ("LIBOR"). The estimated fair value of certificates of deposit at September 30, 2017 and 2016 was $2.92 billion and $2.87 billion , respectively. (Level 2) FHLB borrowings and repurchase agreements - The fair value of fixed-maturity borrowed funds is estimated by discounting estimated future cash flows using current offer rates. (Level 2) Interest rate swaps - The fair value of the interest rate swaps was determined using discounted cash flow analysis using observable market-based inputs. (Level 2)

Other Comprehensive Income

Other Comprehensive Income	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Other Comprehensive Income	OTHER COMPREHENSIVE INCOME The following table presents the changes in the components of AOCI, net of tax, for the year ended September 30, 2017 . During the years ended September 30, 2016 and 2015, the only changes in AOCI, net of tax, were related to unrealized gains (losses) on AFS securities and there were no amounts reclassified from AOCI. For the Year Ended September 30, 2017 Unrealized Unrealized Gains (Losses) Gains (Losses) on AFS on Cash Flow Total Securities Hedges AOCI (dollars in thousands) Balance at October 1, 2016 $ 5,915 $ — $ 5,915 Other comprehensive income (loss), before reclassifications (2,625 ) (506 ) (3,131 ) Amount reclassified from AOCI — 134 134 Other comprehensive income (loss) (2,625 ) (372 ) (2,997 ) Balance at September 30, 2017 $ 3,290 $ (372 ) $ 2,918

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Sep. 30, 2017
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Financial Data (Unaudited)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) The following table presents summarized quarterly data for each of the years indicated for the Company. First Second Third Fourth Quarter Quarter Quarter Quarter Total (Dollars and counts in thousands, except per share amounts) 2017 Total interest and dividend income $ 75,322 $ 77,660 $ 79,630 $ 80,574 $ 313,186 Net interest and dividend income 47,306 49,054 49,364 49,658 195,382 Provision for credit losses — — — — — Net income 20,578 21,587 21,370 20,602 84,137 Basic EPS 0.15 0.16 0.16 0.15 0.63 Diluted EPS 0.15 0.16 0.16 0.15 0.63 Dividends declared per share 0.375 0.085 0.335 0.085 0.88 Average number of basic shares outstanding 133,697 134,066 134,254 134,314 134,082 Average number of diluted shares outstanding 133,950 134,259 134,360 134,404 134,244 2016 Total interest and dividend income $ 74,359 $ 75,632 $ 75,527 $ 75,595 $ 301,113 Net interest and dividend income 47,982 48,538 47,930 47,732 192,182 Provision for credit losses — — — (750 ) (750 ) Net income 20,718 21,527 20,551 20,698 83,494 Basic EPS 0.16 0.16 0.15 0.16 0.63 Diluted EPS 0.16 0.16 0.15 0.16 0.63 Dividends declared per share 0.335 0.085 0.335 0.085 0.84 Average number of basic shares outstanding 132,822 132,960 133,102 133,296 133,045 Average number of diluted shares outstanding 132,911 133,031 133,251 133,493 133,176

Parent Company Financial Inform

Parent Company Financial Information (Parent Company Only)	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Information (Parent Company Only)	PARENT COMPANY FINANCIAL INFORMATION (PARENT COMPANY ONLY) The Company serves as the holding company for the Bank (see "Note 1. Summary of Significant Accounting Policies"). The Company's (parent company only) balance sheets at the dates presented, and the related statements of income and cash flows for each of the years presented are as follows: BALANCE SHEETS SEPTEMBER 30, 2017 and 2016 (Dollars in thousands, except per share amounts) 2017 2016 ASSETS: Cash and cash equivalents $ 120,785 $ 108,197 Investment in the Bank 1,204,781 1,240,827 Note receivable - ESOP 42,557 43,790 Other assets 365 389 TOTAL ASSETS $ 1,368,488 $ 1,393,203 LIABILITIES: Income taxes payable, net $ 88 $ 128 Accounts payable and accrued expenses 52 74 Deferred income tax liabilities, net 35 37 Total liabilities 175 239 STOCKHOLDERS' EQUITY: Preferred stock, $.01 par value; 100,000,000 shares authorized, no shares issued or outstanding — — Common stock, $.01 par value; 1,400,000,000 shares authorized, 138,223,835 and 137,486,172 shares issued and outstanding as of September 30, 2017 and 2016, respectively 1,382 1,375 Additional paid-in capital 1,167,368 1,156,855 Unearned compensation - ESOP (37,995 ) (39,647 ) Retained earnings 234,640 268,466 AOCI, net of tax 2,918 5,915 Total stockholders' equity 1,368,313 1,392,964 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 1,368,488 $ 1,393,203 STATEMENTS OF INCOME YEARS ENDED SEPTEMBER 30, 2017, 2016, and 2015 (Dollars in thousands) 2017 2016 2015 INTEREST AND DIVIDEND INCOME: Dividend income from the Bank $ 120,215 $ 117,513 $ 115,359 Interest income from other investments 1,715 1,725 1,835 Total interest and dividend income 121,930 119,238 117,194 NON-INTEREST EXPENSE: Salaries and employee benefits 896 827 835 Regulatory and outside services 247 261 243 Other non-interest expense 561 558 517 Total non-interest expense 1,704 1,646 1,595 INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 120,226 117,592 115,599 INCOME TAX EXPENSE 4 28 84 INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 120,222 117,564 115,515 EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY (36,085 ) (34,070 ) (37,422 ) NET INCOME $ 84,137 $ 83,494 $ 78,093 STATEMENTS OF CASH FLOWS YEARS ENDED SEPTEMBER 30, 2017, 2016, and 2015 (Dollars in thousands) 2017 2016 2015 CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 84,137 $ 83,494 $ 78,093 Adjustments to reconcile net income to net cash provided by operating activities: Equity in excess of distribution over earnings of subsidiary 36,085 34,070 37,422 Depreciation of equipment 29 30 30 Provision for deferred income taxes (2 ) 2 428 Changes in: Other assets (5 ) 1 35 Income taxes receivable/payable (40 ) 445 3,300 Accounts payable and accrued expenses (22 ) 14 1 Net cash flows provided by operating activities 120,182 118,056 119,309 CASH FLOWS FROM INVESTING ACTIVITIES: Principal collected on notes receivable from ESOP 1,233 1,194 1,156 Net cash flows provided by investing activities 1,233 1,194 1,156 CASH FLOWS FROM FINANCING ACTIVITIES: Net payment from subsidiary related to restricted stock awards 293 473 95 Dividends paid (117,963 ) (111,767 ) (114,162 ) Repurchase of common stock — — (50,034 ) Stock options exercised 8,843 4,070 267 Net cash flows used in financing activities (108,827 ) (107,224 ) (163,834 ) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 12,588 12,026 (43,369 ) CASH AND CASH EQUIVALENTS: Beginning of year 108,197 96,171 139,540 End of year $ 120,785 $ 108,197 $ 96,171

Summary Of Significant Accoun26

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Description of Business	Capitol Federal Financial, Inc. (the "Company") provides a full range of retail banking services through its wholly-owned subsidiary, Capitol Federal Savings Bank (the "Bank"), a federal savings bank, which has 37 traditional and 10 in-store banking offices serving primarily the metropolitan areas of Topeka, Wichita, Lawrence, Manhattan, Emporia and Salina, Kansas and portions of the metropolitan area of greater Kansas City. The Bank emphasizes mortgage lending, primarily originating and purchasing one- to four-family loans, and providing personal retail financial services. The Bank is subject to competition from other financial institutions and other companies that provide financial services.
Basis of Presentation	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, the Bank. The Bank has a wholly owned subsidiary, Capitol Funds, Inc. Capitol Funds, Inc. has a wholly-owned subsidiary, Capitol Federal Mortgage Reinsurance Company ("CFMRC"). All intercompany accounts and transactions have been eliminated in consolidation. These consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP"), and require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from these estimates and assumptions. The Bank has an expense sharing agreement with the Company that covers the reimbursement of certain expenses that are allocable to the Company. These expenses include compensation, rent for leased office space, and general overhead expenses. The Company, the Bank, Capitol Funds, Inc. and CFMRC have a tax allocation agreement. The Bank is the paying agent to the taxing authorities for the group for all periods presented. Each entity is liable for taxes as if separate tax returns were filed and reimburses the Bank for its pro rata share of the tax liability. If any entity has a tax benefit, the Bank reimburses the entity for its tax benefit.
Cash and Cash Equivalents	Cash and cash equivalents include cash on hand and amounts due from banks. Regulations of the Board of Governors of the Federal Reserve System ("FRB") require federally chartered savings banks to maintain cash reserves against their transaction accounts. Required reserves must be maintained in the form of vault cash, an account at a Federal Reserve Bank, or a pass-through account as defined by the FRB. The amount of interest-earning deposits held at the Federal Reserve Bank of Kansas City ("FRB of Kansas City") as of September 30, 2017 and 2016 was $337.5 million and $264.4 million , respectively. The Bank is in compliance with the FRB requirements. For the years ended September 30, 2017 and 2016 , the average daily balance of required reserves at the FRB of Kansas City was $9.1 million and $8.8 million , respectively.
Net Presentation of Cash Flows Related to Borrowings	During the current fiscal year, the Bank entered into certain FHLB advances with contractual maturities of 90 days or less. Cash flows related to these advances are reported on a net basis in the consolidated statements of cash flows.
Securities	Securities include MBS and agency debentures issued primarily by United States Government-Sponsored Enterprises ("GSE"), including Federal National Mortgage Association, Federal Home Loan Mortgage Corporation and the Federal Home Loan Banks, United States Government agencies, including Government National Mortgage Association, and municipal bonds. Securities are classified as HTM, AFS, or trading based on management's intention for holding the securities on the date of purchase. Generally, classifications are made in response to liquidity needs, asset/liability management strategies, and the market interest rate environment at the time of purchase. Securities that management has the intent and ability to hold to maturity are classified as HTM and reported at amortized cost. Such securities are adjusted for the amortization of premiums and discounts which are recognized as adjustments to interest income over the life of the securities using the level-yield method. Securities that management may sell if necessary for liquidity or asset management purposes are classified as AFS and reported at fair value, with unrealized gains and losses reported as a component of AOCI within stockholders' equity, net of deferred income taxes. The amortization of premiums and discounts are recognized as adjustments to interest income over the life of the securities using the level-yield method. Gains or losses on the disposition of AFS securities are recognized using the specific identification method. The Company primarily uses prices obtained from third party pricing services to determine the fair value of securities. See additional discussion of fair value of AFS securities in "Note 13. Fair Value of Financial Instruments." Securities that are purchased and held principally for resale in the near future are classified as trading securities and are reported at fair value, with unrealized gains and losses included in non-interest income in the consolidated statements of income. During the fiscal years ended September 30, 2017 and 2016 , neither the Company nor the Bank maintained a trading securities portfolio. Management monitors securities in the investment portfolio for impairment on an ongoing basis and performs a formal review quarterly. The process involves monitoring market events and other items that could impact issuers. The evaluation includes, but is not limited to, such factors as: the nature of the investment, the length of time the security has had a fair value less than the amortized cost basis, the cause(s) and severity of the loss, expectation of an anticipated recovery period, recent events specific to the issuer or industry including the issuer's financial condition and current ability to make future payments in a timely manner, external credit ratings and recent downgrades in such ratings, management's intent to sell and whether it is more likely than not management would be required to sell prior to recovery for debt securities. Management determines whether other-than-temporary losses should be recognized for impaired securities by assessing all known facts and circumstances surrounding the securities. If management intends to sell an impaired security or if it is more likely than not that management will be required to sell an impaired security before recovery of its amortized cost basis, an other-than-temporary impairment has occurred and the difference between amortized cost and fair value will be recognized as a loss in earnings and the security will be written down to fair value.
Loans Receivable	Loans receivable that management has the intent and ability to hold for the foreseeable future are carried at the amount of unpaid principal, net of ACL, undisbursed loan funds, unamortized premiums and discounts, and deferred loan origination fees and costs. Net loan origination fees and costs, and premiums and discounts are amortized as yield adjustments to interest income using the level-yield method. Interest on loans is credited to income as earned and accrued only if deemed collectible. Troubled debt restructurings ("TDRs") - For borrowers experiencing financial difficulties, the Bank may grant a concession to the borrower, resulting in a TDR. Such concessions generally involve extensions of loan maturity dates, the granting of periods during which the payment of only interest and escrow is required, reductions in interest rates, and loans that have been discharged under Chapter 7 bankruptcy proceedings where the borrower has not reaffirmed the debt. The Bank does not forgive principal or interest nor does it commit to lend additional funds, except for situations generally involving the capitalization of delinquent interest and/or escrow not to exceed the original loan balance, to these borrowers. Delinquent loans - A loan is considered delinquent when payment has not been received within 30 days of its contractual due date. The number of days delinquent is determined by the number of scheduled payments that remain unpaid, assuming a period of 30 days between each scheduled payment. Nonaccrual loans - The accrual of income on loans is discontinued when interest or principal payments are 90 days in arrears. We also report certain TDR loans as nonaccrual loans that are required to be reported as such pursuant to regulatory reporting requirements. Loans on which the accrual of income has been discontinued are designated as nonaccrual and outstanding interest previously credited beyond 90 days delinquent is reversed. A nonaccrual loan is returned to accrual status once the contractual payments have been made to bring the loan less than 90 days past due or, in the case of a TDR loan, the borrower has made the required consecutive loan payments. Impaired loans - A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due, including principal and interest, according to the original contractual terms of the loan agreement. Interest income on impaired loans is recognized in the period collected unless the ultimate collection of principal is considered doubtful. Loans reported as impaired loans include loans partially charged-off and TDRs.
Allowance for Credit Losses	The ACL represents management's best estimate of the amount of inherent losses in the loan portfolio as of the balance sheet date. It involves a high degree of complexity and requires management to make difficult and subjective judgments and assumptions about highly uncertain matters. Management's methodology for assessing the appropriateness of the ACL consists of a formula analysis model, along with analyzing and considering several other relevant internal and external data elements. The use of different judgments and assumptions could cause reported results to differ significantly. Management maintains the ACL through provisions for credit losses that are either charged or credited to income. One- to four-family loans, including home equity loans, are individually evaluated for loss when the loan is generally 180 days delinquent and any losses are charged-off. Losses are based on new collateral values obtained through appraisals, less estimated costs to sell. Anticipated private mortgage insurance proceeds are taken into consideration when calculating the loss amount. An updated appraisal is requested, at a minimum, every 12 months thereafter if the loan is 180 days or more delinquent or in foreclosure. If the Bank holds the first and second mortgage, both loans are combined when evaluating whether there is a potential loss on the loan. For commercial real estate loans, losses are charged-off when the collection of such amounts is determined to be unlikely. When a non-real estate secured loan, which includes consumer loans - other, is 120 days delinquent, any identified losses are charged-off. Charge-offs for any loan type may also occur at any time if the Bank has knowledge of the existence of a potential loss. The primary risk characteristics inherent in the one- to four-family and consumer loan portfolios are a decline in economic conditions, elevated levels of unemployment or underemployment, and declines in residential real estate values. Any one or a combination of these events may adversely affect borrowers' ability to repay their loans, resulting in increased delinquencies, non-performing assets, loan losses, and future loan loss provisions. Although the commercial real estate loan portfolio is subject to the same risk of declines in economic conditions, the primary risk characteristics inherent in this portfolio include the ability of the borrower to sustain sufficient cash flows from leases and to control expenses to satisfy their contractual debt payments, and/or the ability to utilize personal and/or business resources to pay their contractual debt payments if the cash flows are not sufficient. Additionally, if the Bank were to repossess the secured collateral of a commercial real estate loan, the pool of potential buyers is typically limited more than that for a residential property. This increases the risk that the Bank could hold the property for an extended period of time and/or potentially be forced to sell at a discounted price, resulting in additional losses. Each quarter end, a formula analysis is prepared which segregates the loan portfolio into categories based on certain risk characteristics. The categories include the following: one- to four-family loans; commercial real estate loans; consumer home equity loans; and other consumer loans. Home equity loans with the same underlying collateral as a one- to four-family loan are combined with the one- to four-family loan in the formula analysis model to calculate a combined loan-to-value ("LTV") ratio. The one- to four-family loan portfolio and related home equity loans are segregated into additional categories based on the following risk characteristics: loan source (originated, correspondent purchased, or bulk purchased), interest payments (fixed-rate and adjustable-rate), LTV ratios, borrower's credit scores, and certain geographic locations. The categories were derived by management based on reviewing the historical performance of the one- to four-family loan portfolio and taking into consideration current economic conditions, such as trends in residential real estate values in certain areas of the U.S. and unemployment rates. Impaired loans are not included in the formula analysis as they are individually evaluated for loss. Historical loss factors are applied to each loan category in the formula analysis model. Each quarter end, management reviews historical losses over a look-back time period and utilizes the historical loss time periods believed to be the most appropriate considering the current economic conditions. The historical loss time period is then adjusted for a loss emergence time period, which represents the estimated time period from the date of a loss event to the date we recognize a charge-off/loss. Qualitative loss factors are utilized in the formula analysis model to reflect risks inherent in each loan category that are not captured by the historical loss factors. The qualitative loss factors for one- to four-family and consumer loan portfolios take into consideration such items as: unemployment rate trends, residential real estate value trends, credit score trends, delinquent loan trends, and industry and peer charge-off information. The qualitative loss factors for the commercial real estate loan portfolio take into consideration the composition of the portfolio along with industry and peer charge-off information and certain ACL ratios. As loans are classified or become delinquent, the qualitative loss factors increase for each respective loan category. The qualitative loss factors were derived by management based on a review of the historical performance of the respective loan portfolios and industry and peer information for those loan portfolios with no or limited historical loss experience, along with consideration of current economic conditions and the likely impact such conditions might have to the performance of the loan portfolio. Management utilizes the formula analysis model, along with analyzing and considering several other relevant internal and external data elements when evaluating the adequacy of the ACL. Such data elements include the trend and composition of delinquent loans and non-performing loans, trends in foreclosed property and short sale transactions and charge-off activity, the current status and trends of local and national employment levels, trends and current conditions in the housing markets, loan growth and concentrations, industry and peer charge-off and ACL information, and certain ACL ratios such as ACL to loans receivable, net and annualized historical losses. Since the Bank's loan portfolio is primarily concentrated in one- to four-family real estate, management monitors residential real estate market value trends in the Bank's local market areas and geographic sections of the U.S. by reference to various industry and market reports, economic releases and surveys, and management's general and specific knowledge of the real estate markets in which the Bank lends, in order to determine what impact, if any, such trends may have on the level of ACL. Reviewing these data elements assists management in evaluating the overall credit quality of the loan portfolio and the reasonableness of the ACL on an ongoing basis, and whether changes need to be made to the Bank's ACL methodology. Management seeks to apply the ACL methodology in a consistent manner; however, the methodology can be modified in response to changing conditions. Although management believes the ACL was at a level adequate to absorb inherent losses in the loan portfolio at September 30, 2017, the level of the ACL remains an estimate that is subject to significant judgment and short-term changes.
Federal Home Loan Bank Stock	As a member of FHLB Topeka, the Bank is required to acquire and hold shares of FHLB stock. The Bank's holding requirement varies based on the Bank's activities, primarily the Bank's outstanding borrowings, with FHLB. FHLB stock is carried at cost and is considered a restricted asset because it cannot be pledged as collateral or bought or sold on the open market and it also has certain redemption restrictions. Management conducts a quarterly evaluation to determine if any FHLB stock impairment exists. The quarterly impairment evaluation focuses primarily on the capital adequacy and liquidity of FHLB, while also considering the impact that legislative and regulatory developments may have on FHLB. Stock and cash dividends received on FHLB stock are reflected as dividend income in the consolidated statements of income.
Premises and Equipment	Land is carried at cost. Buildings, leasehold improvements, and furniture, fixtures and equipment are carried at cost less accumulated depreciation and leasehold amortization. Buildings, furniture, fixtures and equipment are depreciated over their estimated useful lives using the straight-line method. Buildings have an estimated useful life of 39 years. Structural components of the buildings generally have an estimated life of 15 years. Furniture, fixtures and equipment have an estimated useful life of three to seven years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the term of the respective leases, which is generally three to 15 years. The costs for major improvements and renovations are capitalized, while maintenance, repairs and minor improvements are charged to operating expenses as incurred. Gains and losses on dispositions are recorded as non-interest income or non-interest expense as incurred.
Income Taxes	The Company utilizes the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recognized for the tax consequences of temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. Deferred income tax expense (benefit) represents the change in deferred income tax assets and liabilities excluding the tax effects of the change in net unrealized gain (loss) on AFS securities, interest rate swaps and changes in the market value of restricted stock between the grant date and vesting date. Income tax related penalties and interest are included in income tax expense in the consolidated statements of income. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Certain tax benefits attributable to stock options and restricted stock are credited to additional paid-in capital. To the extent that management considers it more likely than not that a deferred tax asset will not be recovered, a valuation allowance is recorded. All positive and negative evidence is reviewed in determining how much of a valuation allowance is recognized on a quarterly basis. Certain accounting literature prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of an uncertain tax position taken, or expected to be taken, in a tax return. Interest and penalties related to unrecognized tax benefits are recognized in income tax expense in the consolidated statements of income. Accrued interest and penalties related to unrecognized tax benefits are included within the related tax liabilities line in the consolidated balance sheet.
Employee Stock Ownership Plan	The funds borrowed by the ESOP from the Company to purchase the Company's common stock are being repaid from dividends paid on unallocated ESOP shares and, if necessary, contributions by the Bank. The shares pledged as collateral are reported as a reduction of stockholders' equity at cost. As ESOP shares are committed to be released from collateral each quarter, the Company records compensation expense based on the average market price of the Company's stock during the quarter. Additionally, the shares become outstanding for EPS computations once they are committed to be released. The eligibility criteria for participation in the Company's ESOP is a minimum of one year of service, at least age 21 , and at least 1,000 hours of employment in each plan year.
Stock-based Compensation	The Company has share-based plans under which stock options and restricted stock awards have been granted. Compensation expense is recognized over the service period of the share-based payment award. The Company utilizes a fair-value-based measurement method in accounting for the share-based payment transactions with employees, except for equity instruments held by the ESOP. The Company applies the modified prospective method in which compensation cost is recognized over the service period for all awards granted.
Borrowed Funds	The Bank has entered into repurchase agreements, which are sales of securities under agreements to repurchase, with approved counterparties. These agreements are recorded as financing transactions, and thereby reported as liabilities on the consolidated balance sheet, as the Bank maintains effective control over the transferred securities and the securities continue to be carried in the Bank's securities portfolio. The Bank has obtained borrowings from FHLB in the form of advances and a line of credit. Total FHLB borrowings are secured by certain qualifying loans pursuant to a blanket collateral agreement with FHLB and certain securities, as necessary. Additionally, the Bank is authorized to borrow from the Federal Reserve Bank's "discount window." The Company uses interest rate swaps as part of its interest rate risk management strategy to hedge the variable cash outflows associated with certain borrowings. Interest rate swaps are carried at fair value in the Company's consolidated financial statements. For interest rate swaps that are designated and qualify as cash flow hedges, the effective portion of changes in the fair value of such agreements are recorded in AOCI and are subsequently reclassified into interest expense in the period that interest on the borrowings affects earnings. The ineffective portion of the change in fair value of the interest rate swap is recognized directly in earnings. Effectiveness is assessed using regression analysis. At the inception of a hedge, the Company documents certain items, including the relationship between the hedging instrument and the hedged item, the risk management objective and the nature of the risk being hedged, a description of how effectiveness will be measured and an evaluation of hedged transaction effectiveness.
Segment Information	As a community-oriented financial institution, substantially all of the Bank's operations involve the delivery of loan and deposit products to customers. Management makes operating decisions and assesses performance based on an ongoing review of these community banking operations, which constitute the Company's only operating segment for financial reporting purposes.
Low Income Housing Partnerships	As part of the Bank's community reinvestment initiatives, the Bank invests in affordable housing limited partnerships ("low income housing partnerships") that make equity investments in affordable housing properties. The Bank is a limited partner in each partnership in which it invests. A separate, unrelated third party is the general partner. The Bank receives affordable housing tax credits and other tax benefits for these investments. Previously, the Bank accounted for low income housing partnerships using the equity method of accounting as two of the Bank's officers were involved in the operational management of the low income housing partnership investment group. Effective September 30, 2016, those two Bank officers discontinued their involvement in the operational management of the investment group. The Bank started using the proportional method of accounting for its low income housing partnership investments on October 1, 2016. See "Note 6. Low Income Housing Partnerships" for additional information.
Earnings Per Share	Basic EPS is computed by dividing income available to common stockholders by the weighted average number of shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options) were exercised or resulted in the issuance of common stock. These potentially dilutive shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. Shares issued and shares reacquired during any period are weighted for the portion of the period that they were outstanding. In computing both basic and diluted EPS, the weighted average number of common shares outstanding includes the ESOP shares previously allocated to participants and shares committed to be released for allocation to participants and restricted stock shares which have vested or have been allocated to participants. ESOP shares that have not been committed to be released are excluded from the computation of basic and diluted EPS. Unvested restricted stock awards contain nonforfeitable rights to dividends and are treated as participating securities in the computation of EPS pursuant to the two-class method.
Comprehensive Income	Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on AFS securities and changes in the accumulated gains/losses on effective cash flow hedging instruments, net of taxes.
Recent Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers . The ASU, as amended, implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of the amended guidance is that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, the amended guidance identifies specific steps an entity should apply in order to achieve this principle. The amended guidance requires entities to disclose both quantitative and qualitative information regarding contracts with customers. ASU 2014-09 will become effective for the Company on October 1, 2018. The majority of the Company's revenue is composed of interest income from loans and securities which are explicitly excluded from the amended ASU; therefore the amended ASU will likely not have a material impact to the Company's consolidated financial condition and results of operations, but it will likely result in expanded disclosures. The Company's evaluation of the amended ASU and its impact on components of non-interest income is ongoing. In January 2016, the FASB issued ASU 2016-01, Financial Instruments, Recognition and Measurement of Financial Assets and Liabilities . The ASU supersedes certain accounting guidance related to equity securities with readily determinable fair values and the related impairment assessment. An entity's equity investments that are accounted for under the equity method of accounting or result in consolidation of an investee are not included within the scope of this ASU. The ASU requires public business entities to utilize the exit price notation in determining fair value for financial instruments measured at amortized cost on the balance sheet. The ASU requires additional reporting in other comprehensive income for financial liabilities measured at fair value in accordance with the fair value option. The ASU also requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balances or in the notes to the financial statements. ASU 2016-01 will become effective for the Company on October 1, 2018. The Company is currently evaluating the impact that this ASU may have on the Company's consolidated financial condition, results of operations and disclosures. In February 2016, the FASB issued ASU 2016-02, Leases . The ASU amends lease accounting guidance by requiring that lessees recognize the assets and liabilities arising from leases on the balance sheet. Additionally, the ASU requires entities to disclose both quantitative and qualitative information regarding their leasing activities. ASU 2016-02 will become effective for the Company on October 1, 2019. The Company is currently in the process of accumulating lease data and developing an inventory of leases. 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. The Company is continuing to evaluate the impact this ASU may have on the Company's consolidated financial condition, results of operations and disclosures. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, along with simplifying the classification in the statement of cash flows. The ASU became effective for the Company on October 1, 2017. Upon adoption, the Company elected to account for forfeitures of stock-based compensation awards when they occur. The Company will recognize excess tax benefits and tax deficiencies in income tax expense on the consolidated statements of income and present them within operating activities on the consolidated statements of cash flows. This ASU did not have a material impact on the Company's consolidated financial condition or results of operations at the time of adoption. However, the impact of tax benefits and the timing of their recognition within income tax expense is unpredictable, as these benefits are recognized primarily as a result of stock options being exercised. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments . The ASU replaces the incurred loss impairment methodology in current GAAP, which requires credit losses to be recognized when it is probable that a loss has incurred, with a new impairment methodology. The new impairment methodology requires an entity to measure, at each reporting date, the expected credit losses of financial assets not measured at fair value, such as loans, HTM debt securities, and loan commitments, over their contractual lives. Under the new impairment methodology, expected credit losses will be measured at each reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Additionally, the ASU amends the current credit loss measurements for AFS debt securities. Credit losses related to AFS debt securities will be recorded through the ACL rather than as a direct write-down as per current GAAP. The ASU also requires enhanced disclosures related to credit quality and significant estimates and judgments used by management when estimating credit losses. The ASU will become effective for the Company on October 1, 2020. The Company has developed an implementation plan and is in the process of reviewing and assessing its processes and systems and identifying the necessary data to implement the ASU. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Target Improvements to Accounting for Hedging Activities . The ASU amends the hedge accounting recognition and presentation requirements in current GAAP. The purpose of the ASU was to improve transparency of hedging relationships in the financial statements and to reduce the complexity of applying hedge accounting for preparers. The ASU will become effective for the Company on October 1, 2019. The Company is currently evaluating the effect of the ASU on the Company's consolidated financial condition, results of operations and disclosures.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Shares acquired by the ESOP are not considered in the basic average shares outstanding until the shares are committed for allocation or vested to an employee's individual account. Unvested shares awarded pursuant to the Company's restricted stock benefit plans are treated as participating securities in the computation of EPS pursuant to the two-class method as they contain nonforfeitable rights to dividends. The two-class method is an earnings allocation that determines EPS for each class of common stock and participating security. For the Year Ended September 30, 2017 2016 2015 (Dollars in thousands, except per share amounts) Net income $ 84,137 $ 83,494 $ 78,093 Income allocated to participating securities (44 ) (66 ) (116 ) Net income available to common stockholders $ 84,093 $ 83,428 $ 77,977 Average common shares outstanding 134,019,962 132,982,815 135,321,235 Average committed ESOP shares outstanding 62,458 62,400 62,458 Total basic average common shares outstanding 134,082,420 133,045,215 135,383,693 Effect of dilutive stock options 161,442 131,161 24,810 Total diluted average common shares outstanding 134,243,862 133,176,376 135,408,503 Net EPS: Basic $ 0.63 $ 0.63 $ 0.58 Diluted $ 0.63 $ 0.63 $ 0.58 Antidilutive stock options, excluded from the diluted average common shares outstanding calculation 200,800 886,417 1,248,744

Securities (Tables)

Securities (Tables)	12 Months Ended
	Sep. 30, 2017
Marketable Securities [Abstract]
Amortized Cost, Estimated Fair Value, and Gross Unrealized Gains and Losses Of AFS Securities	The following tables reflect the amortized cost, estimated fair value, and gross unrealized gains and losses of AFS and HTM securities at the dates presented. The majority of the MBS and investment securities portfolios are composed of securities issued by GSEs. September 30, 2017 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 271,300 $ 16 $ 587 $ 270,729 MBS 135,644 5,923 51 141,516 Trust preferred securities 2,067 — 16 2,051 Municipal bonds 1,530 5 — 1,535 $ 410,541 $ 5,944 $ 654 $ 415,831 HTM: MBS $ 800,931 $ 10,460 $ 5,295 $ 806,096 Municipal bonds 26,807 119 13 26,913 $ 827,738 $ 10,579 $ 5,308 $ 833,009 September 30, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 346,226 $ 815 $ 3 $ 347,038 MBS 169,442 9,069 4 178,507 Trust preferred securities 2,123 — 367 1,756 $ 517,791 $ 9,884 $ 374 $ 527,301 HTM: MBS $ 1,067,571 $ 22,862 $ 1,219 $ 1,089,214 Municipal bonds 33,303 357 7 33,653 $ 1,100,874 $ 23,219 $ 1,226 $ 1,122,867
Amortized Cost, Estimated Fair Value, and Gross Unrealized Gains and Losses Of HTM Securities	The following tables reflect the amortized cost, estimated fair value, and gross unrealized gains and losses of AFS and HTM securities at the dates presented. The majority of the MBS and investment securities portfolios are composed of securities issued by GSEs. September 30, 2017 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 271,300 $ 16 $ 587 $ 270,729 MBS 135,644 5,923 51 141,516 Trust preferred securities 2,067 — 16 2,051 Municipal bonds 1,530 5 — 1,535 $ 410,541 $ 5,944 $ 654 $ 415,831 HTM: MBS $ 800,931 $ 10,460 $ 5,295 $ 806,096 Municipal bonds 26,807 119 13 26,913 $ 827,738 $ 10,579 $ 5,308 $ 833,009 September 30, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: GSE debentures $ 346,226 $ 815 $ 3 $ 347,038 MBS 169,442 9,069 4 178,507 Trust preferred securities 2,123 — 367 1,756 $ 517,791 $ 9,884 $ 374 $ 527,301 HTM: MBS $ 1,067,571 $ 22,862 $ 1,219 $ 1,089,214 Municipal bonds 33,303 357 7 33,653 $ 1,100,874 $ 23,219 $ 1,226 $ 1,122,867
Schedule Of Estimated Fair Value And Gross Unrealized Losses Of Securities In Continuous Unrealized Loss Position	The following tables summarize the estimated fair value and gross unrealized losses of those securities on which an unrealized loss at the dates presented was reported and the continuous unrealized loss position for less than 12 months and equal to or greater than 12 months as of the dates presented. September 30, 2017 Less Than 12 Months Equal to or Greater Than 12 Months Estimated Unrealized Estimated Unrealized Fair Value Losses Fair Value Losses (Dollars in thousands) AFS: GSE debentures $ 224,421 $ 539 $ 24,952 $ 48 MBS 9,648 46 673 5 Trust preferred securities — — 2,051 16 $ 234,069 $ 585 $ 27,676 $ 69 HTM: MBS $ 259,200 $ 1,582 $ 201,094 $ 3,713 Municipal bonds 5,638 8 1,460 5 $ 264,838 $ 1,590 $ 202,554 $ 3,718 September 30, 2016 Less Than 12 Months Equal to or Greater Than 12 Months Estimated Unrealize d Estimated Unrealized Fair V alue Losses Fair Value Losses (Dollars in thousands) AFS: GSE debentures $ 24,997 $ 3 $ — $ — MBS — — 654 4 Trust preferred securities — — 1,756 367 $ 24,997 $ 3 $ 2,410 $ 371 HTM: MBS $ 147,930 $ 538 $ 66,646 $ 681 Municipal bonds 4,771 6 391 1 $ 152,701 $ 544 $ 67,037 $ 682
Schedule Of Contractual Maturities	The amortized cost and estimated fair value of debt securities as of September 30, 2017 , by contractual maturity, are shown below. Actual principal repayments may differ from contractual maturities due to prepayment or early call privileges by the issuer. In the case of MBS, borrowers on the underlying loans generally have the right to prepay their loans without prepayment penalty. For this reason, MBS are not included in the maturity categories. AFS HTM Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value (Dollars in thousands) One year or less $ 121,340 $ 121,253 $ 6,141 $ 6,156 One year through five years 151,490 151,011 20,448 20,534 Five years through ten years — — 218 223 Ten years and thereafter 2,067 2,051 — — 274,897 274,315 26,807 26,913 MBS 135,644 141,516 800,931 806,096 $ 410,541 $ 415,831 $ 827,738 $ 833,009
Schedule Of Taxable And Non-taxable Components Of Interest Income	The following table presents the taxable and non-taxable components of interest income on investment securities for the periods presented. For the Year Ended September 30, 2017 2016 2015 (Dollars in thousands) Taxable $ 3,847 $ 5,255 $ 6,431 Non-taxable 515 670 751 $ 4,362 $ 5,925 $ 7,182
Schedule Of Carrying Value Of Securities Pledged As Collateral	The following table summarizes the carrying value of securities pledged as collateral for the obligations indicated below as of the dates presented. September 30, 2017 2016 (Dollars in thousands) Public unit deposits $ 499,993 $ 419,282 Repurchase agreements 214,298 217,374 FRB of Kansas City 11,769 15,938 $ 726,060 $ 652,594

Loans Receivable And Allowanc29

Loans Receivable And Allowance For Credit Losses (Tables)	12 Months Ended
	Sep. 30, 2017
Loans and Leases Receivable Disclosure [Abstract]
Summary of Loans Receivable	Loans receivable, net at September 30, 2017 and 2016 is summarized as follows: 2017 2016 (Dollars in thousands) Real estate loans: One- to four-family: Originated $ 3,959,232 $ 4,005,615 Correspondent purchased 2,445,311 2,206,072 Bulk purchased 351,705 416,653 Construction 30,647 39,430 Total 6,786,895 6,667,770 Commercial: Permanent 183,030 110,768 Construction 86,952 43,375 Total 269,982 154,143 Total real estate loans 7,056,877 6,821,913 Consumer loans: Home equity 122,066 123,345 Other 3,808 4,264 Total consumer loans 125,874 127,609 Total loans receivable 7,182,751 6,949,522 Less: ACL 8,398 8,540 Discounts/unearned loan fees 24,962 24,933 Premiums/deferred costs (45,680 ) (41,975 ) $ 7,195,071 $ 6,958,024
Recorded Investment in Loans, Past Due	The following tables present the recorded investment, by class, in loans 30 to 89 days delinquent, loans 90 or more days delinquent or in foreclosure, total delinquent loans, current loans, and total recorded investment at the dates presented. The recorded investment in loans is defined as the unpaid principal balance of a loan, less charge-offs and inclusive of unearned loan fees and deferred costs. At September 30, 2017 and 2016 , all loans 90 or more days delinquent were on nonaccrual status. September 30, 2017 90 or More Days Total Total 30 to 89 Days Delinquent or Delinquent Current Recorded Delinquent in Foreclosure Loans Loans Investment (Dollars in thousands) One- to four-family - originated $ 13,216 $ 5,500 $ 18,716 $ 3,956,598 $ 3,975,314 One- to four-family - correspondent 1,855 92 1,947 2,477,916 2,479,863 One- to four-family - bulk purchased 3,233 3,399 6,632 346,807 353,439 Commercial real estate — — — 268,979 268,979 Consumer - home equity 467 406 873 121,193 122,066 Consumer - other 33 4 37 3,771 3,808 $ 18,804 $ 9,401 $ 28,205 $ 7,175,264 $ 7,203,469 September 30, 2016 90 or More Days Total Total 30 to 89 Days Delinquent or Delinquent Current Recorded Delinquent in Foreclosure Loans Loans Investment (Dollars in thousands) One- to four-family - originated $ 13,545 $ 8,153 $ 21,698 $ 4,007,012 $ 4,028,710 One- to four-family - correspondent 3,389 992 4,381 2,233,941 2,238,322 One- to four-family - bulk purchased 5,082 7,380 12,462 406,379 418,841 Commercial real estate — — — 153,082 153,082 Consumer - home equity 635 520 1,155 122,190 123,345 Consumer - other 62 9 71 4,193 4,264 $ 22,713 $ 17,054 $ 39,767 $ 6,926,797 $ 6,966,564
Recorded Investment in Loans, Nonaccrual	The following table presents the recorded investment, by class, in loans classified as nonaccrual at the dates presented. The decrease in nonaccrual loans at September 30, 2017 compared to the prior year was due mainly to a decrease in loans 90 or more days delinquent, along with a decrease in loans reported as nonaccrual pursuant to regulatory reporting requirements. September 30, 2017 2016 (Dollars in thousands) One- to four-family - originated $ 10,054 $ 17,086 One- to four-family - correspondent 1,804 3,788 One- to four-family - bulk purchased 4,264 7,411 Commercial real estate — — Consumer - home equity 519 848 Consumer - other 4 10 $ 16,645 $ 29,143
Recorded Investment in Classified Loans	The following table sets forth the recorded investment in loans classified as special mention or substandard, by class, at the dates presented. Special mention and substandard loans are included in the ACL formula analysis model if the loans are not individually evaluated for loss. Loans classified as doubtful or loss are individually evaluated for loss. At the dates presented, there were no loans classified as doubtful, and all loans classified as loss were fully charged-off. September 30, 2017 2016 Special Mention Substandard Special Mention Substandard (Dollars in thousands) One- to four-family - originated $ 7,031 $ 30,059 $ 10,242 $ 27,818 One- to four-family - correspondent 261 3,800 2,496 5,168 One- to four-family - bulk purchased — 8,005 1,156 11,480 Commercial real estate — — — — Consumer - home equity 9 1,032 54 1,431 Consumer - other — 4 8 16 $ 7,301 $ 42,900 $ 13,956 $ 45,913
Weighted Average Loan-to-Value and Credit Score Information	The following table shows the weighted average credit score and weighted average LTV for one- to four-family loans and consumer home equity loans at the dates presented. Borrower credit scores are intended to provide an indication as to the likelihood that a borrower will repay their debts. Credit scores are updated at least semiannually, with the last update in September 2017 , from a nationally recognized consumer rating agency. The LTV ratios provide an estimate of the extent to which the Bank may incur a loss on any given loan that may go into foreclosure. The consumer - home equity LTV does not take into account the first lien position, if applicable. The LTV ratios were based on the current loan balance and either the lesser of the purchase price or original appraisal, or the most recent Bank appraisal, if available. In most cases, the most recent appraisal was obtained at the time of origination. September 30, 2017 2016 Credit Score LTV Credit Score LTV One- to four-family - originated 767 63 % 766 63 % One- to four-family - correspondent 764 68 764 68 One- to four-family - bulk purchased 757 63 753 64 Consumer - home equity 755 19 755 20 765 64 764 64
Troubled Debt Restructurings on Financing Receivables	TDRs - The following tables present the recorded investment prior to restructuring and immediately after restructuring in all loans restructured during the periods presented. These tables do not reflect the recorded investment at the end of the periods indicated. Any increase in the recorded investment at the time of the restructuring was generally due to the capitalization of delinquent interest and/or escrow balances. During the fourth quarter of fiscal year 2017, management refined its methodology for assessing whether a loan modification qualifies as a TDR which, though not being material, resulted in fewer loans being classified as TDRs. For the Year Ended September 30, 2017 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 112 $ 11,940 $ 12,402 One- to four-family - correspondent 12 2,443 2,459 One- to four-family - bulk purchased 3 1,031 1,048 Commercial real estate — — — Consumer - home equity 17 368 380 Consumer - other — — — 144 $ 15,782 $ 16,289 For the Year Ended September 30, 2016 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 122 $ 17,201 $ 17,557 One- to four-family - correspondent 12 2,592 2,619 One- to four-family - bulk purchased 3 596 594 Commercial real estate — — — Consumer - home equity 19 427 433 Consumer - other 1 8 8 157 $ 20,824 $ 21,211 For the Year Ended September 30, 2015 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family - originated 141 $ 17,265 $ 17,468 One- to four-family - correspondent 2 546 542 One- to four-family - bulk purchased 4 1,140 1,144 Commercial real estate — — — Consumer - home equity 22 479 485 Consumer - other 3 12 12 172 $ 19,442 $ 19,651 The following table provides information on TDRs that became delinquent during the periods presented within 12 months after being restructured. For the Years Ended September 30, 2017 September 30, 2016 September 30, 2015 Number of Recorded Number of Recorded Number of Recorded Contracts Investment Contracts Investment Contracts Investment (Dollars in thousands) One- to four-family - originated 46 $ 4,561 48 $ 5,330 49 $ 5,311 One- to four-family - correspondent 2 148 3 548 3 432 One- to four-family - bulk purchased 2 698 — — 4 890 Commercial real estate — — — — — — Consumer - home equity 16 440 6 174 4 33 Consumer - other — — — — 1 5 66 $ 5,847 57 $ 6,052 61 $ 6,671
Impaired Loans by Class	Impaired loans - The following information pertains to impaired loans, by class, as of the dates presented. During the fourth quarter of fiscal year 2017, management refined its methodology for classifying loans as impaired. The change resulting from this refinement was immaterial. Impaired loans include loans partially charged-off and TDRs. All impaired loans are individually evaluated for loss and all losses are charged-off, resulting in no related ACL for these loans. September 30, 2017 September 30, 2016 Unpaid Unpaid Recorded Principal Related Recorded Principal Related Investment Balance ACL Investment Balance ACL (Dollars in thousands) With no related allowance recorded One- to four-family - originated $ 30,251 $ 30,953 $ — $ 22,982 $ 23,640 $ — One- to four-family - correspondent 3,800 3,771 — 2,963 2,950 — One- to four-family - bulk purchased 7,403 8,606 — 10,985 12,684 — Commercial real estate — — — — — — Consumer - home equity 775 997 — 1,014 1,230 — Consumer - other — 24 — 10 42 — 42,229 44,351 — 37,954 40,546 — With an allowance recorded One- to four-family - originated — — — 13,430 13,476 125 One- to four-family - correspondent — — — 2,662 2,664 4 One- to four-family - bulk purchased — — — 1,650 1,627 49 Commercial real estate — — — — — — Consumer - home equity — — — 548 548 38 Consumer - other — — — 6 6 1 — — — 18,296 18,321 217 Total One- to four-family - originated 30,251 30,953 — 36,412 37,116 125 One- to four-family - correspondent 3,800 3,771 — 5,625 5,614 4 One- to four-family - bulk purchased 7,403 8,606 — 12,635 14,311 49 Commercial real estate — — — — — — Consumer - home equity 775 997 — 1,562 1,778 38 Consumer - other — 24 — 16 48 1 $ 42,229 $ 44,351 $ — $ 56,250 $ 58,867 $ 217 For the Years Ended September 30, 2017 September 30, 2016 September 30, 2015 Average Interest Average Interest Average Interest Recorded Income Recorded Income Recorded Income Investment Recognized Investment Recognized Investment Recognized (Dollars in thousands) With no related allowance recorded One- to four-family - originated $ 24,122 $ 917 $ 12,063 $ 470 $ 11,744 $ 451 One- to four-family - correspondent 3,346 118 495 18 471 10 One- to four-family - bulk purchased 9,852 194 11,022 196 11,153 196 Commercial real estate — — — — — — Consumer - home equity 988 86 628 93 485 29 Consumer - other 7 — 13 1 12 — 38,315 1,315 24,221 778 23,865 686 With an allowance recorded One- to four-family - originated 11,469 434 24,199 983 25,465 1,026 One- to four-family - correspondent 2,018 65 2,669 50 1,759 53 One- to four-family - bulk purchased 1,160 20 2,219 27 2,960 40 Commercial real estate — — — — — — Consumer - home equity 457 36 895 64 795 34 Consumer - other 10 1 13 1 15 2 15,114 556 29,995 1,125 30,994 1,155 Total One- to four-family - originated 35,591 1,351 36,262 1,453 37,209 1,477 One- to four-family - correspondent 5,364 183 3,164 68 2,230 63 One- to four-family - bulk purchased 11,012 214 13,241 223 14,113 236 Commercial real estate — — — — — — Consumer - home equity 1,445 122 1,523 157 1,280 63 Consumer - other 17 1 26 2 27 2 $ 53,429 $ 1,871 $ 54,216 $ 1,903 $ 54,859 $ 1,841
Allowance for Credit Losses	The following is a summary of the loan portfolio and related ACL balances, at the dates presented, by loan portfolio segment disaggregated by the Company's impairment method. There was no ACL for loans individually evaluated for impairment at either date as all losses were charged-off. September 30, 2017 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 3,945,063 $ 2,476,063 $ 346,035 $ 6,767,161 $ 268,979 $ 125,100 $ 7,161,240 Recorded investment in loans individually evaluated for impairment 30,251 3,800 7,404 41,455 — 774 42,229 $ 3,975,314 $ 2,479,863 $ 353,439 $ 6,808,616 $ 268,979 $ 125,874 $ 7,203,469 ACL for loans collectively evaluated for impairment $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 September 30, 2016 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 4,003,750 $ 2,233,347 $ 407,833 $ 6,644,930 $ 153,082 $ 126,504 $ 6,924,516 Recorded investment in loans individually evaluated for impairment 24,960 4,975 11,008 40,943 — 1,105 42,048 $ 4,028,710 $ 2,238,322 $ 418,841 $ 6,685,873 $ 153,082 $ 127,609 $ 6,966,564 ACL for loans collectively evaluated for impairment $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540 Allowance for Credit Losses - The following is a summary of ACL activity, by loan portfolio segment, for the periods presented, and the ending balance of ACL based on the Company's impairment methodology. For the Year Ended September 30, 2017 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540 Charge-offs (72 ) — (216 ) (288 ) — (60 ) (348 ) Recoveries 4 — 165 169 — 37 206 Provision for credit losses (687 ) (180 ) (14 ) (881 ) 904 (23 ) — Ending balance $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 For the Year Ended September 30, 2016 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 4,865 $ 2,115 $ 1,434 $ 8,414 $ 742 $ 287 $ 9,443 Charge-offs (200 ) — (342 ) (542 ) — (88 ) (630 ) Recoveries 77 — 374 451 — 26 477 Provision for credit losses (814 ) (13 ) (401 ) (1,228 ) 466 12 (750 ) Ending balance $ 3,928 $ 2,102 $ 1,065 $ 7,095 $ 1,208 $ 237 $ 8,540 For the Year Ended September 30, 2015 One- to Four-Family Correspondent Bulk Commercial Originated Purchased Purchased Total Real Estate Consumer Total (Dollars in thousands) Beginning balance $ 4,460 $ 1,803 $ 2,323 $ 8,586 $ 400 $ 241 $ 9,227 Charge-offs (424 ) (11 ) (228 ) (663 ) — (72 ) (735 ) Recoveries 56 — 58 114 — 66 180 Provision for credit losses 773 323 (719 ) 377 342 52 771 Ending balance $ 4,865 $ 2,115 $ 1,434 $ 8,414 $ 742 $ 287 $ 9,443

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment, Net [Abstract]
Summary Of The Carrying Value Of Banking Premises And Equipment	A summary of the net carrying value of premises and equipment at September 30, 2017 and 2016 was as follows: 2017 2016 (Dollars in thousands) Land $ 11,670 $ 11,065 Building and improvements 96,401 91,700 Furniture, fixtures and equipment 43,410 42,590 151,481 145,355 Less accumulated depreciation 66,663 62,134 $ 84,818 $ 83,221
Schedule Of Future Minimum Rental Commitments	As of September 30, 2017 , future minimum rental commitments, rounded to the nearest thousand, required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year were as follows: 2018 $ 1,170 2019 1,057 2020 813 2021 703 2022 623 Thereafter 1,906 $ 6,272

Deposits and Borrowed Funds (Ta

Deposits and Borrowed Funds (Tables)	12 Months Ended
	Sep. 30, 2017
Deposits and Borrowed Funds [Abstract]
FHLB Advances	FHLB advances at September 30, 2017 and 2016 were comprised of the following: 2017 2016 (Dollars in thousands) FHLB advances $ 2,175,000 $ 2,375,000 Deferred prepayment penalty (1,192 ) (2,611 ) $ 2,173,808 $ 2,372,389 Weighted average contractual interest rate on FHLB advances 1.96 % 2.17 % Weighted average effective interest rate on FHLB advances (1) 2.09 2.24 (1) The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the variable-rate FHLB advances.
Maturity of Borrowed Funds and Certificates of Deposit	Maturity of Borrowed Funds and Certificates of Deposit - The following table presents the scheduled maturity of FHLB advances, at par, repurchase agreements, and certificates of deposit as of September 30, 2017 : FHLB Repurchase Certificates Advances Agreements of Deposit Amount Amount Amount (Dollars in thousands) 2018 $ 475,000 $ 100,000 $ 1,116,415 2019 500,000 — 748,537 2020 350,000 100,000 591,966 2021 550,000 — 274,805 2022 200,000 — 177,308 Thereafter 100,000 — 1,390 $ 2,175,000 $ 200,000 $ 2,910,421

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Schedule Of Income Tax Expense	Income tax expense for the years ended September 30, 2017 , 2016 , and 2015 consisted of the following: 2017 2016 2015 (Dollars in thousands) Current: Federal $ 38,127 $ 33,298 $ 30,079 State 4,734 4,677 4,395 42,861 37,975 34,474 Deferred: Federal 712 286 2,869 State 210 184 332 922 470 3,201 $ 43,783 $ 38,445 $ 37,675
Differences Between Effective Rates And Statutory Federal Income Tax Rate Computed On Income Before Income Tax Expense	The Company's effective tax rates were 34.2% , 31.5% , and 32.5% for the years ended September 30, 2017 , 2016 , and 2015 , respectively. The increase in the effective tax rate for the year ended September 30, 2017 was due primarily to the accounting method change for low income housing partnership investments. See "Note 1. Summary of Significant Accounting Policies" for further discussion regarding the accounting method change and "Note 6. Low Income Housing Partnerships" for additional information regarding the income tax expense components of the low income housing partnership investments. The differences between such effective rates and the statutory Federal income tax rate computed on income before income tax expense resulted from the following: 2017 2016 2015 Amount % Amount % Amount % (Dollars in thousands) Federal income tax expense computed at statutory Federal rate $ 44,772 35.0 % $ 42,679 35.0 % $ 40,519 35.0 % Increases (decreases) in taxes resulting from: State taxes, net of Federal tax effect 3,452 2.7 3,308 2.7 3,257 2.8 Low income housing tax credits, presented net of proportional amortization in 2017 (2,468 ) (2.0 ) (4,815 ) (4.0 ) (4,316 ) (3.7 ) ESOP related expenses, net (1,052 ) (0.8 ) (1,127 ) (0.9 ) (1,222 ) (1.1 ) Other (921 ) (0.7 ) (1,600 ) (1.3 ) (563 ) (0.5 ) $ 43,783 34.2 % $ 38,445 31.5 % $ 37,675 32.5 %
Deferred Income Tax Expense (Benefit) Results From Temporary Differences In Recognition Of Revenue And Expenses For Tax	Deferred income tax expense represents the change in deferred income tax assets and liabilities excluding the tax effects of the change in net unrealized gain (loss) on AFS securities, interest rate swaps and changes in the market value of restricted stock between the grant date and vesting date. The sources of these differences and the tax effect of each as of September 30, 2017 , 2016 , and 2015 were as follows: 2017 2016 2015 (Dollars in thousands) Salaries, deferred compensation and employee benefits $ 437 $ (143 ) $ (12 ) Low income housing partnerships 285 (318 ) (763 ) ACL 185 480 (75 ) Premises and equipment 14 1,593 (129 ) FHLB stock dividends 4 (1,357 ) 4,083 Capitol Federal Foundation contribution — — 418 Other, net (3 ) 215 (321 ) $ 922 $ 470 $ 3,201
Components Of Net Deferred Income Tax Liabilities	The components of the net deferred income tax liabilities as of September 30, 2017 and 2016 were as follows: 2017 2016 (Dollars in thousands) Deferred income tax assets: Salaries, deferred compensation and employee benefits $ 2,583 $ 3,020 Low income housing partnerships 1,478 1,763 ESOP compensation 1,724 1,566 ACL 711 896 Other 2,621 2,528 Gross deferred income tax assets 9,117 9,773 Valuation allowance (1,795 ) (1,804 ) Gross deferred income tax asset, net of valuation allowance 7,322 7,969 Deferred income tax liabilities: FHLB stock dividends 23,242 23,238 Premises and equipment 6,105 6,091 Unrealized gain on AFS securities 2,000 3,595 Other 433 419 Gross deferred income tax liabilities 31,780 33,343 Net deferred tax liabilities $ 24,458 $ 25,374

Employee Stock Ownership Plan (

Employee Stock Ownership Plan (Tables)	12 Months Ended
	Sep. 30, 2017
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Summary Of Shares Held In The ESOP Trust	Shares may be withdrawn from the ESOP trust due to retirement, termination, or death of the participant. Additionally, a participant may begin to diversify at least 25% of their ESOP shares at age 50 . The following is a summary of shares held in the ESOP trust as of September 30, 2017 and 2016 : 2017 2016 (Dollars in thousands) Allocated ESOP shares 4,369,840 4,392,371 Unreleased ESOP shares 3,799,554 3,964,752 Total ESOP shares 8,169,394 8,357,123 Fair value of unreleased ESOP shares $ 55,853 $ 55,784

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments Outstanding To Originate, Purchase, Or Participate In Loans	The following table summarizes the Bank's loan commitments as of September 30, 2017 and 2016 : 2017 2016 (Dollars in thousands) Originate fixed-rate $ 33,528 $ 68,047 Originate adjustable-rate 9,861 12,257 Purchase/participate fixed-rate 74,104 138,792 Purchase/participate adjustable-rate 52,453 18,653 $ 169,946 $ 237,749

Regulatory Capital Requiremen35

Regulatory Capital Requirements (Tables)	12 Months Ended
	Sep. 30, 2017
Regulatory Capital Requirements [Abstract]
Summary Of Capital And Total Risk-Based Capital Ratios	The Bank and the Company must maintain certain minimum capital ratios as set forth in the table below for capital adequacy purposes. Effective January 1, 2016, the Company and Bank were required to maintain a capital conservation buffer above certain minimum capital ratios for capital adequacy purposes in order to avoid certain restrictions on capital distributions and other payments including dividends, share repurchases, and certain compensation. The required capital conservation buffer is being phased in over a four year period by increasing the required buffer amount by 0.625% each year. The capital conservation buffer was 0.625% at September 30, 2016 and 1.25% at September 30, 2017 . At September 30, 2017 and 2016 , the Bank and Company exceeded the capital conservation buffer requirement. Once fully phased-in, which will be on January 1, 2019 for the Company and Bank, the organization must maintain a balance of capital that exceeds by more than 2.5% each of the minimum risk-based capital ratios in order to satisfy the requirement. Management believes, as of September 30, 2017 , that the Bank and Company meet all capital adequacy requirements to which they are subject and there were no conditions or events subsequent to September 30, 2017 that would change the Bank's or Company's category. To Be Well Capitalized Under Prompt For Capital Corrective Action Actual Adequacy Purposes Provisions Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Bank As of September 30, 2017 Tier 1 leverage ratio $ 1,201,863 10.8 % $ 444,877 4.0 % $ 556,097 5.0 % Common Equity Tier 1 ("CET1") capital ratio 1,201,863 27.2 199,181 4.5 287,706 6.5 Tier 1 capital ratio 1,201,863 27.2 265,575 6.0 354,100 8.0 Total capital ratio 1,210,261 27.3 354,100 8.0 442,625 10.0 As of September 30, 2016 Tier 1 leverage ratio 1,234,912 10.9 452,339 4.0 565,424 5.0 CET1 capital ratio 1,234,912 28.5 195,080 4.5 281,783 6.5 Tier 1 capital ratio 1,234,912 28.5 260,107 6.0 346,809 8.0 Total capital ratio 1,243,452 28.7 346,809 8.0 433,512 10.0 Company As of September 30, 2017 Tier 1 leverage ratio 1,365,395 12.3 444,785 4.0 N/A N/A CET1 capital ratio 1,365,395 30.8 199,195 4.5 N/A N/A Tier 1 capital ratio 1,365,395 30.8 265,594 6.0 N/A N/A Total capital ratio 1,373,793 31.0 354,125 8.0 N/A N/A As of September 30, 2016 Tier 1 leverage ratio 1,387,049 12.3 452,248 4.0 N/A N/A CET1 capital ratio 1,387,049 32.0 195,094 4.5 N/A N/A Tier 1 capital ratio 1,387,049 32.0 260,126 6.0 N/A N/A Total capital ratio 1,395,589 32.2 346,835 8.0 N/A N/A

Fair Value Of Financial Instr36

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule Of Fair Value Assets Measured On A Recurring Basis	The following tables provide the level of valuation assumption used to determine the carrying value of the Company's financial instruments measured at fair value on a recurring basis at the dates presented. The Company did not have any liabilities that were measured at fair value at September 30, 2016. September 30, 2017 Quoted Prices Significant Significant in Active Markets Other Observable Unobservable Carrying for Identical Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets: AFS Securities: GSE debentures $ 270,729 $ — $ 270,729 $ — MBS 141,516 — 141,516 — Municipal bonds 1,535 — 1,535 — Trust preferred securities 2,051 — — 2,051 $ 415,831 $ — $ 413,780 $ 2,051 Liabilities: Interest Rate Swaps $ 598 $ — $ 598 $ — September 30, 2016 Quoted Prices Significant Significant in Active Markets Other Observable Unobservable Carrying for Identical Assets Inputs Inputs Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) Assets: AFS Securities: GSE debentures $ 347,038 $ — $ 347,038 $ — MBS 178,507 — 178,507 — Trust preferred securities 1,756 — — 1,756 $ 527,301 $ — $ 525,545 $ 1,756
Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments	The carrying amounts and estimated fair values of the Company's financial instruments, at the dates presented, were as follows: 2017 2016 Estimated Estimated Carrying Fair Carrying Fair Amount Value Amount Value (Dollars in thousands) Assets: Cash and cash equivalents $ 351,659 $ 351,659 $ 281,764 $ 281,764 AFS securities 415,831 415,831 527,301 527,301 HTM securities 827,738 833,009 1,100,874 1,122,867 Loans receivable 7,195,071 7,354,100 6,958,024 7,292,971 FHLB stock 100,954 100,954 109,970 109,970 Liabilities: Deposits 5,309,868 5,318,249 5,164,018 5,204,251 FHLB borrowings 2,173,808 2,182,841 2,372,389 2,434,151 Repurchase agreements 200,000 202,004 200,000 207,303 Interest rate swaps 598 598 — —

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in the components of AOCI, net of tax, for the year ended September 30, 2017 . During the years ended September 30, 2016 and 2015, the only changes in AOCI, net of tax, were related to unrealized gains (losses) on AFS securities and there were no amounts reclassified from AOCI. For the Year Ended September 30, 2017 Unrealized Unrealized Gains (Losses) Gains (Losses) on AFS on Cash Flow Total Securities Hedges AOCI (dollars in thousands) Balance at October 1, 2016 $ 5,915 $ — $ 5,915 Other comprehensive income (loss), before reclassifications (2,625 ) (506 ) (3,131 ) Amount reclassified from AOCI — 134 134 Other comprehensive income (loss) (2,625 ) (372 ) (2,997 ) Balance at September 30, 2017 $ 3,290 $ (372 ) $ 2,918

Selected Quarterly Financial 38

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2017
Selected Quarterly Financial Information [Abstract]
Summary Of Quarterly Data	The following table presents summarized quarterly data for each of the years indicated for the Company. First Second Third Fourth Quarter Quarter Quarter Quarter Total (Dollars and counts in thousands, except per share amounts) 2017 Total interest and dividend income $ 75,322 $ 77,660 $ 79,630 $ 80,574 $ 313,186 Net interest and dividend income 47,306 49,054 49,364 49,658 195,382 Provision for credit losses — — — — — Net income 20,578 21,587 21,370 20,602 84,137 Basic EPS 0.15 0.16 0.16 0.15 0.63 Diluted EPS 0.15 0.16 0.16 0.15 0.63 Dividends declared per share 0.375 0.085 0.335 0.085 0.88 Average number of basic shares outstanding 133,697 134,066 134,254 134,314 134,082 Average number of diluted shares outstanding 133,950 134,259 134,360 134,404 134,244 2016 Total interest and dividend income $ 74,359 $ 75,632 $ 75,527 $ 75,595 $ 301,113 Net interest and dividend income 47,982 48,538 47,930 47,732 192,182 Provision for credit losses — — — (750 ) (750 ) Net income 20,718 21,527 20,551 20,698 83,494 Basic EPS 0.16 0.16 0.15 0.16 0.63 Diluted EPS 0.16 0.16 0.15 0.16 0.63 Dividends declared per share 0.335 0.085 0.335 0.085 0.84 Average number of basic shares outstanding 132,822 132,960 133,102 133,296 133,045 Average number of diluted shares outstanding 132,911 133,031 133,251 133,493 133,176

Parent Company Financial Info39

Parent Company Financial Information (Parent Company Only) (Tables)	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule Of Balance Sheets	The Company's (parent company only) balance sheets at the dates presented, and the related statements of income and cash flows for each of the years presented are as follows: BALANCE SHEETS SEPTEMBER 30, 2017 and 2016 (Dollars in thousands, except per share amounts) 2017 2016 ASSETS: Cash and cash equivalents $ 120,785 $ 108,197 Investment in the Bank 1,204,781 1,240,827 Note receivable - ESOP 42,557 43,790 Other assets 365 389 TOTAL ASSETS $ 1,368,488 $ 1,393,203 LIABILITIES: Income taxes payable, net $ 88 $ 128 Accounts payable and accrued expenses 52 74 Deferred income tax liabilities, net 35 37 Total liabilities 175 239 STOCKHOLDERS' EQUITY: Preferred stock, $.01 par value; 100,000,000 shares authorized, no shares issued or outstanding — — Common stock, $.01 par value; 1,400,000,000 shares authorized, 138,223,835 and 137,486,172 shares issued and outstanding as of September 30, 2017 and 2016, respectively 1,382 1,375 Additional paid-in capital 1,167,368 1,156,855 Unearned compensation - ESOP (37,995 ) (39,647 ) Retained earnings 234,640 268,466 AOCI, net of tax 2,918 5,915 Total stockholders' equity 1,368,313 1,392,964 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 1,368,488 $ 1,393,203
Schedule Of Statements Of Income	STATEMENTS OF INCOME YEARS ENDED SEPTEMBER 30, 2017, 2016, and 2015 (Dollars in thousands) 2017 2016 2015 INTEREST AND DIVIDEND INCOME: Dividend income from the Bank $ 120,215 $ 117,513 $ 115,359 Interest income from other investments 1,715 1,725 1,835 Total interest and dividend income 121,930 119,238 117,194 NON-INTEREST EXPENSE: Salaries and employee benefits 896 827 835 Regulatory and outside services 247 261 243 Other non-interest expense 561 558 517 Total non-interest expense 1,704 1,646 1,595 INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 120,226 117,592 115,599 INCOME TAX EXPENSE 4 28 84 INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 120,222 117,564 115,515 EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY (36,085 ) (34,070 ) (37,422 ) NET INCOME $ 84,137 $ 83,494 $ 78,093
Schedule Of Statements Of Cash Flows	STATEMENTS OF CASH FLOWS YEARS ENDED SEPTEMBER 30, 2017, 2016, and 2015 (Dollars in thousands) 2017 2016 2015 CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 84,137 $ 83,494 $ 78,093 Adjustments to reconcile net income to net cash provided by operating activities: Equity in excess of distribution over earnings of subsidiary 36,085 34,070 37,422 Depreciation of equipment 29 30 30 Provision for deferred income taxes (2 ) 2 428 Changes in: Other assets (5 ) 1 35 Income taxes receivable/payable (40 ) 445 3,300 Accounts payable and accrued expenses (22 ) 14 1 Net cash flows provided by operating activities 120,182 118,056 119,309 CASH FLOWS FROM INVESTING ACTIVITIES: Principal collected on notes receivable from ESOP 1,233 1,194 1,156 Net cash flows provided by investing activities 1,233 1,194 1,156 CASH FLOWS FROM FINANCING ACTIVITIES: Net payment from subsidiary related to restricted stock awards 293 473 95 Dividends paid (117,963 ) (111,767 ) (114,162 ) Repurchase of common stock — — (50,034 ) Stock options exercised 8,843 4,070 267 Net cash flows used in financing activities (108,827 ) (107,224 ) (163,834 ) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 12,588 12,026 (43,369 ) CASH AND CASH EQUIVALENTS: Beginning of year 108,197 96,171 139,540 End of year $ 120,785 $ 108,197 $ 96,171

Summary Of Significant Accoun40

Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Summary Of Significant Accounting Policies [Line Items]
Interest-bearing deposits held at the Federal Reserve Bank	$ 337.5	$ 264.4
Average daily balance of required reserves at the Federal Reserve Bank	$ 9.1	$ 8.8
Traditional Banking Offices [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of Stores	37
In-Store Banking Offices [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of Stores	10
Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	39 years
Structural Building Components [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	15 years
Maximum [Member] | Furniture, Fixtures And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	7 years
Maximum [Member] | Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	15 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period of service required for ESOP eligibility	1 year
Employee age required for ESOP eligibility, years	21
Number of hours required for ESOP eligibility	1,000
Minimum [Member] | Furniture, Fixtures And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	3 years
Minimum [Member] | Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life, years	3 years

Earnings Per Share (Details)

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
Net income	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 20,698	$ 20,551	$ 21,527	$ 20,718	$ 84,137	$ 83,494	$ 78,093
Income allocated to participating securities									(44)	(66)	(116)
Net income available to common stockholders									$ 84,093	$ 83,428	$ 77,977
Total basic average common shares outstanding	134,314,000	134,254,000	134,066,000	133,697,000	133,296,000	133,102,000	132,960,000	132,822,000	134,082,420	133,045,215	135,383,693
Effect of dilutive stock options									161,442	131,161	24,810
Total diluted average common shares outstanding	134,404,000	134,360,000	134,259,000	133,950,000	133,493,000	133,251,000	133,031,000	132,911,000	134,243,862	133,176,376	135,408,503
Net EPS:
Basic	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.16	$ 0.15	$ 0.16	$ 0.16	$ 0.63	$ 0.63	$ 0.58
Diluted	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.16	$ 0.15	$ 0.16	$ 0.16	$ 0.63	$ 0.63	$ 0.58
Antidilutive stock options, excluded from the diluted average common shares outstanding calculation									200,800	886,417	1,248,744
Average Common Shares Outstanding [Member]
Earnings Per Share
Total basic average common shares outstanding									134,019,962	132,982,815	135,321,235
Average Committed ESOP Shares Outstanding [Member]
Earnings Per Share
Total basic average common shares outstanding									62,458	62,400	62,458

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Marketable Securities [Abstract]
Other than temporary impairments, amount	$ 0	$ 0

Securities (Amortized Cost, Est

Securities (Amortized Cost, Estimated Fair Value, and Gross Unrealized Gains and Losses of AFS and HTM Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 827,738	$ 1,100,874
Held-to-maturity Securities, Gross Unrealized Gains	10,579	23,219
Held-to-maturity Securities, Gross Unrealized Losses	5,308	1,226
Held-to-maturity securities, Estimated Fair Value	833,009	1,122,867
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	410,541	517,791
Available-for-sale Securities, Gross Unrealized Gains	5,944	9,884
Available-for-sale Securities, Gross Unrealized Losses	654	374
Available-for-sale Securities, Estimated Fair Value	415,831	527,301
GSE Debentures [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	271,300	346,226
Available-for-sale Securities, Gross Unrealized Gains	16	815
Available-for-sale Securities, Gross Unrealized Losses	587	3
Available-for-sale Securities, Estimated Fair Value	270,729	347,038
MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	800,931	1,067,571
Held-to-maturity Securities, Gross Unrealized Gains	10,460	22,862
Held-to-maturity Securities, Gross Unrealized Losses	5,295	1,219
Held-to-maturity securities, Estimated Fair Value	806,096	1,089,214
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	135,644	169,442
Available-for-sale Securities, Gross Unrealized Gains	5,923	9,069
Available-for-sale Securities, Gross Unrealized Losses	51	4
Available-for-sale Securities, Estimated Fair Value	141,516	178,507
Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	2,067	2,123
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	16	367
Available-for-sale Securities, Estimated Fair Value	2,051	1,756
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	26,807	33,303
Held-to-maturity Securities, Gross Unrealized Gains	119	357
Held-to-maturity Securities, Gross Unrealized Losses	13	7
Held-to-maturity securities, Estimated Fair Value	26,913	$ 33,653
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,530
Available-for-sale Securities, Gross Unrealized Gains	5
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Estimated Fair Value	$ 1,535

Securities (Schedule Of Estimat

Securities (Schedule Of Estimated Fair Value And Gross Unrealized Losses Of Securities In Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	$ 234,069	$ 24,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	585	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	27,676	2,410
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	69	371
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	264,838	152,701
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	1,590	544
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	202,554	67,037
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	3,718	682
GSE Debentures [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	224,421	24,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	539	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	24,952	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	48	0
Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	2,051	1,756
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	16	367
MBS [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	9,648	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	46	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	673	654
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	5	4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	259,200	147,930
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	1,582	538
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	201,094	66,646
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	3,713	681
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	5,638	4,771
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	8	6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	1,460	391
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	$ 5	$ 1

Securities (Schedule Of Contrac

Securities (Schedule Of Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	$ 410,541	$ 517,791
Available-for-sale Securities, Amortized Cost	410,541	517,791
Available-for-sale Securities, Estimated Fair Value	415,831	527,301
Available-for-sale Securities, Estimated Fair Value	415,831	527,301
Held-to-maturity Securities, Amortized Cost	827,738	1,100,874
Held-to-maturity Securities, Amortized Cost	827,738	1,100,874
Held-to-maturity Securities, Estimated Fair Value	833,009	1,122,867
Held-to-maturity securities, Estimated Fair Value	833,009	1,122,867
Debt Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, One year or less, Amortized Cost	121,340
Available-for-sale Securities, One year through five years, Amortized Cost	151,490
Available-for-sale Securities, Five years through ten years, Amortized Cost	0
Available-for-sale Securities, Ten years and thereafter, Amortized Cost	2,067
Available-for-sale Securities, Amortized Cost	274,897
Available-for-sale Securities, Amortized Cost	274,897
Available-for-sale Securities, One year or less, Estimated Fair Value	121,253
Available-for-sale Securities, One year through five years, Estimated Fair Value	151,011
Available-for-sale Securities, Five years through ten years, Estimated Fair Value	0
Available-for-sale Securities, Ten years and thereafter, Estimated Fair Value	2,051
Available-for-sale Securities, Estimated Fair Value	274,315
Available-for-sale Securities, Estimated Fair Value	274,315
Held-to-maturity Securities, One year or less, Amortized Cost	6,141
Held-to-maturity Securities, One year through five years, Amortized Cost	20,448
Held-to-maturity Securities, Five years through ten years, Amortized Cost	218
Held-to-maturity Securities, Ten years and thereafter, Amortized Cost	0
Held-to-maturity Securities, Amortized Cost	26,807
Held-to-maturity Securities, Amortized Cost	26,807
Held-to-maturity Securities, One year or less, Estimated Fair Value	6,156
Held-to-maturity Securities, One year through five years, Estimated Fair Value	20,534
Held-to-maturity Securities, Five years through ten years, Estimated Fair Value	223
Held-to-maturity Securities, Ten years and thereafter, Estimated Fair Value	0
Held-to-maturity Securities, Estimated Fair Value	26,913
Held-to-maturity securities, Estimated Fair Value	26,913
MBS [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	135,644	169,442
Available-for-sale Securities, Amortized Cost	135,644	169,442
Available-for-sale Securities, Estimated Fair Value	141,516	178,507
Available-for-sale Securities, Estimated Fair Value	141,516	178,507
Held-to-maturity Securities, Amortized Cost	800,931	1,067,571
Held-to-maturity Securities, Amortized Cost	800,931	1,067,571
Held-to-maturity Securities, Estimated Fair Value	806,096	1,089,214
Held-to-maturity securities, Estimated Fair Value	$ 806,096	$ 1,089,214

Securities (Schedule Of Taxable

Securities (Schedule Of Taxable And Non-taxable Components Of Interest Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Marketable Securities [Abstract]
Taxable	$ 3,847	$ 5,255	$ 6,431
Non-taxable	515	670	751
Interest income on investment securities	$ 4,362	$ 5,925	$ 7,182

Securities (Schedule Of Carryin

Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Marketable Securities [Abstract]
Public unit deposits	$ 499,993	$ 419,282
Repurchase agreements	214,298	217,374
FRB of Kansas City	11,769	15,938
Total securities pledged as collateral	$ 726,060	$ 652,594

Loans Receivable And Allowanc48

Loans Receivable And Allowance For Credit Losses (Narrative) (Details) $ in Thousands	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Loans Receivable [Line Items]
Serviced loans for others, aggregate amount	$ 101,200	$ 120,000
Escrow balances on loans serviced for others	$ 2,100	2,400
Loan-to-value ratio securing commercial real estate loans, maximum	80.00%
Debt service coverage ratio for commercial real estate loans, minimum	1.25
Recorded investment of loans in process of foreclosure	$ 4,300	5,700
Carrying value of residential OREO	1,400	2,500
Loans receivable	7,195,071	6,958,024
ACL maintained for individually evaluated impaired loans	0	0
Doubtful [Member]
Loans Receivable [Line Items]
Loans receivable	$ 0	$ 0

Loans Receivable And Allowanc49

Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Loans Receivable [Line Items]
Loans receivable, gross	$ 7,182,751	$ 6,949,522
Total real estate loans	7,056,877	6,821,913
ACL	8,398	8,540
Discounts/unearned loan fees	24,962	24,933
Premiums/deferred costs	(45,680)	(41,975)
Loans receivable, net	7,195,071	6,958,024
One- to Four-Family Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	6,786,895	6,667,770
One- to Four-Family Segment [Member] | Originated [Member]
Loans Receivable [Line Items]
Loans receivable, gross	3,959,232	4,005,615
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Loans Receivable [Line Items]
Loans receivable, gross	2,445,311	2,206,072
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Loans Receivable [Line Items]
Loans receivable, gross	351,705	416,653
One- to Four-Family Segment [Member] | Construction [Member]
Loans Receivable [Line Items]
Loans receivable, gross	30,647	39,430
Commercial Real Estate Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	269,982	154,143
Commercial Real Estate Segment [Member] | Construction [Member]
Loans Receivable [Line Items]
Loans receivable, gross	86,952	43,375
Commercial Real Estate Segment [Member] | Permanent [Member]
Loans Receivable [Line Items]
Loans receivable, gross	183,030	110,768
Consumer Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	125,874	127,609
Consumer Segment [Member] | Home Equity [Member]
Loans Receivable [Line Items]
Loans receivable, gross	122,066	123,345
Consumer Segment [Member] | Other [Member]
Loans Receivable [Line Items]
Loans receivable, gross	$ 3,808	$ 4,264

Loans Receivable And Allowanc50

Loans Receivable And Allowance For Credit Losses (Recorded Investment in Loans, Past Due) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	$ 28,205	$ 39,767
Financing receivable, current loans	7,175,264	6,926,797
Financing receivable, total recorded investment	7,203,469	6,966,564
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	18,804	22,713
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	9,401	17,054
One- to Four-Family Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total recorded investment	6,808,616	6,685,873
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	18,716	21,698
Financing receivable, current loans	3,956,598	4,007,012
Financing receivable, total recorded investment	3,975,314	4,028,710
One- to Four-Family Segment [Member] | Originated [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	13,216	13,545
One- to Four-Family Segment [Member] | Originated [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	5,500	8,153
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	1,947	4,381
Financing receivable, current loans	2,477,916	2,233,941
Financing receivable, total recorded investment	2,479,863	2,238,322
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	1,855	3,389
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	92	992
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	6,632	12,462
Financing receivable, current loans	346,807	406,379
Financing receivable, total recorded investment	353,439	418,841
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	3,233	5,082
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	3,399	7,380
Commercial Real Estate Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	0	0
Financing receivable, current loans	268,979	153,082
Financing receivable, total recorded investment	268,979	153,082
Commercial Real Estate Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	0	0
Commercial Real Estate Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	0	0
Consumer Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total recorded investment	125,874	127,609
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	873	1,155
Financing receivable, current loans	121,193	122,190
Financing receivable, total recorded investment	122,066	123,345
Consumer Segment [Member] | Home Equity [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	467	635
Consumer Segment [Member] | Home Equity [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	406	520
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	37	71
Financing receivable, current loans	3,771	4,193
Financing receivable, total recorded investment	3,808	4,264
Consumer Segment [Member] | Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	33	62
Consumer Segment [Member] | Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	$ 4	$ 9

Loans Receivable And Allowanc51

Loans Receivable And Allowance For Credit Losses (Recorded Investment in Loans, Nonaccrual) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 16,645	$ 29,143
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	10,054	17,086
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	1,804	3,788
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	4,264	7,411
Commercial Real Estate Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	0	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	519	848
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 4	$ 10

Loans Receivable And Allowanc52

Loans Receivable And Allowance For Credit Losses (Recorded Investment In Classified Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	$ 7,203,469	$ 6,966,564
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	7,301	13,956
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	42,900	45,913
One- to Four-Family Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	6,808,616	6,685,873
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	3,975,314	4,028,710
One- to Four-Family Segment [Member] | Originated [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	7,031	10,242
One- to Four-Family Segment [Member] | Originated [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	30,059	27,818
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	2,479,863	2,238,322
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	261	2,496
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	3,800	5,168
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	353,439	418,841
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	1,156
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	8,005	11,480
Commercial Real Estate Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	268,979	153,082
Commercial Real Estate Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	0
Commercial Real Estate Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	0
Consumer Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	125,874	127,609
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	122,066	123,345
Consumer Segment [Member] | Home Equity [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	9	54
Consumer Segment [Member] | Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	1,032	1,431
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	3,808	4,264
Consumer Segment [Member] | Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	8
Consumer Segment [Member] | Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	$ 4	$ 16

Loans Receivable And Allowanc53

Loans Receivable And Allowance For Credit Losses (LTV And Credit Score Information For Originated, Correspondent Purchased, And Bulk Purchased One-To Four-Family Loans And Originated Consumer Home Equity Loans) (Details)	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	765	764
Weighted average LTV	64.00%	64.00%
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	767	766
Weighted average LTV	63.00%	63.00%
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	764	764
Weighted average LTV	68.00%	68.00%
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	757	753
Weighted average LTV	63.00%	64.00%
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	755	755
Weighted average LTV	19.00%	20.00%

Loans Receivable And Allowanc54

Loans Receivable And Allowance For Credit Losses (Troubled Debt Restructurings On Financing Receivables) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Financing Receivable, Modifications [Line Items]
Number of Contracts	144	157	172
Pre-Restructured Outstanding	$ 15,782	$ 20,824	$ 19,442
Post-Restructured Outstanding	$ 16,289	$ 21,211	$ 19,651
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	112	122	141
Pre-Restructured Outstanding	$ 11,940	$ 17,201	$ 17,265
Post-Restructured Outstanding	$ 12,402	$ 17,557	$ 17,468
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	12	12	2
Pre-Restructured Outstanding	$ 2,443	$ 2,592	$ 546
Post-Restructured Outstanding	$ 2,459	$ 2,619	$ 542
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	3	4
Pre-Restructured Outstanding	$ 1,031	$ 596	$ 1,140
Post-Restructured Outstanding	$ 1,048	$ 594	$ 1,144
Commercial Real Estate Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Pre-Restructured Outstanding	$ 0	$ 0	$ 0
Post-Restructured Outstanding	$ 0	$ 0	$ 0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	17	19	22
Pre-Restructured Outstanding	$ 368	$ 427	$ 479
Post-Restructured Outstanding	$ 380	$ 433	$ 485
Consumer Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	1	3
Pre-Restructured Outstanding	$ 0	$ 8	$ 12
Post-Restructured Outstanding	$ 0	$ 8	$ 12

Loans Receivable And Allowanc55

Loans Receivable And Allowance For Credit Losses (Troubled Debt Restructurings On Financing Receivables That Subsequently Defaulted) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Financing Receivable, Modifications [Line Items]
Number of Contracts	66	57	61
Recorded Investment	$ 5,847	$ 6,052	$ 6,671
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	46	48	49
Recorded Investment	$ 4,561	$ 5,330	$ 5,311
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	3	3
Recorded Investment	$ 148	$ 548	$ 432
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	0	4
Recorded Investment	$ 698	$ 0	$ 890
Commercial Real Estate Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	0
Recorded Investment	$ 0	$ 0	$ 0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	16	6	4
Recorded Investment	$ 440	$ 174	$ 33
Consumer Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	1
Recorded Investment	$ 0	$ 0	$ 5

Loans Receivable And Allowanc56

Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Instant Related Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	$ 42,229	$ 37,954
Recorded Investment, Allowance Recorded	0	18,296
Recorded Investment	42,229	56,250
Unpaid Principal Balance, No Related Allowance	44,351	40,546
Unpaid Principal Balance, Allowance Recorded	0	18,321
Unpaid Principal Balance	44,351	58,867
Related ACL	0	217
With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	217
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	30,251	22,982
Recorded Investment, Allowance Recorded	0	13,430
Recorded Investment	30,251	36,412
Unpaid Principal Balance, No Related Allowance	30,953	23,640
Unpaid Principal Balance, Allowance Recorded	0	13,476
Unpaid Principal Balance	30,953	37,116
Related ACL	0	125
One- to Four-Family Segment [Member] | Originated [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
One- to Four-Family Segment [Member] | Originated [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	125
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	3,800	2,963
Recorded Investment, Allowance Recorded	0	2,662
Recorded Investment	3,800	5,625
Unpaid Principal Balance, No Related Allowance	3,771	2,950
Unpaid Principal Balance, Allowance Recorded	0	2,664
Unpaid Principal Balance	3,771	5,614
Related ACL	0	4
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	4
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	7,403	10,985
Recorded Investment, Allowance Recorded	0	1,650
Recorded Investment	7,403	12,635
Unpaid Principal Balance, No Related Allowance	8,606	12,684
Unpaid Principal Balance, Allowance Recorded	0	1,627
Unpaid Principal Balance	8,606	14,311
Related ACL	0	49
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	49
Commercial Real Estate Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	0	0
Recorded Investment, Allowance Recorded	0	0
Recorded Investment	0	0
Unpaid Principal Balance, No Related Allowance	0	0
Unpaid Principal Balance, Allowance Recorded	0	0
Unpaid Principal Balance	0	0
Related ACL	0	0
Commercial Real Estate Segment [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
Commercial Real Estate Segment [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	775	1,014
Recorded Investment, Allowance Recorded	0	548
Recorded Investment	775	1,562
Unpaid Principal Balance, No Related Allowance	997	1,230
Unpaid Principal Balance, Allowance Recorded	0	548
Unpaid Principal Balance	997	1,778
Related ACL	0	38
Consumer Segment [Member] | Home Equity [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
Consumer Segment [Member] | Home Equity [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	38
Consumer Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, No Related Allowance	0	10
Recorded Investment, Allowance Recorded	0	6
Recorded Investment	0	16
Unpaid Principal Balance, No Related Allowance	24	42
Unpaid Principal Balance, Allowance Recorded	0	6
Unpaid Principal Balance	24	48
Related ACL	0	1
Consumer Segment [Member] | Other [Member] | With no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	0	0
Consumer Segment [Member] | Other [Member] | With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Related ACL	$ 0	$ 1

Loans Receivable And Allowanc57

Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Duration Related Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	$ 38,315	$ 24,221	$ 23,865
Average Recorded Investment, Allowance Recorded	15,114	29,995	30,994
Average Recorded Investment	53,429	54,216	54,859
Interest Income Recognized, No Related Allowance	1,315	778	686
Interest Income Recognized, Allowance Recorded	556	1,125	1,155
Interest Income Recognized	1,871	1,903	1,841
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	24,122	12,063	11,744
Average Recorded Investment, Allowance Recorded	11,469	24,199	25,465
Average Recorded Investment	35,591	36,262	37,209
Interest Income Recognized, No Related Allowance	917	470	451
Interest Income Recognized, Allowance Recorded	434	983	1,026
Interest Income Recognized	1,351	1,453	1,477
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	3,346	495	471
Average Recorded Investment, Allowance Recorded	2,018	2,669	1,759
Average Recorded Investment	5,364	3,164	2,230
Interest Income Recognized, No Related Allowance	118	18	10
Interest Income Recognized, Allowance Recorded	65	50	53
Interest Income Recognized	183	68	63
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	9,852	11,022	11,153
Average Recorded Investment, Allowance Recorded	1,160	2,219	2,960
Average Recorded Investment	11,012	13,241	14,113
Interest Income Recognized, No Related Allowance	194	196	196
Interest Income Recognized, Allowance Recorded	20	27	40
Interest Income Recognized	214	223	236
Commercial Real Estate Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	0	0	0
Average Recorded Investment, Allowance Recorded	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized, No Related Allowance	0	0	0
Interest Income Recognized, Allowance Recorded	0	0	0
Interest Income Recognized	0	0	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	988	628	485
Average Recorded Investment, Allowance Recorded	457	895	795
Average Recorded Investment	1,445	1,523	1,280
Interest Income Recognized, No Related Allowance	86	93	29
Interest Income Recognized, Allowance Recorded	36	64	34
Interest Income Recognized	122	157	63
Consumer Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	7	13	12
Average Recorded Investment, Allowance Recorded	10	13	15
Average Recorded Investment	17	26	27
Interest Income Recognized, No Related Allowance	0	1	0
Interest Income Recognized, Allowance Recorded	1	1	2
Interest Income Recognized	$ 1	$ 2	$ 2

Loans Receivable And Allowanc58

Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 8,540	$ 9,443	$ 9,227
Charge-offs	(348)	(630)	(735)
Recoveries	206	477	180
Provision for credit losses	0	(750)	771
Ending Balance	8,398	8,540	9,443
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,095	8,414	8,586
Charge-offs	(288)	(542)	(663)
Recoveries	169	451	114
Provision for credit losses	(881)	(1,228)	377
Ending Balance	6,095	7,095	8,414
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,928	4,865	4,460
Charge-offs	(72)	(200)	(424)
Recoveries	4	77	56
Provision for credit losses	(687)	(814)	773
Ending Balance	3,173	3,928	4,865
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,102	2,115	1,803
Charge-offs	0	0	(11)
Recoveries	0	0	0
Provision for credit losses	(180)	(13)	323
Ending Balance	1,922	2,102	2,115
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,065	1,434	2,323
Charge-offs	(216)	(342)	(228)
Recoveries	165	374	58
Provision for credit losses	(14)	(401)	(719)
Ending Balance	1,000	1,065	1,434
Commercial Real Estate Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,208	742	400
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for credit losses	904	466	342
Ending Balance	2,112	1,208	742
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	237	287	241
Charge-offs	(60)	(88)	(72)
Recoveries	37	26	66
Provision for credit losses	(23)	12	52
Ending Balance	$ 191	$ 237	$ 287

Loans Receivable And Allowanc59

Loans Receivable And Allowance For Credit Losses (Summary Of Loan Portfolio Segment Disaggregated By The Company's Impairment Method) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	$ 7,161,240	$ 6,924,516
Recorded investment in loans individually evaluated for impairment	42,229	42,048
Financing receivable, total recorded investment	7,203,469	6,966,564
ACL for loans collectively evaluated for impairment	8,398	8,540
One- to Four-Family Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	6,767,161	6,644,930
Recorded investment in loans individually evaluated for impairment	41,455	40,943
Financing receivable, total recorded investment	6,808,616	6,685,873
ACL for loans collectively evaluated for impairment	6,095	7,095
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	3,945,063	4,003,750
Recorded investment in loans individually evaluated for impairment	30,251	24,960
Financing receivable, total recorded investment	3,975,314	4,028,710
ACL for loans collectively evaluated for impairment	3,173	3,928
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	2,476,063	2,233,347
Recorded investment in loans individually evaluated for impairment	3,800	4,975
Financing receivable, total recorded investment	2,479,863	2,238,322
ACL for loans collectively evaluated for impairment	1,922	2,102
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	346,035	407,833
Recorded investment in loans individually evaluated for impairment	7,404	11,008
Financing receivable, total recorded investment	353,439	418,841
ACL for loans collectively evaluated for impairment	1,000	1,065
Commercial Real Estate Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	268,979	153,082
Recorded investment in loans individually evaluated for impairment	0	0
Financing receivable, total recorded investment	268,979	153,082
ACL for loans collectively evaluated for impairment	2,112	1,208
Consumer Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	125,100	126,504
Recorded investment in loans individually evaluated for impairment	774	1,105
Financing receivable, total recorded investment	125,874	127,609
ACL for loans collectively evaluated for impairment	$ 191	$ 237

Premises And Equipment (Narrati

Premises And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment, Net [Abstract]
Rental expense	$ 1.1	$ 1.2	$ 1.1

Premises And Equipment (Summary

Premises And Equipment (Summary Of The Carrying Value Of Banking Premises And Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 151,481	$ 145,355
Accumulated depreciation, property, plant and equipment	66,663	62,134
Property, plant and equipment, net	84,818	83,221
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,670	11,065
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	96,401	91,700
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 43,410	$ 42,590

Premises And Equipment (Schedul

Premises And Equipment (Schedule Of Future Minimum Rental Commitments) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Property, Plant and Equipment, Net [Abstract]
2,018	$ 1,170
2,019	1,057
2,020	813
2,021	703
2,022	623
Thereafter	1,906
Future minimum rental commitments, total	$ 6,272

Low Income Housing Partnershi63

Low Income Housing Partnerships (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Investments in Affordable Housing Projects [Abstract]
Investment In affordable housing limited partnerships	$ 66,100	$ 58,000
Obligations related to investments in affordable housing limited partnerships	$ 29,400	27,200
Affordable housing tax credits commitment, year to be paid	2,020
Proportional amortization expense, amount	$ 4,400
Affordable housing tax credits, amount	6,900	6,000	$ 5,300
Net income tax benefit, low income housing partnerships	2,500
Impairment losses from the forfeiture or ineligibility of tax credits or other circumstances, amount	$ 0	$ 0	$ 0

Deposits and Borrowed Funds (Na

Deposits and Borrowed Funds (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2015	Sep. 30, 2016
Noninterest-bearing deposits	$ 243,700		$ 217,000
Time Deposits, $250,000 or more	676,100		576,400
FHLB borrowings, outstanding balance	2,173,808		2,372,389
FHLB Advances, Fixed Rate	1,980,000		2,372,389
FHLB Advances, Variable Rate	200,000
FHLB line of credit, outstanding balance	$ 0		0
Expiration date for FHLB line of credit	Nov. 16, 2018
FHLB advance prepayment penalty	$ 1,192		2,611
Interest rate swaps, notional amount	$ 200,000
Interest rate swaps, remaining term to maturity	5 years 10 months 12 days
Interest rate swaps, fair value	$ (598)
Interest rate swaps, amount reclassified from AOCI	134
Interest rate swaps, future amount to be reclassified from AOCI	1,100
Interest rate swaps, amount of hedge ineffectiveness recognized	0
Interest rate swaps, collateral posted	$ 731
FHLB borrowings threshold percentage of regulatory assets	40.00%
FHLB borrowings threshold percentage of regulatory assets, temporary increase	55.00%
FHLB percentage of regulatory assets	24.00%
Repurchase agreements	$ 200,000		$ 200,000
Weighted average rate of repurchase agreements	2.94%		2.94%
Repurchase Agreements, Description of Potential Risks	See Note 3 for information regarding the amount of securities pledged as collateral in conjunction with repurchase agreements. Securities are delivered to the party with whom each transaction is executed and the party agrees to resell the same securities to the Bank at the maturity of the agreement. The Bank retains the right to substitute similar or like securities throughout the terms of the agreements. The repurchase agreements and collateral are subject to valuation at current market levels and the Bank may ask for the return of excess collateral or be required to post additional collateral due to changes in the market values of these items. The Bank may also be required to post additional collateral as a result of principal payments received on the securities pledged.
Prepayments Of FHLB Advances [Member]
Prepayments of fixed-rate FHLB advances		$ 325,000
Weighted average remaining term to maturity in months		4 months
FHLB advance prepayment penalty		$ 3,400
Prepayments Of FHLB Advances [Member] | Weighted Average [Member]
Weighted average interest rate of FHLB advances		2.61%
New Borrowings [Member]
New fixed-rate FHLB advances		$ 325,000
Weighted average remaining term to maturity in months		53 months
Basis point impact of FHLB prepayment penalty		42
New Borrowings [Member] | Weighted Average [Member]
Weighted average interest rate of FHLB advances		1.66%
FHLB Advances [Member]
FHLB borrowings, outstanding balance	$ 2,173,808		$ 2,372,389
Leverage Strategy [Member]
FHLB line of credit available for leverage strategy, maximum	$ 2,100,000

Deposits and Borrowed Funds (FH

Deposits and Borrowed Funds (FHLB Advances) (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Sep. 30, 2016
Debt [Line Items]
FHLB advances		$ 2,175,000	$ 2,375,000
Deferred prepayment penalty		(1,192)	(2,611)
FHLB advances, outstanding balance		$ 2,173,808	$ 2,372,389
Weighted Average [Member]
Debt [Line Items]
Weighted average contractual interest rate on FHLB advances		1.96%	2.17%
Weighted average effective interest rate on FHLB advances	[1]	2.09%	2.24%
FHLB Advances [Member]
Debt [Line Items]
FHLB advances, outstanding balance		$ 2,173,808	$ 2,372,389
[1]	The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the variable-rate FHLB advances.

Deposits and Borrowed Funds (Ma

Deposits and Borrowed Funds (Maturity Of Borrowed Funds and Certificates of Deposit) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deposits and Borrowed Funds [Abstract]
FHLB Advances Due in 2018	$ 475,000
FHLB Advances Due in 2019	500,000
FHLB Advances Due in 2020	350,000
FHLB Advances Due in 2021	550,000
FHLB Advances Due in 2022	200,000
FHLB Advances Due Thereafter	100,000
FHLB Advances Amount	2,175,000	$ 2,375,000
Repurchase Agreements Due in 2018	100,000
Repurchase Agreements Due in 2019	0
Repurchase Agreements Due in 2020	100,000
Repurchase Agreements Due in 2021	0
Repurchase Agreements Due in 2022	0
Repurchase Agreements Due Thereafter	0
Repurchase Agreements Amount	200,000
Certificates of Deposit Due in 2018	1,116,415
Certificates of Deposit Due in 2019	748,537
Certificates of Deposit Due in 2020	591,966
Certificates of Deposit Due in 2021	274,805
Certificates of Deposit Due in 2022	177,308
Certificates of Deposit Due Thereafter	1,390
Certificates of Deposit Amount	$ 2,910,421

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	34.20%	31.50%	32.50%
Valuation allowance	$ 1,795,000	$ 1,804,000
Unrecognized tax benefits	$ 0	$ 0

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Current, Federal	$ 38,127	$ 33,298	$ 30,079
Current, State	4,734	4,677	4,395
Current income tax expense	42,861	37,975	34,474
Deferred, Federal	712	286	2,869
Deferred, State	210	184	332
Deferred income tax expense	922	470	3,201
Income tax expense	$ 43,783	$ 38,445	$ 37,675

Income Taxes (Differences Betwe

Income Taxes (Differences Between Effective Rates And Statutory Federal Income Tax Rate Computed On Income Before Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal income tax expense computed at statutory Federal rate, Amount	$ 44,772	$ 42,679	$ 40,519
Federal income tax expense computed at statutory Federal rate, Percentage	35.00%	35.00%	35.00%
Increases (Decreases) In Taxes Resulting From:
State taxes, net of Federal tax effect, Amount	$ 3,452	$ 3,308	$ 3,257
State taxes, net of Federal tax effect, Percentage	2.70%	2.70%	2.80%
Low income housing tax credits, presented net of proportional amortization in 2017, Amount	$ (2,468)	$ (4,815)	$ (4,316)
Low income housing tax credits, presented net of proportional amortization in 2017, Percentage	(2.00%)	(4.00%)	(3.70%)
ESOP related expenses, net, Amount	$ (1,052)	$ (1,127)	$ (1,222)
ESOP related expenses, net, Percentage	(0.80%)	(0.90%)	(1.10%)
Other, Amount	$ (921)	$ (1,600)	$ (563)
Other, Percentage	(0.70%)	(1.30%)	(0.50%)
Income tax expense	$ 43,783	$ 38,445	$ 37,675
Income tax expense, Percentage	34.20%	31.50%	32.50%

Income Taxes (Deferred Income T

Income Taxes (Deferred Income Tax Expense Results From Temporary Differences In Recognition Of Revenue And Expenses For Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Salaries, deferred compensation and employee benefits	$ 437	$ (143)	$ (12)
Low income housing partnerships	285	(318)	(763)
ACL	185	480	(75)
Premises and equipment	14	1,593	(129)
FHLB stock dividends	4	(1,357)	4,083
Capitol Federal Foundation contribution	0	0	418
Other, net	(3)	215	(321)
Deferred income tax expense	$ 922	$ 470	$ 3,201

Income Taxes (Components Of Net

Income Taxes (Components Of Net Deferred Income Tax (Liabilities) Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deferred income tax assets:
Salaries, deferred compensation and employee benefits	$ 2,583	$ 3,020
Low income housing partnerships	1,478	1,763
ESOP compensation	1,724	1,566
ACL	711	896
Other	2,621	2,528
Gross deferred income tax assets	9,117	9,773
Valuation allowance	(1,795)	(1,804)
Gross deferred income tax asset, net of valuation allowance	7,322	7,969
Deferred income tax liabilities:
FHLB stock dividends	23,242	23,238
Premises and equipment	6,105	6,091
Unrealized gain on AFS securities	2,000	3,595
Other	433	419
Gross deferred income tax liabilities	31,780	33,343
Net deferred tax liabilities	$ 24,458	$ 25,374

Employee Stock Ownership Plan72

Employee Stock Ownership Plan (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017USD ($)shares	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2018shares
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Held In Employee Stock Ownership Plan, Allocated	165,198
Compensation expense related to the ESOP including dividends | $	$ 3,300	$ 3,000	$ 3,000
Portion of compensation expense related to the ESOP attributable to changes in Company stock price | $	784	522	384
Dividends on unallocated ESOP shares in excess of debt service payments | $	$ 833	$ 813	$ 952
Forecast [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Held In Employee Stock Ownership Plan, Committed-to-be-Released				165,198
Minimum [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Percentage of ESOP shares participant may diversify once age requirement is met	25.00%
Required age of participant in order to diversify ESOP shares, years	50
IPO [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares acquired by ESOP trust	3,024,574
Number of shares acquired by ESOP post corporate reorganization	6,846,728
ESOP loan maturity date	Sep. 30, 2013
Corporate Reorganization [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares acquired by ESOP trust	4,726,000
ESOP loan maturity date	Sep. 30, 2040

Employee Stock Ownership Plan73

Employee Stock Ownership Plan (Summary Of Shares Held In The ESOP Trust) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated ESOP shares	4,369,840	4,392,371
Unreleased ESOP shares	3,799,554	3,964,752
Total ESOP shares	8,169,394	8,357,123
Fair value of unreleased ESOP shares	$ 55,853	$ 55,784

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding at end of year, number of options	1,236,798
Options outstanding at end of year, weighted average exercise price	$ 13.31
Options outstanding at end of year, weighted average remaining contractual life (in years)	5 years 3 months 15 days
Options exercisable at end of year, number of options	1,144,798
Options exercisable at end of year, weighted average exercise price	$ 13.38
Options exercisable at end of year, weighted average remaining contractual life (in years)	5 years 1 month 2 days
Unvested restricted stock at end of year, number of shares	56,600
Unvested restricted stock at end of year, weighted average grant date fair value	$ 13.38
Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 118	$ 335	$ 618
Fair value of stock options vested during the period	174	652	615
Unrecognized total future compensation cost, net of forfeitures	$ 128
Unrecognized total future compensation cost weighted average recognition period	1 year 11 months 19 days
Stock Option Plans [Member] | 2000 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding at end of year, number of options	508,719
Stock Option Plans [Member] | 2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance	5,907,500
Plan expiration date	Jan. 24, 2027
Number of shares available for future grants	4,184,316
Stock Option Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options	3 years
Stock Option Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options	5 years
Restricted Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 388	787	1,500
Unrecognized total future compensation cost	635
Fair value of restricted stock vested during the period	$ 563	$ 1,600	$ 1,500
Unrecognized total future compensation cost weighted average recognition period	2 years 8 months 12 days
Restricted Stock Plans [Member] | 2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance	2,363,000
Plan expiration date	Jan. 24, 2027
Number of shares available for future grants	1,757,650
Restricted Stock Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock	3 years
Restricted Stock Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock	5 years
Incentive Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options	10 years
Nonqualified Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options	15 years

Commitments And Contingencies75

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Unadvanced home equity lines of credit	$ 240	$ 262.8

Commitments And Contingencies76

Commitments And Contingencies (Commitments Outstanding To Originate, Purchase, Or Participate In Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Originate fixed-rate	$ 33,528	$ 68,047
Originate adjustable-rate	9,861	12,257
Purchase/participate fixed-rate	74,104	138,792
Purchase/participate adjustable-rate	52,453	18,653
Commitments outstanding to originate, purchase, or participate in loans	$ 169,946	$ 237,749

Regulatory Capital Requiremen77

Regulatory Capital Requirements Regulatory Capital Requirements (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Regulatory Capital Requirements [Abstract]
Liquidation account balance	$ 167.2
Capital Conservation Buffer, Annual Increase	0.625%
Required Capital Conservation Buffer	1.25%	0.625%
Capital Conservation Buffer, Fully Phased-In Percentage	2.50%

Regulatory Capital Requiremen78

Regulatory Capital Requirements (Summary Of Capital And Total Risk-Based Capital Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Capitol Federal Financial Inc [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, Actual Amount	$ 1,365,395	$ 1,387,049
Tier 1 leverage ratio, Actual Ratio	12.30%	12.30%
Tier 1 leverage ratio, For Capital Adequacy Purposes, Amount	$ 444,785	$ 452,248
Tier 1 leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
CET1 capital ratio, Actual Amount	$ 1,365,395	$ 1,387,049
CET1 capital ratio, Actual Ratio	30.80%	32.00%
CET1 capital ratio, For Capital Adequacy Purposes, Amount	$ 199,195	$ 195,094
CET1 capital ratio, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tier 1 capital ratio, Actual Amount	$ 1,365,395	$ 1,387,049
Tier 1 capital ratio, Actual Ratio	30.80%	32.00%
Tier 1 capital ratio, For Capital Adequacy Purposes, Amount	$ 265,594	$ 260,126
Tier 1 capital ratio, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Total capital ratio, Actual Amount	$ 1,373,793	$ 1,395,589
Total capital ratio, Actual Ratio	31.00%	32.20%
Total capital ratio, For Capital Adequacy Purposes, Amount	$ 354,125	$ 346,835
Total capital ratio, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Capitol Federal Savings Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, Actual Amount	$ 1,201,863	$ 1,234,912
Tier 1 leverage ratio, Actual Ratio	10.80%	10.90%
Tier 1 leverage ratio, For Capital Adequacy Purposes, Amount	$ 444,877	$ 452,339
Tier 1 leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 556,097	$ 565,424
Tier 1 leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
CET1 capital ratio, Actual Amount	$ 1,201,863	$ 1,234,912
CET1 capital ratio, Actual Ratio	27.20%	28.50%
CET1 capital ratio, For Capital Adequacy Purposes, Amount	$ 199,181	$ 195,080
CET1 capital ratio, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
CET1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 287,706	$ 281,783
CET1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier 1 capital ratio, Actual Amount	$ 1,201,863	$ 1,234,912
Tier 1 capital ratio, Actual Ratio	27.20%	28.50%
Tier 1 capital ratio, For Capital Adequacy Purposes, Amount	$ 265,575	$ 260,107
Tier 1 capital ratio, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 354,100	$ 346,809
Tier 1 capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Total capital ratio, Actual Amount	$ 1,210,261	$ 1,243,452
Total capital ratio, Actual Ratio	27.30%	28.70%
Total capital ratio, For Capital Adequacy Purposes, Amount	$ 354,100	$ 346,809
Total capital ratio, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 442,625	$ 433,512
Total capital ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%

Fair Value Of Financial Instr79

Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from principal repayments	$ 144,643	$ 326,814	$ 234,794
Loans individually evaluated for impairment	18,400	42,000
ACL maintained for individually evaluated impaired loans	0	0
OREO	$ 1,400	3,700
Loans Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated selling costs	10.00%
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated selling costs	10.00%
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of deposits	$ 2,400,000	2,340,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of deposits	2,920,000	2,870,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from principal repayments	88	97	400
(Decreases) increases in net unrealized losses included in OCI	(218)	61	$ 45
Loans individually evaluated for impairment	18,400	42,000
OREO	$ 1,400	$ 3,700

Fair Value Of Financial Instr80

Fair Value Of Financial Instruments (Schedule Of Fair Value Assets Measured On A 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]
AFS securities	$ 415,831	$ 527,301
Interest rate swaps	598
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
Interest rate swaps	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	413,780	525,545
Interest rate swaps	598
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	2,051	1,756
Interest rate swaps	0
GSE Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	270,729	347,038
GSE Debentures [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
GSE Debentures [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	270,729	347,038
GSE Debentures [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	141,516	178,507
MBS [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
MBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	141,516	178,507
MBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	1,535
Municipal Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0
Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	1,535
Municipal Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0
Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	2,051	1,756
Trust Preferred Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
Trust Preferred Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	0
Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	$ 2,051	$ 1,756

Fair Value Of Financial Instr81

Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Assets:
AFS securities	$ 415,831	$ 527,301
HTM securities	833,009	1,122,867
Liabilities:
Interest rate swaps	598
Carrying Amount [Member]
Assets:
Cash and cash equivalents	351,659	281,764
AFS securities	415,831	527,301
HTM securities	827,738	1,100,874
Loans receivable	7,195,071	6,958,024
FHLB stock	100,954	109,970
Liabilities:
Deposits	5,309,868	5,164,018
FHLB borrowings	2,173,808	2,372,389
Repurchase agreements	200,000	200,000
Interest rate swaps	598	0
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	351,659	281,764
AFS securities	415,831	527,301
HTM securities	833,009	1,122,867
Loans receivable	7,354,100	7,292,971
FHLB stock	100,954	109,970
Liabilities:
Deposits	5,318,249	5,204,251
FHLB borrowings	2,182,841	2,434,151
Repurchase agreements	202,004	207,303
Interest rate swaps	$ 598	$ 0

Other Comprehensive Income (Det

Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at October 1, 2016	$ 5,915
Other comprehensive income (loss), before reclassifications	(3,131)
Amount reclassified from AOCI	134	$ 0	$ 0
Other comprehensive income (loss)	(2,997)
Balance at September 30, 2017	2,918	5,915
Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at October 1, 2016	5,915
Other comprehensive income (loss), before reclassifications	(2,625)
Amount reclassified from AOCI	0
Other comprehensive income (loss)	(2,625)
Balance at September 30, 2017	3,290	5,915
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at October 1, 2016	0
Other comprehensive income (loss), before reclassifications	(506)
Amount reclassified from AOCI	134
Other comprehensive income (loss)	(372)
Balance at September 30, 2017	$ (372)	$ 0

Selected Quarterly Financial 83

Selected Quarterly Financial Data (Unaudited) (Summary Of Quarterly Data) (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
Selected Quarterly Financial Information [Abstract]
Total interest and dividend income	$ 80,574	$ 79,630	$ 77,660	$ 75,322	$ 75,595	$ 75,527	$ 75,632	$ 74,359	$ 313,186	$ 301,113	$ 297,362
Net interest and dividend income	49,658	49,364	49,054	47,306	47,732	47,930	48,538	47,982	195,382	192,182	189,768
Provision for credit losses	0	0	0	0	(750)	0	0	0	0	(750)	771
Net income	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 20,698	$ 20,551	$ 21,527	$ 20,718	$ 84,137	$ 83,494	$ 78,093
Basic EPS	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.16	$ 0.15	$ 0.16	$ 0.16	$ 0.63	$ 0.63	$ 0.58
Diluted EPS	0.15	0.16	0.16	0.15	0.16	0.15	0.16	0.16	0.63	0.63	0.58
Dividends declared per share	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.085	$ 0.335	$ 0.085	$ 0.335	$ 0.88	$ 0.84	$ 0.84
Average number of basic shares outstanding	134,314,000	134,254,000	134,066,000	133,697,000	133,296,000	133,102,000	132,960,000	132,822,000	134,082,420	133,045,215	135,383,693
Average number of diluted shares outstanding	134,404,000	134,360,000	134,259,000	133,950,000	133,493,000	133,251,000	133,031,000	132,911,000	134,243,862	133,176,376	135,408,503

Parent Company Financial Info84

Parent Company Financial Information (Parent Company Only) (Schedule Of Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
ASSETS:
Cash and cash equivalents	$ 351,659	$ 281,764	$ 772,632	$ 810,840
Other assets	216,845	206,093
TOTAL ASSETS	9,192,916	9,267,247
LIABILITIES:
Income taxes payable, net	530	310
Accounts payable and accrued expenses	52,190	49,549
Deferred income tax liabilities, net	24,458	25,374
Total liabilities	7,824,603	7,874,283
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 100,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $.01 par value; 1,400,000,000 shares authorized; 138,223,835 and 137,486,172 shares issued and outstanding as of September 30, 2017 and 2016, respectively	1,382	1,375
Additional paid-in capital	1,167,368	1,156,855
Unearned compensation - ESOP	(37,995)	(39,647)
Retained earnings	234,640	268,466
Total stockholders' equity	1,368,313	1,392,964	1,416,226	1,492,882
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,192,916	$ 9,267,247
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,400,000,000	1,400,000,000
Common stock, shares issued	138,223,835	137,486,172
Common stock, shares outstanding	138,223,835	137,486,172
Capitol Federal Financial Inc [Member]
ASSETS:
Cash and cash equivalents	$ 120,785	$ 108,197	$ 96,171	$ 139,540
Investment in the Bank	1,204,781	1,240,827
Note receivable - ESOP	42,557	43,790
Other assets	365	389
TOTAL ASSETS	1,368,488	1,393,203
LIABILITIES:
Income taxes payable, net	88	128
Accounts payable and accrued expenses	52	74
Deferred income tax liabilities, net	35	37
Total liabilities	175	239
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value; 100,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $.01 par value; 1,400,000,000 shares authorized; 138,223,835 and 137,486,172 shares issued and outstanding as of September 30, 2017 and 2016, respectively	1,382	1,375
Additional paid-in capital	1,167,368	1,156,855
Unearned compensation - ESOP	(37,995)	(39,647)
Retained earnings	234,640	268,466
AOCI, net of tax	2,918	5,915
Total stockholders' equity	1,368,313	1,392,964
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,368,488	$ 1,393,203
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,400,000,000	1,400,000,000
Common stock, shares issued	138,223,835	137,486,172
Common stock, shares outstanding	138,223,835	137,486,172

Parent Company Financial Info85

Parent Company Financial Information (Parent Company Only) (Schedule Of Statements Of Income) (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
INTEREST AND DIVIDEND INCOME:
Total interest and dividend income	$ 80,574	$ 79,630	$ 77,660	$ 75,322	$ 75,595	$ 75,527	$ 75,632	$ 74,359	$ 313,186	$ 301,113	$ 297,362
INTEREST EXPENSE									117,804	108,931	107,594
NET INTEREST AND DIVIDEND INCOME	49,658	49,364	49,054	47,306	47,732	47,930	48,538	47,982	195,382	192,182	189,768
NON-INTEREST INCOME									4,910	5,057	5,093
NON-INTEREST EXPENSE:
Salaries and employee benefits									43,437	42,378	43,309
Regulatory and outside services									5,821	5,645	5,347
Other non-interest expense									2,827	3,384	3,290
Total non-interest expense									89,658	94,305	94,369
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									127,920	121,939	115,768
INCOME TAX EXPENSE									43,783	38,445	37,675
NET INCOME	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 20,698	$ 20,551	$ 21,527	$ 20,718	84,137	83,494	78,093
Capitol Federal Financial Inc [Member]
INTEREST AND DIVIDEND INCOME:
Dividend income from the Bank									120,215	117,513	115,359
Interest income from other investments									1,715	1,725	1,835
Total interest and dividend income									121,930	119,238	117,194
NON-INTEREST EXPENSE:
Salaries and employee benefits									896	827	835
Regulatory and outside services									247	261	243
Other non-interest expense									561	558	517
Total non-interest expense									1,704	1,646	1,595
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									120,226	117,592	115,599
INCOME TAX EXPENSE									4	28	84
INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									120,222	117,564	115,515
EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									(36,085)	(34,070)	(37,422)
NET INCOME									$ 84,137	$ 83,494	$ 78,093

Parent Company Financial Info86

Parent Company Financial Information (Parent Company Only) (Schedule Of 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	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 20,698	$ 20,551	$ 21,527	$ 20,718	$ 84,137	$ 83,494	$ 78,093
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of equipment									7,796	7,141	6,844
Provision for deferred income taxes									922	470	3,201
Changes in:
Other assets									(680)	1,807	3,878
Accounts payable and accrued expenses									(10,743)	(6,840)	(6,215)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid									(117,963)	(111,767)	(114,162)
Repurchase of common stock									0	0	(50,034)
Stock options exercised									8,843	4,070	267
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									69,895	(490,868)	(38,208)
CASH AND CASH EQUIVALENTS:
Beginning of year				281,764				772,632	281,764	772,632	810,840
End of year	351,659				281,764				351,659	281,764	772,632
Capitol Federal Financial Inc [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									84,137	83,494	78,093
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in excess of distribution over earnings of subsidiary									36,085	34,070	37,422
Depreciation of equipment									29	30	30
Provision for deferred income taxes									(2)	2	428
Changes in:
Other assets									(5)	1	35
Income taxes receivable/payable									(40)	445	3,300
Accounts payable and accrued expenses									(22)	14	1
Net cash flows provided by operating activities									120,182	118,056	119,309
CASH FLOWS FROM INVESTING ACTIVITIES:
Principal collected on notes receivable from ESOP									1,233	1,194	1,156
Net cash flows provided by investing activities									1,233	1,194	1,156
CASH FLOWS FROM FINANCING ACTIVITIES:
Net payment from subsidiary related to restricted stock awards									293	473	95
Dividends paid									(117,963)	(111,767)	(114,162)
Repurchase of common stock									0	0	(50,034)
Stock options exercised									8,843	4,070	267
Net cash flows used in financing activities									(108,827)	(107,224)	(163,834)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS									12,588	12,026	(43,369)
CASH AND CASH EQUIVALENTS:
Beginning of year				$ 108,197				$ 96,171	108,197	96,171	139,540
End of year	$ 120,785				$ 108,197				$ 120,785	$ 108,197	$ 96,171