Capitol Federal Financial (CFFN) 10-K 29 Nov 18 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Nov. 21, 2018	Mar. 31, 2018
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
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		141,238,239
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,680

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
ASSETS:
Cash and cash equivalents (includes interest-earning deposits of $122,733 and $340,748)	$ 139,055	$ 351,659
Securities:
Available-for-sale (AFS), at estimated fair value (amortized cost of $718,564 and $410,541)	714,614	415,831
Held-to-maturity (HTM), at amortized cost (estimated fair value of $601,071 and $833,009)	612,318	827,738
Loans receivable, net (allowance for credit losses (ACL) of $8,463 and $8,398)	7,514,485	7,195,071
Federal Home Loan Bank Topeka (FHLB) stock, at cost	99,726	100,954
Premises and equipment, net	96,005	84,818
Income taxes receivable, net	2,177	0
Other assets	271,167	216,845
TOTAL ASSETS	9,449,547	9,192,916
LIABILITIES:
Deposits	5,603,354	5,309,868
FHLB borrowings	2,174,981	2,173,808
Other borrowings	110,052	200,000
Advance payments by borrowers for taxes and insurance	65,264	63,749
Income taxes payable, net	0	530
Deferred income tax liabilities, net	21,253	24,458
Accounts payable and accrued expenses	83,021	52,190
Total liabilities	8,057,925	7,824,603
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; 141,225,516 and 138,223,835 shares issued and outstanding as of September 30, 2018 and 2017, respectively	1,412	1,382
Additional paid-in capital	1,207,644	1,167,368
Unearned compensation, Employee Stock Ownership Plan (ESOP)	(36,343)	(37,995)
Retained earnings	214,569	234,640
Accumulated other comprehensive income (AOCI), net of tax	4,340	2,918
Total stockholders' equity	1,391,622	1,368,313
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,449,547	$ 9,192,916

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Interest-earning deposits	$ 122,733	$ 340,748
Available-for-sale securities, amortized cost	718,564	410,541
Held-to-maturity securities, estimated fair value	601,071	833,009
Loans receivable, allowance for credit losses	$ 8,463	$ 8,398
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	141,225,516	138,223,835
Common stock, shares outstanding	141,225,516	138,223,835

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
INTEREST AND DIVIDEND INCOME:
Loans receivable	$ 260,198	$ 253,393	$ 243,311
Cash and cash equivalents	23,443	19,389	9,831
Mortgage-backed securities (MBS)	22,619	23,809	29,794
FHLB stock	10,962	12,233	12,252
Investment securities	4,670	4,362	5,925
Total interest and dividend income	321,892	313,186	301,113
INTEREST EXPENSE:
FHLB borrowings	67,120	68,871	65,091
Deposits	52,625	42,968	37,859
Other borrowings	3,374	5,965	5,981
Total interest expense	123,119	117,804	108,931
NET INTEREST INCOME	198,773	195,382	192,182
PROVISION FOR CREDIT LOSSES	0	0	(750)
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	198,773	195,382	192,932
NON-INTEREST INCOME:
Income from bank-owned life insurance (BOLI)	1,875	2,233	3,420
Other non-interest income	4,524	4,910	5,057
Total non-interest income	22,035	22,196	23,312
NON-INTEREST EXPENSE:
Salaries and employee benefits	46,563	43,437	42,378
Information technology and related expense	13,999	11,282	10,540
Occupancy, net	11,455	10,814	10,576
Regulatory and outside services	5,709	5,821	5,645
Deposit and loan transaction costs	5,621	5,284	5,585
Advertising and promotional	5,034	4,673	4,609
Federal insurance premium	3,277	3,539	5,076
Office supplies and related expense	1,888	1,981	2,640
Low income housing partnerships	0	0	3,872
Other non-interest expense	3,356	2,827	3,384
Total non-interest expense	96,902	89,658	94,305
INCOME BEFORE INCOME TAX EXPENSE	123,906	127,920	121,939
INCOME TAX EXPENSE	24,979	43,783	38,445
NET INCOME	$ 98,927	$ 84,137	$ 83,494
Basic earnings per share (EPS)	$ 0.73	$ 0.63	$ 0.63
Diluted EPS	0.73	0.63	0.63
Dividends declared per share	$ 0.88	$ 0.88	$ 0.84
Deposit Account [Member]
NON-INTEREST INCOME:
Deposit service fees	$ 15,636	$ 15,053	$ 14,835

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 98,927	$ 84,137	$ 83,494
Other comprehensive income (loss), net of tax:
Changes in unrealized gains (losses) on AFS securities, net of taxes of $2,499, $1,595, and $1,494	(6,741)	(2,625)	(2,459)
Changes in unrealized gains (losses) on cash flow hedges, net of taxes of $(2,785), $226, and $0	7,496	(372)	0
Comprehensive income	$ 99,682	$ 81,140	$ 81,035

Consolidated Statements Of Co_2

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Changes in unrealized gains (losses) on AFS securities, deferred income taxes	$ (2,499)	$ (1,595)	$ (1,494)
Changes in unrealized gains (losses) on cash flow hedges, deferred income taxes	$ 2,785	$ (226)	$ 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, 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	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	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
Net income	98,927				98,927
Other comprehensive income (loss), net of tax	755					755
Reclassification of certain tax effects related to adoption of Accounting Standards Update (ASU) 2018-02	0				(667)	667
Cumulative effect of adopting ASU 2016-09	0		19		(19)
Capital City Bancshares, Inc. (CCB) acquisition	39,113	30	39,083
ESOP activity	2,193		541	1,652
Stock-based compensation	372		372
Stock options exercised	261		261
Cash dividends to stockholders	(118,312)				(118,312)
Balance at Sep. 30, 2018	$ 1,391,622	$ 1,412	$ 1,207,644	$ (36,343)	$ 214,569	$ 4,340

Consolidated Statements Of St_2

Consolidated Statements Of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends to stockholders	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.88	$ 0.88	$ 0.84

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 98,927	$ 84,137	$ 83,494
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(10,962)	(12,233)	(12,252)
Provision for credit losses	0	0	(750)
Originations of loans receivable held-for-sale (LHFS)	(777)	0	0
Proceeds from sales of LHFS	16,423	6,816	0
Amortization and accretion of premiums and discounts on securities	3,150	4,479	5,342
Depreciation and amortization of premises and equipment	8,458	7,796	7,141
Amortization of intangible assets	234	0	0
Amortization of deferred amounts related to FHLB advances, net	1,173	1,419	1,868
Common stock committed to be released for allocation - ESOP	2,193	2,436	2,174
Stock-based compensation	372	506	1,121
Provision for deferred income taxes	(4,540)	922	470
Changes in cash collateral received from derivative counterparty, net	10,701	(731)	0
Changes in:
Other assets, net	1,712	51	1,807
Income taxes payable, net	(2,262)	590	1,381
Accounts payable and accrued expenses	(639)	(10,743)	(6,840)
Net cash provided by operating activities	124,163	85,445	84,956
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(411,459)	(37,425)	(99,927)
Purchase of HTM securities	0	0	(144,392)
Proceeds from calls, maturities and principal reductions of AFS securities	192,966	144,643	326,814
Proceeds from calls, maturities and principal reductions of HTM securities	212,267	268,689	309,328
Proceeds from sale of AFS securities	2,078	0	0
Proceeds from the redemption of FHLB stock	291,506	386,900	382,450
Purchase of FHLB stock	(277,552)	(365,651)	(329,625)
Net increase in loans receivable	(37,537)	(246,882)	(336,056)
Purchase of premises and equipment	(11,761)	(9,128)	(14,854)
Proceeds from sale of other real estate owned (OREO)	2,240	5,138	4,973
Cash acquired from acquisition	15,685	0	0
Proceeds from BOLI death benefit	0	0	783
Net cash (used in) provided by investing activities	(21,567)	146,284	99,494
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(118,312)	(117,963)	(111,767)
Net change in deposits	(58,988)	145,850	331,498
Proceeds from borrowings	17,275,100	2,700,100	8,000,100
Repayments on borrowings	(17,414,200)	(2,900,100)	(8,900,100)
Change in advance payments by borrowers for taxes and insurance	939	1,106	825
Stock options exercised	261	8,843	4,070
Excess tax benefits from stock options	0	330	56
Net cash used in financing activities	(315,200)	(161,834)	(675,318)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(212,604)	69,895	(490,868)
CASH AND CASH EQUIVALENTS:
Beginning of year	351,659	281,764	772,632
End of year	139,055	351,659	281,764
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	24,785	37,875	36,483
Interest payments	119,699	117,308	106,182
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to LHFS	15,814	6,714	0
Common stock issued	39,113	0	0
Fair value of assets acquired, excluding acquired cash and intangibles	418,062	0	0
Fair value of liabilities assumed	$ 412,675	$ 0	$ 0

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2018
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 48 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 two wholly owned subsidiaries, Capitol Funds, Inc. and Capital City Investments, Inc. Capitol Funds, Inc. has a wholly-owned subsidiary, Capitol Federal Mortgage Reinsurance Company. Capital City Investments, Inc. is a real estate and investment holding company. All intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements have been prepared in accordance 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 Company also owns 100 percent of Capital City Statutory Trust I ("CCST") and Capital City Statutory Trust II ("CCSTII") (collectively, the "Trusts"). The accounts of the Trusts do not qualify for consolidation accounting. The Company reports its subordinated debentures issued to the Trusts as other borrowings in the consolidated balance sheets and the common stock of the Trusts is reported as an equity method investment in other assets in the consolidated balance sheets. 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, 2018 and 2017 was $120.8 million and $337.5 million , respectively. The Bank is in compliance with the FRB requirements. For the years ended September 30, 2018 and 2017 , the average daily balance of required reserves at the FRB of Kansas City was $11.0 million and $9.1 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 15. 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, 2018 and 2017 , 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. Such concessions generally involve extensions of loan maturity dates, the granting of periods during which reduced payment amounts are required, and/or reductions in interest rates. If a concession requires assistance in the form of an interest rate reduction to less than the current market rate, or should the borrower have been discharged from Chapter 7 bankruptcy without reaffirming the debt, then the loan is classified as a TDR. The Bank does not forgive principal or interest nor does it commit to lend additional funds to these borrowers, except for situations generally involving the capitalization of delinquent interest and/or escrow not to exceed the original loan amount. 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 generally discontinued when interest or principal payments are 90 days in arrears, unless, in the case of commercial loans, the loan is well secured and in the process of collection. 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, except in the case of commercial loans in which all delinquent accrued interest 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, in which case interest income is no longer recognized. Loans reported as impaired loans include loans partially charged-off and TDRs. Acquired Loans - Acquired loans are initially recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected prepayments, projected default rates, loss given default and recovery rates, with no carryover of any existing ACL. Acquired loans with evidence of credit quality deterioration at acquisition are reviewed to determine if it is probable that the Company will not be able to collect all contractual amounts due, including both principal and interest. When both conditions exist, such loans are categorized and accounted for as purchased credit impaired ("PCI") loans. When these conditions do not exist, the loans are categorized as non-PCI loans. The Company has determined that the amount and timing of cash flows to be collected from PCI loans cannot be reasonably estimated. As such, income related to PCI loans is recognized using the cost recovery method. Cash receipts are applied first as a reduction to the carrying amount of the loan. Once the entire carrying amount has been recovered, additional income is applied to any principal amounts previously written off, with any excess being recognized as interest income. 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 factors. 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. When a non-real estate secured consumer loan is 120 days delinquent, any identified losses are charged-off. For commercial loans, generally losses are charged-off when the loan is more than 120 days delinquent and it is determined, through the analysis of any available current financial information with regards to the borrower, that the borrower is not able to service the debt and there is little or no prospect for near term improvement, or, in the case of secured loans, it is determined, through the analysis of current information with regards to the Bank's collateral position, that the amounts due from the borrower are in excess of the calculated current fair value of the collateral after consideration of estimated costs to sell. Charge-offs for any loan type may also occur at any time if the Bank has knowledge of the existence of a probable 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 the ability of borrowers to repay their loans, resulting in increased delinquencies, non-performing assets, loan losses, and future loan loss provisions. Although the commercial 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 business operations and to control operational and/or business 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 more limited than that for a residential property. Therefore, 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. Our commercial and industrial loans are primarily secured by accounts receivable, inventory and equipment, which may be difficult to appraise, may be illiquid and may fluctuate in value based on the success of the business. 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 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 geographic location. 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. The commercial loan portfolio is segregated into additional categories based on loan source (originated or participation) and the type of loan (real estate loan, construction loan or commercial and industrial). 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, and delinquent loan trends. The qualitative loss factors for the commercial 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. For non-PCI loans, the Company estimates a hypothetical amount of ACL. The Company uses the acquired bank's past loss history adjusted for qualitative factors to establish the hypothetical amount of ACL. This amount is compared with the remaining net purchase discount for the non-PCI loans to test for credit quality deterioration and the possible need for an additional loan loss provision. To the extent the remaining net purchase discount of the pool is greater than the hypothetical ACL, no additional ACL is necessary. If the remaining net purchase discount of the pool is less than the hypothetical ACL, the difference results in an increase to the ACL recorded through a provision for credit losses. Management utilizes the formula analysis model, along with analyzing and considering several other relevant internal and external factors when evaluating the adequacy of the ACL. Such factors 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 may 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, 2018, 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. Leasehold improvements are amortized over the shorter of their estimated useful lives or the term of the respective leases. 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. Other Assets - Included in other assets on the consolidated balance sheet are the Company's intangible assets, recognized as a result of the acquisition of CCB, which consist of goodwill, deposit intangibles and other intangibles. Goodwill is assessed for impairment on an annual basis, or more frequently in certain circumstances. The test for impairment is performed by comparing the fair value of the reporting unit with its carrying amount. If the fair value is determined to be less than the carrying amount, an impairment is recorded. The Company's intangible assets primarily relate to core deposits. These intangible assets are amortized based upon the expected economic benefit over an estimated life of approximately 8 years and are tested for impairment whenever events or circumstances change. 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 and 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, if any, 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. 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 ESOP 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 ESOP shares become outstanding for EPS computations once they are committed to be released. 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, with the related expense reported as interest expense on the consolidated statements of income, 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 7. 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. Trust Asset Management - Assets (other than cash deposits with the Bank) held in fiduciary or agency capacities for customers are not included in the accompanying consolidated balance sheets, since such items are not assets of the Company or its subsidiaries. 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 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. The Company completed its identification of revenue within the scope of the ASU and has concluded that the new guidance does not require any significant changes in the revenue recognition process. However, the Company believes it is appropriate to classify interchange network charges, currently reported as expense, as a reduction in revenue upon adoption of the ASU. The Company intends to elect to implement the ASU using the modified retrospective application, with the cumulative effect recorded as an adjustment to opening retained earnings at October 1, 2018. The cumul

Acquisition

Acquisition	12 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisition	ACQUISITION On August 31, 2018, the Company completed the acquisition of CCB and its wholly-owned subsidiary Capital City Bank headquartered in Topeka, Kansas. Capital City Bank owned and leased banking locations in Topeka, Lawrence, and Overland Park, Kansas. The acquisition was not considered significant to the Company's financial statements; therefore, pro-forma financial data and related disclosures are not included. The Company acquired loans and deposits with fair values of $299.7 million and $352.5 million , respectively, at the date of acquisition. Included in the loans acquired from CCB at August 31, 2018 were PCI loans with contractually required cash flows totaling $2.6 million . Of that amount, the Company expects to collect $1.9 million , which was also the fair value at the date of acquisition. Under the terms of the acquisition agreement, the Company issued 3.0 million shares of common stock for all outstanding shares of CCB capital stock, for a total merger consideration of $39.1 million , based on the Company's closing stock price of $13.21 on August 31, 2018 . See "Note 8. Intangible Assets" for additional information regarding the acquisition of CCB. During fiscal year 2018, the Company incurred $872 thousand of pre-tax merger-related expenses attributable to the CCB acquisition. The merger-related expenses are reflected on the Company's consolidated statement of income and are reported primarily in regulatory and outside services.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Sep. 30, 2018
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, 2018 2017 2016 (Dollars in thousands, except per share amounts) Net income $ 98,927 $ 84,137 $ 83,494 Income allocated to participating securities (40 ) (44 ) (66 ) Net income available to common stockholders $ 98,887 $ 84,093 $ 83,428 Average common shares outstanding 134,635,886 134,019,962 132,982,815 Average committed ESOP shares outstanding 62,458 62,458 62,400 Total basic average common shares outstanding 134,698,344 134,082,420 133,045,215 Effect of dilutive stock options 60,647 161,442 131,161 Total diluted average common shares outstanding 134,758,991 134,243,862 133,176,376 Net EPS: Basic $ 0.73 $ 0.63 $ 0.63 Diluted $ 0.73 $ 0.63 $ 0.63 Antidilutive stock options, excluded from the diluted average common shares outstanding calculation 541,418 200,800 886,417

Securities

Securities	12 Months Ended
	Sep. 30, 2018
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, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: MBS $ 445,883 $ 3,270 $ 4,063 $ 445,090 GSE debentures 268,525 30 3,157 265,398 Municipal bonds 4,156 — 30 4,126 $ 718,564 $ 3,300 $ 7,250 $ 714,614 HTM: MBS $ 591,900 $ 4,514 $ 15,589 $ 580,825 Municipal bonds 20,418 — 172 20,246 $ 612,318 $ 4,514 $ 15,761 $ 601,071 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 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, 2018 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: MBS $ 324,563 $ 3,797 $ 8,129 $ 266 GSE debentures 101,735 1,231 148,049 1,926 Municipal bonds 4,126 30 — — $ 430,424 $ 5,058 $ 156,178 $ 2,192 HTM: MBS $ 58,233 $ 904 $ 362,806 $ 14,685 Municipal bonds 18,345 171 685 1 $ 76,578 $ 1,075 $ 363,491 $ 14,686 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 The unrealized losses at September 30, 2018 and 2017 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, 2018 or 2017 . 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, 2018 , 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 $ 54,627 $ 54,476 $ 4,161 $ 4,152 One year through five years 218,054 215,048 16,257 16,094 272,681 269,524 20,418 20,246 MBS 445,883 445,090 591,900 580,825 $ 718,564 $ 714,614 $ 612,318 $ 601,071 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, 2018 2017 2016 (Dollars in thousands) Taxable $ 4,275 $ 3,847 $ 5,255 Non-taxable 395 515 670 $ 4,670 $ 4,362 $ 5,925 The following table summarizes the carrying value of securities pledged as collateral for the obligations indicated below as of the dates presented. September 30, 2018 2017 (Dollars in thousands) Public unit deposits $ 515,553 $ 499,993 Repurchase agreements 108,360 214,298 FRB of Kansas City 9,529 11,769 $ 633,442 $ 726,060 During the current fiscal year, the Company sold trust preferred securities and received proceeds of $2.1 million . The Company recognized a gain of $9 thousand on the sale. All other dispositions of securities during fiscal years 2018 , 2017 , and 2016 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, 2018
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, 2018 and 2017 is summarized as follows: 2018 2017 (Dollars in thousands) One- to four-family: Originated $ 3,965,692 $ 3,959,232 Correspondent purchased 2,505,987 2,445,311 Bulk purchased 293,607 351,705 Construction 33,149 30,647 Total 6,798,435 6,786,895 Commercial: Commercial real estate 426,243 183,030 Commercial and industrial 62,869 — Construction 80,498 86,952 Total 569,610 269,982 Consumer: Home equity 129,588 122,066 Other 10,012 3,808 Total 139,600 125,874 Total loans receivable 7,507,645 7,182,751 Less: ACL 8,463 8,398 Discounts/unearned loan fees 33,933 24,962 Premiums/deferred costs (49,236 ) (45,680 ) $ 7,514,485 $ 7,195,071 Included in the loan portfolio at September 30, 2018 were $296.5 million of non-PCI loans and $2.4 million of PCI loans associated with the acquisition of CCB during fiscal year 2018. At September 30, 2018 , the Company had $5.5 million of net purchase discounts related to non-PCI loans and $516 thousand related to PCI loans. As of September 30, 2018 and 2017 , the Bank serviced loans for others aggregating $134.2 million and $101.2 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 $2.4 million and $2.1 million as of September 30, 2018 and 2017 , respectively. Lending Practices and Underwriting Standards - Originating and purchasing one- to four-family loans is the Bank's primary lending business. The Bank also originates consumer loans primarily secured by one- to four-family residential properties and originates and participates in commercial loans. The Bank has a loan concentration in one- to four-family loans and a geographic concentration of these loans 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 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 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 and owner-occupied construction-to-permanent loans secured by one- to four-family residential real estate. 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 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 1.20 . Appraisals on properties securing these loans are performed by independent state certified fee appraisers. The Bank's commercial and industrial loans are generally made in the Bank's market areas and are underwritten on the basis of the borrower's ability to service the debt from income. Working capital loans are primarily collateralized by short-term assets whereas term loans are primarily collateralized by long-term assets. In general, commercial and industrial loans involve more credit risk than commercial real estate loans due to the type of collateral securing these loans, as well as the expectation that commercial and industrial loans generally will be serviced principally from the operations of the business, and those operations may not be successful. As a result of these additional complexities, variables and risks, these loans require more thorough underwriting and servicing than other types of loans. Consumer loans - The Bank offers a variety of secured consumer loans, including home equity loans and lines of credit, home improvement loans, vehicle loans, and loans secured by deposits. The Bank also originates a very limited amount of unsecured loans. 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. These segments are further divided 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, consumer - other, commercial - commercial real estate, and commercial - commercial and industrial. 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 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, 2018 and 2017 , all loans 90 or more days delinquent were on nonaccrual status. September 30, 2018 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 $ 10,613 $ 5,025 $ 15,638 $ 3,968,362 $ 3,984,000 Correspondent purchased 3,846 458 4,304 2,536,913 2,541,217 Bulk purchased 3,521 3,063 6,584 288,386 294,970 Commercial: Commercial real estate 76 — 76 501,932 502,008 Commercial and industrial 250 — 250 61,255 61,505 Consumer: Home equity 472 521 993 128,351 129,344 Other 61 10 71 9,833 9,904 $ 18,839 $ 9,077 $ 27,916 $ 7,495,032 $ 7,522,948 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 Correspondent purchased 1,855 92 1,947 2,477,916 2,479,863 Bulk purchased 3,233 3,399 6,632 346,807 353,439 Commercial: Commercial real estate — — — 268,979 268,979 Commercial and industrial — — — — — Consumer: Home equity 467 406 873 121,193 122,066 Other 33 4 37 3,771 3,808 $ 18,804 $ 9,401 $ 28,205 $ 7,175,264 $ 7,203,469 The recorded investment in mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process as of September 30, 2018 and 2017 was $2.9 million and $4.3 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 $1.3 million at September 30, 2018 and $1.4 million at September 30, 2017 . The following table presents the recorded investment, by class, in loans classified as nonaccrual at the dates presented. September 30, 2018 2017 (Dollars in thousands) One- to four-family: Originated $ 6,503 $ 10,054 Correspondent purchased 863 1,804 Bulk purchased 3,063 4,264 Commercial: Commercial real estate — — Commercial and industrial — — Consumer: Home equity 530 519 Other 10 4 $ 10,969 $ 16,645 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, 2018 2017 Special Mention Substandard Special Mention Substandard (Dollars in thousands) One- to four-family: Originated $ 8,660 $ 22,409 $ 7,031 $ 30,059 Correspondent purchased 997 3,126 261 3,800 Bulk purchased — 7,195 — 8,005 Commercial: Commercial real estate 1,251 1,368 — — Commercial and industrial 1,126 — — — Consumer: Home equity 298 894 9 1,032 Other — 10 — 4 $ 12,332 $ 35,002 $ 7,301 $ 42,900 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 2018 , 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, 2018 2017 Credit Score LTV Credit Score LTV One- to four-family - originated 767 63 % 767 63 % One- to four-family - correspondent 764 67 764 68 One- to four-family - bulk purchased 758 62 757 63 Consumer - home equity 750 22 755 19 765 63 765 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 material, resulted in fewer loans being classified as TDRs in the current fiscal year. For the Year Ended September 30, 2018 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family: Originated 5 $ 264 $ 281 Correspondent purchased 2 406 406 Bulk purchased — — — Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity — — — Other — — — 7 $ 670 $ 687 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 Correspondent purchased 12 2,443 2,459 Bulk purchased 3 1,031 1,048 Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity 17 368 380 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 Correspondent purchased 12 2,592 2,619 Bulk purchased 3 596 594 Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity 19 427 433 Other 1 8 8 157 $ 20,824 $ 21,211 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, 2018 September 30, 2017 September 30, 2016 Number of Recorded Number of Recorded Number of Recorded Contracts Investment Contracts Investment Contracts Investment (Dollars in thousands) One- to four-family: Originated 22 $ 1,416 46 $ 4,561 48 $ 5,330 Correspondent purchased 1 124 2 148 3 548 Bulk purchased 3 1,040 2 698 — — Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 4 133 16 440 6 174 Other — — — — — — 30 $ 2,713 66 $ 5,847 57 $ 6,052 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. All impaired loans were individually evaluated for loss and all losses were charged-off, resulting in no related ACL for these loans. September 30, 2018 September 30, 2017 Unpaid Unpaid Recorded Principal Recorded Principal Investment Balance Investment Balance (Dollars in thousands) One- to four-family: Originated $ 18,857 $ 19,388 $ 30,251 $ 30,953 Correspondent purchased 2,668 2,768 3,800 3,771 Bulk purchased 6,011 6,976 7,403 8,606 Commercial: Commercial real estate — — — — Commercial and industrial — — — — Consumer: Home equity 504 720 775 997 Other — 25 — 24 $ 28,040 $ 29,877 $ 42,229 $ 44,351 The following information pertains to impaired loans, by class, for the periods presented. For the Years Ended September 30, 2018 September 30, 2017 September 30, 2016 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 $ 23,847 $ 990 $ 24,122 $ 917 $ 12,063 $ 470 Correspondent purchased 3,204 112 3,346 118 495 18 Bulk purchased 6,438 191 9,852 194 11,022 196 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 588 39 988 86 628 93 Other — — 7 — 13 1 34,077 1,332 38,315 1,315 24,221 778 With an allowance recorded One- to four-family: Originated — — 11,469 434 24,199 983 Correspondent purchased — — 2,018 65 2,669 50 Bulk purchased — — 1,160 20 2,219 27 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity — — 457 36 895 64 Other — — 10 1 13 1 — — 15,114 556 29,995 1,125 Total One- to four-family: Originated 23,847 990 35,591 1,351 36,262 1,453 Correspondent purchased 3,204 112 5,364 183 3,164 68 Bulk purchased 6,438 191 11,012 214 13,241 223 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 588 39 1,445 122 1,523 157 Other — — 17 1 26 2 $ 34,077 $ 1,332 $ 53,429 $ 1,871 $ 54,216 $ 1,903 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, 2018 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial Consumer Total (Dollars in thousands) Beginning balance $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 Charge-offs (136 ) (128 ) — (264 ) — (38 ) (302 ) Recoveries 144 — 196 340 — 27 367 Provision for credit losses (228 ) 67 (271 ) (432 ) 444 (12 ) — Ending balance $ 2,953 $ 1,861 $ 925 $ 5,739 $ 2,556 $ 168 $ 8,463 For the Year Ended September 30, 2017 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial 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 Originated Purchased Purchased Total Commercial 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 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, 2018 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 3,965,143 $ 2,538,549 $ 288,959 $ 6,792,651 $ 563,513 $ 138,744 $ 7,494,908 Recorded investment in loans individually evaluated for impairment 18,857 2,668 6,011 27,536 — 504 28,040 $ 3,984,000 $ 2,541,217 $ 294,970 $ 6,820,187 $ 563,513 $ 139,248 $ 7,522,948 ACL for loans collectively evaluated for impairment $ 2,953 $ 1,861 $ 925 $ 5,739 $ 2,556 $ 168 $ 8,463 September 30, 2017 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial 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

Premises And Equipment

Premises And Equipment	12 Months Ended
	Sep. 30, 2018
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, 2018 and 2017 was as follows: 2018 2017 (Dollars in thousands) Land $ 13,536 $ 11,670 Building and improvements 107,580 96,401 Furniture, fixtures and equipment 48,852 43,410 169,968 151,481 Less accumulated depreciation 73,963 66,663 $ 96,005 $ 84,818 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 $1.2 million , $1.1 million , and $1.2 million for the years ended September 30, 2018 , 2017 , and 2016 , respectively. As of September 30, 2018 , 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: 2019 $ 1,364 2020 1,067 2021 941 2022 828 2023 689 Thereafter 1,573 $ 6,462

Low Income Housing Partnerships

Low Income Housing Partnerships	12 Months Ended
	Sep. 30, 2018
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 $74.5 million and $66.1 million at September 30, 2018 and 2017 , respectively. The Bank's obligations related to unfunded commitments, which are included in accounts payable and accrued expenses in the consolidated balance sheets, were $34.0 million and $29.4 million at September 30, 2018 and 2017 , respectively. The majority of the commitments at September 30, 2018 are projected to be funded through the end of calendar year 2021 . For fiscal year 2018 , 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 years 2018 and 2017 was $7.0 million and $4.4 million , respectively, and the amount of affordable housing tax credits and other related tax benefits was $7.5 million and $6.9 million , respectively, resulting in a net income tax benefit of $500 thousand and $2.5 million , respectively. The increase in proportional amortization expense was due primarily to a change in the tax rate resulting from the Tax Act, as well as to changes in the life cycle stage of the investments. For fiscal year 2016 , 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 . There were no impairment losses during fiscal years 2018 , 2017 , or 2016 resulting from the forfeiture or ineligibility of tax credits or other circumstances.

Intangible Assets

Intangible Assets	12 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS With the acquisition of CCB, the Company recognized goodwill of $8.0 million , which is calculated as the consideration exchanged in excess of the fair value of assets, net of the fair value of liabilities assumed. The Company also recognized $10.1 million of other intangible assets which is largely composed of core deposit intangibles. These assets will be amortized over their estimated lives, which management has determined to be 8 years . Changes in the carrying amount of the Company's intangible assets, which are included in other assets on the consolidated balance sheet, for fiscal year 2018 are presented in the following table. Goodwill Core Deposit and Other Intangibles (Dollars in thousands) Balance as of September 30, 2017 $ — $ — Add: Acquisition of CCB 7,989 10,052 Less: Amortization — (234 ) Balance as of September 30, 2018 $ 7,989 $ 9,819 As of September 30, 2018 , there was no impairment recorded on goodwill or other intangible assets. The estimated amortization expense for the next five years related to the core deposit and other intangible assets as of September 30, 2018 is presented in the following table (dollars in thousands): 2019 $ 2,317 2020 1,964 2021 1,659 2022 1,358 2023 1,056

Deposits and Borrowed Funds

Deposits and Borrowed Funds	12 Months Ended
	Sep. 30, 2018
Deposits and Borrowed Funds [Abstract]
Deposits and Borrowed Funds	DEPOSITS AND BORROWED FUNDS Deposits - Non-interest-bearing deposits totaled $336.5 million and $243.7 million as of September 30, 2018 and 2017 , respectively. Certificates of deposit with a minimum denomination of $250 thousand were $668.8 million and $676.1 million as of September 30, 2018 and 2017 , 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, 2018 consisted of $2.07 billion in FHLB advances, of which $1.60 billion were fixed-rate advances and $475.0 million were variable-rate advances, and $100.0 million against the variable-rate FHLB line of credit. 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. There were no borrowings against the variable-rate FHLB line of credit at September 30, 2017 . The line of credit is set to expire on November 15, 2019 , at which time it is expected to be renewed by FHLB for a one year period. FHLB advances at September 30, 2018 and 2017 were comprised of the following: 2018 2017 (Dollars in thousands) FHLB advances $ 2,075,000 $ 2,175,000 Deferred prepayment penalty (19 ) (1,192 ) $ 2,074,981 $ 2,173,808 Weighted average contractual interest rate on FHLB advances 2.07 % 1.96 % Weighted average effective interest rate on FHLB advances (1) 2.12 2.09 (1) The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the adjustable-rate FHLB advances. During fiscal years 2018 , 2017 and 2016 , 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, or earlier if the strategy it is not profitable. 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. At September 30, 2018 and 2017 , the Bank had entered into interest rate swap agreements with a total notional amount of $475.0 million and $200.0 million , respectively, in order to hedge the variable cash flows associated with $475.0 million and $200.0 million , respectively, of adjustable-rate FHLB advances. At September 30, 2018 and 2017 , the interest rate swap agreements had an average remaining term to maturity of 5.8 years and 5.9 years , respectively. 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, 2018 , the interest rate swaps were in a gain position with a total fair value of $9.7 million , which was reported in other assets on the consolidated balance sheet. At September 30, 2017 , the interest rate swaps were in a loss position with a total fair value of $598 thousand , which was reported in accounts payable and accrued expenses on the consolidated balance sheet. During fiscal years 2018 and 2017 , $515 thousand and $134 thousand , respectively, were reclassified from AOCI as an increase to interest expense and no hedge ineffectiveness was recognized in the consolidated statements of income during either period. At September 30, 2018 , the Company estimates that $755 thousand will be reclassified as a decrease to interest expense during the next 12 months. The Bank has minimum collateral posting thresholds with its derivative counterparty and posts collateral on a daily basis. The Bank held cash collateral of $10.0 million at September 30, 2018 and posted cash collateral of $731 thousand at September 30, 2017 . 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 2018, the president of FHLB approved an increase, through July 2019, in the Bank's borrowing limit to 55% of Bank Call Report total assets. At September 30, 2018 , the ratio of the par value of the Bank's FHLB borrowings to the Bank's Call Report total assets was 23% . At times, the Bank's FHLB borrowings to the Bank's Call Report total assets may be in excess of 40% due to the leverage strategy. Repurchase Agreements - At September 30, 2018 and 2017 , the Company had repurchase agreements outstanding in the amount of $100.0 million and $200.0 million , respectively, with a weighted average contractual rate of 2.53% and 2.94% respectively. The repurchase agreements are included in other borrowings on the consolidated balance sheet. All of the Company's repurchase agreements at September 30, 2018 and 2017 were fixed-rate. See Note 4 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, 2018 : FHLB Repurchase Certificates Advances Agreements of Deposit Amount Amount Amount (Dollars in thousands) 2019 $ 875,000 $ — $ 1,229,859 2020 350,000 100,000 812,885 2021 550,000 — 372,331 2022 200,000 — 401,527 2023 100,000 — 119,313 Thereafter — — 1,142 $ 2,075,000 $ 100,000 $ 2,937,057 Junior Subordinated Debentures and Trust-Preferred Securities - In conjunction with the CCB acquisition, the Company acquired $10.1 million of mandatorily redeemable capital trust-preferred securities that were previously issued by CCB-sponsored trusts (the "Trusts") to third-party investors. The Company also acquired $302 thousand of common equity securities that were issued by the Trusts which is included in other assets on the consolidated balance sheet. The proceeds from such securities were invested in junior subordinated debentures issued by CCB. The junior subordinated debentures are included in other borrowings on the consolidated balance sheet. The terms of the trust-preferred securities are identical to those of the junior subordinated debentures. The trust-preferred securities are subject to mandatory redemption upon repayment of the junior subordinated debentures at their stated maturity dates or earlier redemption in an amount equal to their liquidation amount plus accumulated and unpaid distributions to the date of redemption. The Company guarantees the payment of distributions and payments for redemption or liquidation of the trust-preferred securities to the extent of funds held by the Trusts. The junior subordinated debentures are unsecured with interest distributions payable quarterly. Of the $10.1 million , $6.2 million bear interest at 10.6% with a maturity date of September 7, 2030 and $3.9 million bear interest at three-month London Interbank Offered Rate ("LIBOR") p lus 3.45% ( 5.82% at September 30, 2018 ) with a maturity date of June 26, 2032 . The Company intends to redeem the trust-preferred securities and related junior subordinated debentures during fiscal year 2019.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income tax expense for the years ended September 30, 2018 , 2017 , and 2016 consisted of the following: 2018 2017 2016 (Dollars in thousands) Current: Federal $ 26,007 $ 38,127 $ 33,298 State 3,512 4,734 4,677 29,519 42,861 37,975 Deferred: Federal (5,956 ) 712 286 State 1,416 210 184 (4,540 ) 922 470 $ 24,979 $ 43,783 $ 38,445 The Tax Act made significant changes to the U.S. corporate income tax laws, such as a permanent reduction in the federal corporate income tax rate from 35% to 21% effective January 1, 2018, bonus depreciation that will allow full expensing of qualified property, and other changes to and/or limitations on certain corporate income tax deductions. As required by Section 15 of the Internal Revenue Code, the Company had a blended statutory federal income tax rate of 24.5% for the year ended September 30, 2018, which is based on the applicable income tax rates prior to and subsequent to January 1, 2018 and the number of days in the fiscal year. In accordance with GAAP, the Company revalued its deferred tax assets and liabilities as of December 22, 2017 to account for the future impact of a lower federal income tax rate. The revaluation of the Company's deferred tax assets and liabilities resulted in a $7.5 million reduction in income tax expense during the December 31, 2017 quarter and a corresponding reduction in the Company's net deferred tax liability. During the December 31, 2017 quarter, management reviewed the carrying value of the Bank's low income housing partnership investments in relation to the remaining tax benefits, considering the reduction in the corporate income tax rate, and determined there was no impairment present. The Company's effective tax rates were 20.2% , 34.2% , and 31.5% for the years ended September 30, 2018 , 2017 , and 2016 , respectively. The decrease in the effective tax rate for the year ended September 30, 2018 was due primarily to the revaluation of the Company's deferred tax assets and liabilities along with a lower blended statutory federal tax rate as a result of the enactment of the Tax Act. The differences between such effective rates and the statutory Federal income tax rate computed on income before income tax expense resulted from the following: 2018 2017 2016 Amount % Amount % Amount % (Dollars in thousands) Federal income tax expense computed at statutory Federal rate $ 30,392 24.5 % $ 44,772 35.0 % $ 42,679 35.0 % Increases (decreases) in taxes resulting from: State taxes, net of Federal tax effect 3,986 3.2 3,452 2.7 3,308 2.7 Deferred tax liability remeasurement, net (7,498 ) (6.0 ) — — — — Low income housing tax credits, presented net of proportional amortization in 2018 and 2017 (500 ) (0.4 ) (2,468 ) (2.0 ) (4,815 ) (4.0 ) ESOP related expenses, net (790 ) (0.6 ) (1,052 ) (0.8 ) (1,127 ) (0.9 ) Other (611 ) (0.5 ) (921 ) (0.7 ) (1,600 ) (1.3 ) $ 24,979 20.2 % $ 43,783 34.2 % $ 38,445 31.5 % 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 and 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, 2018 , 2017 , and 2016 were as follows: 2018 2017 2016 (Dollars in thousands) ACL $ 1,827 $ 185 $ 480 Salaries, deferred compensation and employee benefits 897 437 (143 ) Low income housing partnerships 604 285 (318 ) FHLB stock dividends (7,692 ) 4 (1,357 ) Premises and equipment (122 ) 14 1,593 Other, net (54 ) (3 ) 215 $ (4,540 ) $ 922 $ 470 The components of the net deferred income tax liabilities as of September 30, 2018 and 2017 were as follows: 2018 2017 (Dollars in thousands) Deferred income tax assets: Salaries, deferred compensation and employee benefits $ 1,686 $ 2,583 Net purchase discounts related to acquired loans 1,456 — ESOP compensation 1,206 1,724 Unrealized loss on AFS securities 960 — Low income housing partnerships 874 1,478 ACL — 711 Other 3,154 2,621 Gross deferred income tax assets 9,336 9,117 Valuation allowance (1,822 ) (1,795 ) Gross deferred income tax asset, net of valuation allowance 7,514 7,322 Deferred income tax liabilities: FHLB stock dividends 15,550 23,242 Premises and equipment 5,983 6,105 Deposit intangible 2,567 — Unrealized gain on interest rate swap 2,353 — ACL 1,116 — Unrealized gain on AFS securities — 2,000 Other 1,198 433 Gross deferred income tax liabilities 28,767 31,780 Net deferred tax liabilities $ 21,253 $ 24,458 The State of Kansas allows for a bad debt deduction on savings and loan institutions' privilege tax returns of up to 5% of Kansas taxable income. Due to the low level of net loan charge-offs experienced by the Bank historically, the Bank's bad debt deduction on the Kansas privilege tax return has been in excess of actual net charge-offs for several years resulting in a state deferred tax liability. At September 30, 2018, the state deferred tax liability associated with ACL was in excess of the federal deferred tax asset. 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, 2018 and 2017 , 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, Capitol Funds, Inc. and Capital City Investments, Inc., as the Bank files a Kansas privilege tax return. Based on the nature of the operations of the holding company, Capitol Funds, Inc. and Capital City Investments, 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, 2018 and 2017 . Accounting Standards 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, 2018 and 2017 , the Company had no unrecognized tax benefits. For the year ended September 30, 2016 , 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 2015 .

Employee Stock Ownership Plan

Employee Stock Ownership Plan	12 Months Ended
	Sep. 30, 2018
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, 2018 , 165,198 shares were released from collateral. On September 30, 2019, 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 $2.9 million for the year ended September 30, 2018 , $3.3 million for the year ended September 30, 2017 , and $3.0 million for the year ended September 30, 2016 . Of these amounts, $541 thousand , $784 thousand , and $522 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, 2018 , 2017 , and 2016 , respectively. The amount included in compensation expense for dividends on unallocated ESOP shares in excess of the debt service payments was $688 thousand , $833 thousand , and $813 thousand for the years ended September 30, 2018 , 2017 , and 2016 , respectively. Shares may be withdrawn from the ESOP trust due to diversification (a participant may begin to diversify at least 25% of their ESOP shares at age 50 ), retirement, termination, or death of the participant. The following is a summary of shares held in the ESOP trust as of September 30, 2018 and 2017 : 2018 2017 (Dollars in thousands) Allocated ESOP shares 4,339,002 4,369,840 Unreleased ESOP shares 3,634,356 3,799,554 Total ESOP shares 7,973,358 8,169,394 Fair value of unreleased ESOP shares $ 46,302 $ 55,853

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Sep. 30, 2018
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 504,195 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, 2018 , 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 exercise 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, 2018 , the Company had 1,210,374 stock options outstanding with a weighted average exercise price of $13.33 per option and a weighted average contractual life of 4.3 years , and 1,161,374 options exercisable with a weighted average exercise price of $13.37 per option and a weighted average contractual life of 4.2 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, 2018 , 2017 , and 2016 totaled $71 thousand , $118 thousand , and $335 thousand , respectively. The fair value of stock options vested during the years ended September 30, 2018 , 2017 , and 2016 was $77 thousand , $174 thousand , and $652 thousand , respectively. As of September 30, 2018 , the total future compensation cost related to non-vested stock options not yet recognized in the consolidated statements of income was $61 thousand , and the weighted average period over which these awards are expected to be recognized was 1.2 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, 2018 , the Company had 1,738,750 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, 2018 , the Company had 53,150 unvested restricted stock shares with a weighted average grant date fair value of $13.48 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, 2018 , 2017 , and 2016 totaled $301 thousand , $388 thousand , and $787 thousand , respectively. The fair value of restricted stock that vested during the years ended September 30, 2018 , 2017 , and 2016 totaled $294 thousand , $563 thousand , and $1.6 million , respectively. As of September 30, 2018 there was $572 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, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES The following table summarizes the Bank's loan commitments as of September 30, 2018 and 2017 : 2018 2017 (Dollars in thousands) Originate fixed-rate $ 46,645 $ 33,528 Originate adjustable-rate 25,228 9,861 Purchase/participate fixed-rate 122,418 74,104 Purchase/participate adjustable-rate 10,085 52,453 $ 204,376 $ 169,946 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, 2018 and 2017 , there were no significant loan-related commitments that met the definition of derivatives or commitments to sell mortgage loans. As of September 30, 2018 and 2017 , the Bank had approved but unadvanced lines of credit of $246.1 million and $240.0 million , respectively. Upon the acquisition of CCB, the Company assumed certain standby letters of credit, which are conditional commitments to guarantee the performance of a customer to a third party. Most guarantees have one-year terms. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. At September 30, 2018 , the Company had approximately $1.2 million in outstanding standby letters of credit, and no amounts have been recorded as liabilities for the Company's potential obligations under these agreements. 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, 2018 , or future periods.

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Sep. 30, 2018
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, 2018 , the balance of this liquidation account was $145.4 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 1.875% at September 30, 2018 and 1.25% at September 30, 2017 . At September 30, 2018 and 2017 , 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, 2018 , 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, 2018 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, 2018 Tier 1 leverage $ 1,202,125 13.0 % $ 370,559 4.0 % $ 463,199 5.0 % Common Equity Tier 1 ("CET1") capital 1,202,125 25.1 215,764 4.5 311,659 6.5 Tier 1 capital 1,202,125 25.1 287,685 6.0 383,580 8.0 Total capital 1,210,589 25.2 383,580 8.0 479,475 10.0 As of September 30, 2017 Tier 1 leverage 1,201,863 10.8 444,877 4.0 556,097 5.0 CET1 capital 1,201,863 27.2 199,181 4.5 287,706 6.5 Tier 1 capital 1,201,863 27.2 265,575 6.0 354,100 8.0 Total capital 1,210,261 27.3 354,100 8.0 442,625 10.0 Company As of September 30, 2018 Tier 1 leverage 1,381,791 14.9 370,475 4.0 N/A N/A CET1 capital 1,381,791 28.6 215,793 4.5 N/A N/A Tier 1 capital 1,381,791 28.8 287,724 6.0 N/A N/A Total capital 1,390,255 29.0 383,632 8.0 N/A N/A As of September 30, 2017 Tier 1 leverage 1,365,395 12.3 444,785 4.0 N/A N/A CET1 capital 1,365,395 30.8 199,195 4.5 N/A N/A Tier 1 capital 1,365,395 30.8 265,594 6.0 N/A N/A Total capital 1,373,793 31.0 354,125 8.0 N/A N/A

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	12 Months Ended
	Sep. 30, 2018
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. 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, 2018 and 2017 . 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 other assets on the consolidated balance sheet if in a gain position, and in accounts payable and accrued expenses if in a loss position, with any unrealized gains and losses, net of taxes, reported as AOCI in stockholders' equity. See "Note 9. Deposits and Borrowed Funds" for additional information. The estimated fair value of the interest rates swaps are obtained from the counterparty and are determined using a discounted cash flow analysis using observable market-based inputs. On a quarterly basis, management corroborates the estimated fair values by internally calculating the estimated fair value using a discounted cash flow analysis using independent observable market-based inputs from a third party. The Company did not make any adjustments to the estimated fair value during the years ended September 30, 2018 and 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, 2018 . September 30, 2018 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: MBS $ 445,090 $ — $ 445,090 $ — GSE debentures 265,398 — 265,398 — Municipal bonds 4,126 — 4,126 — 714,614 — 714,614 — Interest rate swaps 9,685 — 9,685 — $ 724,299 $ — $ 724,299 $ — 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 $ — The Company sold its Level 3 AFS security during fiscal year 2018, received proceeds of $2.1 million , and recognized a gain on sale of $9 thousand , which is included in other non-interest income in the Company's consolidated statement of income. The Company's Level 3 AFS securities had no activity during fiscal years 2017 and 2016 except for principal repayments of $88 thousand and $97 thousand , respectively, and (decreases)/increases in net unrealized losses included in other comprehensive income of $(218) thousand and $61 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 amount of loans individually evaluated for impairment on a non-recurring basis during fiscal years 2018 and 2017 that were still held in the portfolio as of September 30, 2018 and 2017 was $6.7 million and $18.4 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. Management does not adjust or apply a discount to the appraised value, except for the estimated sales cost noted above. The primary significant unobservable input for loans individually evaluated for impairment 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, 2018 and 2017 ; 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. Also included in OREO at September 30, 2018 was $889 thousand of OREO acquired from CCB. The fair value for the OREO not acquired from CCB 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 measured on a non-recurring basis during fiscal years 2018 and 2017 that was still held in the portfolio as of September 30, 2018 and 2017 was $1.9 million and $1.4 million , respectively. The carrying value of the properties equaled the fair value of the properties at September 30, 2018 and 2017 . 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: 2018 2017 Estimated Estimated Carrying Fair Carrying Fair Amount Value Amount Value (Dollars in thousands) Assets: Cash and cash equivalents $ 139,055 $ 139,055 $ 351,659 $ 351,659 AFS securities 714,614 714,614 415,831 415,831 HTM securities 612,318 601,071 827,738 833,009 Loans receivable 7,514,485 7,418,026 7,195,071 7,354,100 FHLB stock 99,726 99,726 100,954 100,954 Interest rate swaps 9,685 9,685 — — Liabilities: Deposits 5,603,354 5,569,591 5,309,868 5,318,249 FHLB borrowings 2,174,981 2,145,477 2,173,808 2,182,841 Other borrowings 110,052 109,465 200,000 202,004 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) 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) 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, 2018 and 2017 was $2.67 billion and $2.40 billion , respectively. (Level 1) The fair value of certificates of deposit is estimated by discounting future cash flows using current LIBOR. The estimated fair value of certificates of deposit at September 30, 2018 and 2017 was $2.90 billion and $2.92 billion , respectively. (Level 2) FHLB borrowings and other borrowings - The fair value of fixed-maturity borrowed funds is estimated by discounting estimated future cash flows using current offer rates. (Level 2) The carrying value of FHLB line of credit is considered to approximate its fair value due to the nature of the financial liability. (Level 1) The fair value of the junior subordinated debentures is estimated as the payoff value, as management intends to redeem these borrowings during fiscal year 2019. (Level 1)

Other Comprehensive Income

Other Comprehensive Income	12 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Other Comprehensive Income	OTHER COMPREHENSIVE INCOME The following tables present the changes in the components of AOCI, net of tax, for the years ended September 30, 2018 and 2017 . During the year ended September 30, 2016 , 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, 2018 Unrealized Unrealized Gains (Losses) Gains (Losses) on AFS on Cash Flow Total Securities Hedges AOCI (dollars in thousands) Beginning balance $ 3,290 $ (372 ) $ 2,918 Other comprehensive income (loss), before reclassifications (6,741 ) 6,981 240 Amount reclassified from AOCI — 515 515 Other comprehensive income (loss) (6,741 ) 7,496 755 Reclassification of certain income tax effects related to adoption of ASU 2018-02 461 206 667 Ending balance $ (2,990 ) $ 7,330 $ 4,340 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) Beginning balance $ 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 ) Ending balance $ 3,290 $ (372 ) $ 2,918

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Sep. 30, 2018
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) 2018 Total interest and dividend income $ 80,644 $ 81,774 $ 82,161 $ 77,313 $ 321,892 Net interest and dividend income 49,374 49,889 49,433 50,077 198,773 Provision for credit losses — — — — — Net income 31,836 23,330 22,372 21,389 98,927 Basic EPS 0.24 0.17 0.17 0.16 0.73 Diluted EPS 0.24 0.17 0.17 0.16 0.73 Dividends declared per share 0.375 0.085 0.335 0.085 0.88 Average number of basic shares outstanding 134,373 134,428 134,484 135,500 134,698 Average number of diluted shares outstanding 134,467 134,475 134,530 135,556 134,759 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

Parent Company Financial Inform

Parent Company Financial Information (Parent Company Only)	12 Months Ended
	Sep. 30, 2018
Condensed Financial Information 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, 2018 and 2017 (Dollars in thousands, except per share amounts) 2018 2017 ASSETS: Cash and cash equivalents $ 137,684 $ 120,785 Investment in the Bank 1,221,706 1,204,781 Note receivable - ESOP 41,285 42,557 Other assets 690 365 Income taxes receivable, net 486 — TOTAL ASSETS $ 1,401,851 $ 1,368,488 LIABILITIES: Income taxes payable, net $ — $ 88 Junior subordinated debentures 10,052 — Accounts payable and accrued expenses 177 52 Deferred income tax liabilities, net — 35 Total liabilities 10,229 175 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, 141,225,516 and 138,223,835 shares issued and outstanding as of September 30, 2018 and 2017, respectively 1,412 1,382 Additional paid-in capital 1,207,644 1,167,368 Unearned compensation - ESOP (36,343 ) (37,995 ) Retained earnings 214,569 234,640 AOCI, net of tax 4,340 2,918 Total stockholders' equity 1,391,622 1,368,313 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 1,401,851 $ 1,368,488 STATEMENTS OF INCOME YEARS ENDED SEPTEMBER 30, 2018, 2017, and 2016 (Dollars in thousands) 2018 2017 2016 INTEREST AND DIVIDEND INCOME: Dividend income from the Bank $ 134,540 $ 120,215 $ 117,513 Interest income from other investments 1,951 1,715 1,725 Total interest and dividend income 136,491 121,930 119,238 INTEREST EXPENSE 62 — — NET INTEREST INCOME 136,429 121,930 119,238 NON-INTEREST EXPENSE: Salaries and employee benefits 1,031 896 827 Regulatory and outside services 1,129 247 261 Other non-interest expense 581 561 558 Total non-interest expense 2,741 1,704 1,646 INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 133,688 120,226 117,592 INCOME TAX (BENEFIT) EXPENSE (179 ) 4 28 INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 133,867 120,222 117,564 EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY (34,940 ) (36,085 ) (34,070 ) NET INCOME $ 98,927 $ 84,137 $ 83,494 STATEMENTS OF CASH FLOWS YEARS ENDED SEPTEMBER 30, 2018, 2017, and 2016 (Dollars in thousands) 2018 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 98,927 $ 84,137 $ 83,494 Adjustments to reconcile net income to net cash provided by operating activities: Equity in excess of distribution over earnings of subsidiary 34,940 36,085 34,070 Depreciation of equipment 30 29 30 Provision for deferred income taxes (35 ) (2 ) 2 Changes in: Other assets (53 ) (5 ) 1 Income taxes receivable/payable (145 ) (40 ) 445 Accounts payable and accrued expenses (257 ) (22 ) 14 Net cash provided by operating activities 133,407 120,182 118,056 CASH FLOWS FROM INVESTING ACTIVITIES: Principal collected on notes receivable from ESOP 1,272 1,233 1,194 Cash acquired from acquisition 18 — — Net cash provided by investing activities 1,290 1,233 1,194 CASH FLOWS FROM FINANCING ACTIVITIES: Net payment from subsidiary related to restricted stock awards 253 293 473 Cash dividends paid (118,312 ) (117,963 ) (111,767 ) Stock options exercised 261 8,843 4,070 Net cash used in financing activities (117,798 ) (108,827 ) (107,224 ) NET INCREASE IN CASH AND CASH EQUIVALENTS 16,899 12,588 12,026 CASH AND CASH EQUIVALENTS: Beginning of year 120,785 108,197 96,171 End of year $ 137,684 $ 120,785 $ 108,197 SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES: Common stock issued for acquisition $ 39,113 $ — $ — Capital contribution to subsidiary in conjunction with acquisition of CCB $ 48,798 $ — $ —

Summary Of Significant Accoun_2

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2018
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 48 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 two wholly owned subsidiaries, Capitol Funds, Inc. and Capital City Investments, Inc. Capitol Funds, Inc. has a wholly-owned subsidiary, Capitol Federal Mortgage Reinsurance Company. Capital City Investments, Inc. is a real estate and investment holding company. All intercompany accounts and transactions have been eliminated in consolidation. The consolidated financial statements have been prepared in accordance 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 Company also owns 100 percent of Capital City Statutory Trust I ("CCST") and Capital City Statutory Trust II ("CCSTII") (collectively, the "Trusts"). The accounts of the Trusts do not qualify for consolidation accounting. The Company reports its subordinated debentures issued to the Trusts as other borrowings in the consolidated balance sheets and the common stock of the Trusts is reported as an equity method investment in other assets in the consolidated balance sheets.
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, 2018 and 2017 was $120.8 million and $337.5 million , respectively. The Bank is in compliance with the FRB requirements. For the years ended September 30, 2018 and 2017 , the average daily balance of required reserves at the FRB of Kansas City was $11.0 million and $9.1 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 15. 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, 2018 and 2017 , 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. Such concessions generally involve extensions of loan maturity dates, the granting of periods during which reduced payment amounts are required, and/or reductions in interest rates. If a concession requires assistance in the form of an interest rate reduction to less than the current market rate, or should the borrower have been discharged from Chapter 7 bankruptcy without reaffirming the debt, then the loan is classified as a TDR. The Bank does not forgive principal or interest nor does it commit to lend additional funds to these borrowers, except for situations generally involving the capitalization of delinquent interest and/or escrow not to exceed the original loan amount. 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 generally discontinued when interest or principal payments are 90 days in arrears, unless, in the case of commercial loans, the loan is well secured and in the process of collection. 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, except in the case of commercial loans in which all delinquent accrued interest 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, in which case interest income is no longer recognized. Loans reported as impaired loans include loans partially charged-off and TDRs. Acquired Loans - Acquired loans are initially recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected prepayments, projected default rates, loss given default and recovery rates, with no carryover of any existing ACL. Acquired loans with evidence of credit quality deterioration at acquisition are reviewed to determine if it is probable that the Company will not be able to collect all contractual amounts due, including both principal and interest. When both conditions exist, such loans are categorized and accounted for as purchased credit impaired ("PCI") loans. When these conditions do not exist, the loans are categorized as non-PCI loans. The Company has determined that the amount and timing of cash flows to be collected from PCI loans cannot be reasonably estimated. As such, income related to PCI loans is recognized using the cost recovery method. Cash receipts are applied first as a reduction to the carrying amount of the loan. Once the entire carrying amount has been recovered, additional income is applied to any principal amounts previously written off, with any excess being recognized as interest income.
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 factors. 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. When a non-real estate secured consumer loan is 120 days delinquent, any identified losses are charged-off. For commercial loans, generally losses are charged-off when the loan is more than 120 days delinquent and it is determined, through the analysis of any available current financial information with regards to the borrower, that the borrower is not able to service the debt and there is little or no prospect for near term improvement, or, in the case of secured loans, it is determined, through the analysis of current information with regards to the Bank's collateral position, that the amounts due from the borrower are in excess of the calculated current fair value of the collateral after consideration of estimated costs to sell. Charge-offs for any loan type may also occur at any time if the Bank has knowledge of the existence of a probable 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 the ability of borrowers to repay their loans, resulting in increased delinquencies, non-performing assets, loan losses, and future loan loss provisions. Although the commercial 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 business operations and to control operational and/or business 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 more limited than that for a residential property. Therefore, 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. Our commercial and industrial loans are primarily secured by accounts receivable, inventory and equipment, which may be difficult to appraise, may be illiquid and may fluctuate in value based on the success of the business. 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 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 geographic location. 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. The commercial loan portfolio is segregated into additional categories based on loan source (originated or participation) and the type of loan (real estate loan, construction loan or commercial and industrial). 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, and delinquent loan trends. The qualitative loss factors for the commercial 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. For non-PCI loans, the Company estimates a hypothetical amount of ACL. The Company uses the acquired bank's past loss history adjusted for qualitative factors to establish the hypothetical amount of ACL. This amount is compared with the remaining net purchase discount for the non-PCI loans to test for credit quality deterioration and the possible need for an additional loan loss provision. To the extent the remaining net purchase discount of the pool is greater than the hypothetical ACL, no additional ACL is necessary. If the remaining net purchase discount of the pool is less than the hypothetical ACL, the difference results in an increase to the ACL recorded through a provision for credit losses. Management utilizes the formula analysis model, along with analyzing and considering several other relevant internal and external factors when evaluating the adequacy of the ACL. Such factors 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 may 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, 2018, 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. Leasehold improvements are amortized over the shorter of their estimated useful lives or the term of the respective leases. 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.
Other Assets	Included in other assets on the consolidated balance sheet are the Company's intangible assets, recognized as a result of the acquisition of CCB, which consist of goodwill, deposit intangibles and other intangibles. Goodwill is assessed for impairment on an annual basis, or more frequently in certain circumstances. The test for impairment is performed by comparing the fair value of the reporting unit with its carrying amount. If the fair value is determined to be less than the carrying amount, an impairment is recorded. The Company's intangible assets primarily relate to core deposits. These intangible assets are amortized based upon the expected economic benefit over an estimated life of approximately 8 years and are tested for impairment whenever events or circumstances change.
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 and 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, if any, 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. 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 ESOP 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 ESOP shares become outstanding for EPS computations once they are committed to be released.
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, with the related expense reported as interest expense on the consolidated statements of income, 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 7. 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.
Trust Asset Management	Assets (other than cash deposits with the Bank) held in fiduciary or agency capacities for customers are not included in the accompanying consolidated balance sheets, since such items are not assets of the Company or its subsidiaries.
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 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. The Company completed its identification of revenue within the scope of the ASU and has concluded that the new guidance does not require any significant changes in the revenue recognition process. However, the Company believes it is appropriate to classify interchange network charges, currently reported as expense, as a reduction in revenue upon adoption of the ASU. The Company intends to elect to implement the ASU using the modified retrospective application, with the cumulative effect recorded as an adjustment to opening retained earnings at October 1, 2018. The cumulative effect adjustment is not expected to be material to the consolidated financial statements. Additionally, the expanded disclosures required by the ASU will be provided starting with the Company's first quarter of 2019 Form 10-Q. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial 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 Company does not currently hold any equity investments included within the scope of the 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 balance sheet 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 the ASU may have on the Company's consolidated financial condition, results of operations and disclosures. Based on the Company's preliminary analysis, the ASU it is not expected to have a material impact when adopted. Upon adoption, the exit price notion will be utilized when determining the fair value of financial instruments measured at amortized cost in the Company's fair value 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. The accounting applied by a lessor is largely unchanged from that applied under the previous guidance. ASU 2016-02 will become effective for the Company on October 1, 2019. In July 2018, the FASB issued ASU 2018-11, Leases , which provides entities with relief from the costs of implementation by allowing the option to not restate comparative periods as part of the transition. The Company expects to select the transition relief provisions. The Company has completed its development of a lease inventory and an internal lease data collection, organization, and computing platform for compliance with this ASU. The Company is continuing to evaluate the impact this ASU may have on the Company's consolidated financial condition and results of operations. 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 the minimum commitments under non-cancellable leases as of the date of adoption. The Company's current minimum commitments under non-cancellable operating leases are disclosed in Note 6, Premises and Equipment. The Company is continuing to evaluate the impact this ASU may have to the Company's 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 Company adopted the ASU 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 been 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 selected a third-party vendor solution to assist in the application of this ASU and will begin implementation procedures in the first half of calendar year 2019. While we are currently unable to reasonably estimate the impact of adopting this ASU, we expect the impact of adoption will be influenced by the composition of our loan and securities portfolios as well as the economic conditions and forecasts at the time of adoption. In January 2017, the FASB issued ASU 2017-04 , Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment. The ASU simplifies the subsequent measurement of goodwill by eliminating the second step of the goodwill impairment test, which required computing the implied fair value of goodwill. Under the amendments in this update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The effective date of this ASU for the Company is October 1, 2020, with early adoption permitted. The Company elected to early-adopt this ASU during the current fiscal year. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted 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. In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The ASU helps organizations address certain stranded income tax effects in AOCI resulting from the tax legislation enacted by the U.S. government on December 22, 2017 commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act") by allowing the reclassification of these amounts from AOCI to retained earnings. The effective date of this ASU for the Company is October 1, 2019, with early adoption permitted. The Company elected to early-adopt this ASU during the current fiscal year and reclassify the related tax effects from the enactment of the Tax Act, specifically those related to the change in the federal corporate tax rate, from AOCI to retained earnings. The reclassification was applied prospectively and is reflected in the Consolidated Statements of Stockholders' Equity. The Company releases the income tax effects of unrealized gains and losses related to AFS securities on a portfolio basis. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement: Disclosure Framework - Changes to the Disclosures Requirements for Fair Value Measurement . This ASU eliminates, modifies and adds certain disclosure requirements for fair value measurements. The ASU adds disclosure requirements for the changes in unrealized gains and losses included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The effective date of this ASU for the Company is October 1, 2020, with early adoption permitted. Entities are allowed to elect early adoption of the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. Since this ASU only requires disclosure changes, it will not have a significant impact on the Company's consolidated financial condition and results of operations. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . The ASU aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include internal-use software license). The effective date of this ASU for the Company is October 1, 2020, with early adoption permitted. 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, 2018
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, 2018 2017 2016 (Dollars in thousands, except per share amounts) Net income $ 98,927 $ 84,137 $ 83,494 Income allocated to participating securities (40 ) (44 ) (66 ) Net income available to common stockholders $ 98,887 $ 84,093 $ 83,428 Average common shares outstanding 134,635,886 134,019,962 132,982,815 Average committed ESOP shares outstanding 62,458 62,458 62,400 Total basic average common shares outstanding 134,698,344 134,082,420 133,045,215 Effect of dilutive stock options 60,647 161,442 131,161 Total diluted average common shares outstanding 134,758,991 134,243,862 133,176,376 Net EPS: Basic $ 0.73 $ 0.63 $ 0.63 Diluted $ 0.73 $ 0.63 $ 0.63 Antidilutive stock options, excluded from the diluted average common shares outstanding calculation 541,418 200,800 886,417

Securities (Tables)

Securities (Tables)	12 Months Ended
	Sep. 30, 2018
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, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: MBS $ 445,883 $ 3,270 $ 4,063 $ 445,090 GSE debentures 268,525 30 3,157 265,398 Municipal bonds 4,156 — 30 4,126 $ 718,564 $ 3,300 $ 7,250 $ 714,614 HTM: MBS $ 591,900 $ 4,514 $ 15,589 $ 580,825 Municipal bonds 20,418 — 172 20,246 $ 612,318 $ 4,514 $ 15,761 $ 601,071 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
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, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in thousands) AFS: MBS $ 445,883 $ 3,270 $ 4,063 $ 445,090 GSE debentures 268,525 30 3,157 265,398 Municipal bonds 4,156 — 30 4,126 $ 718,564 $ 3,300 $ 7,250 $ 714,614 HTM: MBS $ 591,900 $ 4,514 $ 15,589 $ 580,825 Municipal bonds 20,418 — 172 20,246 $ 612,318 $ 4,514 $ 15,761 $ 601,071 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
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, 2018 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: MBS $ 324,563 $ 3,797 $ 8,129 $ 266 GSE debentures 101,735 1,231 148,049 1,926 Municipal bonds 4,126 30 — — $ 430,424 $ 5,058 $ 156,178 $ 2,192 HTM: MBS $ 58,233 $ 904 $ 362,806 $ 14,685 Municipal bonds 18,345 171 685 1 $ 76,578 $ 1,075 $ 363,491 $ 14,686 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
Schedule Of Contractual Maturities	The amortized cost and estimated fair value of debt securities as of September 30, 2018 , 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 $ 54,627 $ 54,476 $ 4,161 $ 4,152 One year through five years 218,054 215,048 16,257 16,094 272,681 269,524 20,418 20,246 MBS 445,883 445,090 591,900 580,825 $ 718,564 $ 714,614 $ 612,318 $ 601,071
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, 2018 2017 2016 (Dollars in thousands) Taxable $ 4,275 $ 3,847 $ 5,255 Non-taxable 395 515 670 $ 4,670 $ 4,362 $ 5,925
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, 2018 2017 (Dollars in thousands) Public unit deposits $ 515,553 $ 499,993 Repurchase agreements 108,360 214,298 FRB of Kansas City 9,529 11,769 $ 633,442 $ 726,060

Loans Receivable And Allowanc_2

Loans Receivable And Allowance For Credit Losses (Tables)	12 Months Ended
	Sep. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Summary of Loans Receivable	Loans receivable, net at September 30, 2018 and 2017 is summarized as follows: 2018 2017 (Dollars in thousands) One- to four-family: Originated $ 3,965,692 $ 3,959,232 Correspondent purchased 2,505,987 2,445,311 Bulk purchased 293,607 351,705 Construction 33,149 30,647 Total 6,798,435 6,786,895 Commercial: Commercial real estate 426,243 183,030 Commercial and industrial 62,869 — Construction 80,498 86,952 Total 569,610 269,982 Consumer: Home equity 129,588 122,066 Other 10,012 3,808 Total 139,600 125,874 Total loans receivable 7,507,645 7,182,751 Less: ACL 8,463 8,398 Discounts/unearned loan fees 33,933 24,962 Premiums/deferred costs (49,236 ) (45,680 ) $ 7,514,485 $ 7,195,071
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, 2018 and 2017 , all loans 90 or more days delinquent were on nonaccrual status. September 30, 2018 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 $ 10,613 $ 5,025 $ 15,638 $ 3,968,362 $ 3,984,000 Correspondent purchased 3,846 458 4,304 2,536,913 2,541,217 Bulk purchased 3,521 3,063 6,584 288,386 294,970 Commercial: Commercial real estate 76 — 76 501,932 502,008 Commercial and industrial 250 — 250 61,255 61,505 Consumer: Home equity 472 521 993 128,351 129,344 Other 61 10 71 9,833 9,904 $ 18,839 $ 9,077 $ 27,916 $ 7,495,032 $ 7,522,948 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 Correspondent purchased 1,855 92 1,947 2,477,916 2,479,863 Bulk purchased 3,233 3,399 6,632 346,807 353,439 Commercial: Commercial real estate — — — 268,979 268,979 Commercial and industrial — — — — — Consumer: Home equity 467 406 873 121,193 122,066 Other 33 4 37 3,771 3,808 $ 18,804 $ 9,401 $ 28,205 $ 7,175,264 $ 7,203,469
Recorded Investment in Loans, Nonaccrual	The following table presents the recorded investment, by class, in loans classified as nonaccrual at the dates presented. September 30, 2018 2017 (Dollars in thousands) One- to four-family: Originated $ 6,503 $ 10,054 Correspondent purchased 863 1,804 Bulk purchased 3,063 4,264 Commercial: Commercial real estate — — Commercial and industrial — — Consumer: Home equity 530 519 Other 10 4 $ 10,969 $ 16,645
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, 2018 2017 Special Mention Substandard Special Mention Substandard (Dollars in thousands) One- to four-family: Originated $ 8,660 $ 22,409 $ 7,031 $ 30,059 Correspondent purchased 997 3,126 261 3,800 Bulk purchased — 7,195 — 8,005 Commercial: Commercial real estate 1,251 1,368 — — Commercial and industrial 1,126 — — — Consumer: Home equity 298 894 9 1,032 Other — 10 — 4 $ 12,332 $ 35,002 $ 7,301 $ 42,900
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 2018 , 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, 2018 2017 Credit Score LTV Credit Score LTV One- to four-family - originated 767 63 % 767 63 % One- to four-family - correspondent 764 67 764 68 One- to four-family - bulk purchased 758 62 757 63 Consumer - home equity 750 22 755 19 765 63 765 64
Troubled Debt Restructurings on Financing Receivables	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, 2018 September 30, 2017 September 30, 2016 Number of Recorded Number of Recorded Number of Recorded Contracts Investment Contracts Investment Contracts Investment (Dollars in thousands) One- to four-family: Originated 22 $ 1,416 46 $ 4,561 48 $ 5,330 Correspondent purchased 1 124 2 148 3 548 Bulk purchased 3 1,040 2 698 — — Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 4 133 16 440 6 174 Other — — — — — — 30 $ 2,713 66 $ 5,847 57 $ 6,052 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 material, resulted in fewer loans being classified as TDRs in the current fiscal year. For the Year Ended September 30, 2018 Number Pre- Post- of Restructured Restructured Contracts Outstanding Outstanding (Dollars in thousands) One- to four-family: Originated 5 $ 264 $ 281 Correspondent purchased 2 406 406 Bulk purchased — — — Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity — — — Other — — — 7 $ 670 $ 687 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 Correspondent purchased 12 2,443 2,459 Bulk purchased 3 1,031 1,048 Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity 17 368 380 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 Correspondent purchased 12 2,592 2,619 Bulk purchased 3 596 594 Commercial: Commercial real estate — — — Commercial and industrial — — — Consumer: Home equity 19 427 433 Other 1 8 8 157 $ 20,824 $ 21,211
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. All impaired loans were individually evaluated for loss and all losses were charged-off, resulting in no related ACL for these loans. September 30, 2018 September 30, 2017 Unpaid Unpaid Recorded Principal Recorded Principal Investment Balance Investment Balance (Dollars in thousands) One- to four-family: Originated $ 18,857 $ 19,388 $ 30,251 $ 30,953 Correspondent purchased 2,668 2,768 3,800 3,771 Bulk purchased 6,011 6,976 7,403 8,606 Commercial: Commercial real estate — — — — Commercial and industrial — — — — Consumer: Home equity 504 720 775 997 Other — 25 — 24 $ 28,040 $ 29,877 $ 42,229 $ 44,351 The following information pertains to impaired loans, by class, for the periods presented. For the Years Ended September 30, 2018 September 30, 2017 September 30, 2016 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 $ 23,847 $ 990 $ 24,122 $ 917 $ 12,063 $ 470 Correspondent purchased 3,204 112 3,346 118 495 18 Bulk purchased 6,438 191 9,852 194 11,022 196 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 588 39 988 86 628 93 Other — — 7 — 13 1 34,077 1,332 38,315 1,315 24,221 778 With an allowance recorded One- to four-family: Originated — — 11,469 434 24,199 983 Correspondent purchased — — 2,018 65 2,669 50 Bulk purchased — — 1,160 20 2,219 27 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity — — 457 36 895 64 Other — — 10 1 13 1 — — 15,114 556 29,995 1,125 Total One- to four-family: Originated 23,847 990 35,591 1,351 36,262 1,453 Correspondent purchased 3,204 112 5,364 183 3,164 68 Bulk purchased 6,438 191 11,012 214 13,241 223 Commercial: Commercial real estate — — — — — — Commercial and industrial — — — — — — Consumer: Home equity 588 39 1,445 122 1,523 157 Other — — 17 1 26 2 $ 34,077 $ 1,332 $ 53,429 $ 1,871 $ 54,216 $ 1,903
Allowance for Credit Losses	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, 2018 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial Consumer Total (Dollars in thousands) Beginning balance $ 3,173 $ 1,922 $ 1,000 $ 6,095 $ 2,112 $ 191 $ 8,398 Charge-offs (136 ) (128 ) — (264 ) — (38 ) (302 ) Recoveries 144 — 196 340 — 27 367 Provision for credit losses (228 ) 67 (271 ) (432 ) 444 (12 ) — Ending balance $ 2,953 $ 1,861 $ 925 $ 5,739 $ 2,556 $ 168 $ 8,463 For the Year Ended September 30, 2017 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial 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 Originated Purchased Purchased Total Commercial 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 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, 2018 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial Consumer Total (Dollars in thousands) Recorded investment in loans collectively evaluated for impairment $ 3,965,143 $ 2,538,549 $ 288,959 $ 6,792,651 $ 563,513 $ 138,744 $ 7,494,908 Recorded investment in loans individually evaluated for impairment 18,857 2,668 6,011 27,536 — 504 28,040 $ 3,984,000 $ 2,541,217 $ 294,970 $ 6,820,187 $ 563,513 $ 139,248 $ 7,522,948 ACL for loans collectively evaluated for impairment $ 2,953 $ 1,861 $ 925 $ 5,739 $ 2,556 $ 168 $ 8,463 September 30, 2017 One- to Four-Family Correspondent Bulk Originated Purchased Purchased Total Commercial 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

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Sep. 30, 2018
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, 2018 and 2017 was as follows: 2018 2017 (Dollars in thousands) Land $ 13,536 $ 11,670 Building and improvements 107,580 96,401 Furniture, fixtures and equipment 48,852 43,410 169,968 151,481 Less accumulated depreciation 73,963 66,663 $ 96,005 $ 84,818
Schedule Of Future Minimum Rental Commitments	As of September 30, 2018 , 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: 2019 $ 1,364 2020 1,067 2021 941 2022 828 2023 689 Thereafter 1,573 $ 6,462

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	Changes in the carrying amount of the Company's intangible assets, which are included in other assets on the consolidated balance sheet, for fiscal year 2018 are presented in the following table. Goodwill Core Deposit and Other Intangibles (Dollars in thousands) Balance as of September 30, 2017 $ — $ — Add: Acquisition of CCB 7,989 10,052 Less: Amortization — (234 ) Balance as of September 30, 2018 $ 7,989 $ 9,819
Schedule of Core Deposit and Other Intangible Assets, Future Amortization Expense	The estimated amortization expense for the next five years related to the core deposit and other intangible assets as of September 30, 2018 is presented in the following table (dollars in thousands): 2019 $ 2,317 2020 1,964 2021 1,659 2022 1,358 2023 1,056

Deposits and Borrowed Funds (Ta

Deposits and Borrowed Funds (Tables)	12 Months Ended
	Sep. 30, 2018
Deposits and Borrowed Funds [Abstract]
FHLB Advances	FHLB advances at September 30, 2018 and 2017 were comprised of the following: 2018 2017 (Dollars in thousands) FHLB advances $ 2,075,000 $ 2,175,000 Deferred prepayment penalty (19 ) (1,192 ) $ 2,074,981 $ 2,173,808 Weighted average contractual interest rate on FHLB advances 2.07 % 1.96 % Weighted average effective interest rate on FHLB advances (1) 2.12 2.09 (1) The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the adjustable-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, 2018 : FHLB Repurchase Certificates Advances Agreements of Deposit Amount Amount Amount (Dollars in thousands) 2019 $ 875,000 $ — $ 1,229,859 2020 350,000 100,000 812,885 2021 550,000 — 372,331 2022 200,000 — 401,527 2023 100,000 — 119,313 Thereafter — — 1,142 $ 2,075,000 $ 100,000 $ 2,937,057

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Schedule Of Income Tax Expense	Income tax expense for the years ended September 30, 2018 , 2017 , and 2016 consisted of the following: 2018 2017 2016 (Dollars in thousands) Current: Federal $ 26,007 $ 38,127 $ 33,298 State 3,512 4,734 4,677 29,519 42,861 37,975 Deferred: Federal (5,956 ) 712 286 State 1,416 210 184 (4,540 ) 922 470 $ 24,979 $ 43,783 $ 38,445
Differences Between Effective Rates And Statutory Federal Income Tax Rate Computed On Income Before Income Tax Expense	The Company's effective tax rates were 20.2% , 34.2% , and 31.5% for the years ended September 30, 2018 , 2017 , and 2016 , respectively. The decrease in the effective tax rate for the year ended September 30, 2018 was due primarily to the revaluation of the Company's deferred tax assets and liabilities along with a lower blended statutory federal tax rate as a result of the enactment of the Tax Act. The differences between such effective rates and the statutory Federal income tax rate computed on income before income tax expense resulted from the following: 2018 2017 2016 Amount % Amount % Amount % (Dollars in thousands) Federal income tax expense computed at statutory Federal rate $ 30,392 24.5 % $ 44,772 35.0 % $ 42,679 35.0 % Increases (decreases) in taxes resulting from: State taxes, net of Federal tax effect 3,986 3.2 3,452 2.7 3,308 2.7 Deferred tax liability remeasurement, net (7,498 ) (6.0 ) — — — — Low income housing tax credits, presented net of proportional amortization in 2018 and 2017 (500 ) (0.4 ) (2,468 ) (2.0 ) (4,815 ) (4.0 ) ESOP related expenses, net (790 ) (0.6 ) (1,052 ) (0.8 ) (1,127 ) (0.9 ) Other (611 ) (0.5 ) (921 ) (0.7 ) (1,600 ) (1.3 ) $ 24,979 20.2 % $ 43,783 34.2 % $ 38,445 31.5 %
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 and 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, 2018 , 2017 , and 2016 were as follows: 2018 2017 2016 (Dollars in thousands) ACL $ 1,827 $ 185 $ 480 Salaries, deferred compensation and employee benefits 897 437 (143 ) Low income housing partnerships 604 285 (318 ) FHLB stock dividends (7,692 ) 4 (1,357 ) Premises and equipment (122 ) 14 1,593 Other, net (54 ) (3 ) 215 $ (4,540 ) $ 922 $ 470
Components Of Net Deferred Income Tax Liabilities	The components of the net deferred income tax liabilities as of September 30, 2018 and 2017 were as follows: 2018 2017 (Dollars in thousands) Deferred income tax assets: Salaries, deferred compensation and employee benefits $ 1,686 $ 2,583 Net purchase discounts related to acquired loans 1,456 — ESOP compensation 1,206 1,724 Unrealized loss on AFS securities 960 — Low income housing partnerships 874 1,478 ACL — 711 Other 3,154 2,621 Gross deferred income tax assets 9,336 9,117 Valuation allowance (1,822 ) (1,795 ) Gross deferred income tax asset, net of valuation allowance 7,514 7,322 Deferred income tax liabilities: FHLB stock dividends 15,550 23,242 Premises and equipment 5,983 6,105 Deposit intangible 2,567 — Unrealized gain on interest rate swap 2,353 — ACL 1,116 — Unrealized gain on AFS securities — 2,000 Other 1,198 433 Gross deferred income tax liabilities 28,767 31,780 Net deferred tax liabilities $ 21,253 $ 24,458

Employee Stock Ownership Plan (

Employee Stock Ownership Plan (Tables)	12 Months Ended
	Sep. 30, 2018
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 diversification (a participant may begin to diversify at least 25% of their ESOP shares at age 50 ), retirement, termination, or death of the participant. The following is a summary of shares held in the ESOP trust as of September 30, 2018 and 2017 : 2018 2017 (Dollars in thousands) Allocated ESOP shares 4,339,002 4,369,840 Unreleased ESOP shares 3,634,356 3,799,554 Total ESOP shares 7,973,358 8,169,394 Fair value of unreleased ESOP shares $ 46,302 $ 55,853

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Sep. 30, 2018
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, 2018 and 2017 : 2018 2017 (Dollars in thousands) Originate fixed-rate $ 46,645 $ 33,528 Originate adjustable-rate 25,228 9,861 Purchase/participate fixed-rate 122,418 74,104 Purchase/participate adjustable-rate 10,085 52,453 $ 204,376 $ 169,946

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Sep. 30, 2018
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 1.875% at September 30, 2018 and 1.25% at September 30, 2017 . At September 30, 2018 and 2017 , 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, 2018 , 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, 2018 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, 2018 Tier 1 leverage $ 1,202,125 13.0 % $ 370,559 4.0 % $ 463,199 5.0 % Common Equity Tier 1 ("CET1") capital 1,202,125 25.1 215,764 4.5 311,659 6.5 Tier 1 capital 1,202,125 25.1 287,685 6.0 383,580 8.0 Total capital 1,210,589 25.2 383,580 8.0 479,475 10.0 As of September 30, 2017 Tier 1 leverage 1,201,863 10.8 444,877 4.0 556,097 5.0 CET1 capital 1,201,863 27.2 199,181 4.5 287,706 6.5 Tier 1 capital 1,201,863 27.2 265,575 6.0 354,100 8.0 Total capital 1,210,261 27.3 354,100 8.0 442,625 10.0 Company As of September 30, 2018 Tier 1 leverage 1,381,791 14.9 370,475 4.0 N/A N/A CET1 capital 1,381,791 28.6 215,793 4.5 N/A N/A Tier 1 capital 1,381,791 28.8 287,724 6.0 N/A N/A Total capital 1,390,255 29.0 383,632 8.0 N/A N/A As of September 30, 2017 Tier 1 leverage 1,365,395 12.3 444,785 4.0 N/A N/A CET1 capital 1,365,395 30.8 199,195 4.5 N/A N/A Tier 1 capital 1,365,395 30.8 265,594 6.0 N/A N/A Total capital 1,373,793 31.0 354,125 8.0 N/A N/A

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Sep. 30, 2018
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, 2018 . September 30, 2018 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: MBS $ 445,090 $ — $ 445,090 $ — GSE debentures 265,398 — 265,398 — Municipal bonds 4,126 — 4,126 — 714,614 — 714,614 — Interest rate swaps 9,685 — 9,685 — $ 724,299 $ — $ 724,299 $ — 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 $ —
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: 2018 2017 Estimated Estimated Carrying Fair Carrying Fair Amount Value Amount Value (Dollars in thousands) Assets: Cash and cash equivalents $ 139,055 $ 139,055 $ 351,659 $ 351,659 AFS securities 714,614 714,614 415,831 415,831 HTM securities 612,318 601,071 827,738 833,009 Loans receivable 7,514,485 7,418,026 7,195,071 7,354,100 FHLB stock 99,726 99,726 100,954 100,954 Interest rate swaps 9,685 9,685 — — Liabilities: Deposits 5,603,354 5,569,591 5,309,868 5,318,249 FHLB borrowings 2,174,981 2,145,477 2,173,808 2,182,841 Other borrowings 110,052 109,465 200,000 202,004 Interest rate swaps — — 598 598

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	12 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables present the changes in the components of AOCI, net of tax, for the years ended September 30, 2018 and 2017 . During the year ended September 30, 2016 , 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, 2018 Unrealized Unrealized Gains (Losses) Gains (Losses) on AFS on Cash Flow Total Securities Hedges AOCI (dollars in thousands) Beginning balance $ 3,290 $ (372 ) $ 2,918 Other comprehensive income (loss), before reclassifications (6,741 ) 6,981 240 Amount reclassified from AOCI — 515 515 Other comprehensive income (loss) (6,741 ) 7,496 755 Reclassification of certain income tax effects related to adoption of ASU 2018-02 461 206 667 Ending balance $ (2,990 ) $ 7,330 $ 4,340 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) Beginning balance $ 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 ) Ending balance $ 3,290 $ (372 ) $ 2,918

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2018
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) 2018 Total interest and dividend income $ 80,644 $ 81,774 $ 82,161 $ 77,313 $ 321,892 Net interest and dividend income 49,374 49,889 49,433 50,077 198,773 Provision for credit losses — — — — — Net income 31,836 23,330 22,372 21,389 98,927 Basic EPS 0.24 0.17 0.17 0.16 0.73 Diluted EPS 0.24 0.17 0.17 0.16 0.73 Dividends declared per share 0.375 0.085 0.335 0.085 0.88 Average number of basic shares outstanding 134,373 134,428 134,484 135,500 134,698 Average number of diluted shares outstanding 134,467 134,475 134,530 135,556 134,759 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

Parent Company Financial Info_2

Parent Company Financial Information (Parent Company Only) (Tables)	12 Months Ended
	Sep. 30, 2018
Condensed Financial Information 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, 2018 and 2017 (Dollars in thousands, except per share amounts) 2018 2017 ASSETS: Cash and cash equivalents $ 137,684 $ 120,785 Investment in the Bank 1,221,706 1,204,781 Note receivable - ESOP 41,285 42,557 Other assets 690 365 Income taxes receivable, net 486 — TOTAL ASSETS $ 1,401,851 $ 1,368,488 LIABILITIES: Income taxes payable, net $ — $ 88 Junior subordinated debentures 10,052 — Accounts payable and accrued expenses 177 52 Deferred income tax liabilities, net — 35 Total liabilities 10,229 175 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, 141,225,516 and 138,223,835 shares issued and outstanding as of September 30, 2018 and 2017, respectively 1,412 1,382 Additional paid-in capital 1,207,644 1,167,368 Unearned compensation - ESOP (36,343 ) (37,995 ) Retained earnings 214,569 234,640 AOCI, net of tax 4,340 2,918 Total stockholders' equity 1,391,622 1,368,313 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 1,401,851 $ 1,368,488
Schedule Of Statements Of Income	STATEMENTS OF INCOME YEARS ENDED SEPTEMBER 30, 2018, 2017, and 2016 (Dollars in thousands) 2018 2017 2016 INTEREST AND DIVIDEND INCOME: Dividend income from the Bank $ 134,540 $ 120,215 $ 117,513 Interest income from other investments 1,951 1,715 1,725 Total interest and dividend income 136,491 121,930 119,238 INTEREST EXPENSE 62 — — NET INTEREST INCOME 136,429 121,930 119,238 NON-INTEREST EXPENSE: Salaries and employee benefits 1,031 896 827 Regulatory and outside services 1,129 247 261 Other non-interest expense 581 561 558 Total non-interest expense 2,741 1,704 1,646 INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 133,688 120,226 117,592 INCOME TAX (BENEFIT) EXPENSE (179 ) 4 28 INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY 133,867 120,222 117,564 EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY (34,940 ) (36,085 ) (34,070 ) NET INCOME $ 98,927 $ 84,137 $ 83,494
Schedule Of Statements Of Cash Flows	STATEMENTS OF CASH FLOWS YEARS ENDED SEPTEMBER 30, 2018, 2017, and 2016 (Dollars in thousands) 2018 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 98,927 $ 84,137 $ 83,494 Adjustments to reconcile net income to net cash provided by operating activities: Equity in excess of distribution over earnings of subsidiary 34,940 36,085 34,070 Depreciation of equipment 30 29 30 Provision for deferred income taxes (35 ) (2 ) 2 Changes in: Other assets (53 ) (5 ) 1 Income taxes receivable/payable (145 ) (40 ) 445 Accounts payable and accrued expenses (257 ) (22 ) 14 Net cash provided by operating activities 133,407 120,182 118,056 CASH FLOWS FROM INVESTING ACTIVITIES: Principal collected on notes receivable from ESOP 1,272 1,233 1,194 Cash acquired from acquisition 18 — — Net cash provided by investing activities 1,290 1,233 1,194 CASH FLOWS FROM FINANCING ACTIVITIES: Net payment from subsidiary related to restricted stock awards 253 293 473 Cash dividends paid (118,312 ) (117,963 ) (111,767 ) Stock options exercised 261 8,843 4,070 Net cash used in financing activities (117,798 ) (108,827 ) (107,224 ) NET INCREASE IN CASH AND CASH EQUIVALENTS 16,899 12,588 12,026 CASH AND CASH EQUIVALENTS: Beginning of year 120,785 108,197 96,171 End of year $ 137,684 $ 120,785 $ 108,197 SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES: Common stock issued for acquisition $ 39,113 $ — $ — Capital contribution to subsidiary in conjunction with acquisition of CCB $ 48,798 $ — $ —

Summary Of Significant Accoun_3

Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)
Summary Of Significant Accounting Policies [Line Items]
Interest-bearing deposits held at the Federal Reserve Bank	$ 120.8	$ 337.5
Average daily balance of required reserves at the Federal Reserve Bank	$ 11	$ 9.1
Capital City Bancshares, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Other intangible assets, estimated life	8 years
Traditional Banking Offices [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of Stores	48
In-Store Banking Offices [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of Stores	10

Acquisition (Narrative) (Detail

Acquisition (Narrative) (Details) - Capital City Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	Aug. 31, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Fair value of loans acquired	$ 299,700
Fair value of deposits acquired	352,500
PCI loans, contractually required payments receivable at acquisition	2,600
PCI loans, cash flows expected to be collected at acquisition	$ 1,900
Number of common stock shares issued	3
Total merger consideration	$ 39,100
Closing stock price	$ 13.21
Regulatory and Outside Services [Member]
Business Acquisition [Line Items]
Merger-related expenses incurred		$ 872

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Net income	$ 21,389	$ 22,372	$ 23,330	$ 31,836	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 98,927	$ 84,137	$ 83,494
Income allocated to participating securities									(40)	(44)	(66)
Net income available to common stockholders									$ 98,887	$ 84,093	$ 83,428
Total basic average common shares outstanding	135,500,000	134,484,000	134,428,000	134,373,000	134,314,000	134,254,000	134,066,000	133,697,000	134,698,344	134,082,420	133,045,215
Effect of dilutive stock options									60,647	161,442	131,161
Total diluted average common shares outstanding	135,556,000	134,530,000	134,475,000	134,467,000	134,404,000	134,360,000	134,259,000	133,950,000	134,758,991	134,243,862	133,176,376
Net EPS:
Basic	$ 0.16	$ 0.17	$ 0.17	$ 0.24	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.73	$ 0.63	$ 0.63
Diluted	$ 0.16	$ 0.17	$ 0.17	$ 0.24	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.73	$ 0.63	$ 0.63
Antidilutive stock options, excluded from the diluted average common shares outstanding calculation									541,418	200,800	886,417
Average Common Shares Outstanding [Member]
Earnings Per Share
Total basic average common shares outstanding									134,635,886	134,019,962	132,982,815
Average Committed ESOP Shares Outstanding [Member]
Earnings Per Share
Total basic average common shares outstanding									62,458	62,458	62,400

Securities (Narrative) (Details

Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Marketable Securities [Abstract]
Other than temporary impairments, amount	$ 0	$ 0
Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds received from sale of AFS securities	2,100
Gain on sale of AFS securities	$ 9

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, 2018	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 612,318	$ 827,738
Held-to-maturity Securities, Gross Unrealized Gains	4,514	10,579
Held-to-maturity Securities, Gross Unrealized Losses	15,761	5,308
Held-to-maturity securities, Estimated Fair Value	601,071	833,009
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	718,564	410,541
Available-for-sale Securities, Gross Unrealized Gains	3,300	5,944
Available-for-sale Securities, Gross Unrealized Losses	7,250	654
Available-for-sale Securities, Estimated Fair Value	714,614	415,831
MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	591,900	800,931
Held-to-maturity Securities, Gross Unrealized Gains	4,514	10,460
Held-to-maturity Securities, Gross Unrealized Losses	15,589	5,295
Held-to-maturity securities, Estimated Fair Value	580,825	806,096
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	445,883	135,644
Available-for-sale Securities, Gross Unrealized Gains	3,270	5,923
Available-for-sale Securities, Gross Unrealized Losses	4,063	51
Available-for-sale Securities, Estimated Fair Value	445,090	141,516
GSE Debentures [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	268,525	271,300
Available-for-sale Securities, Gross Unrealized Gains	30	16
Available-for-sale Securities, Gross Unrealized Losses	3,157	587
Available-for-sale Securities, Estimated Fair Value	265,398	270,729
Trust Preferred Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		2,067
Available-for-sale Securities, Gross Unrealized Gains		0
Available-for-sale Securities, Gross Unrealized Losses		16
Available-for-sale Securities, Estimated Fair Value		2,051
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	20,418	26,807
Held-to-maturity Securities, Gross Unrealized Gains	0	119
Held-to-maturity Securities, Gross Unrealized Losses	172	13
Held-to-maturity securities, Estimated Fair Value	20,246	26,913
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	4,156	1,530
Available-for-sale Securities, Gross Unrealized Gains	0	5
Available-for-sale Securities, Gross Unrealized Losses	30	0
Available-for-sale Securities, Estimated Fair Value	$ 4,126	$ 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, 2018	Sep. 30, 2017
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	$ 430,424	$ 234,069
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	5,058	585
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	156,178	27,676
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	2,192	69
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	76,578	264,838
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	1,075	1,590
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	363,491	202,554
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	14,686	3,718
GSE Debentures [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	101,735	224,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	1,231	539
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	148,049	24,952
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	1,926	48
MBS [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	324,563	9,648
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	3,797	46
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	8,129	673
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	266	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	58,233	259,200
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	904	1,582
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	362,806	201,094
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	14,685	3,713
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value		2,051
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses		16
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	4,126
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	30
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Estimated Fair Value	18,345	5,638
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	171	8
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Estimated Fair Value	685	1,460
Held-to-maturity Securities, Continuous Unrealized Loss Position, Equal to or Greater Than 12 Months, Unrealized Losses	$ 1	$ 5

Securities (Schedule Of Contrac

Securities (Schedule Of Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	$ 718,564	$ 410,541
Available-for-sale Securities, Estimated Fair Value	714,614	415,831
Held-to-maturity Securities, Amortized Cost	612,318	827,738
Held-to-maturity Securities, Estimated Fair Value	601,071	833,009
Debt Securities [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, One year or less, Amortized Cost	54,627
Available-for-sale Securities, One year through five years, Amortized Cost	218,054
Available-for-sale Securities, Amortized Cost	272,681
Available-for-sale Securities, One year or less, Estimated Fair Value	54,476
Available-for-sale Securities, One year through five years, Estimated Fair Value	215,048
Available-for-sale Securities, Estimated Fair Value	269,524
Held-to-maturity Securities, One year or less, Amortized Cost	4,161
Held-to-maturity Securities, One year through five years, Amortized Cost	16,257
Held-to-maturity Securities, Amortized Cost	20,418
Held-to-maturity Securities, One year or less, Estimated Fair Value	4,152
Held-to-maturity Securities, One year through five years, Estimated Fair Value	16,094
Held-to-maturity Securities, Estimated Fair Value	20,246
MBS [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Amortized Cost	445,883	135,644
Available-for-sale Securities, Estimated Fair Value	445,090	141,516
Held-to-maturity Securities, Amortized Cost	591,900	800,931
Held-to-maturity Securities, Estimated Fair Value	$ 580,825	$ 806,096

Securities (Schedule Of Taxable

Securities (Schedule Of Taxable And Non-taxable Components Of Interest Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Marketable Securities [Abstract]
Taxable	$ 4,275	$ 3,847	$ 5,255
Non-taxable	395	515	670
Interest income on investment securities	$ 4,670	$ 4,362	$ 5,925

Securities (Schedule Of Carryin

Securities (Schedule Of Carrying Value Of Securities Pledged As Collateral) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Marketable Securities [Abstract]
Public unit deposits	$ 515,553	$ 499,993
Repurchase agreements	108,360	214,298
FRB of Kansas City	9,529	11,769
Total securities pledged as collateral	$ 633,442	$ 726,060

Loans Receivable And Allowanc_3

Loans Receivable And Allowance For Credit Losses (Narrative) (Details) $ in Thousands	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)
Loans Receivable [Line Items]
Loans receivable, gross	$ 7,507,645	$ 7,182,751
PCI Loans	2,400
Outstanding discounts	33,933	24,962
Serviced loans for others, aggregate amount	134,200	101,200
Escrow balances on loans serviced for others	$ 2,400	2,100
Loan-to-value ratio securing commercial real estate loans, maximum	80.00%
Debt service coverage ratio for commercial real estate loans, minimum	1.20
Recorded investment of loans in process of foreclosure	$ 2,900	4,300
Carrying value of residential OREO	1,300	1,400
Loans receivable	7,514,485	7,195,071
ACL maintained for impaired loans	0	0
ACL maintained for loans individually evaluated for impairment	0	0
PCI Loans [Member]
Loans Receivable [Line Items]
Outstanding discounts	516
Non-PCI Loans [Member]
Loans Receivable [Line Items]
Loans receivable, gross	296,500
Outstanding discounts	5,500
Doubtful [Member]
Loans Receivable [Line Items]
Loans receivable	$ 0	$ 0

Loans Receivable And Allowanc_4

Loans Receivable And Allowance For Credit Losses (Summary Of Loans Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Loans Receivable [Line Items]
Loans receivable, gross	$ 7,507,645	$ 7,182,751
ACL	8,463	8,398
Discounts/unearned loan fees	33,933	24,962
Premiums/deferred costs	(49,236)	(45,680)
Loans receivable, net	7,514,485	7,195,071
One- to Four-Family Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	6,798,435	6,786,895
One- to Four-Family Segment [Member] | Originated [Member]
Loans Receivable [Line Items]
Loans receivable, gross	3,965,692	3,959,232
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Loans Receivable [Line Items]
Loans receivable, gross	2,505,987	2,445,311
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Loans Receivable [Line Items]
Loans receivable, gross	293,607	351,705
One- to Four-Family Segment [Member] | Construction [Member]
Loans Receivable [Line Items]
Loans receivable, gross	33,149	30,647
Commercial Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	569,610	269,982
Commercial Segment [Member] | Construction [Member]
Loans Receivable [Line Items]
Loans receivable, gross	80,498	86,952
Commercial Segment [Member] | Commercial Real Estate [Member]
Loans Receivable [Line Items]
Loans receivable, gross	426,243	183,030
Commercial Segment [Member] | Commercial and Industrial [Member]
Loans Receivable [Line Items]
Loans receivable, gross	62,869	0
Consumer Segment [Member]
Loans Receivable [Line Items]
Loans receivable, gross	139,600	125,874
Consumer Segment [Member] | Home Equity [Member]
Loans Receivable [Line Items]
Loans receivable, gross	129,588	122,066
Consumer Segment [Member] | Other [Member]
Loans Receivable [Line Items]
Loans receivable, gross	$ 10,012	$ 3,808

Loans Receivable And Allowanc_5

Loans Receivable And Allowance For Credit Losses (Recorded Investment in Loans, Past Due) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	$ 27,916	$ 28,205
Financing receivable, current loans	7,495,032	7,175,264
Financing receivable, total recorded investment	7,522,948	7,203,469
Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	18,839	18,804
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	9,077	9,401
One- to Four-Family Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total recorded investment	6,820,187	6,808,616
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	15,638	18,716
Financing receivable, current loans	3,968,362	3,956,598
Financing receivable, total recorded investment	3,984,000	3,975,314
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	10,613	13,216
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	5,025	5,500
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	4,304	1,947
Financing receivable, current loans	2,536,913	2,477,916
Financing receivable, total recorded investment	2,541,217	2,479,863
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	3,846	1,855
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	458	92
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	6,584	6,632
Financing receivable, current loans	288,386	346,807
Financing receivable, total recorded investment	294,970	353,439
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	3,521	3,233
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	3,063	3,399
Commercial Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total recorded investment	563,513	268,979
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	76	0
Financing receivable, current loans	501,932	268,979
Financing receivable, total recorded investment	502,008	268,979
Commercial Segment [Member] | Commercial Real Estate [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	76	0
Commercial Segment [Member] | Commercial Real Estate [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
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	250	0
Financing receivable, current loans	61,255	0
Financing receivable, total recorded investment	61,505	0
Commercial Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	250	0
Commercial Segment [Member] | Commercial and Industrial [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	139,248	125,874
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	993	873
Financing receivable, current loans	128,351	121,193
Financing receivable, total recorded investment	129,344	122,066
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	472	467
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	521	406
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, total delinquent loans	71	37
Financing receivable, current loans	9,833	3,771
Financing receivable, total recorded investment	9,904	3,808
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	61	33
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	$ 10	$ 4

Loans Receivable And Allowanc_6

Loans Receivable And Allowance For Credit Losses (Recorded Investment in Loans, Nonaccrual) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 10,969	$ 16,645
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	6,503	10,054
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	863	1,804
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	3,063	4,264
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	0	0
Commercial Segment [Member] | Commercial and Industrial [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	530	519
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 10	$ 4

Loans Receivable And Allowanc_7

Loans Receivable And Allowance For Credit Losses (Recorded Investment In Classified Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	$ 7,522,948	$ 7,203,469
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	12,332	7,301
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	35,002	42,900
One- to Four-Family Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	6,820,187	6,808,616
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	3,984,000	3,975,314
One- to Four-Family Segment [Member] | Originated [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	8,660	7,031
One- to Four-Family Segment [Member] | Originated [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	22,409	30,059
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	2,541,217	2,479,863
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	997	261
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	3,126	3,800
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	294,970	353,439
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	7,195	8,005
Commercial Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	563,513	268,979
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	502,008	268,979
Commercial Segment [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	1,251	0
Commercial Segment [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	1,368	0
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	61,505	0
Commercial Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	1,126	0
Commercial Segment [Member] | Commercial and Industrial [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	139,248	125,874
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	129,344	122,066
Consumer Segment [Member] | Home Equity [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	298	9
Consumer Segment [Member] | Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	894	1,032
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	9,904	3,808
Consumer Segment [Member] | Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	0	0
Consumer Segment [Member] | Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, total recorded investment	$ 10	$ 4

Loans Receivable And Allowanc_8

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) - credit_score	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	765	765
Weighted average LTV	63.00%	64.00%
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	767	767
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	67.00%	68.00%
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	758	757
Weighted average LTV	62.00%	63.00%
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	750	755
Weighted average LTV	22.00%	19.00%

Loans Receivable And Allowanc_9

Loans Receivable And Allowance For Credit Losses (Troubled Debt Restructurings On Financing Receivables) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	7	144	157
Pre-Restructured Outstanding	$ 670	$ 15,782	$ 20,824
Post-Restructured Outstanding	$ 687	$ 16,289	$ 21,211
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5	112	122
Pre-Restructured Outstanding	$ 264	$ 11,940	$ 17,201
Post-Restructured Outstanding	$ 281	$ 12,402	$ 17,557
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	12	12
Pre-Restructured Outstanding	$ 406	$ 2,443	$ 2,592
Post-Restructured Outstanding	$ 406	$ 2,459	$ 2,619
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	3	3
Pre-Restructured Outstanding	$ 0	$ 1,031	$ 596
Post-Restructured Outstanding	$ 0	$ 1,048	$ 594
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	0
Pre-Restructured Outstanding	$ 0	$ 0	$ 0
Post-Restructured Outstanding	$ 0	$ 0	$ 0
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	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 | contract	0	17	19
Pre-Restructured Outstanding	$ 0	$ 368	$ 427
Post-Restructured Outstanding	$ 0	$ 380	$ 433
Consumer Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	1
Pre-Restructured Outstanding	$ 0	$ 0	$ 8
Post-Restructured Outstanding	$ 0	$ 0	$ 8

Loans Receivable And Allowan_10

Loans Receivable And Allowance For Credit Losses (Troubled Debt Restructurings On Financing Receivables That Subsequently Defaulted) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	30	66	57
Recorded Investment | $	$ 2,713	$ 5,847	$ 6,052
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	22	46	48
Recorded Investment | $	$ 1,416	$ 4,561	$ 5,330
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	2	3
Recorded Investment | $	$ 124	$ 148	$ 548
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	2	0
Recorded Investment | $	$ 1,040	$ 698	$ 0
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4	16	6
Recorded Investment | $	$ 133	$ 440	$ 174
Consumer Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0

Loans Receivable And Allowan_11

Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Instant Related Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 28,040	$ 42,229
Unpaid Principal Balance	29,877	44,351
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	18,857	30,251
Unpaid Principal Balance	19,388	30,953
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,668	3,800
Unpaid Principal Balance	2,768	3,771
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,011	7,403
Unpaid Principal Balance	6,976	8,606
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	504	775
Unpaid Principal Balance	720	997
Consumer Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	$ 25	$ 24

Loans Receivable And Allowan_12

Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Duration Related Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	$ 34,077	$ 38,315	$ 24,221
Average Recorded Investment, Allowance Recorded	0	15,114	29,995
Average Recorded Investment	34,077	53,429	54,216
Interest Income Recognized, No Related Allowance	1,332	1,315	778
Interest Income Recognized, Allowance Recorded	0	556	1,125
Interest Income Recognized	1,332	1,871	1,903
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	23,847	24,122	12,063
Average Recorded Investment, Allowance Recorded	0	11,469	24,199
Average Recorded Investment	23,847	35,591	36,262
Interest Income Recognized, No Related Allowance	990	917	470
Interest Income Recognized, Allowance Recorded	0	434	983
Interest Income Recognized	990	1,351	1,453
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	3,204	3,346	495
Average Recorded Investment, Allowance Recorded	0	2,018	2,669
Average Recorded Investment	3,204	5,364	3,164
Interest Income Recognized, No Related Allowance	112	118	18
Interest Income Recognized, Allowance Recorded	0	65	50
Interest Income Recognized	112	183	68
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	6,438	9,852	11,022
Average Recorded Investment, Allowance Recorded	0	1,160	2,219
Average Recorded Investment	6,438	11,012	13,241
Interest Income Recognized, No Related Allowance	191	194	196
Interest Income Recognized, Allowance Recorded	0	20	27
Interest Income Recognized	191	214	223
Commercial Segment [Member] | Commercial Real Estate [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
Commercial Segment [Member] | Commercial and Industrial [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	588	988	628
Average Recorded Investment, Allowance Recorded	0	457	895
Average Recorded Investment	588	1,445	1,523
Interest Income Recognized, No Related Allowance	39	86	93
Interest Income Recognized, Allowance Recorded	0	36	64
Interest Income Recognized	39	122	157
Consumer Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	0	7	13
Average Recorded Investment, Allowance Recorded	0	10	13
Average Recorded Investment	0	17	26
Interest Income Recognized, No Related Allowance	0	0	1
Interest Income Recognized, Allowance Recorded	0	1	1
Interest Income Recognized	$ 0	$ 1	$ 2

Loans Receivable And Allowan_13

Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 8,398	$ 8,540	$ 9,443
Charge-offs	(302)	(348)	(630)
Recoveries	367	206	477
Provision for credit losses	0	0	(750)
Ending Balance	8,463	8,398	8,540
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	6,095	7,095	8,414
Charge-offs	(264)	(288)	(542)
Recoveries	340	169	451
Provision for credit losses	(432)	(881)	(1,228)
Ending Balance	5,739	6,095	7,095
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,173	3,928	4,865
Charge-offs	(136)	(72)	(200)
Recoveries	144	4	77
Provision for credit losses	(228)	(687)	(814)
Ending Balance	2,953	3,173	3,928
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,922	2,102	2,115
Charge-offs	(128)	0	0
Recoveries	0	0	0
Provision for credit losses	67	(180)	(13)
Ending Balance	1,861	1,922	2,102
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,000	1,065	1,434
Charge-offs	0	(216)	(342)
Recoveries	196	165	374
Provision for credit losses	(271)	(14)	(401)
Ending Balance	925	1,000	1,065
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,112	1,208	742
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for credit losses	444	904	466
Ending Balance	2,556	2,112	1,208
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	191	237	287
Charge-offs	(38)	(60)	(88)
Recoveries	27	37	26
Provision for credit losses	(12)	(23)	12
Ending Balance	$ 168	$ 191	$ 237

Loans Receivable And Allowan_14

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, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	$ 7,494,908	$ 7,161,240
Recorded investment in loans individually evaluated for impairment	28,040	42,229
Financing receivable, total recorded investment	7,522,948	7,203,469
ACL for loans collectively evaluated for impairment	8,463	8,398
One- to Four-Family Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	6,792,651	6,767,161
Recorded investment in loans individually evaluated for impairment	27,536	41,455
Financing receivable, total recorded investment	6,820,187	6,808,616
ACL for loans collectively evaluated for impairment	5,739	6,095
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	3,965,143	3,945,063
Recorded investment in loans individually evaluated for impairment	18,857	30,251
Financing receivable, total recorded investment	3,984,000	3,975,314
ACL for loans collectively evaluated for impairment	2,953	3,173
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	2,538,549	2,476,063
Recorded investment in loans individually evaluated for impairment	2,668	3,800
Financing receivable, total recorded investment	2,541,217	2,479,863
ACL for loans collectively evaluated for impairment	1,861	1,922
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	288,959	346,035
Recorded investment in loans individually evaluated for impairment	6,011	7,404
Financing receivable, total recorded investment	294,970	353,439
ACL for loans collectively evaluated for impairment	925	1,000
Commercial Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	563,513	268,979
Recorded investment in loans individually evaluated for impairment	0	0
Financing receivable, total recorded investment	563,513	268,979
ACL for loans collectively evaluated for impairment	2,556	2,112
Consumer Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment in loans collectively evaluated for impairment	138,744	125,100
Recorded investment in loans individually evaluated for impairment	504	774
Financing receivable, total recorded investment	139,248	125,874
ACL for loans collectively evaluated for impairment	$ 168	$ 191

Premises And Equipment (Narrati

Premises And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment, Net [Abstract]
Rental expense	$ 1.2	$ 1.1	$ 1.2

Premises And Equipment (Summary

Premises And Equipment (Summary Of The Carrying Value Of Banking Premises And Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 169,968	$ 151,481
Accumulated depreciation, property, plant and equipment	73,963	66,663
Property, plant and equipment, net	96,005	84,818
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,536	11,670
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	107,580	96,401
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 48,852	$ 43,410

Premises And Equipment (Schedul

Premises And Equipment (Schedule Of Future Minimum Rental Commitments) (Details) $ in Thousands	Sep. 30, 2018USD ($)
Property, Plant and Equipment, Net [Abstract]
2,019	$ 1,364
2,020	1,067
2,021	941
2,022	828
2,023	689
Thereafter	1,573
Future minimum rental commitments, total	$ 6,462

Low Income Housing Partnershi_2

Low Income Housing Partnerships (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Investments in Affordable Housing Projects [Abstract]
Investment In affordable housing limited partnerships		$ 74,500,000	$ 66,100,000
Obligations related to investments in affordable housing limited partnerships		$ 34,000,000	29,400,000
Affordable housing tax credits commitment, year to be paid		2,021
Proportional amortization expense, amount		$ 7,000,000	4,400,000
Affordable housing tax credits, amount		7,500,000	6,900,000	$ 6,000,000
Net income tax benefit, low income housing partnerships		500,000	2,500,000
Impairment losses from the forfeiture or ineligibility of tax credits or other circumstances, amount	$ 0	$ 0	$ 0	$ 0

Intangible Assets (Narrative) (

Intangible Assets (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)
Business Acquisition [Line Items]
Goodwill, impairment recorded	$ 0
Capital City Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Goodwill recognized upon acquisition of CCB	7,989
Other intangible assets recognized upon acquisition of CCB	$ 10,052
Other intangible assets, estimated life	8 years

Intangible Assets (Schedule of

Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Schedule of Goodwill and Intangible Assets [Line Items]
Core Deposit and Other Intangibles, Amortization	$ (234)	$ 0	$ 0
Capital City Bancshares, Inc. [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning Balance	0
Goodwill, Acquired During Period	7,989
Goodwill, Amortization	0
Goodwill, Ending Balance	7,989	0
Core Deposit and Other Intangibles, Beginning Balance	0
Core Deposit and Other Intangibles, Acquired During Period	10,052
Core Deposit and Other Intangibles, Amortization	(234)
Core Deposit and Other Intangibles, Ending Balance	$ 9,819	$ 0

Intangible Assets Intangible As

Intangible Assets Intangible Assets (Schedule of Core Deposit and Other Intangible Assets, Future Amortization Expense) (Details) $ in Thousands	Sep. 30, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,019	$ 2,317
2,020	1,964
2,021	1,659
2,022	1,358
2,023	$ 1,056

Deposits and Borrowed Funds (Na

Deposits and Borrowed Funds (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Noninterest-bearing deposits	$ 336,500	$ 243,700
Time Deposits, $250,000 or more	668,800	676,100
FHLB borrowings, outstanding balance	2,174,981	2,173,808
FHLB Advances, Fixed Rate	1,600,000	1,980,000
FHLB Advances, Variable Rate	475,000	200,000
FHLB line of credit, outstanding balance	$ 100,000	0
Expiration date for FHLB line of credit	Nov. 15, 2019
Interest rate swaps, notional amount	$ 475,000
Interest rate swaps, notional amount		$ 200,000
Interest rate swaps, remaining term to maturity	5 years 10 months 3 days	5 years 10 months 12 days
Interest rate swaps, fair value	$ 9,700	$ (598)
Interest rate swaps, amount reclassified from AOCI	515	134
Interest rate swaps, future amount to be reclassified from AOCI	(755)
Interest rate swaps, amount of hedge ineffectiveness recognized	0
Interest rate swaps, collateral held	$ (10,000)
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	23.00%
Repurchase agreements	$ 100,000
Weighted average rate of repurchase agreements	2.53%	2.94%
Repurchase Agreements, Description of Potential Risks	See Note 4 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.
Common equity securities issued by the Trusts	$ 302
Leverage Strategy [Member]
FHLB line of credit available for leverage strategy, maximum	2,100,000
FHLB Advances [Member]
FHLB borrowings, outstanding balance	2,074,981	$ 2,173,808
Subordinated Debentures Subject to Mandatory Redemption [Member]
Junior subordinated debentures	10,100
Subordinated Debentures Subject to Mandatory Redemption [Member] | Capital City Statutory Trust I [Member]
Junior subordinated debentures	$ 6,200
Effective interest rate	10.60%
Maturity date	Sep. 7, 2030
Subordinated Debentures Subject to Mandatory Redemption [Member] | Capital City Statutory Trust II [Member]
Junior subordinated debentures	$ 3,900
Effective interest rate	5.82%
Maturity date	Jun. 26, 2032
Variable rate basis	three-month London Interbank Offered Rate ("LIBOR")
Interest rate spread over variable rate basis	3.45%

Deposits and Borrowed Funds (FH

Deposits and Borrowed Funds (FHLB Advances) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Sep. 30, 2017
Debt [Line Items]
FHLB advances		$ 2,075,000	$ 2,175,000
Deferred prepayment penalty		(19)	(1,192)
FHLB advances, outstanding balance		$ 2,174,981	$ 2,173,808
Weighted Average [Member]
Debt [Line Items]
Weighted average contractual interest rate on FHLB advances		2.07%	1.96%
Weighted average effective interest rate on FHLB advances	[1]	2.12%	2.09%
FHLB Advances [Member]
Debt [Line Items]
FHLB advances, outstanding balance		$ 2,074,981	$ 2,173,808
[1]	The effective interest rate includes the net impact of deferred amounts and interest rate swaps related to the adjustable-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, 2018	Sep. 30, 2017
Deposits and Borrowed Funds [Abstract]
FHLB Advances Due in 2019	$ 875,000
FHLB Advances Due in 2020	350,000
FHLB Advances Due in 2021	550,000
FHLB Advances Due in 2022	200,000
FHLB Advances Due in 2023	100,000
FHLB Advances Due Thereafter	0
FHLB Advances Amount	2,075,000	$ 2,175,000
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 in 2023	0
Repurchase Agreements Due Thereafter	0
Repurchase Agreements Amount	100,000
Certificates of Deposit Due in 2019	1,229,859
Certificates of Deposit Due in 2020	812,885
Certificates of Deposit Due in 2021	372,331
Certificates of Deposit Due in 2022	401,527
Certificates of Deposit Due in 2023	119,313
Certificates of Deposit Due Thereafter	1,142
Certificates of Deposit Amount	$ 2,937,057

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal corporate income tax rate	35.00%	21.00%			24.50%	24.50%	35.00%	35.00%
Revaluation of net deferred tax liability	$ (7,500,000)			$ (7,498,000)			$ 0	$ 0
Impairment of low income housing partnership investments	$ 0			0			$ 0	$ 0
Effective income tax rate					20.20%		34.20%	31.50%
Valuation allowance		$ 1,822,000	$ 1,822,000	1,822,000	$ 1,822,000	$ 1,822,000	$ 1,795,000
Unrecognized tax benefits		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Open tax year			2,015

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Current, Federal	$ 26,007	$ 38,127	$ 33,298
Current, State	3,512	4,734	4,677
Current income tax expense	29,519	42,861	37,975
Deferred, Federal	(5,956)	712	286
Deferred, State	1,416	210	184
Deferred income tax expense	(4,540)	922	470
Income tax expense	$ 24,979	$ 43,783	$ 38,445

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	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal income tax expense computed at statutory Federal rate, Amount			$ 30,392			$ 44,772	$ 42,679
Federal income tax expense computed at statutory Federal rate, Percentage	35.00%	21.00%		24.50%	24.50%	35.00%	35.00%
Increases (Decreases) In Taxes Resulting From:
State taxes, net of Federal tax effect, Amount			3,986			$ 3,452	$ 3,308
State taxes, net of Federal tax effect, Percentage				3.20%		2.70%	2.70%
Deferred tax liability remeasurement, net, Amount	$ (7,500)		(7,498)			$ 0	$ 0
Deferred tax liability remeasurement, net, Percentage				(6.00%)		0.00%	0.00%
Low income housing tax credits, presented net of proportional amortization in 2018 and 2017, Amount			(500)			$ (2,468)	$ (4,815)
Low income housing tax credits, presented net of proportional amortization in 2018 and 2017, Percentage				(0.40%)		(2.00%)	(4.00%)
ESOP related expenses, net, Amount			(790)			$ (1,052)	$ (1,127)
ESOP related expenses, net, Percentage				(0.60%)		(0.80%)	(0.90%)
Other, Amount			(611)			$ (921)	$ (1,600)
Other, Percentage				(0.50%)		(0.70%)	(1.30%)
Income tax expense			$ 24,979			$ 43,783	$ 38,445
Income tax expense, Percentage				20.20%		34.20%	31.50%

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, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
ACL	$ 1,827	$ 185	$ 480
Salaries, deferred compensation and employee benefits	897	437	(143)
Low income housing partnerships	604	285	(318)
FHLB stock dividends	(7,692)	4	(1,357)
Premises and equipment	(122)	14	1,593
Other, net	(54)	(3)	215
Deferred income tax expense	$ (4,540)	$ 922	$ 470

Income Taxes (Components Of Net

Income Taxes (Components Of Net Deferred Income Tax (Liabilities) Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deferred income tax assets:
Salaries, deferred compensation and employee benefits	$ 1,686	$ 2,583
Net purchase discounts related to acquired loans	1,456	0
ESOP compensation	1,206	1,724
Unrealized loss on AFS securities	960	0
Low income housing partnerships	874	1,478
ACL	0	711
Other	3,154	2,621
Gross deferred income tax assets	9,336	9,117
Valuation allowance	(1,822)	(1,795)
Gross deferred income tax asset, net of valuation allowance	7,514	7,322
Deferred income tax liabilities:
FHLB stock dividends	15,550	23,242
Premises and equipment	5,983	6,105
Deposit intangible	2,567	0
Unrealized gain on interest rate swap	2,353	0
ACL	1,116	0
Unrealized gain on AFS securities	0	2,000
Other	1,198	433
Gross deferred income tax liabilities	28,767	31,780
Net deferred tax liabilities	$ 21,253	$ 24,458

Employee Stock Ownership Plan_2

Employee Stock Ownership Plan (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)shares	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2019shares
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 | $	$ 2,900	$ 3,300	$ 3,000
Portion of compensation expense related to the ESOP attributable to changes in Company stock price | $	541	784	522
Dividends on unallocated ESOP shares in excess of debt service payments | $	$ 688	$ 833	$ 813
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 Plan_3

Employee Stock Ownership Plan (Summary Of Shares Held In The ESOP Trust) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated ESOP shares	4,339,002	4,369,840
Unreleased ESOP shares	3,634,356	3,799,554
Total ESOP shares	7,973,358	8,169,394
Fair value of unreleased ESOP shares	$ 46,302	$ 55,853

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding at end of year, number of options	1,210,374
Options outstanding at end of year, weighted average exercise price	$ 13.33
Options outstanding at end of year, weighted average remaining contractual life (in years)	4 years 3 months 22 days
Options exercisable at end of year, number of options	1,161,374
Options exercisable at end of year, weighted average exercise price	$ 13.37
Options exercisable at end of year, weighted average remaining contractual life (in years)	4 years 2 months 12 days
Unvested restricted stock at end of year, number of shares	53,150
Unvested restricted stock at end of year, weighted average grant date fair value	$ 13.48
Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 71	$ 118	$ 335
Fair value of stock options vested during the period	77	174	652
Unrecognized total future compensation cost, net of forfeitures	$ 61
Unrecognized total future compensation cost weighted average recognition period	1 year 2 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	504,195
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	$ 301	388	787
Unrecognized total future compensation cost	572
Fair value of restricted stock vested during the period	$ 294	$ 563	$ 1,600
Unrecognized total future compensation cost weighted average recognition period	2 years 8 months 19 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	1,738,750
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 Contingencies_2

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Unadvanced lines of credit	$ 246.1	$ 240
Standby letters of credit outstanding	$ 1.2

Commitments And Contingencies_3

Commitments And Contingencies (Commitments Outstanding To Originate, Purchase, Or Participate In Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Originate fixed-rate	$ 46,645	$ 33,528
Originate adjustable-rate	25,228	9,861
Purchase/participate fixed-rate	122,418	74,104
Purchase/participate adjustable-rate	10,085	52,453
Commitments outstanding to originate, purchase, or participate in loans	$ 204,376	$ 169,946

Regulatory Capital Requiremen_3

Regulatory Capital Requirements Regulatory Capital Requirements (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Regulatory Capital Requirements [Abstract]
Liquidation account balance	$ 145.4
Capital Conservation Buffer, Annual Increase	0.625%
Required Capital Conservation Buffer	1.875%	1.25%
Capital Conservation Buffer, Fully Phased-In Percentage	2.50%

Regulatory Capital Requiremen_4

Regulatory Capital Requirements (Summary Of Capital And Total Risk-Based Capital Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Capitol Federal Financial Inc [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage, Actual Amount	$ 1,381,791	$ 1,365,395
Tier 1 leverage, Actual Ratio	14.90%	12.30%
Tier 1 leverage, For Capital Adequacy Purposes, Amount	$ 370,475	$ 444,785
Tier 1 leverage, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
CET1 capital, Actual Amount	$ 1,381,791	$ 1,365,395
CET1 capital, Actual Ratio	28.60%	30.80%
CET1 capital, For Capital Adequacy Purposes, Amount	$ 215,793	$ 199,195
CET1 capital, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tier 1 capital, Actual Amount	$ 1,381,791	$ 1,365,395
Tier 1 capital, Actual Ratio	28.80%	30.80%
Tier 1 capital, For Capital Adequacy Purposes, Amount	$ 287,724	$ 265,594
Tier 1 capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Total capital, Actual Amount	$ 1,390,255	$ 1,373,793
Total capital, Actual Ratio	29.00%	31.00%
Total capital, For Capital Adequacy Purposes, Amount	$ 383,632	$ 354,125
Total capital, 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, Actual Amount	$ 1,202,125	$ 1,201,863
Tier 1 leverage, Actual Ratio	13.00%	10.80%
Tier 1 leverage, For Capital Adequacy Purposes, Amount	$ 370,559	$ 444,877
Tier 1 leverage, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 463,199	$ 556,097
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
CET1 capital, Actual Amount	$ 1,202,125	$ 1,201,863
CET1 capital, Actual Ratio	25.10%	27.20%
CET1 capital, For Capital Adequacy Purposes, Amount	$ 215,764	$ 199,181
CET1 capital, For Capital Adequacy Purposes, Ratio	4.50%	4.50%
CET1 capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 311,659	$ 287,706
CET1 capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier 1 capital, Actual Amount	$ 1,202,125	$ 1,201,863
Tier 1 capital, Actual Ratio	25.10%	27.20%
Tier 1 capital, For Capital Adequacy Purposes, Amount	$ 287,685	$ 265,575
Tier 1 capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 383,580	$ 354,100
Tier 1 capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Total capital, Actual Amount	$ 1,210,589	$ 1,210,261
Total capital, Actual Ratio	25.20%	27.30%
Total capital, For Capital Adequacy Purposes, Amount	$ 383,580	$ 354,100
Total capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 479,475	$ 442,625
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%

Fair Value Of Financial Instr_3

Fair Value Of Financial Instruments (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from principal repayments	$ 192,966	$ 144,643	$ 326,814
ACL maintained for loans individually evaluated for impairment	0	0
Capital City Bancshares, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	889
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	2,670,000	2,400,000
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	2,900,000	2,920,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds received from sale of AFS securities	2,100
Proceeds from principal repayments		88	97
(Decreases) increases in net unrealized losses included in OCI		(218)	$ 61
Loans individually evaluated for impairment	6,700	18,400
OREO	1,900	1,400
Significant Unobservable Inputs (Level 3) [Member] | Other Income [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on sale of AFS securities	$ 9
Significant Unobservable Inputs (Level 3) [Member] | Estimated Selling Costs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.10
OREO, measurement input	0.10
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans individually evaluated for impairment	$ 6,700	18,400
OREO	$ 1,900	$ 1,400

Fair Value Of Financial Instr_4

Fair Value Of Financial Instruments (Schedule Of Fair Value Assets Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	$ 714,614	$ 415,831
GSE Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	265,398	270,729
MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	445,090	141,516
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	4,126	1,535
Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities		2,051
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	714,614	415,831
Interest rate swaps	9,685
Assets	724,299
Interest rate swaps		598
Fair Value, Measurements, Recurring [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
Interest rate swaps	0
Assets	0
Interest rate swaps		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	714,614	413,780
Interest rate swaps	9,685
Assets	724,299
Interest rate swaps		598
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	0	2,051
Interest rate swaps	0
Assets	0
Interest rate swaps		0
Fair Value, Measurements, Recurring [Member] | GSE Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	265,398	270,729
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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	265,398	270,729
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	445,090	141,516
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | MBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	445,090	141,516
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities	4,126	1,535
Fair Value, Measurements, Recurring [Member] | 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	0
Fair Value, Measurements, Recurring [Member] | 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	4,126	1,535
Fair Value, Measurements, Recurring [Member] | 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	0
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS securities		2,051
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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

Fair Value Of Financial Instr_5

Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Assets:
AFS securities	$ 714,614	$ 415,831
HTM securities	601,071	833,009
Carrying Amount [Member]
Assets:
Cash and cash equivalents	139,055	351,659
AFS securities	714,614	415,831
HTM securities	612,318	827,738
Loans receivable	7,514,485	7,195,071
FHLB stock	99,726	100,954
Interest rate swaps	9,685	0
Liabilities:
Deposits	5,603,354	5,309,868
FHLB borrowings	2,174,981	2,173,808
Other borrowings	110,052	200,000
Interest rate swaps	0	598
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	139,055	351,659
AFS securities	714,614	415,831
HTM securities	601,071	833,009
Loans receivable	7,418,026	7,354,100
FHLB stock	99,726	100,954
Interest rate swaps	9,685	0
Liabilities:
Deposits	5,569,591	5,318,249
FHLB borrowings	2,145,477	2,182,841
Other borrowings	109,465	202,004
Interest rate swaps	$ 0	$ 598

Other Comprehensive Income (Det

Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,918
Other comprehensive income (loss)	755	$ (2,997)	$ (2,459)
Reclassification of certain income tax effects related to adoption of ASU 2018-02	0
Ending Balance	4,340	2,918
Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,290	5,915
Other comprehensive income (loss), before reclassifications	(6,741)	(2,625)
Amount reclassified from AOCI	0	0
Other comprehensive income (loss)	(6,741)	(2,625)
Reclassification of certain income tax effects related to adoption of ASU 2018-02	461
Ending Balance	(2,990)	3,290	5,915
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(372)	0
Other comprehensive income (loss), before reclassifications	6,981	(506)
Amount reclassified from AOCI	515	134
Other comprehensive income (loss)	7,496	(372)
Reclassification of certain income tax effects related to adoption of ASU 2018-02	206
Ending Balance	7,330	(372)	0
AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,918	5,915
Other comprehensive income (loss), before reclassifications	240	(3,131)
Amount reclassified from AOCI	515	134	0
Other comprehensive income (loss)	755	(2,997)	(2,459)
Reclassification of certain income tax effects related to adoption of ASU 2018-02	667
Ending Balance	$ 4,340	$ 2,918	$ 5,915

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) (Summary Of Quarterly Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Selected Quarterly Financial Information [Abstract]
Total interest and dividend income	$ 77,313	$ 82,161	$ 81,774	$ 80,644	$ 80,574	$ 79,630	$ 77,660	$ 75,322	$ 321,892	$ 313,186	$ 301,113
Net interest and dividend income	50,077	49,433	49,889	49,374	49,658	49,364	49,054	47,306	198,773	195,382	192,182
Provision for credit losses	0	0	0	0	0	0	0	0	0	0	(750)
Net income	$ 21,389	$ 22,372	$ 23,330	$ 31,836	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 98,927	$ 84,137	$ 83,494
Basic EPS	$ 0.16	$ 0.17	$ 0.17	$ 0.24	$ 0.15	$ 0.16	$ 0.16	$ 0.15	$ 0.73	$ 0.63	$ 0.63
Diluted EPS	0.16	0.17	0.17	0.24	0.15	0.16	0.16	0.15	0.73	0.63	0.63
Dividends declared per share	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.085	$ 0.335	$ 0.085	$ 0.375	$ 0.88	$ 0.88	$ 0.84
Average number of basic shares outstanding	135,500,000	134,484,000	134,428,000	134,373,000	134,314,000	134,254,000	134,066,000	133,697,000	134,698,344	134,082,420	133,045,215
Average number of diluted shares outstanding	135,556,000	134,530,000	134,475,000	134,467,000	134,404,000	134,360,000	134,259,000	133,950,000	134,758,991	134,243,862	133,176,376

Parent Company Financial Info_3

Parent Company Financial Information (Parent Company Only) (Schedule Of Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
ASSETS:
Cash and cash equivalents	$ 139,055	$ 351,659	$ 281,764	$ 772,632
Other assets	271,167	216,845
Income taxes receivable, net	2,177	0
TOTAL ASSETS	9,449,547	9,192,916
LIABILITIES:
Income taxes payable, net	0	530
Accounts payable and accrued expenses	83,021	52,190
Deferred income tax liabilities, net	21,253	24,458
Total liabilities	8,057,925	7,824,603
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; 141,225,516 and 138,223,835 shares issued and outstanding as of September 30, 2018 and 2017, respectively	1,412	1,382
Additional paid-in capital	1,207,644	1,167,368
Unearned compensation - ESOP	(36,343)	(37,995)
Retained earnings	214,569	234,640
Total stockholders' equity	1,391,622	1,368,313	1,392,964	1,416,226
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 9,449,547	$ 9,192,916
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	141,225,516	138,223,835
Common stock, shares outstanding	141,225,516	138,223,835
Capitol Federal Financial Inc [Member]
ASSETS:
Cash and cash equivalents	$ 137,684	$ 120,785	$ 108,197	$ 96,171
Investment in the Bank	1,221,706	1,204,781
Note receivable - ESOP	41,285	42,557
Other assets	690	365
Income taxes receivable, net	486	0
TOTAL ASSETS	1,401,851	1,368,488
LIABILITIES:
Income taxes payable, net	0	88
Junior subordinated debentures	10,052	0
Accounts payable and accrued expenses	177	52
Deferred income tax liabilities, net	0	35
Total liabilities	10,229	175
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; 141,225,516 and 138,223,835 shares issued and outstanding as of September 30, 2018 and 2017, respectively	1,412	1,382
Additional paid-in capital	1,207,644	1,167,368
Unearned compensation - ESOP	(36,343)	(37,995)
Retained earnings	214,569	234,640
AOCI, net of tax	4,340	2,918
Total stockholders' equity	1,391,622	1,368,313
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,401,851	$ 1,368,488
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	141,225,516	138,223,835
Common stock, shares outstanding	141,225,516	138,223,835

Parent Company Financial Info_4

Parent Company Financial Information (Parent Company Only) (Schedule Of Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
INTEREST AND DIVIDEND INCOME:
Total interest and dividend income	$ 77,313	$ 82,161	$ 81,774	$ 80,644	$ 80,574	$ 79,630	$ 77,660	$ 75,322	$ 321,892	$ 313,186	$ 301,113
INTEREST EXPENSE									123,119	117,804	108,931
NET INTEREST INCOME	50,077	49,433	49,889	49,374	49,658	49,364	49,054	47,306	198,773	195,382	192,182
NON-INTEREST INCOME									4,524	4,910	5,057
NON-INTEREST EXPENSE:
Salaries and employee benefits									46,563	43,437	42,378
Regulatory and outside services									5,709	5,821	5,645
Other non-interest expense									3,356	2,827	3,384
Total non-interest expense									96,902	89,658	94,305
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									123,906	127,920	121,939
INCOME TAX (BENEFIT) EXPENSE									24,979	43,783	38,445
NET INCOME	$ 21,389	$ 22,372	$ 23,330	$ 31,836	$ 20,602	$ 21,370	$ 21,587	$ 20,578	98,927	84,137	83,494
Capitol Federal Financial Inc [Member]
INTEREST AND DIVIDEND INCOME:
Dividend income from the Bank									134,540	120,215	117,513
Interest income from other investments									1,951	1,715	1,725
Total interest and dividend income									136,491	121,930	119,238
INTEREST EXPENSE									62	0	0
NET INTEREST INCOME									136,429	121,930	119,238
NON-INTEREST EXPENSE:
Salaries and employee benefits									1,031	896	827
Regulatory and outside services									1,129	247	261
Other non-interest expense									581	561	558
Total non-interest expense									2,741	1,704	1,646
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									133,688	120,226	117,592
INCOME TAX (BENEFIT) EXPENSE									(179)	4	28
INCOME BEFORE EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									133,867	120,222	117,564
EQUITY IN EXCESS OF DISTRIBUTION OVER EARNINGS OF SUBSIDIARY									(34,940)	(36,085)	(34,070)
NET INCOME									$ 98,927	$ 84,137	$ 83,494

Parent Company Financial Info_5

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, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 21,389	$ 22,372	$ 23,330	$ 31,836	$ 20,602	$ 21,370	$ 21,587	$ 20,578	$ 98,927	$ 84,137	$ 83,494
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of equipment									8,458	7,796	7,141
Provision for deferred income taxes									(4,540)	922	470
Changes in:
Other assets									1,712	51	1,807
Accounts payable and accrued expenses									(639)	(10,743)	(6,840)
Net cash provided by operating activities									124,163	85,445	84,956
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash acquired from acquisition									15,685	0	0
Net cash (used in) provided by investing activities									(21,567)	146,284	99,494
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid									(118,312)	(117,963)	(111,767)
Stock options exercised									261	8,843	4,070
Net cash used in financing activities									(315,200)	(161,834)	(675,318)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS									(212,604)	69,895	(490,868)
CASH AND CASH EQUIVALENTS:
Beginning of year				351,659				281,764	351,659	281,764	772,632
End of year	139,055				351,659				139,055	351,659	281,764
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Common stock issued for acquisition									39,113	0	0
Capitol Federal Financial Inc [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									98,927	84,137	83,494
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in excess of distribution over earnings of subsidiary									34,940	36,085	34,070
Depreciation of equipment									30	29	30
Provision for deferred income taxes									(35)	(2)	2
Changes in:
Other assets									(53)	(5)	1
Income taxes receivable/payable									(145)	(40)	445
Accounts payable and accrued expenses									(257)	(22)	14
Net cash provided by operating activities									133,407	120,182	118,056
CASH FLOWS FROM INVESTING ACTIVITIES:
Principal collected on notes receivable from ESOP									1,272	1,233	1,194
Cash acquired from acquisition									18	0	0
Net cash (used in) provided by investing activities									1,290	1,233	1,194
CASH FLOWS FROM FINANCING ACTIVITIES:
Net payment from subsidiary related to restricted stock awards									253	293	473
Cash dividends paid									(118,312)	(117,963)	(111,767)
Stock options exercised									261	8,843	4,070
Net cash used in financing activities									(117,798)	(108,827)	(107,224)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS									16,899	12,588	12,026
CASH AND CASH EQUIVALENTS:
Beginning of year				$ 120,785				$ 108,197	120,785	108,197	96,171
End of year	$ 137,684				$ 120,785				137,684	120,785	108,197
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Common stock issued for acquisition									39,113	0	0
Capital contribution to subsidiary in conjunction with acquisition of CCB									$ 48,798	$ 0	$ 0