Great Western Bancorp (GWB) 10-Q 11 Aug 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2016	Aug. 04, 2016
Document Information [Abstract]
Entity Registrant Name	Great Western Bancorp, Inc.
Entity Central Index Key	1,613,665
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		58,693,304

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Assets
Cash and due from banks	$ 475,785	$ 237,770
Securities available for sale	1,361,164	1,327,327
Loans, net of unearned discounts and deferred fees, including $80,137 and $97,030 of loans covered by FDIC loss share agreements at June 30, 2016 and September 30, 2015, respectively, and $1,156,442 and $1,118,687 of loans and written loan commitments at fair value under the fair value option at June 30, 2016 and September 30, 2015, respectively, and $21,301 and $9,867 of loans held for sale at June 30, 2016 and September 30, 2015, respectively.	8,606,974	7,325,198
Allowance for loan and lease losses	(64,243)	(57,200)
Net loans	8,542,731	7,267,998
Premises and equipment, including $7,974 and $0 of property held for sale at June 30, 2016 and September 30, 2015	118,151	97,550
Accrued interest receivable	43,547	44,077
Other repossessed property, including $50 and $61 of property covered by FDIC loss share arrangements at June 30, 2016 and September 30, 2015, respectively	11,701	15,892
FDIC indemnification asset	11,706	14,722
Goodwill	738,460	697,807
Core deposits and other intangibles	12,757	7,119
Loan servicing rights	6,231	0
Cash value of life insurance	28,945	6,800
Net deferred tax assets	40,199	32,470
Other assets	61,845	49,122
Total assets	11,453,222	9,798,654
Deposits
Noninterest-bearing	1,802,169	1,368,453
Interest-bearing	6,678,040	6,018,612
Total deposits	8,480,209	7,387,065
Securities sold under agreements to repurchase	159,016	185,271
FHLB advances and other borrowings	913,377	581,000
Subordinated debentures and subordinated notes payable	111,827	90,727
Fair value of derivatives	91,319	53,613
Accrued interest payable	5,387	4,006
Accrued expenses and other liabilities	51,576	37,626
Total liabilities	9,812,711	8,339,308
Stockholders’ equity
Common stock, $0.01 par value, authorized 500,000,000 shares; 58,693,499 shares issued and outstanding at June 30, 2016 and 55,219,596 shares issued and outstanding at September 30, 2015	587	552
Additional paid-in capital	1,311,510	1,201,387
Retained earnings	319,383	255,089
Accumulated other comprehensive income	9,031	2,318
Total stockholders' equity	1,640,511	1,459,346
Total liabilities and stockholders' equity	$ 11,453,222	$ 9,798,654

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Statement of Financial Position [Abstract]
Loans covered by FDIC loss share agreements	$ 80,137	$ 97,030
Loans and written loan commitments at fair value under the fair value option	1,156,442	1,118,687
Loans held for sale	21,301	9,867
Property held for sale	7,974	0
Property covered under FDIC loss share agreements	$ 50	$ 61
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	58,693,499	55,219,596
Common stock, shares outstanding	58,693,499	55,219,596

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest and dividend income
Loans	$ 93,749	$ 85,240	$ 269,137	$ 251,978
Taxable securities	5,826	5,984	17,600	17,050
Nontaxable securities	61	10	85	36
Dividends on securities	396	489	832	997
Federal funds sold and other	157	155	326	599
Total interest and dividend income	100,189	91,878	287,980	270,660
Interest expense
Deposits	6,451	5,776	18,145	17,775
Securities sold under agreements to repurchase	124	134	395	430
FHLB advances and other borrowings	986	867	2,831	2,706
Related party notes payable	0	233	0	692
Subordinated debentures and subordinated notes payable	976	330	2,662	985
Total interest expense	8,537	7,340	24,033	22,588
Net interest income	91,652	84,538	263,947	248,072
Provision for loan and lease losses	5,372	4,410	11,892	17,408
Net interest income after provision for loan and lease losses	86,280	80,128	252,055	230,664
Noninterest income
Service charges and other fees	12,316	9,627	33,098	28,896
Wealth management fees	1,807	1,972	5,087	5,754
Mortgage banking income, net	1,669	1,903	4,143	5,027
Net gain (loss) on sale of securities	134	0	(196)	51
Net increase (decrease) in fair value of loans at fair value	14,198	(24,394)	35,253	7,914
Net realized and unrealized gain (loss) on derivatives	(21,925)	18,946	(53,379)	(27,357)
Other	898	1,951	2,733	4,556
Total noninterest income	9,097	10,005	26,739	24,841
Noninterest expense
Salaries and employee benefits	28,352	26,612	78,417	75,373
Data processing	5,625	4,657	15,822	14,193
Occupancy expenses	4,002	3,161	11,436	11,169
Professional fees	3,327	3,289	9,087	10,464
Communication expenses	788	1,031	2,650	3,429
Advertising	1,047	1,196	3,015	2,870
Equipment expense	959	1,075	2,794	2,956
Net loss recognized on repossessed property and other related expenses	379	1,067	479	5,547
Amortization of core deposits and other intangibles	822	1,776	2,239	6,402
Acquisition expenses	12,179	0	12,950	0
Other	3,742	2,566	11,408	9,556
Total noninterest expense	61,222	46,430	150,297	141,959
Income before income taxes	34,155	43,703	128,497	113,546
Provision for income taxes	7,795	14,871	41,002	38,293
Net income	26,360	28,832	87,495	75,253
Other comprehensive income (loss) - change in net unrealized gain (loss) on securities available for sale (net of deferred income tax (expense) benefit of $(2,649), and $2,254 for the three months ended June 30, 2016 and 2015, respectively and $(4,115) and $(2,712) for the nine months ended June 30, 2016 and 2015, respectively)	4,322	(3,845)	6,713	4,423
Comprehensive income	$ 30,682	$ 24,987	$ 94,208	$ 79,676
Basic earnings per common share
Weighted average shares outstanding	57,012,698	57,898,335	55,845,322	57,897,484
Earnings per share (in dollars per share)	$ 0.46	$ 0.50	$ 1.57	$ 1.30
Diluted earnings per common share
Weighted average shares outstanding (in shares)	57,176,705	57,959,202	55,993,011	57,929,188
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.50	$ 1.56	$ 1.30
Dividends per share
Dividends paid	$ 7,734	$ 6,946	$ 23,201	$ 13,893
Dividends per share (in dollars per share)	$ 0.14	$ 0.12	$ 0.42	$ 0.24

Consolidated Statements of Com5

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Income tax (expense) benefit	$ (2,649)	$ 2,254	$ (4,115)	$ (2,712)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Comprehensive Income	Common Stock Par Value	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Sep. 30, 2014	$ 1,421,090		$ 579	$ 1,260,124	$ 166,544	$ (6,157)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	75,253	$ 75,253			75,253
Other comprehensive income, net of tax:
Net change in net unrealized gain (loss) on securities available for sale	4,423	4,423				4,423
Comprehensive income	79,676	79,676
Stock-based compensation	978			978
Common stock dividends, $0.42 and $0.24 in FY 2016 and FY 2015, respectively	(13,893)				(13,893)
Ending balance at Jun. 30, 2015	1,487,851		579	1,261,102	227,904	(1,734)
Beginning balance at Sep. 30, 2015	1,459,346		552	1,201,387	255,089	2,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87,495	87,495			87,495
Other comprehensive income, net of tax:
Net change in net unrealized gain (loss) on securities available for sale	6,713	6,713				6,713
Comprehensive income	94,208	$ 94,208
Stock-based compensation	2,680			2,680
Common stock issued in business acquisition	107,478		35	107,443
Common stock dividends, $0.42 and $0.24 in FY 2016 and FY 2015, respectively	(23,201)				(23,201)
Ending balance at Jun. 30, 2016	$ 1,640,511		$ 587	$ 1,311,510	$ 319,383	$ 9,031

Consolidated Statement of Stoc7

Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (in USD per share)	$ 0.42	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 87,495	$ 75,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,827	17,474
Amortization of FDIC indemnification asset	2,886	6,347
Net loss (gain) on sale of securities	196	(51)
Net gain on sale of loans	(4,485)	(5,027)
Net loss on FDIC indemnification asset	836	1,686
Net (gain) on sale of premises and equipment	(32)	(1,681)
Loss from sale/writedowns of repossessed property	479	5,547
Provision for loan and lease losses	11,892	17,408
Provision for loan servicing rights loss	176	0
Stock-based compensation	2,680	978
Originations of residential real estate loans held for sale	(184,255)	(212,144)
Proceeds from sales of residential real estate loans held for sale	172,821	218,379
Deferred income taxes	(7,458)	3,107
Changes in:
Accrued interest receivable	4,647	3,081
Other assets	4,576	(3,143)
FDIC clawback liability	801	708
Accrued interest payable and other liabilities	31,619	4,456
Net cash provided by operating activities	136,701	132,378
Investing activities
Purchase of securities available for sale	(195,042)	(327,955)
Proceeds from sales of securities available for sale	145,934	55,149
Proceeds from maturities of securities available for sale	186,483	205,609
Net increase in loans	(408,571)	(474,849)
(Payment) reimbursement of covered losses from FDIC indemnification claims	(706)	1,666
Purchase of premises and equipment	(6,660)	(2,108)
Proceeds from sale of premises and equipment	641	2,765
Proceeds from sale of repossessed property	4,693	31,329
Purchase of FHLB stock	(34,495)	(40,027)
Proceeds from redemption of FHLB stock	27,471	39,662
Net cash paid in business acquisition	(15,669)	0
Net cash used in investing activities	(295,921)	(508,759)
Financing activities
Net increase in deposits	230,191	305,508
Net (decrease) in securities sold under agreements to repurchase	(131,910)	(128)
Net increase in FHLB advances and other borrowings	322,155	15,426
Dividends paid	(23,201)	(13,893)
Net cash provided by financing activities	397,235	306,913
Net increase (decrease) in cash and due from banks	238,015	(69,468)
Cash and due from banks, beginning of period	237,770	256,639
Cash and due from banks, end of period	475,785	187,171
Supplemental disclosure of cash flow information
Cash payments for interest	22,652	23,650
Cash payments for income taxes	44,476	42,088
Supplemental disclosure of noncash investing and financing activities
Loans transferred to repossessed properties	(1,817)	(7,447)
Repossessed property transferred to premises and equipment	$ (840)	$ 0

Nature of Operations and Summar

Nature of Operations and Summary of Significant Policies	9 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Nature of Operations and Summary of Significant Policies	Nature of Operations and Summary of Significant Policies Nature of Operations Great Western Bancorp, Inc. (the “Company”) is a bank holding company organized under the laws of Delaware. The primary business of the Company is ownership of its wholly owned subsidiary, Great Western Bank (the “Bank”). The Bank is a full-service regional bank focused on relationship-based business and agribusiness banking in Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota and South Dakota. The Company and the Bank are subject to the regulation of certain federal and/or state agencies and undergo periodic examinations by those regulatory authorities. Substantially all of the Company’s income is generated from banking operations. Basis of Presentation The accompanying unaudited consolidated interim financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and reflect all adjustments that are, in the opinion of management, necessary for the fair presentation of the financial position and results of operations for the periods presented. All such adjustments are of a normal recurring nature. Certain previously reported amounts have been reclassified to conform to the current presentation. The unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended September 30, 2015 , which includes a description of significant accounting policies. The results of operations for interim periods are not necessarily indicative of the results that may be expected for the year or any other period. The accompanying unaudited consolidated financial statements include the accounts and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. The preparation of unaudited consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates. Business Combinations The Company accounts for business combinations under the acquisition method of accounting in accordance with ASC 805, “Business Combinations” (“ASC 805”). The Company recognizes the fair value of the assets acquired and liabilities assumed, immediately expenses transaction costs and accounts for restructuring plans separately from the business combination. There is no separate recognition of the acquired allowance for loan and lease losses on the acquirer’s balance sheet as credit related factors are incorporated directly into the fair value of the loans recorded at the acquisition date. The excess of the cost of the acquisition over the fair value of the net tangible and intangible assets acquired is recorded as goodwill. Alternatively, a bargain purchase gain is recorded equal to the amount by which the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. Results of operations of the acquired business are included in the consolidated statements of comprehensive income from the effective date of acquisition. Securities The Company classifies securities upon purchase in one of three categories: trading, held to maturity, or available for sale. Debt and equity securities held for resale are classified as trading. Debt securities for which the Company has the ability and positive intent to hold until maturity are classified as held to maturity. All other securities are classified as available for sale as they may be sold prior to maturity in response to changes in the Company’s interest rate risk profile, funding needs, demand for collateralized deposits by public entities or other reasons. Held to maturity securities are stated at amortized cost, which represents actual cost adjusted for premium amortization and discount accretion. Available for sale securities are stated at fair value, with unrealized gains and losses, net of related taxes, included in stockholders’ equity as a component of accumulated other comprehensive income (loss). Trading securities are stated at fair value. Realized and unrealized gains and losses from sales and fair value adjustments of trading securities are included in other noninterest income in the consolidated statements of comprehensive income. Purchases and sales of securities are recognized on a trade date basis. The cost of securities sold is based on the specific identification method. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are recognized in earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, management considers the length of time and extent to which the fair value has been less than amortized cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment loss is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in accumulated other comprehensive income (loss). Interest and dividends, including amortization of premiums and accretion of discounts, are recognized as interest or dividend income when earned. Realized gains and losses on sales (using the specific identification method) and declines in value judged to be other- than-temporary are included in noninterest income in the consolidated statements of comprehensive income. Loans The Company’s accounting method for loans differs depending on whether the loans were originated or purchased and, for purchased loans, whether the loans were acquired at a discount related to evidence of credit deterioration since date of origination. Originated Loans Loans that management has the intent and ability to hold for the foreseeable future, or until maturity or pay-off, generally are reported at their outstanding principal balance, adjusted for charge-offs, the allowance for loan and lease losses, and any unamortized deferred fees or costs. Other fees, not associated with originating a loan are recognized as fee income when earned. Interest income on loans is accrued daily on the outstanding balances. Accrual of interest is discontinued when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that collection of interest is doubtful, which is generally at 90 days past due. Generally, when loans are placed on nonaccrual status, interest receivable is reversed against interest income in the current period. Interest payments received thereafter are applied as a reduction to the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans are removed from nonaccrual status when they become current as to both principal and interest and concern no longer exists as to the collectability of principal and interest. The Company has elected to measure certain long-term loans and written loan commitments at fair value to assist in managing interest rate risk for longer-term loans. Fair value loans are fixed-rate loans having original maturities of 5 years or greater (typically between 5 and 15 years ) to our business and agribusiness banking customers to assist them in facilitating their risk management strategies. The fair value option was elected upon the origination or acquisition of these loans and written loan commitments. Interest income is recognized in the same manner on loans reported at fair value as on non-fair value loans, except in regard to origination fees and costs which are recognized immediately upon closing. The changes in fair value of long-term loans and written loan commitments at fair value are reported in noninterest income. For loans held for sale, loan fees charged or received on origination, net of certain direct loan origination costs, are recognized in income when the related loan is sold. For loans held for investment, loan fees, net of certain direct loan origination costs, are deferred, and the net amount is amortized as an adjustment of the related loan’s yield. The Company is generally amortizing these amounts over the contractual lives of the loans. Commitment fees are recognized as income when received. The Company grants commercial, agricultural, consumer, residential real estate, and other loans to customers primarily in Arizona, Colorado, Iowa, Kansas, Missouri, Minnesota, Nebraska, North Dakota and South Dakota. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower. Collateral held varies but includes accounts receivable, inventory, property and equipment, residential real estate, and income-producing commercial and agricultural properties. Government guarantees are also obtained for some loans, which reduces the Company’s risk of loss. Loans originated and intended for sale in the secondary market are carried at the lower of cost or fair value. Loans held for sale include fixed rate single-family residential mortgage loans under contract to be sold in the secondary market. In most cases, loans are carried at cost and sold within 45 days . These loans are sold with the mortgage servicing rights released. Under limited circumstances, buyers may have recourse to return a purchased loan to the Company. Recourse conditions may include early payment default, breach of representation or warranties, or documentation deficiencies. Fair value of loans held for sale is determined based on prevailing market prices for loans with similar characteristics, sale contract prices, or, for certain portfolios, discounted cash flow analysis. Declines in fair value below cost (and subsequent recoveries) are recognized in net gain on sale of loans. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Gains or losses on sales are recognized upon delivery and included in net gain on sale of loans. Purchased Loans Loans acquired (non-impaired and impaired) in a business acquisition are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan and lease losses is not recorded at the acquisition date. In determining the acquisition date fair value of purchased loans with evidence of credit deterioration (“ASC 310-30 loans”), and in subsequent accounting, the Company generally aggregates impaired purchased consumer and certain smaller balance impaired commercial loans into pools of loans with common risk characteristics, while accounting for larger-balance impaired commercial loans individually. Expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level-yield method. Management estimates the cash flows expected to be collected at acquisition and at subsequent measurement dates using internal risk models, which incorporate the estimate of key assumptions, such as default rates, loss severity, and prepayment speeds. Subsequent to the acquisition date, decreases in cash flows over those expected at the acquisition date are recognized by recording an allowance for loan and lease losses. Subsequent increases in cash flow over those expected at the acquisition date are recognized as reductions to allowance for loan and lease losses to the extent impairment was previously recognized and thereafter as interest income prospectively. For purchased loans not deemed impaired at the acquisition date, the difference between the fair value and the unpaid principal balance of the loan at acquisition date is amortized or accreted to interest income using the effective interest method over the remaining period to contractual maturity. Credit Risk Management The Company’s strategy for credit risk management includes well-defined, centralized credit policies, uniform underwriting criteria and ongoing risk monitoring and review processes for all credit exposures. The strategy also emphasizes diversification on a geographic, industry, and customer level; regular credit examinations; and management reviews of loans exhibiting deterioration of credit quality. The credit risk management strategy also includes a credit risk assessment process that performs assessments of compliance with commercial and consumer credit policies, risk ratings, and other critical credit information. Loan decisions are documented with respect to the borrower’s business, purpose of the loan, evaluation of the repayment sources, and the associated risks, evaluation of collateral, covenants and monitoring requirements, and risk rating rationale. The Company categorizes its loan portfolio into six classes, which is the level at which it develops and documents a systematic methodology to determine the allowance for loan and lease losses. The Company’s six loan portfolio classes are residential real estate, commercial real estate, commercial non real estate, agriculture, consumer and other lending. The residential real estate lending class includes loans made to consumer customers including residential mortgages, residential construction loans and home equity loans and lines. These loans are typically fixed rate loans secured by residential real estate. Home equity lines are revolving accounts giving the borrower the ability to draw and repay balances repeatedly, up to a maximum commitment, and are secured by residential real estate. Home equity lines typically have variable rate terms which are benchmarked to a prime rate. Historical loss history is the primary factor in determining the allowance for loan and lease losses for the residential real estate lending class. Key risk characteristics relevant to residential real estate lending class loans primarily relate to the borrower’s capacity and willingness to repay and include unemployment rates and other economic factors, and customer payment history. These risk characteristics, among others, are reflected in the environmental factors considered in determining the allowance for loan and lease losses. The commercial real estate lending class includes loans made to small and middle market businesses, including multifamily properties. Loans in this class are secured by commercial real estate. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the commercial real estate lending class. Key risk characteristics relevant to the commercial real estate lending class include the industry and geography of the borrower’s business, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The commercial non real estate lending class includes loans made to small and middle market businesses, and loans made to public sector customers. Loans in this class are generally secured by business assets and guaranteed by owners; cashflows are most often our primary source of repayment. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the commercial non real estate lending class. Key risk characteristics relevant to the commercial non real estate lending class include the industry and geography of the borrower’s business, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The agriculture lending class includes loans made to small and mid-size agricultural businesses and individuals. Loans in this class are generally secured by operating assets and guaranteed by owners; cashflows are most often our primary source of repayment. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the agriculture lending class. Key risk characteristics relevant to the agriculture lending class include the geography of the borrower’s operations, commodity prices and weather patterns, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The consumer lending class includes loans made to consumer customers including loans secured by automobiles and other installment loans, and the other lending class includes credit card loans and unsecured revolving credit lines. Historical loss history is the primary factor in determining the allowance for loan and lease losses for the consumer and other lending classes. Key risk characteristics relevant to loans in the consumer and other lending classes primarily relate to the borrower’s capacity and willingness to repay and include unemployment rates and other economic factors, and customer payment and overall credit history. These risk characteristics, among others, are reflected in the environmental factors considered in determining the allowance for loan and lease losses. The Company assigns all non-consumer loans a credit quality risk rating. These ratings are Pass, Watch, Substandard, Doubtful, and Loss. Loans with a Pass and Watch rating represent those loans not classified on the Company’s rating scale for problem credits, with loans with a Watch rating being monitored and updated at least quarterly by management. Substandard loans are those where a well-defined weakness has been identified that may put full collection of contractual debt at risk. Doubtful loans are those where a well-defined weakness has been identified and a loss of contractual debt is probable. Substandard and doubtful loans are monitored and updated monthly. All loan risk ratings are updated and monitored on a continuous basis. The Company generally does not risk rate consumer loans unless a default event such as bankruptcy or extended nonperformance takes place. Alternatively, standard credit scoring systems are used to assess credit risks of consumer loans. Troubled Debt Restructurings (“TDRs”) Loans modified under troubled debt restructurings involve granting a concession to a borrower who is experiencing financial difficulty. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance, or other actions intended to maximize collection, which generally would not otherwise be considered. Our TDRs include performing and nonperforming TDRs, which consist of loans that continue to accrue interest at the loan's original interest rate as we expect to collect the remaining principal and interest on the loan, and nonaccrual TDRs, which include loans that are in a nonaccrual status and are no longer accruing interest, as we do not expect to collect the full amount of principal and interest owned from the borrower on these loans. At the time of modification (except for loans on nonaccrual status), a TDR is classified as nonperforming TDR until a six -month payment history of principal and interest payments, in accordance with the terms of the loan modification, is sustained, at which time we move the loan to a performing status (performing TDR). If we do not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. All TDRs are accounted for as impaired loans and are included in our analysis of the allowance for loan and lease losses. A TDR that has been re-underwritten and renewed for a borrower who is no longer experiencing financial difficulty and which yields a market rate of interest at the time of a renewal is no longer considered a TDR. Allowance for Loan and Lease Losses (“ALLL”) and Unfunded Commitments The Company maintains an allowance for loan and lease losses at a level management believes is appropriate to reserve for credit losses inherent in our loan portfolio. The allowance for loan and lease losses is determined based on an ongoing evaluation, driven primarily by monitoring changes in loan risk grades, delinquencies, and other credit risk indicators, which is inherently subjective. The Company considers the uncertainty related to certain industry sectors and the extent of credit exposure to specific borrowers within the portfolio. In addition, consideration is given to concentration risks associated with the various loan portfolios and current economic conditions that might impact the portfolio. The Company also considers changes, if any, in underwriting activities, the loan portfolio composition (including product mix and geographic, industry, or customer-specific concentrations), trends in loan performance, the level of allowance coverage relative to similar banking institutions and macroeconomic factors, such as changes in unemployment rates, gross domestic product, and consumer bankruptcy filings. All of these estimates are susceptible to significant change. Changes to the allowance for loan and lease losses are made by charges to the provision for loan and lease losses, which is reflected in the consolidated statements of comprehensive income. Past due status is monitored as an indicator of credit deterioration. Loans that are 90 days or more past due are put on nonaccrual status unless the loan is well secured and in the process of collection. Loans deemed to be uncollectible are charged off against the allowance for loan and lease losses. Recoveries of amounts previously charged-off are credited to the allowance for loan and lease losses. The allowance for loan and lease losses consist of reserves for probable losses that have been identified related to specific borrowing relationships that are individually evaluated for impairment (“specific reserve”), as well as probable losses inherent in our loan portfolio that are not specifically identified (“collective reserve”). The specific reserve relates to impaired loans. A loan is impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due (interest as well as principal) according to the contractual terms of the loan agreement. Specific reserves are determined on a loan-by-loan basis based on management’s best estimate of the Company’s exposure, given the current payment status of the loan, the present value of expected payments, and the value of any underlying collateral. Impaired loans also include loans modified in troubled debt restructurings. Generally, the impairment related to troubled debt restructurings is measured based on the fair value of the collateral, less cost to sell, or the present value of expected payments relative to the unpaid principal balance. If the impaired loan is identified as collateral dependent, then the fair value of the collateral method of measuring the amount of the impairment is utilized. This method requires obtaining an independent appraisal of the collateral and applying a discount factor to the appraised value, if necessary, and including costs to sell. Management’s estimate for collective reserves reflects losses incurred in the loan portfolio as of the consolidated balance sheet reporting date. Incurred loss estimates primarily are based on historical loss experience and portfolio mix. Incurred loss estimates may be adjusted for qualitative factors such as current economic conditions and current portfolio trends including credit quality, concentrations, aging of the portfolio, and/or significant policy and underwriting changes. The Company maintains an ALLL for acquired impaired loans accounted for under ASC 310-30, resulting from decreases in expected cash flows arising from the periodic revaluation of these loans. Any decrease in expected cash flows in the individual loan pool is generally recognized in the current provision for loan and lease losses. Any increase in expected cash flows is generally not recognized immediately, but is instead reflected as an adjustment to the related loan or pool's yield on a prospective basis once any previously recorded provision for loan and lease loss has been recognized. For acquired nonimpaired loans accounted for under ASC 310-20, the Company utilizes methods to estimate the required allowance for loan and lease losses similar to originated loans; the required reserve is compared to the net carrying value of each acquired nonimpaired loan (by segment) to determine if a provision is required. While management uses the best information available to establish the allowance for loan and lease losses, future adjustments may be necessary if economic conditions differ substantially from the assumptions used in performing the estimates. Unfunded residential mortgage loan commitments entered into in connection with mortgage loans to be held for sale are considered derivatives and are recorded at fair value and included in other liabilities on the consolidated balance sheets with changes in fair value recorded in other interest income. All other unfunded loan commitments are generally related to providing credit facilities to customers and are not considered derivatives. For purchased loans, the fair value of the unfunded credit commitments is considered in determination of the fair value of the loans recorded at the date of acquisition. Reserves for credit exposure on all other unfunded credit commitments are recorded in other liabilities on the consolidated balance sheets. FDIC Indemnification Asset and Clawback Liability In conjunction with a Federal Deposit Insurance Corporation (“FDIC”)-assisted transaction of TierOne Bank in 2010, the Company entered into two loss share agreements with the FDIC, one covering certain single family residential mortgage loans with the claim period ending June 2020 and one covering commercial loans and other assets, in which the claim period ended in June 2015. The agreements cover a portion of realized losses on loans, foreclosed real estate and certain other assets. The Company has recorded assets on the consolidated balance sheets (i.e. indemnification assets) representing estimated future amounts recoverable from the FDIC. Fair values of loans covered by the loss sharing agreements at the acquisition date were estimated based on projected cash flows available based on the expected probability of default, default timing and loss given default, the expected reimbursement rates (generally 80% ) from the FDIC and other relevant terms of the loss sharing agreements. The initial fair value was established by discounting these expected cash flows with a market discount rate for instruments with like maturity and risk characteristics. The loss share assets are measured separately from the related loans and foreclosed real estate and recorded as an FDIC indemnification asset on the consolidated balance sheets because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses reduce the carrying amount of the loss share assets. Reductions to expected losses on covered assets, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, also reduce the carrying amount of the loss share assets. The rate of accretion of the indemnification asset discount included in interest income slows to mirror the accelerated accretion of the loan discount. Additional expected losses on covered assets, to the extent such expected losses result in the recognition of an allowance for loan and lease losses, increase the carrying amount of the loss share assets. A related increase in the value of the indemnification asset up to the amount covered by the FDIC is calculated based on the reimbursement rates from the FDIC and is included in other noninterest income. The corresponding loan accretion or amortization is recorded as a component of interest income on the consolidated statements of comprehensive income. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. As part of the loss sharing agreements, the Company also assumed a liability (“FDIC Clawback Liability”) to be paid within 45 days subsequent to the maturity or termination of the loss sharing agreements that is contingent upon actual losses incurred over the life of the agreements relative to expected losses considered in the consideration paid at acquisition date and the amount of losses reimbursed to the Company under the loss sharing agreements. The liability was recorded at fair value as of the acquisition date. The fair value was based on a discounted cash flow calculation that considered the formula defined in the loss sharing agreements and projected losses. The difference between the fair value at acquisition date and the projected losses is amortized through other noninterest expense. As projected losses and reimbursements are updated, as described above, the FDIC Clawback Liability is adjusted and a gain or loss is recorded in other noninterest expense. Loan Servicing Rights The Company records a servicing asset for contractually separated servicing from the underlying mortgage loans. Fair value is based on market prices for comparable mortgage servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The asset is amortized into mortgage banking income, net on the consolidated statement of comprehensive income in proportion to and over the period of estimated net servicing income. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to the carrying amount. Impairment is determined by stratifying rights into groupings based on characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to noninterest income. If the Company determines the impairment to be permanent, the valuation is written off against the loan servicing rights, which results in a new amortized balance. Changes in the valuation allowance are reported in mortgage banking income, net in the consolidated statement of comprehensive income. The fair value of loan servicing rights is subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Estimatin

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which addresses timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU requires institutions to measure all expected credit losses related to financial assets measured at amortized costs with an expected loss model based on historical experience, current conditions and reasonable and supportable forecasts relevant to affect the collectibility of the financial assets, which is referred to as the current expected credit loss (CECL) model. The ASU requires enhanced disclosures, including qualitative and quantitative requirements, to help understand significant estimates and judgments used in estimating credit losses, as well as provide additional information about the amounts recorded in the financial statements. ASU 2016-13 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted after December 15, 2018. The amendment requires the use of the modified retrospective approach for adoption. The Company is currently evaluating the potential impact of ASU 2016-13 on our financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Based Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , which addresses several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Earlier application is permitted. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The Company is currently evaluating the potential impact of ASU 2016-09 on our financial statements. In February 2016, the FASB issued ASU No. 2016-02 , Leases (Topic 842) , which requires that lessees recognize the assets and liabilities arising from leases on the balance sheet. ASU 2015-16 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the potential impact of ASU 2016-02 on our financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential impact of ASU 2016-01 on our financial statements. In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805) - Simplifying the Accounting for Measurement-Period Adjustments, which requires that adjustments to provisional amounts that are identified during the measurement period of a business combination be recognized in the reporting period in which the adjustment amounts are determined. Furthermore, the income statement effects of such adjustments, if any, must be calculated as if the accounting had been completed at the acquisition date. The portion of the amount recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. Under previous guidance, adjustments to provisional amounts identified during the measurement period are to be recognized retrospectively. ASU 2015-16 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Earlier application is permitted for financial statements that have not been issued, therefore the Company has elected to early adopt this ASU as of and for its quarter ended June 30, 2016 . The adoption of ASU 2015-16 in the third quarter of 2016 did not have a material impact on the Company's consolidated balance sheet or consolidated statement of comprehensive income. See also Note 3 to these consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) , which implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised 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 and services. In August 2015, the FASB issued ASU No. 2015-14 which deferred the effective date of ASU No. 2014-09 to annual reporting periods beginning after December 15, 2017. In March 2016, the FASB issued ASU No. 2016-08, which intends to improve the operability and understandability of the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued ASU No. 2016-10, which clarifies guidance pertaining to the identification of performance obligations and the licensing implementation. In May 2016, the FASB issued ASU Nos. 2016-11 and 2016-12, which further clarify guidance and provide practical expedients related to the adoption of ASU No. 2014-09. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the potential impact of these standards on our financial statements.

Acquisition Activity

Acquisition Activity	9 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Acquisition Activity	Acquisition Activity On May 16, 2016, the Company acquired by merger 100% of HF Financial Corp ("HF Financial"), the holding company of Home Federal Bank. Under terms of the agreement, HF Financial's stockholders had the right to receive for each share of HF Financial common stock, at their election (but subject to proration in the event cash or stock is oversubscribed), either (i) 0.6500 share of the Company's common stock, or (ii) $19.50 in cash. The total consideration was prorated as necessary to ensure that 24.29% of the total outstanding shares of HF Financial common stock were exchanged for cash and 75.71% of the total outstanding shares of HF Financial common stock were exchanged for shares of the Company's common stock. Total merger consideration of $142.0 million was paid by the Company in the acquisition, which resulted in goodwill of $40.7 million , as shown in the table below. With this acquisition, the Company expanded its presence into North Dakota and Minnesota through the addition of 23 bank offices and experienced in-market teams. The Company projects increased revenues from additional locations and customers and cost savings will be recognized in future periods through the elimination of redundant operations. The following summarizes consideration paid and an allocation of purchase price to net assets acquired. Number of Shares Amount (In thousands) Equity consideration: Common stock issued 3,448,119 $ 107,478 Non-equity consideration: Cash 34,487 Total consideration paid 141,965 Fair value of net assets acquired including identifiable intangible assets 101,312 Goodwill $ 40,653 Goodwill of $40.7 million arising from the acquisition arose as a result of consideration in excess of net assets acquired. The amount of goodwill that is expected to be deductible for income tax purposes is $0.0 million . The fair value of intangible assets created in the acquisition was $7.9 million related to core deposits and other intangible assets. The following table summarizes the assets acquired and liabilities assumed which were recorded on the consolidated balance sheet as of the date of merger of HF Financial: (In thousands) Fair Value Identifiable assets acquired: Cash and due from banks $ 18,818 Investment securities 165,052 Net loans 863,741 Premises and equipment 19,220 Accrued interest receivable 4,117 Other repossessed property 4 Intangible assets 7,877 Loan servicing rights 6,573 Other assets 36,639 Total identifiable assets acquired $ 1,122,041 Liabilities assumed: Deposits $ 863,121 FHLB advances and other borrowings 115,881 Subordinated debentures 21,110 Other liabilities 20,617 Total liabilities assumed 1,020,729 Fair value of net identifiable assets acquired 101,312 Net purchase price 141,965 Goodwill $ 40,653 The Company accounted for the aforementioned business combination under the acquisition method in accordance with ASC Topic 805, Business Combinations . Accordingly, the purchase price is allocated to the fair value of the assets acquired and liabilities assumed as of the date of acquisition. The foregoing purchase price allocations on the acquisition are preliminary and will be finalized upon the receipt of final valuations on certain assets and liabilities. Upon receipt of final fair value estimates, which must be within one year of the acquisition date, the Company will make any final adjustments to the purchase price allocation and retrospectively adjust any goodwill recorded. Material adjustments to acquisition date estimated fair values would be recorded in the reporting period in which the adjustment amounts are determined. Information regarding the Company’s loan discount and related deferred tax asset, core deposit intangible asset and related deferred tax liability, as well as income taxes payable and the related deferred tax balances recorded in the acquisition may be adjusted as the Company refines its estimates. Determining the fair value of assets and liabilities, particularly illiquid assets and liabilities, is a complicated process involving significant judgment regarding estimates and assumptions used to calculate estimated fair value. Fair value adjustments based on updated estimates could materially affect the goodwill recorded on the acquisition. The Company may incur losses on the acquired loans that are materially different from losses the Company originally projected. The results of the merged HF Financial operations are presented within the Company’s consolidated financial statements from the acquisition date. The disclosure of HF Financial's post-acquisition revenue and net income is not practical due to the combining of HF Financial’s operations with and into the Company as of the acquisition date. Acquisition-related transaction expenses associated with the HF Financial acquisition totaled $12.2 million and $12.9 million during the three and nine months ended June 30, 2016 , respectively, and $0.0 million for the three and nine months ended June 30, 2015 . Supplemental unaudited pro forma information The following unaudited pro forma combined results of operations of the Company and HF Financial presents results as if the acquisition had been completed as of the beginning of each period indicated. The unaudited pro forma combined results of operations are presented solely for information purposes and are not intended to represent or be indicative of the consolidated results of operations that the Company would have reported had this transaction been completed as of the dates and for the periods presented, nor are they necessarily indicative of future results. In particular, no adjustments have been made to eliminate the amount of HF Financial's provision for loan and lease losses incurred prior to the acquisition date that would not have been necessary had the acquired loans been recorded at fair value as of the beginning of each period indicated. In accordance with Article 11 of SEC Regulation S-X, transaction costs directly attributable to the acquisition have been excluded. Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 (In thousands, except per share data) Net interest income $ 125,539 $ 93,999 $ 316,922 $ 275,746 Net income 35,245 30,795 99,927 77,067 Basic earnings per share 0.62 0.53 1.79 1.33 Fully diluted earnings per share 0.62 0.53 1.78 1.33 In the acquisition, the Company acquired $863.7 million of loans at fair value, net of $28.5 million , or 3.30% , estimated discount to the outstanding principal balance. Of the total loans acquired, management identified $65.4 million that were considered to be credit impaired and are accounted for under ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management's estimate of expected total cash payments and fair value of the loans as of acquisition date for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Amount (In thousands) Contractually required principal and interest $ 83,710 Non-accretable difference (28,516 ) Cash flows expected to be collected 55,194 Accretable yield (3,662 ) Total purchased credit impaired loans acquired $ 51,532 The following table presents the acquired loan data for the HF Financial acquisition. Fair Value of Acquired Loans at Acquisition Date Gross Contractual Amounts Receivable at Acquisition Date Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected (In thousands) Acquired receivables subject to ASC 310-30 $ 51,532 $ 83,710 $ 28,516 Acquired receivables not subject to ASC 310-30 812,209 998,255 9,572

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale	Securities Available for Sale The amortized cost and approximate fair value of investments in securities, all of which are classified as available for sale according to management’s intent, are summarized as follows (in thousands): Amortized Cost Gross Gross Estimated Fair Value As of June 30, 2016 U.S. Treasury securities $ 226,751 $ 5,246 $ — $ 231,997 U.S. Agency securities 49,641 366 — 50,007 Mortgage-backed securities: Government National Mortgage Association 705,180 5,786 (1,388 ) 709,578 Federal National Mortgage Association 178,320 1,814 — 180,134 Small Business Assistance Program 146,746 2,550 — 149,296 States and political subdivision securities 33,934 192 (28 ) 34,098 Corporate debt securities 4,997 2 — 4,999 Other 1,013 42 — 1,055 Total $ 1,346,582 $ 15,998 $ (1,416 ) $ 1,361,164 Amortized Cost Gross Gross Estimated Fair Value As of September 30, 2015 U.S. Treasury securities $ 250,986 $ 3,811 $ — $ 254,797 U.S. Agency securities 74,412 643 — 75,055 Mortgage-backed securities: Government National Mortgage Association 842,460 3,663 (4,503 ) 841,620 Federal National Mortgage Association 46,449 96 — 46,545 Small Business Assistance Program 101,415 233 (213 ) 101,435 States and political subdivision securities 1,849 1 — 1,850 Corporate debt securities 4,996 — (13 ) 4,983 Other 1,006 36 — 1,042 Total $ 1,323,573 $ 8,483 $ (4,729 ) $ 1,327,327 The amortized cost and approximate fair value of debt securities available for sale as of June 30, 2016 and September 30, 2015 , by contractual maturity, are shown below. Maturities of mortgage-backed securities may differ from contractual maturities because the mortgages underlying the securities may be called or repaid without any penalties. June 30, 2016 September 30, 2015 (In Thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 53,129 $ 53,503 $ 76,261 $ 76,905 Due after one year through five years 254,775 260,136 255,982 259,780 Due after five years through ten years 7,297 7,340 — — Due after ten years 122 122 — — 315,323 321,101 332,243 336,685 Mortgage-backed securities 1,030,246 1,039,008 990,324 989,600 Securities without contractual maturities 1,013 1,055 1,006 1,042 Total $ 1,346,582 $ 1,361,164 $ 1,323,573 $ 1,327,327 Proceeds from sales of securities available for sale were $120.9 million and $0.0 million for the three months ended June 30, 2016 and 2015 , respectively, and $145.9 million and $55.1 million for the nine months ended June 30, 2016 and 2015 , respectively. Gross gains (pre-tax) of $0.1 million and $0.0 million and gross losses (pre-tax) of $0.0 million and $0.0 million were realized on the sales for the three months ended June 30, 2016 and 2015 , respectively. Gross gains (pre-tax) of $0.2 million and $0.6 million and gross losses (pre-tax) of $0.0 million and $0.5 million were realized on the sales for the nine months ended June 30, 2016 and 2015 , respectively, using the specific identification method. The Company recognized an other-than-temporary impairment in net loss on sale of securities in the consolidated statements of comprehensive income of $0.0 million and $0.4 million on two security holdings attributable to credit for the three and nine months ended June 30, 2016 . There was no other-than-temporary impairment recognized for the three and nine months ended June 30, 2015 . Securities with an estimated fair value of approximately $1.08 billion and $894.3 million at June 30, 2016 and September 30, 2015 , respectively, were pledged as collateral on public deposits, securities sold under agreements to repurchase, and for other purposes as required or permitted by law. The counterparties do not have the right to sell or pledge the securities the Company has pledged as collateral. As detailed in the following tables, certain investments in debt securities, which are approximately 15% and 36% of the Company’s investment portfolio at June 30, 2016 and September 30, 2015 , respectively, are reported in the consolidated financial statements at an amount less than their amortized cost. Based on evaluation of available evidence, including recent changes in market interest rates, credit rating information, implicit or explicit government guarantees, and information obtained from regulatory filings, management believes the declines in fair value of these securities are temporary. As the Company does not intend to sell the securities and it is not more likely than not that the Company will be required to sell the securities before the recovery of their amortized cost basis, which may be maturity, the Company does not consider the securities to be other-than-temporarily impaired at June 30, 2016 or September 30, 2015 . The following table presents the Company’s gross unrealized losses and approximate fair value in investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands): June 30, 2016 Less than 12 months 12 months or more Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Mortgage-backed securities $ 101 $ (1 ) $ 199,274 $ (1,387 ) $ 199,375 $ (1,388 ) Corporate debt securities — — — — — — States and political subdivision securities 4,393 (28 ) — — 4,393 (28 ) Total $ 4,494 $ (29 ) $ 199,274 $ (1,387 ) $ 203,768 $ (1,416 ) September 30, 2015 Less than 12 months 12 months or more Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Mortgage-backed securities $ 58,604 $ (236 ) $ 412,058 $ (4,480 ) $ 470,662 $ (4,716 ) Corporate debt securities 4,984 (13 ) — — 4,984 (13 ) States and political subdivision securities — — — — — — Total $ 63,588 $ (249 ) $ 412,058 $ (4,480 ) $ 475,646 $ (4,729 ) As of June 30, 2016 and September 30, 2015 , the Company had 30 and 31 securities, respectively, in an unrealized loss position. The majority of the Company’s investments in nonmarketable equity securities are stock of the Federal Home Loan Bank ("FHLB"). The carrying value of Federal Home Loan Bank stock was $48.8 million and $35.7 million as of June 30, 2016 and September 30, 2015 , respectively, and is reported in other assets on the consolidated balance sheets. No indicators of impairment related to FHLB stock were identified during the three and nine months ended June 30, 2016 and 2015 , respectively. The components of accumulated other comprehensive income (loss) from net unrealized gains (losses) on securities available for sale for the three and nine months ended June 30, 2016 and 2015 , respectively are as follows (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance accumulated other comprehensive income (loss) $ 4,709 $ 2,111 $ 2,318 $ (6,157 ) Net unrealized holding gain arising during the period 6,837 (6,099 ) 11,024 7,186 Reclassification adjustment for net gain (loss) realized in net income 134 — (196 ) (51 ) Net change in unrealized gain before income taxes 6,971 (6,099 ) 10,828 7,135 Income tax (expense) (2,649 ) 2,254 (4,115 ) (2,712 ) Net change in unrealized gain on securities after taxes 4,322 (3,845 ) 6,713 4,423 Ending balance accumulated other comprehensive income $ 9,031 $ (1,734 ) $ 9,031 $ (1,734 )

Loans

Loans	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Loans	Loans The composition of loans as of June 30, 2016 and September 30, 2015 , is as follows (in thousands): June 30, 2016 September 30, 2015 Residential real estate $ 1,032,355 $ 921,827 Commercial real estate 3,657,024 2,845,748 Commercial non real estate 1,746,257 1,610,828 Agriculture 2,101,601 1,861,465 Consumer 79,814 73,049 Other 45,444 38,371 Ending balance 8,662,495 7,351,288 Less: Unamortized discount on acquired loans (42,793 ) (19,264 ) Unearned net deferred fees and costs and loans in process (12,728 ) (6,826 ) Total $ 8,606,974 $ 7,325,198 The loan breakouts above include loans covered by FDIC loss sharing agreements totaling $80.1 million and $97.0 million as of June 30, 2016 and September 30, 2015 , respectively, residential real estate loans held for sale totaling $21.3 million and $9.9 million at June 30, 2016 and September 30, 2015 , respectively, and $1.16 billion and $1.12 billion of loans and written loan commitments accounted for at fair value at June 30, 2016 and September 30, 2015 , respectively. Unamortized net deferred fees and costs totaled $7.7 million and $7.5 million as of June 30, 2016 and September 30, 2015 , respectively. Loans in process represent loans that have been funded as of the balance sheet dates but not classified into a loan category and loan payments received as of the balance sheet dates that have not been applied to individual loan accounts. Loans in process totaled $5.0 million and $(0.7) million at June 30, 2016 and September 30, 2015 , respectively. Loans guaranteed by agencies of the U.S. government totaled $128.0 million and $105.0 million at June 30, 2016 and September 30, 2015 , respectively. Principal balances of residential real estate loans sold totaled $64.2 million and $79.5 million for the three months ended June 30, 2016 and 2015 , respectively, and $172.8 million and $213.4 million for the nine months ended June 30, 2016 and 2015 , respectively. Nonaccrual The following table presents the Company’s nonaccrual loans at June 30, 2016 and September 30, 2015 (in thousands), excluding ASC 310-30 loans. Loans greater than 90 days past due and still accruing interest as of June 30, 2016 and September 30, 2015 , were not significant. Nonaccrual loans June 30, 2016 September 30, 2015 Residential real estate $ 5,834 $ 7,642 Commercial real estate 10,331 9,556 Commercial non real estate 11,678 14,281 Agriculture 62,356 24,569 Consumer 88 107 Total $ 90,287 $ 56,155 Credit Quality Information The composition of the loan portfolio by internally assigned grade is as follows as of June 30, 2016 and September 30, 2015 . This table (in thousands) is presented net of unamortized discount on acquired loans and excludes loans measured at fair value with changes in fair value reported in earnings of $1.16 billion at June 30, 2016 and $1.12 billion at September 30, 2015 : As of June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Credit Risk Profile by Internally Assigned Grade Grade: Pass $ 921,503 $ 3,128,241 $ 1,148,620 $ 1,426,550 $ 78,478 $ 45,444 $ 6,748,836 Watchlist 5,212 108,694 69,731 212,049 207 — 395,893 Substandard 10,705 61,864 29,504 135,222 315 — 237,610 Doubtful 103 155 523 — — — 781 Loss — — — — — — — Ending balance 937,523 3,298,954 1,248,378 1,773,821 79,000 45,444 7,383,120 Loans covered by FDIC loss sharing agreements 80,137 — — — — — 80,137 Total $ 1,017,660 $ 3,298,954 $ 1,248,378 $ 1,773,821 $ 79,000 $ 45,444 $ 7,463,257 As of September 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Credit Risk Profile by Internally Assigned Grade Grade: Pass $ 799,359 $ 2,384,980 $ 1,053,091 $ 1,272,312 $ 72,705 $ 38,371 $ 5,620,818 Watchlist 4,890 66,024 50,242 189,144 78 — 310,378 Substandard 11,877 56,905 60,801 53,837 223 — 183,643 Doubtful 323 200 682 256 7 — 1,468 Loss — — — — — — — Ending balance 816,449 2,508,109 1,164,816 1,515,549 73,013 38,371 6,116,307 Loans covered by FDIC loss sharing agreements 97,030 — — — — — 97,030 Total $ 913,479 $ 2,508,109 $ 1,164,816 $ 1,515,549 $ 73,013 $ 38,371 $ 6,213,337 Past Due Loans The following table (in thousands) presents the Company’s past due loans at June 30, 2016 and September 30, 2015 . This table is presented net of unamortized discount on acquired loans and excludes loans measured at fair value with changes in fair value reported in earnings of $1.16 billion at June 30, 2016 and $1.12 billion at September 30, 2015 . As of June 30, 2016 30-59 Days 60-89 Days 90 Days or Greater Past Due Total Current Total Residential real estate $ 1,242 $ 877 $ 1,399 $ 3,518 $ 934,005 $ 937,523 Commercial real estate 42 224 5,433 5,699 3,293,255 3,298,954 Commercial non real estate 182 436 8,589 9,207 1,239,171 1,248,378 Agriculture 4,343 7,972 4,735 17,050 1,756,771 1,773,821 Consumer 157 26 7 190 78,810 79,000 Other — — — — 45,444 45,444 Ending balance 5,966 9,535 20,163 35,664 7,347,456 7,383,120 Loans covered by FDIC loss sharing agreements 849 496 260 1,605 78,532 80,137 Total $ 6,815 $ 10,031 $ 20,423 $ 37,269 $ 7,425,988 $ 7,463,257 As of September 30, 2015 30-59 Days 60-89 Days 90 Days or Greater Past Due Total Current Total Residential real estate $ 486 $ 858 $ 2,776 $ 4,120 $ 812,329 $ 816,449 Commercial real estate 1,708 1,204 4,247 7,159 2,500,950 2,508,109 Commercial non real estate 697 7,944 4,072 12,713 1,152,103 1,164,816 Agriculture 2,161 175 6,264 8,600 1,506,949 1,515,549 Consumer 232 8 37 277 72,736 73,013 Other — — — — 38,371 38,371 Ending balance 5,284 10,189 17,396 32,869 6,083,438 6,116,307 Loans covered by FDIC loss sharing agreements 2,455 594 873 3,922 93,108 97,030 Total $ 7,739 $ 10,783 $ 18,269 $ 36,791 $ 6,176,546 $ 6,213,337 Impaired Loans The following table presents the Company’s impaired loans (in thousands). This table excludes loans covered by FDIC loss sharing agreements: June 30, 2016 September 30, 2015 Recorded Unpaid Related Recorded Unpaid Related Impaired loans: With an allowance recorded: Residential real estate $ 10,983 $ 11,942 $ 3,173 $ 12,364 $ 12,602 $ 2,784 Commercial real estate 69,602 70,665 7,602 67,751 69,722 4,644 Commercial non real estate 31,066 33,260 5,045 65,495 76,647 5,657 Agriculture 135,222 137,479 11,761 54,093 54,699 3,950 Consumer 327 510 69 230 359 50 Total $ 247,200 $ 253,856 $ 27,650 $ 199,933 $ 214,029 $ 17,085 There are no impaired loans without a valuation allowance, other than those loans for which the Company has claim to collateral with value(s) in excess of the outstanding loan amount, after allowing for the cost of liquidating the collateral as of June 30, 2016 and September 30, 2015 . The average recorded investment on impaired loans and interest income recognized on impaired loans for the three and nine months ended June 30, 2016 and 2015 , respectively, are as follows (in thousands): Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 Nine Months Ended Nine Months Ended Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Residential real estate $ 11,743 $ 438 $ 12,413 $ 453 $ 11,899 $ 877 $ 12,336 $ 1,398 Commercial real estate 78,962 3,193 75,665 3,106 76,159 6,666 72,287 9,498 Commercial non real estate 37,322 1,162 49,705 2,308 44,365 2,284 45,409 5,753 Agriculture 118,056 5,359 44,405 1,232 102,065 11,054 42,186 3,019 Consumer 314 38 238 24 293 80 249 75 Total $ 246,397 $ 10,190 $ 182,426 $ 7,123 $ 234,781 $ 20,961 $ 172,467 $ 19,743 Valuation adjustments made to repossessed properties for the three months ended June 30, 2016 and 2015 , totaled $0.5 million and $1.2 million , respectively and $1.0 million and $5.6 million for the nine months ended June 30, 2016 and 2015 , respectively. The adjustments are included in noninterest expense. Troubled Debt Restructurings Included in certain loan categories in the impaired loans are troubled debt restructurings (“TDRs”) that were classified as impaired. These TDRs do not include purchased credit impaired loans. When the Company grants concessions to borrowers such as reduced interest rates or extensions of loan periods that would not be considered other than because of borrowers’ financial difficulties, the modification is considered a TDR. Specific reserves included in the allowance for loan and lease losses for TDRs were $10.0 million and $3.6 million at June 30, 2016 and September 30, 2015 , respectively. Commitments to lend additional funds to borrowers whose loans were modified in a TDR were $0.2 million and $2.3 million as of June 30, 2016 and September 30, 2015 , respectively. The following table presents the recorded value of the Company’s TDR balances as of June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Accruing Nonaccrual Accruing Nonaccrual Residential real estate $ 413 $ 1,090 $ 452 $ 1,547 Commercial real estate 17,851 3,429 30,917 4,725 Commercial non real estate 7,255 1,539 8,928 833 Agriculture 19,610 32,723 20,041 6,857 Consumer 32 9 33 4 Total $ 45,161 $ 38,790 $ 60,371 $ 13,966 The following table presents a summary of all accruing loans restructured in TDRs during the three months ended June 30, 2016 and 2015 , respectively: Three Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — — $ — $ — Term extension 1 42 42 1 35 35 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total residential real estate 1 42 42 1 35 35 Commercial real estate Rate modification — — — — — — Term extension — — — 1 574 574 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — 1 574 574 Commercial non real estate Rate modification — — — — — — Term extension 3 57 57 — — — Payment modification 1 878 878 — — — Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate 4 935 935 — — — Agriculture Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total agriculture — — — — — — Consumer Rate modification — — — — — — Term extension — — — — — — Payment modification — — — 1 18 18 Bankruptcy — — — — — — Other — — — — — — Total consumer — — — 1 18 18 Total accruing 5 $ 977 $ 977 3 $ 627 $ 627 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification — $ — $ — — $ — $ — The following table presents a summary of all accruing loans restructured in TDRs during the nine months ended June 30, 2016 and 2015 , respectively: Nine Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — 1 $ 15 $ 15 Term extension 1 42 42 1 35 35 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — 1 21 21 Total residential real estate 1 42 42 3 71 71 Commercial real estate Rate modification — — — — — — Term extension 2 1,898 1,898 2 664 574 Payment modification — — — 6 22,542 22,542 Bankruptcy — — — 1 498 498 Other 3 6,714 6,714 — — — Total commercial real estate 5 8,612 8,612 9 23,704 23,614 Commercial non real estate Rate modification 1 49 49 1 32 32 Term extension 4 115 115 3 2,879 2,879 Payment modification 2 948 948 2 1,874 1,874 Bankruptcy — — — — — — Other 3 3,849 3,849 — — — Total commercial non real estate 10 4,961 4,961 6 4,785 4,785 Agriculture Rate modification — — — — — — Term extension 13 26,914 26,914 — — — Payment modification 4 989 989 — — — Bankruptcy — — — — — — Other — — — — — — Total agriculture 17 27,903 27,903 — — — Consumer Rate modification — — — — — — Term extension — — — — — — Payment modification — — — 1 18 18 Bankruptcy — — — 1 6 6 Other — — — — — — Total consumer — — — 2 24 24 Total accruing 33 $ 41,518 $ 41,518 20 $ 28,584 $ 28,494 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification — $ — $ — 1 $ 90 $ — The following table presents a summary of all non-accruing loans restructured in TDRs during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — — $ — $ — Term extension — — — 1 — — Payment modification 1 50 49 1 19 19 Bankruptcy — — — — — — Other — — — 1 25 10 Total residential real estate 1 50 49 3 44 29 Commercial real estate Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — — — — Commercial Non Real Estate Rate modification — — — — — — Term extension — — — 1 77 — Payment modification — — — 1 4 4 Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate — — — 2 81 4 Agriculture Rate modification — — — — — — Term extension 1 101 100 — — — Payment modification 4 932 887 — — — Bankruptcy — — — — — — Other 1 96 96 — — — Total agriculture 6 1,129 1,083 — — — Consumer Rate modification — — — — — — Term extension — — — 1 1 1 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total consumer — — — 1 1 1 Total non-accruing 7 $ 1,179 $ 1,132 6 $ 126 $ 34 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification 7 $ 47 $ — 2 $ 92 $ — The following table presents a summary of all non-accruing loans restructured in TDRs during the nine months ended June 30, 2016 and 2015 : Nine Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — 2 $ 104 $ 104 Term extension — — — 2 77 77 Payment modification 2 237 236 1 19 19 Bankruptcy — — — 1 43 43 Other — — — 1 25 10 Total residential real estate 2 237 236 7 268 253 Commercial real estate Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — — — — Commercial Non Real Estate Rate modification — — — — — — Term extension — — — 5 294 217 Payment modification 2 760 760 1 4 4 Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate 2 760 760 6 298 221 Agriculture Rate modification — — — — — — Term extension 1 101 100 — — — Payment modification 4 932 887 — — — Bankruptcy — — — — — — Other 1 96 96 — — — Total agriculture 6 1,129 1,083 — — — Consumer Rate modification — — — — — — Term extension — — — 2 2 2 Payment modification — — — — — — Bankruptcy 1 8 8 — — — Other — — — — — — Total consumer 1 8 8 2 2 2 Total non-accruing 11 $ 2,134 $ 2,087 15 $ 568 $ 476 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification 7 $ 47 $ — 2 $ 92 $ — The tables below represent defaults on loans that were first modified during the respective past 12 months, that became 90 days or more delinquent or were charged-off during the three and nine months ended June 30, 2016 and 2015 , respectively. Three Months Ended Nine Months Ended 2016 2015 2016 2015 ($ in thousands) Number of Recorded Number of Recorded Number of Recorded Number of Recorded Residential real estate — $ — 1 $ 10 1 $ — 4 $ 353 Commercial real estate — — — — — — — — Commercial non real estate 2 275 2 32 2 275 4 32 Agriculture 1 760 3 782 3 760 3 782 Consumer — — — — — — — — Total 3 $ 1,035 6 $ 824 6 $ 1,035 11 $ 1,167 The majority of loans that were modified and subsequently became 90 days or more delinquent have remained on nonaccrual status since the time of modification. For the three months ended June 30, 2016 , there were $17.9 million of loans removed from TDR status as they were restructured at market terms and are performing. There were no significant loans removed from TDR status for the three months ended June 30, 2015 .

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses The following tables presents the Company’s allowance for loan and lease losses roll forward for the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance April 1, 2016 $ 8,796 $ 20,904 $ 12,631 $ 18,323 $ 336 $ 927 $ 61,917 Charge-offs (257 ) (291 ) (1,936 ) (1,133 ) (37 ) (497 ) (4,151 ) Recoveries 133 77 235 262 61 337 1,105 Provision (778 ) (713 ) 1,200 5,634 79 304 5,726 (Improvement) impairment of ASC 310-30 loans (205 ) (149 ) — — — — (354 ) Ending balance June 30, 2016 $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Three Months Ended June 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance April 1, 2015 $ 7,495 $ 15,736 $ 15,957 $ 12,222 $ 189 $ 827 $ 52,426 Charge-offs (77 ) (280 ) (1,337 ) (411 ) (31 ) (356 ) (2,492 ) Recoveries 84 205 949 10 32 306 1,586 Provision (325 ) 2,130 1,381 1,545 164 96 4,991 (Improvement) impairment of (625 ) 45 — — (1 ) — (581 ) Ending balance June 30, 2015 $ 6,552 $ 17,836 $ 16,950 $ 13,366 $ 353 $ 873 $ 55,930 Nine Months Ended June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance October 1, $ 8,025 $ 18,014 $ 15,996 $ 13,952 $ 348 $ 865 $ 57,200 Charge-offs (959 ) (1,063 ) (2,193 ) (2,257 ) (183 ) (1,494 ) (8,149 ) Recoveries 472 568 875 386 131 868 3,300 Provision 463 2,547 (2,478 ) 11,005 143 832 12,512 (Impairment) improvement of (312 ) (238 ) (70 ) — — — (620 ) Ending balance June 30, 2016 $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Nine Months Ended June 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance October 1, $ 8,342 $ 16,884 $ 10,550 $ 10,655 $ 264 $ 823 $ 47,518 Charge-offs (197 ) (1,932 ) (9,861 ) (438 ) (88 ) (1,187 ) (13,703 ) Recoveries 197 300 3,092 89 79 950 4,707 Provision (515 ) 2,476 13,169 3,060 123 287 18,600 (Impairment) improvement of (1,275 ) 108 — — (25 ) — (1,192 ) Ending balance June 30, 2015 $ 6,552 $ 17,836 $ 16,950 $ 13,366 $ 353 $ 873 $ 55,930 The following tables provide details regarding the allowance for loan and lease losses and balance by type of allowance. These tables (in thousands) are presented net of unamortized discount on acquired loans and excludes loans of $1.16 billion measured at fair value (and the associated credit mark embedded within the carrying value of these loans) with changes in fair value reported in earnings, loans held for sale of $21.3 million , and guaranteed loans of $128.0 million for June 30, 2016 and loans measured at fair value with changes in fair value reported in earnings of $1.12 billion , loans held for sale of $9.9 million , and guaranteed loans of $105.0 million for September 30, 2015 . As of June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Allowance for loan and lease losses Individually evaluated for impairment $ 3,172 $ 7,570 $ 5,038 $ 11,761 $ 69 $ — $ 27,610 Collectively evaluated for impairment 3,216 11,414 7,092 11,325 370 1,071 34,488 ASC 310-30 loans 1,301 844 — — — — 2,145 Total allowance $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Financing Receivables Individually evaluated for impairment $ 10,413 $ 47,576 $ 29,681 $ 100,641 $ 281 $ — $ 188,592 Collectively evaluated for impairment 914,322 3,132,124 1,170,544 1,646,828 77,710 45,444 6,986,972 ASC 310-30 loans 70,993 45,670 4,591 16,115 1,009 — 138,378 Loans Outstanding $ 995,728 $ 3,225,370 $ 1,204,816 $ 1,763,584 $ 79,000 $ 45,444 $ 7,313,942 As of September 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Allowance for loan and lease losses Individually evaluated for impairment $ 2,783 $ 4,585 $ 5,624 $ 3,950 $ 50 $ — $ 16,992 Collectively evaluated for impairment 3,618 12,347 10,302 10,002 298 865 37,432 ASC 310-30 loans 1,624 1,082 70 — — — 2,776 Total allowance $ 8,025 $ 18,014 $ 15,996 $ 13,952 $ 348 $ 865 $ 57,200 Financing Receivables Individually evaluated for impairment $ 13,106 $ 49,794 $ 62,158 $ 44,253 $ 193 $ — $ 169,504 Collectively evaluated for impairment 806,912 2,385,636 1,056,806 1,461,230 71,549 38,371 5,820,504 ASC 310-30 loans 82,189 20,710 2,759 1,538 1,271 — 108,467 Loans Outstanding $ 902,207 $ 2,456,140 $ 1,121,723 $ 1,507,021 $ 73,013 $ 38,371 $ 6,098,475 The Company maintains an ALLL for acquired loans accounted for under ASC 310-30 as a result of impairment to loan pools arising from the periodic re-valuation of these loans. Any impairment in the individual pool is generally recognized in the current period as provision for loan and lease losses. Any improvement in the estimated cash flows, is generally not recognized immediately, but is instead reflected as an adjustment to the related loan pools yield on a prospective basis once any previously recorded impairment has been recaptured. The ALLL for ASC 310-30 loans totaled $2.1 million at June 30, 2016 , compared to $2.8 million at September 30, 2015 . During the three and nine month period ended June 30, 2016 , loan pools accounted for under ASC 310-30 had a net reversal of provision of $0.4 million and $0.6 million , respectively, as a result of increases in expected cash flows. Net provision reversals for the three and nine month period ended June 30, 2015 totaled $0.6 million and $1.2 million , and were driven a result of increases in expected cash flows in the residential real estate pool. For acquired loans not accounted for under ASC 310-20 (purchased non-credit impaired), the Company utilizes specific and collective reserve calculation methods similar to originated loans. The required ALLL for these loans is included in the individually evaluated for impairment bucket of the ALLL if the loan is rated substandard or worse, and in the collectively evaluated for impairment bucket for pass rated loans. The reserve for unfunded loan commitments was $0.5 million at June 30, 2016 and $0.4 million at September 30, 2015 and is recorded in other liabilities on the consolidated balance sheets.

Accounting for Certain Loans Ac

Accounting for Certain Loans Acquired with Deteriorated Credit Quality	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Accounting for Certain Loans Acquired with Deteriorated Credit Quality	Accounting for Certain Loans Acquired with Deteriorated Credit Quality In June 2010 and May 2016, the Company acquired certain loans that had deteriorated credit quality (ASC 310-30 loans). Loan accounting specific to these purchased credit impaired loans addresses differences between contractual cash flows expected to be collected from the initial investment in loans if those differences are attributable, at least in part, to credit quality. Several factors were considered when evaluating whether a loan was considered a purchased credit impaired loan, including the delinquency status of the loan, updated borrower credit status, geographic information, and updated loan-to-values (“LTV”). U.S. GAAP allows purchasers to aggregate purchased credit impaired loans acquired in the same fiscal quarter in one or more pools, provided that the loans have common risk characteristics. A pool is then accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Loan pools are periodically reassessed to determine expected cash flows. In determining the expected cash flows, the timing of cash flows and prepayment assumptions for smaller, homogeneous loans are based on statistical models that take into account factors such as the loan interest rate, credit profile of the borrowers, the years in which the loans were originated, and whether the loans are fixed or variable rate loans. Prepayments may be assumed on large individual loans that consider similar prepayment factors listed above for smaller homogeneous loans. The re-assessment of purchased credit impaired loans resulted in the following changes in the accretable yield during the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Balance at beginning of period $ 39,843 $ 43,431 $ 44,489 $ 50,889 Acquisition 3,662 — 3,662 — Accretion (2,529 ) (3,240 ) (7,119 ) (11,249 ) Reclassification from (to) nonaccretable difference — 7,736 (56 ) 8,367 Disposals — (1,038 ) — (1,118 ) Balance at end of period $ 40,976 $ 46,889 $ 40,976 $ 46,889 The reclassification from nonaccretable difference noted in the table above represents instances where specific pools of loans are expected to perform better over the remaining lives of the loans than expected at the prior re-assessment date. The reclassification to nonaccretable difference noted in the table above represents instances where specific pools of loans are estimated to have a shortfall in the expected future cash flows compared to the contractual cash flows at the prior re-assessment date. The following table provides purchased credit impaired loans at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Outstanding 1 Recorded 2 Carrying 3 Outstanding 1 Recorded 2 Carrying 3 Residential real estate $ 83,624 $ 70,993 $ 69,692 $ 93,979 $ 82,189 $ 80,565 Commercial real estate 131,309 45,670 44,826 97,302 20,710 19,628 Commercial non real estate 11,819 4,591 4,591 10,387 2,759 2,689 Agriculture 20,042 16,115 16,115 1,538 1,538 1,538 Consumer 1,178 1,009 1,009 1,368 1,271 1,271 Total lending $ 247,972 $ 138,378 $ 136,233 $ 204,574 $ 108,467 $ 105,691 1 Represents the legal balance of loans acquired with deteriorated credit quality. 2 Represents the book balance of loans acquired with deteriorated credit quality. 3 Represents the book balance of loans acquired with deteriorated credit quality net of the related allowance for loan and lease losses. Due to improved cash flows of the purchased credit impaired loans, the reductions to allowance recognized on previous impairments were $0.4 million and $0.9 million for the three months ended June 30, 2016 and 2015 , respectively and $0.6 million and $1.9 million for the nine months ended June 30, 2016 and 2015 , respectively.

FDIC Indemnification Asset

FDIC Indemnification Asset	9 Months Ended
	Jun. 30, 2016
Banking and Thrift [Abstract]
FDIC Indemnification Asset	FDIC Indemnification Asset Under the terms of the purchase and assumption agreement with the FDIC with regard to the TierOne Bank acquisition, the Company is reimbursed for a portion of the losses incurred on covered assets. As covered assets are resolved, whether it be through repayment, short sale of the underlying collateral, the foreclosure on or sale of collateral, or the sale or charge-off of loans or OREO, any differences between the carrying value of the covered assets versus the payments received during the resolution process, that are reimbursable by the FDIC, are recognized as reductions in the FDIC indemnification asset. Any gains or losses realized from the resolution of covered assets reduce or increase, respectively, the amount recoverable from the FDIC. The following table represents a summary of the activity related to the FDIC indemnification asset for the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Balance at beginning of period $ 12,875 $ 19,895 $ 14,722 $ 26,678 Amortization (959 ) (1,754 ) (2,886 ) (6,347 ) Changes in expected reimbursements from FDIC for changes in expected credit losses (14 ) 15 (141 ) (175 ) Changes in reimbursable expenses (268 ) (1,148 ) (695 ) (1,511 ) Payments (reimbursements) of covered losses from the FDIC 72 (29 ) 706 (1,666 ) Balance at end of period $ 11,706 $ 16,979 $ 11,706 $ 16,979 The loss claims filed are subject to review, approval, and annual audits by the FDIC or its assigned agents for compliance with the terms in the loss sharing agreements. The non-commerical loss share agreement ends June 4, 2020.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments In the normal course of business, the Company uses interest rate swaps to manage its interest rate risk and market risk in accommodating the needs of its customers. Also, the Company enters into interest rate lock commitments on mortgage loans to be held for sale, with corresponding forward sales contracts related to these interest rate lock commitments. Derivative instruments are recognized as either assets or liabilities in the accompanying consolidated financial statements and are measured at fair value. The following table summarizes the notional amounts and estimated fair values of the Company’s derivative instruments at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 Notional Balance Sheet Positive Fair Negative Fair Derivatives not designated as hedging instruments: Interest rate swaps $ 1,071,795 Liabilities $ — $ (91,066 ) Mortgage loan commitments 57,704 Assets 253 — Mortgage loan forward sale contracts 75,195 Liabilities — (253 ) September 30, 2015 Notional Balance Sheet Positive Fair Negative Fair Derivatives not designated as hedging instruments: Interest rate swaps $ 1,087,505 Liabilities $ 41 $ (53,559 ) Mortgage loan commitments 30,196 Assets 95 — Mortgage loan forward sale contracts 36,655 Liabilities — (95 ) As with any financial instrument, derivative financial instruments have inherent risk including adverse changes in interest rates. The Company’s exposure to derivative credit risk is defined as the possibility of sustaining a loss due to the failure of the counterparty to perform in accordance with the terms of the contract. Credit risks associated with interest rate swaps are similar to those relating to traditional on-balance sheet financial instruments. The Company manages interest rate swap credit risk with the same standards and procedures applied to its commercial lending activities. Amounts due from swap counterparties to reclaim cash collateral under the interest rate swap master netting arrangements have not been offset against the derivative balances. Credit-risk-related contingent features The Company has agreements with its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty has the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of June 30, 2016 , the termination value of derivatives in a net liability position related to these agreements was $93.4 million which includes accrued interest but excludes any adjustment for nonperformance risk. The Company has minimum collateral posting thresholds with its derivative counterparties and as of June 30, 2016 , the Company had posted $101.6 million in eligible collateral. The effect of derivatives on the consolidated statements of comprehensive income for the three and nine months ended June 30, 2016 and 2015 (in thousands) was as follows: Amount of Gain (Loss) Recognized in Income Three Months Ended Nine Months Ended Location of 2016 2015 2016 2015 Derivatives not designated as hedging instruments: Interest rate swaps Noninterest income $ (21,925 ) $ 18,946 $ (53,379 ) $ (27,357 ) Mortgage loan commitments Noninterest income 201 (26 ) 253 1 Mortgage loan forward sale contracts Noninterest income (201 ) 26 (253 ) (1 ) Netting of Derivatives The Company has various financial assets and financial liabilities that are subject to enforceable master netting agreements or similar agreements. The Company has entered into an ISDA master netting arrangement with various swap counterparties. Under the terms of the master netting arrangements, all transactions between the Company and the counterparty constitute a single business relationship such that in the event of default, the non-defaulting party is entitled to set off claims and apply property held by that party in respect of any transaction against obligations owed. Any payments, deliveries, or other transfers may be applied against each other and netted. The following tables (in thousands) present the Company's total gross derivative assets and liabilities at June 30, 2016 and September 30, 2015 , which are adjusted on an aggregate basis, where applicable, to take into consideration the effects of legally enforceable master netting agreements for the net reported amount in the consolidated balance sheets. These amounts are offset on the consolidated balance sheets. Gross Amount Net Amount Held/Pledged 1 Net June 30, 2016 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ — $ — $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (91,066 ) — (91,066 ) 91,066 — Total derivative financial liabilities $ (91,066 ) $ — $ (91,066 ) $ 91,066 $ — 1 The actual amount of collateral exceeds the fair value exposure, at the individual counterparty level, as of the date presented. Gross Amount Net Amount Held/Pledged Net September 30, 2015 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ 41 $ (41 ) $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (53,559 ) 41 (53,518 ) 53,518 — Total derivative financial liabilities $ (53,518 ) $ — $ (53,518 ) $ 53,518 $ —

The Fair Value Option For Certa

The Fair Value Option For Certain Loans	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
The Fair Value Option For Certain Loans	The Fair Value Option For Certain Loans The Company has elected to measure certain long-term loans and written loan commitments at fair value to assist in managing the interest rate risk for longer-term loans. This fair value option was elected upon the origination of these loans. Interest income is recognized in the same manner as interest on non-fair value loans. See Note 19 for additional disclosures regarding the fair value of the fair value option loans and written loan commitments. Long-term loans and written loan commitments for which the fair value option has been elected had a net favorable difference between the aggregate fair value and the aggregate unpaid loan principal balance and written loan commitment amount of approximately $83.0 million and $47.8 million at June 30, 2016 and September 30, 2015 , respectively. The total unpaid principal balance of these long-term loans was approximately $1.07 billion and $1.07 billion at June 30, 2016 and September 30, 2015 , respectively. The fair value of these loans and written loan commitments is included in total loans in the consolidated balance sheets and are grouped with commercial non real estate, commercial real estate, and agricultural loans in Note 5. The fair value of these written loan commitments was not material at June 30, 2016 and September 30, 2015 , respectively. As of June 30, 2016 and September 30, 2015 , there were loans with a fair value of $9.0 million and $1.5 million , respectively, which were greater than 90 days past due or in nonaccrual status with an unpaid principal balance of $11.0 million and $1.7 million , respectively. Changes in fair value for items for which the fair value option has been elected and the line items in which these changes are reported within the consolidated statements of comprehensive income are as follows for the three and nine months ended June 30, 2016 and 2015 (in thousands): For the Three Months Ended For the Nine Months Ended June 30, 2016 June 30, 2015 June 30, 2016 June 30, 2015 Noninterest Total Changes Noninterest Total Changes Noninterest Total Changes Noninterest Total Changes Long-term loans and written loan commitments $ 14,197 $ 14,197 $ (24,394 ) $ (24,394 ) $ 35,252 $ 35,252 $ 7,914 $ 7,914 For long-term loans and written loan commitments, $2.7 million and $0.0 million for the three months ended June 30, 2016 and 2015 , respectively, and $2.3 million and $0.5 million for the nine months ended June 30, 2016 and 2015 , respectively, of the total change in fair value is attributable to changes in specific credit risk. The gains or losses attributable to changes in instrument-specific credit risk were determined based on an assessment of existing market conditions and credit quality of the underlying loan for the specific portfolio of loans.

Goodwill

Goodwill	9 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill A summary of changes to the carrying amount of goodwill is as follows (in thousands): June 30, 2016 September 30, 2015 Balance, beginning of period $ 697,807 $ 697,807 Goodwill acquired during the period 40,653 — Balance, end of period $ 738,460 $ 697,807 The goodwill acquired in 2016 was a result of the HF Financial acquisition. See Note 3 for further information.

Core Deposits and Other Intangi

Core Deposits and Other Intangibles	9 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Core Deposits and Other Intangibles	Core Deposits and Other Intangibles A summary of intangible assets subject to amortization is as follows (in thousands): Core Deposit Brand Customer Other Intangible Total As of June 30, 2016 Gross carrying amount $ 100,018 $ 8,464 $ 16,089 $ 538 $ 125,109 Accumulated amortization (92,455 ) (4,559 ) (15,326 ) (12 ) (112,352 ) Net intangible assets $ 7,563 $ 3,905 $ 763 $ 526 $ 12,757 As of September 30, 2015 Gross carrying amount $ 92,679 $ 8,464 $ 16,089 $ — $ 117,232 Accumulated amortization (92,073 ) (4,136 ) (13,904 ) — (110,113 ) Net intangible assets $ 606 $ 4,328 $ 2,185 $ — $ 7,119 Amortization expense of intangible assets was $0.7 million and $1.8 million for the three months ended June 30, 2016 and 2015 , respectively, and $2.1 million and $6.4 million for the nine months ended June 30, 2016 and 2015 , respectively. The estimated amortization expense of intangible assets assumes no activities, such as acquisitions, which would result in additional amortizable intangible assets. Estimated amortization expense of intangible assets in subsequent fiscal years is as follows (in thousands): Remaining in 2016 $ 1,024 2017 2,342 2018 1,614 2019 1,489 2020 1,363 2021 and thereafter 4,925 Total $ 12,757

Loan Servicing Rights

Loan Servicing Rights	9 Months Ended
	Jun. 30, 2016
Transfers and Servicing [Abstract]
Loan Servicing Rights	Loan Servicing Rights Mortgage loans serviced for others are not included in the accompanying consolidated statements of financial condition. The following table is the activity for loan servicing rights and the related valuation allowance (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Loan servicing rights, beginning of period $ — $ — $ — $ — Acquired in HF Financial acquisition 6,573 — 6,573 — Additions — — — — Amortization (1) (166 ) — (166 ) — Loan servicing rights, end of period $ 6,407 $ — $ 6,407 $ — Valuation allowance, beginning of period $ — $ — $ — $ — Additions / (reductions) (1) (176 ) — (176 ) — Valuation allowance, end of period $ (176 ) $ — $ (176 ) $ — Loan servicing rights, net $ 6,231 $ — $ 6,231 $ — Servicing fees received $ 306 $ — $ 306 $ — Balance of loans serviced at: Beginning of period — — — — End of period 914,694 — 914,694 — (1) Changes to carrying amounts are reported net of loan servicing income on the consolidated statements of comprehensive income for the periods presented. Amortization of servicing rights is adjusted each quarter based upon analysis of portfolio attributes and factors, including an evaluation of historical prepayment activity and prospective industry consensus data. An independent third party is utilized to calculate the amortization and valuation based upon specific loan characteristics, prepayment speeds generated from a validation model utilizing both empirical and market derived data and discount rates. At June 30, 2016 , the constant prepayment rates (CPR) used to calculate the amortization averaged 16.4% . For valuation purposes, an average discount rate of 11.6% was utilized at June 30, 2016 . Based on the Company's analysis of mortgage servicing rights, a $0.2 million valuation reserve was recorded at June 30, 2016 and $0.0 million at June 30, 2015 .

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	9 Months Ended
	Jun. 30, 2016
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase Securities sold under agreements to repurchase generally mature overnight following the transaction date. Securities underlying the agreements had an amortized cost of approximately $161.8 million and $180.6 million and fair value of approximately $163.0 million and $181.6 million at June 30, 2016 and September 30, 2015 , respectively. In most cases, the Company over-collateralizes the repurchase agreements at 102% of total funds borrowed to protect the purchaser from changes in market value. Additionally, the Company utilizes held-in-custody procedures to ensure the securities sold under repurchase agreements are unencumbered. The following tables present the gross obligation by the class of collateral pledged and the remaining contractual maturity of the agreements at June 30, 2016 and September 30, 2015 (in thousands). June 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements U.S. Treasury and agency $ — $ — $ — $ — $ — Mortgage-backed securities 156,072 — — 2,944 159,016 Total repurchase agreements $ 156,072 $ — $ — $ 2,944 $ 159,016 September 30, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements U.S. Treasury and agency $ 64,252 $ — $ — $ — $ 64,252 Mortgage-backed securities 118,147 — — 2,872 121,019 Total repurchase agreements $ 182,399 $ — $ — $ 2,872 $ 185,271

FHLB Advances and Other Borrowi

FHLB Advances and Other Borrowings	9 Months Ended
	Jun. 30, 2016
Federal Home Loan Banks [Abstract]
FHLB Advances and Other Borrowings	FHLB Advances and Other Borrowings FHLB advances and other borrowings consist of the following at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Notes payable to Federal Home Loan Bank (FHLB), interest rates from 0.43% to 3.66% and maturity dates from October 2016 to July 2023, collateralized by real estate loans and FHLB stock, with various call dates at the option of the FHLB $ 520,000 $ 581,000 Federal Home Loan Bank fed funds advance, interest rate of 0.42% to 0.52%, maturity dates from July 2016 to September 2016 393,155 — Other 173 — Total 913,328 581,000 Fair value adjustment (1) 49 — Total FHLB advances and other borrowings $ 913,377 $ 581,000 (1) Adjustment reflects the fair value adjustments related to the FHLB advances and notes payable assumed as part of the HF Financial acquisition. The Company has a $10.0 million revolving line of credit with Wells Fargo, which expires on July 28, 2017 . The line of credit has an interest rate of 1 Month LIBOR plus 200 basis points, with interest payable monthly. There is also an unused line fee of .20% on the unused portion which is payable quarterly. The interest rate was 2.47% at June 30, 2016 . There were $0.0 million outstanding advances on this line of credit at June 30, 2016 and September 30, 2015 . As of June 30, 2016 , based on its Federal Home Loan Bank stock holdings, the combined aggregate additional borrowing capacity of the Company with the Federal Home Loan Bank was $684.7 million . Principal balances of loans pledged to the Federal Home Loan Bank to collateralize notes payable totaled $3.11 billion and $2.29 billion at June 30, 2016 and September 30, 2015 , respectively. As of June 30, 2016 , FHLB advances and other borrowings are due or callable (whichever is earlier) in subsequent fiscal years as follows (in thousands): Remaining in 2016 $ 393,328 2017 29,000 2018 31,000 2019 — 2020 — 2021 and thereafter 460,000 Total $ 913,328

Subordinated Debentures and Sub

Subordinated Debentures and Subordinated Notes Payable	9 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Subordinated Debentures and Subordinated Notes Payable	Subordinated Debentures and Subordinated Notes Payable Junior Subordinated Deferrable Interest Debentures The Company has caused seven trusts to be created (or assumed as part of the HF Financial and Sunstate Bank acquisitions) that have issued and outstanding 78,400 shares, $1,000 par value, of Company Obligated Mandatorily Redeemable Preferred Securities (the "Preferred Securities"). These seven trusts were established and exist for the sole purpose of issuing the Preferred Securities and investing the proceeds in junior subordinated deferrable interest debentures (the "Debentures") issued by the Company. The Debentures constitute the sole assets of the seven trusts. The Preferred Securities provide for cumulative cash distributions calculated at a rate based on three-month LIBOR plus a range from 1.48% to 3.35% adjusted quarterly. The Company may, at one or more times, defer interest payments on the Debentures for up to 20 consecutive quarters following suspension of dividends on all capital stock, but not beyond the respective maturity date. At the end of any deferral period, all accumulated and unpaid interest must be paid. The Debentures have redemption dates ranging from January 7, 2033 to October 1, 2037; however, the Company has the option to shorten the respective maturity date for all seven Preferred Securities as the call option date has passed. Holders of the Preferred Securities have no voting rights. The Preferred Securities are unsecured and rank junior in priority of the payment to all of the Company's indebtedness and senior to the Company's common and preferred stock. The trusts’ ability to pay amounts due on the Preferred Securities is solely dependent upon the Company making payment on the related Debentures. The Company’s obligation under the Debentures and relevant trust agreements constitute a full, irrevocable, and unconditional guarantee on a subordinated basis by it of the obligations of the trusts under the Preferred Securities. For regulatory purposes the Debentures qualify as elements of capital. $77.1 million and $56.1 million of Debentures were eligible for treatment as Tier 1 capital, respectively, as of June 30, 2016 and 2015 . Relating to the trusts, the Company held as assets $2.5 million and $1.7 million in common shares at June 30, 2016 and 2015 , respectively, which are included in other assets on the consolidated balance sheets. Subordinated Notes Payable In 2015, the Company issued $35.0 million of 4.875% fixed-to-floating rate subordinated notes that mature on August 15, 2025 through a private placement. The notes, which qualify as Tier 2 capital under capital rules in effect at June 30, 2016, have an interest rate of 4.875% per annum, payable semi-annually on each February 15 and August 15, which commenced on February 15, 2016 until August 15, 2020. From August 15, 2020, to but excluding the maturity date or date of earlier redemption, the notes will bear interest at a rate per annum equal to to three-month LIBOR for the related interest period plus 3.15% , payable quarterly on each November 15, February 15, April 15 and August 15. The notes are subordinated in right of payment to all of the Company's senior indebtedness and effectively subordinated to all existing and future debt and all other liabilities of the Company's subsidiary bank. The Company may elect to redeem the notes (subject to regulatory approval), in whole or in part, on any early redemption date which is any interest payment date on or after August 15, 2020 at a redemption price equal to 100% of the principal amount plus any accrued and unpaid interest. Other than on an early redemption date, the notes cannot be accelerated except in the event of bankruptcy or the occurrence of certain other events of bankruptcy, insolvency or reorganization. Proceeds from the private placement of subordinated notes repaid outstanding subordinated debt. Subordinated debentures and subordinated notes payable are summarized as follows (in thousands): June 30, 2016 September 30, 2015 Amount outstanding Common Shares Held in Other Assets Amount outstanding Common Shares Held in Other Assets Junior subordinated debentures payable to nonconsolidated trusts GW Statutory Trust IV, variable rate of 2.85%, plus 3 month LIBOR $ 23,093 $ 693 $ 23,093 $ 693 GW Statutory Trust VI, variable rate of 1.48%, plus 3 month LIBOR 30,928 928 30,928 928 SSB Trust II, variable rate of 1.85%, plus 3 month LIBOR 2,062 62 2,062 62 HFB Trust III, variable rate of 3.35%, plus 3 month LIBOR 5,155 155 — — HFB Trust IV, variable rate of 3.10%, plus 3 month LIBOR 7,217 217 — — HFB Trust V, variable rate of 1.83%, plus 3 month LIBOR 10,310 310 — — HFB Trust VI, variable rate of 1.65%, plus 3 month LIBOR 2,155 155 — — Total junior subordinated debentures payable 80,920 $ 2,520 56,083 $ 1,683 Less: fair value adjustment (1) (3,792 ) — Total junior subordinated debentures payable, net of fair value adjustment 77,128 56,083 Subordinated notes payable Fixed to floating rate, 4.875% per annum 35,000 35,000 Less: unamortized debt issuance costs (301 ) (356 ) Total subordinated notes payable 34,699 34,644 Total subordinated debentures and subordinated notes payable $ 111,827 $ 90,727 (1) Adjustment reflects the fair value adjustments related to the junior subordinated deferrable interest debentures assumed as part of the HF Financial acquisition.

Profit-Sharing Plan and Defined

Profit-Sharing Plan and Defined Benefit Plans	9 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Profit-Sharing Plan and Defined Benefit Plans	Profit-Sharing and Defined Benefit Plans Profit Sharing Plan The Company participates in a multiple employer 401(k) profit sharing plan (the Plan). All employees are eligible to participate, beginning with the first day of the month coincident with or immediately following the completion of one year of service and having reached the age of 21 . In addition to employee contributions, the Company may contribute discretionary amounts for eligible participants. Contribution rates for participating employees must be equal. The Company contributed $1.2 million and $1.1 million to the Plan for the three months ended June 30, 2016 and 2015 , respectively and $3.2 million and $2.9 million for the nine months ended June 30, 2016 and 2015 , respectively. Defined Benefit Plan The Company acquired a noncontributory (cash balance) defined benefit pension plan from HF Financial which covers employees of HF Financial and its wholly-owned subsidiaries. Effective July 1, 2015, the Company froze the plan which eliminates future contributions for qualified individuals. The plan has not been terminated, so the plan continues to exist with related benefit obligations and plan assets for those vested within the plan. Information relative to the components of net periodic benefit cost measured at/or for the three and nine months ended June 30, 2016 and 2015 for the defined benefit plan is presented below (in thousands): Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Net periodic benefit cost Service cost $ 8 $ — $ 8 $ — Interest cost 109 — 109 — Expected return on plan assets (95 ) — (95 ) — Amortization of prior losses — — — — Net periodic benefit cost $ 22 $ — $ 22 $ — The Company does not anticipate funding any contributions for fiscal 2016.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation On September 26, 2014, the Board of Directors adopted, and on October 10, 2014, NAB, at that time our controlling shareholder, approved the Great Western Bancorp, Inc. 2014 Omnibus Incentive Compensation Plan (the “2014 Plan”), the Great Western Bancorp, Inc. 2014 Non-Employee Director Plan (the “2014 Director Plan”), and the Great Western Bancorp, Inc. Executive Incentive Compensation Plan (the “Bonus Plan”), collectively ("the Plans"), which provide for the issuance of restricted share units and performance based share units to certain officers, employees and directors of the Company. The Plans were primarily established to enhance the Company’s ability to attract, retain and motivate employees. The Company’s Board of Directors, the Compensation Committee of the Board of Directors ("Compensation Committee"), or executive management upon delegation of the Compensation Committee has exclusive authority to select the employees and others, including directors, to receive the awards and to establish the terms and conditions of each award made pursuant to the Company’s stock-based compensation plans. Stock units issued under the Company’s restricted and performance based stock plans may not be sold or otherwise transferred until the vesting period (typically 3 years) has been met and/or performance objectives have been obtained. During the vesting periods, participants do not have voting rights and dividends are accumulated until the time upon which the award vests. Upon specified events, as defined in the Plans, stock unit awards that have not vested and/or performance hurdles that have not been met will be forfeited. Based on the substantive terms of each award, restricted and performance-based awards are classified as equity awards and accounted for under the Treasury method. The fair value of equity-classified awards is based on the market price of the stock on the measurement date and is amortized as compensation expense on a straight-line basis over the vesting or performance period. Stock based compensation is recognized based on the number of awards that are ultimately expected to vest. Forfeitures are estimated based on historical turnover experience of qualified employees. For performance-based stock awards, an estimate is made of the number of shares expected to vest as a result of actual performance against the performance targets to determine the amount of compensation expense to be recognized. The estimate is reevaluated quarterly and total compensation expense is adjusted for any change in the current period. Stock-based compensation expense is included in salaries and employee benefits expense in the consolidated statements of comprehensive income. For the three months ended June 30, 2016 and 2015 , stock compensation expense was $0.9 million and $0.3 million , respectively. For the nine months ended June 30, 2016 and 2015 , stock compensation expense was $2.7 million and $1.0 million , respectively. Related income tax benefits recognized were $0.3 million and $0.1 million for the three months ended June 30, 2016 and 2015 , respectively and $1.0 million and $0.4 million for the nine months ended June 30, 2016 and 2015 , respectively. The following is a summary of the Plans’ restricted share and performance-based stock award activity as of June 30, 2016 and September 30, 2015 : June 30, 2016 September 30, 2015 Restricted Shares Common Shares Weighted-Average Common Shares Weighted-Average Restricted shares, beginning of fiscal year 80,446 $ 18.18 — $ — Granted 113,543 30.95 81,419 18.18 Vested and issued (25,729 ) 18.11 — — Forfeited (3,137 ) 20.94 (973 ) 18.00 Canceled — — — — Restricted shares, end of period 165,123 $ 26.92 80,446 $ 18.18 Vested, but not issuable at end of period 24,480 $ 26.14 12,221 $ 18.00 Performance Shares Performance shares, beginning of fiscal year 211,026 $ 18.00 — $ — Granted 43,371 30.78 221,294 18.00 Vested and issued (55 ) 18.00 — — Forfeited (14,440 ) 18.36 (10,268 ) 18.00 Canceled — — — — Performance shares, end of period 239,902 $ 20.29 211,026 $ 18.00 The number of performance shares granted is reflected in the above table at the 100% target performance level. The actual performance-based award payouts will vary based on the achievement of the pre-established targets and can range from 0% to 150% of the target amount. The outstanding number of performance shares reflected in the table represents the number of shares expected to be awarded based on estimated achievement of the goals as of June 30, 2016 . The maximum number of performance-based shares that could be issued if performance is attained at 150% of target based on the grants made to date was approximately 359,853 shares at June 30, 2016 . As of June 30, 2016 , there was $ 4.9 million of unrecognized compensation cost related to nonvested restricted stock awards expected to be recognized over a period of 2.4 years. The fair value of the vested, but not issued stock awards at June 30, 2016 , was $0.8 million .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company measures, monitors and discloses certain of its assets and liabilities on a fair value basis. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value guidance also establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value are as follows: Level 1 Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities Level 1 inputs are considered to be the most transparent and reliable and Level 3 inputs are considered to be the least transparent and reliable. The Company assumes the use of the principal market to conduct a transaction of each particular asset or liability being measured and then considers the assumptions that market participants would use when pricing the asset or liability. Whenever possible, the Company first looks for quoted prices for identical assets or liabilities in active markets (Level 1 inputs) to value each asset or liability. However, when inputs from identical assets or liabilities on active markets are not available, the Company utilizes market observable data for similar assets and liabilities. The Company maximizes the use of observable inputs and limits the use of unobservable inputs to occasions when observable inputs are not available. The need to use unobservable inputs generally results from the lack of market liquidity of the actual financial instrument or of the underlying collateral. Although in some instances, third party price indications may be available, limited trading activity can challenge the observability of these quotations. Assets and Liabilities Measured at Fair Value on a Recurring Basis Following is a description of the valuation methodologies and inputs used for assets and liabilities measured at fair value on a recurring basis and recognized in the accompanying consolidated balance sheets, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. Securities Available for Sale Where quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. Level 1 securities include U.S. Treasury securities and U.S. Agency securities. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows and classified as Level 2 securities. Level 2 securities include agency mortgage-backed, states and political subdivisions, corporate debt, and other securities. Where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy. Interest Rate Swaps and Loans Interest rate swaps are valued by the Company's Swap Dealers using LIBOR rates. The fair value of loans accounted for under the fair value option represents the net carrying value of the loan, plus the equal and opposite amount of the value of the swap needed to hedge the interest rate risk and an adjustment for credit risk based on our assessment of existing market conditions for the specific portfolio of loans. This is used due to the strict prepayment penalties put in the loan terms to cover the cost of exiting the hedge of the loans in the case of early prepayment or termination. The adjustment for credit risk on loans accounted for under the fair value option is not significant to the overall fair value of the loans. The fair values estimated by the Company's Swap Dealers use interest rates that are observable or that can be corroborated by observable market data and, therefore, are classified within Level 2 of the valuation hierarchy. The Company is required to post cash collateral to swap counterparties for interest rate derivative contracts that are in a liability position, thus a credit risk adjustment on interest rate swaps is not warranted. Cash Value of Life Insurance Fair value is equal to the cash surrender value of the life insurance policies. The following table presents the fair value measurements of assets and liabilities recognized in the accompanying consolidated balance sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall at June 30, 2016 and September 30, 2015 (in thousands): Fair Value Level 1 Level 2 Level 3 As of June 30, 2016 U.S. Treasury securities $ 231,997 $ 231,997 $ — $ — U.S. Agency securities 50,007 50,007 — — Mortgage-backed securities 1,039,008 — 1,039,008 — States and political subdivision securities 34,098 — 32,783 1,315 Corporate debt securities 4,999 — 4,999 — Other 1,055 — 1,055 — Securities available for sale $ 1,361,164 $ 282,004 $ 1,077,845 $ 1,315 Derivatives-assets $ 253 $ 253 $ — Derivatives-liabilities 91,319 — 91,319 — Fair value loans and written loan commitments 1,156,442 — 1,156,442 — Cash value of life insurance 28,945 — 28,945 — Fair Value Level 1 Level 2 Level 3 As of September 30, 2015 U.S. Treasury securities $ 254,797 $ 254,797 $ — $ — U.S. Agency securities 75,055 75,055 — — Mortgage-backed securities 989,600 — 989,600 — States and political subdivision securities 1,850 — 15 1,835 Corporate debt securities 4,983 — 4,983 — Other 1,042 — 1,042 — Securities available for sale $ 1,327,327 $ 329,852 $ 995,640 $ 1,835 Derivatives-assets $ 95 $ — $ 95 $ — Derivatives-liabilities 53,613 — 53,613 — Fair value loans and written loan commitments 1,118,687 — 1,118,687 — Cash value of life insurance 6,800 — 6,800 — The following table presents the changes in Level 3 financial instruments for the three and nine months ended June 30, 2016 and 2015 (in thousands): Other Securities Available for Sale Three months ended June 30, Nine months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 1,458 $ 1,958 $ 1,835 $ 2,029 Additions 15 — 15 — Principal paydown (158 ) (124 ) (235 ) (195 ) Realized loss on securities — — (300 ) — Balance, end of period $ 1,315 $ 1,834 $ 1,315 $ 1,834 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Following is a description of the valuation methodologies used for assets and liabilities measured at fair value on a nonrecurring basis and recognized in the accompanying consolidated balance sheets, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. Impaired Loans (Collateral Dependent) Loans for which it is probable that the Company will not collect all principal and interest due according to contractual terms are measured for impairment. Allowable methods for estimating fair value include using the fair value of the collateral for collateral dependent loans or, where a loan is determined not to be collateral dependent, using the discounted cash flow method. If the impaired loan is identified as collateral dependent, then the fair value method of measuring the amount of the impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor, if necessary, to the appraised value and including costs to sell. Because many of these inputs are not observable, the measurements are classified as Level 3. Other Real Estate Owned (OREO) Other real estate owned consists of loan collateral that has been repossessed through foreclosure. This collateral is comprised of commercial and residential real estate. OREO is recorded initially at fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically, and the assets may be marked down further to fair value less selling costs, reflecting a valuation allowance. Fair value measurements may be based upon appraisals, third-party price opinions, or internally developed pricing methods. These measurements are classified as Level 3. Mortgage Loans Held for Sale Fair value of mortgage loans held for sale is based on either quoted prices for the same or similar loans, or values obtained from third parties, or are estimated for portfolios of loans with similar financial characteristics and are therefore considered a Level 2 valuation. Loan Servicing Rights Fair value is determined at a tranche level, based on market prices for comparable mortgage servicing contracts (Level 3), when available, or alternatively based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model utilizes interest rate, prepayment speed, and default rate assumptions that market participants would use in estimating future net servicing income and that can be validated against market data (Level 3). The following tables present the fair value measurement of assets and liabilities measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at June 30, 2016 and September 30, 2015 (in thousands): Fair Value Level 1 Level 2 Level 3 As of June 30, 2016 Other real estate owned $ 3,985 $ — $ — $ 3,985 Impaired loans 160,151 — — 160,151 Loans held for sale, at lower of cost or fair value 21,301 — 21,301 — Loan servicing rights 6,231 — — 6,231 As of September 30, 2015 Other real estate owned $ 8,826 $ — $ — $ 8,826 Impaired loans 153,318 — — 153,318 Loans held for sale, at lower of cost or fair value 9,867 — 9,867 — Loan servicing rights — — — — The valuation techniques and significant unobservable inputs used to measure Level 3 fair value measurements at June 30, 2016 were as follows (in thousands): Financial Fair Value of Assets / (Liabilities) at June 30, 2016 Valuation Unobservable Range Weighted Other real estate owned $ 3,985 Appraisal value Property specific adjustment N/A N/A Impaired loans 160,151 Appraisal value Property specific adjustment N/A N/A Loan servicing rights 6,231 Discounted cash flows Constant prepayment rate 13.0 - 22.0% 16.4% Disclosures about Fair Value of Financial Instruments For financial instruments that have quoted market prices, those quotes are used to determine fair value. Financial instruments that have no defined maturity, have a remaining maturity of 180 days or less, or reprice frequently to a market rate are assumed to have a fair value that approximates carrying value, after taking into consideration any applicable credit risk. If no market quotes are available, financial instruments are valued by discounting the expected cash flows using an estimated current market interest rate for the financial instrument. The short maturity of the Company’s assets and liabilities results in having a significant number of financial instruments whose fair value equals or closely approximates carrying value. Such financial instruments are reported in the following consolidated balance sheet categories: cash and due from banks, securities sold under agreements to repurchase, and accrued interest. Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial instruments include premises and equipment, deferred income taxes, goodwill, and core deposit and other intangibles. In addition, the tax ramifications related to the realization of unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates. Off-balance sheet instruments (commitments to extend credit and standby letters of credit) are generally short-term and at variable rates. Therefore, both the carrying amount and the estimated fair value associated with these instruments are immaterial. Fair values for balance sheet instruments as of June 30, 2016 and September 30, 2015 , are as follows (in thousands): June 30, 2016 September 30, 2015 Level in Carrying Fair Value Carrying Fair Value Assets Cash and due from banks Level 1 $ 475,785 $ 475,785 $ 237,770 $ 237,770 Loans, net excluding fair valued loans and loans Level 3 7,364,988 7,337,738 6,139,444 6,120,262 Accrued interest receivable Level 2 43,547 43,547 44,077 44,077 Federal Home Loan Bank stock Level 2 48,799 48,799 35,745 35,745 Liabilities Deposits Level 2 $ 8,480,209 $ 8,479,066 $ 7,387,065 $ 7,385,894 FHLB advances and other borrowings Level 2 913,377 917,617 581,000 584,261 Securities sold under repurchase agreements Level 2 159,016 159,016 185,271 185,271 Accrued interest payable Level 2 5,387 5,387 4,006 4,006 Subordinated debentures and subordinated notes payable Level 2 111,827 113,083 90,727 91,305 The following methods and assumptions were used in estimating the fair value of financial instruments that were not previously disclosed: Cash and cash due from banks: Due to the short term nature of cash and cash equivalents, the estimated fair value is equal to the carrying value and they are categorized as a Level 1 fair value measurement. Loans, net excluding fair valued loans and loans held for sale: The fair value of the loan portfolio is estimated using observable inputs including estimated cash flows, and discount rates based on interest rates currently being offered for loans with similar terms, to borrowers of similar credit quality. Loans held for investment are categorized as a Level 3 fair value measurement. Accrued interest receivable: Due to the nature of accrued interest receivable, the estimated fair value is equal to the carrying value and they are categorized as a Level 2 fair value measurement. Federal Home Loan Bank stock: The carrying amount of FHLB stock approximates its fair value as it can only be redeemed with the FHLB at par value. Federal Home Loan Bank stock has been categorized as a Level 2 fair value measurement. Deposits: The estimated fair value of deposits with no stated maturity, such as non-interest bearing demand deposits, savings, NOW, and money market accounts, is equal to the amount payable on demand. The fair value of interest-bearing time deposits is based on the discounted value of contractual cash flows of such deposits, taking into account the option for early withdrawal. The discount rate is estimated using the rates offered by the Company, at the respective measurement dates, for deposits of similar maturities. Deposits have been categorized as a Level 2 fair value measurement. FHLB advances and other borrowings: The fair value of FHLB advances and other borrowings is estimated using discounted cash flow analysis, based on current incremental borrowing rates for similar types of borrowing arrangements. In the absence of a reasonably precise methodology to determine the fair value of the credit agreement, carrying value has been used to represent fair value. FHLB advances and other borrowings have been categorized as a Level 2 fair value measurement. Securities sold under repurchase agreements: The Company’s repurchase agreements are overnight transactions that mature the day after the transaction, and as a result of this short-term nature, the estimated fair value equals the carrying value. Securities sold under repurchase agreements have been categorized as a Level 2 fair value measurement. Accrued interest payable: Due to the nature of accrued interest payable, the estimated fair value is equal to the carrying value and they are categorized as a Level 2 fair value measurement. Subordinated Debentures and Subordinated Notes Payable: The fair value of subordinated debentures and subordinated notes payable is estimated using discounted cash flow analysis, based on current incremental debt rates. Subordinated debentures and subordinated notes payable have been categorized as a Level 2 fair value measurement.

Earnings per Share

Earnings per Share	9 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period, excluding outstanding non-vested restricted stock awards. Diluted earnings per common share is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding determined for the basic earnings per share calculation plus the dilutive effect of stock compensation using the treasury stock method. The following information was used in the computation of basic earnings per share (EPS) for the three and nine months ended June 30, 2016 and 2015 (in thousands, except share data): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Net income $ 26,360 $ 28,832 $ 87,495 $ 75,253 Weighted average common shares outstanding 57,012,698 57,898,335 55,845,322 57,897,484 Dilutive effect of stock based compensation 164,007 60,867 147,689 31,704 Weighted average common shares outstanding for diluted earnings per share calculation 57,176,705 57,959,202 55,993,011 57,929,188 Basic earnings per share $ 0.46 $ 0.50 $ 1.57 $ 1.30 Diluted earnings per share $ 0.46 $ 0.50 $ 1.56 $ 1.30 The Company had 36,696 and 30,909 shares of unvested performance stock as of June 30, 2016 and 2015 , respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met. The Company had 88,775 and 60,543 shares of anti-dilutive stock awards outstanding as of June 30, 2016 and 2015 , respectively.

Nature of Operations and Summ29

Nature of Operations and Summary of Significant Policies (Policies)	9 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited consolidated interim financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and reflect all adjustments that are, in the opinion of management, necessary for the fair presentation of the financial position and results of operations for the periods presented. All such adjustments are of a normal recurring nature. Certain previously reported amounts have been reclassified to conform to the current presentation.
Principles of Consolidation	The accompanying unaudited consolidated financial statements include the accounts and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. The preparation of unaudited consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates.
Business Combinations	The Company accounts for business combinations under the acquisition method of accounting in accordance with ASC 805, “Business Combinations” (“ASC 805”). The Company recognizes the fair value of the assets acquired and liabilities assumed, immediately expenses transaction costs and accounts for restructuring plans separately from the business combination. There is no separate recognition of the acquired allowance for loan and lease losses on the acquirer’s balance sheet as credit related factors are incorporated directly into the fair value of the loans recorded at the acquisition date. The excess of the cost of the acquisition over the fair value of the net tangible and intangible assets acquired is recorded as goodwill. Alternatively, a bargain purchase gain is recorded equal to the amount by which the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. Results of operations of the acquired business are included in the consolidated statements of comprehensive income from the effective date of acquisition.
Securities	The Company classifies securities upon purchase in one of three categories: trading, held to maturity, or available for sale. Debt and equity securities held for resale are classified as trading. Debt securities for which the Company has the ability and positive intent to hold until maturity are classified as held to maturity. All other securities are classified as available for sale as they may be sold prior to maturity in response to changes in the Company’s interest rate risk profile, funding needs, demand for collateralized deposits by public entities or other reasons. Held to maturity securities are stated at amortized cost, which represents actual cost adjusted for premium amortization and discount accretion. Available for sale securities are stated at fair value, with unrealized gains and losses, net of related taxes, included in stockholders’ equity as a component of accumulated other comprehensive income (loss). Trading securities are stated at fair value. Realized and unrealized gains and losses from sales and fair value adjustments of trading securities are included in other noninterest income in the consolidated statements of comprehensive income. Purchases and sales of securities are recognized on a trade date basis. The cost of securities sold is based on the specific identification method. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are recognized in earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, management considers the length of time and extent to which the fair value has been less than amortized cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment loss is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that it will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in accumulated other comprehensive income (loss). Interest and dividends, including amortization of premiums and accretion of discounts, are recognized as interest or dividend income when earned. Realized gains and losses on sales (using the specific identification method) and declines in value judged to be other- than-temporary are included in noninterest income in the consolidated statements of comprehensive income.
Loans	The Company’s accounting method for loans differs depending on whether the loans were originated or purchased and, for purchased loans, whether the loans were acquired at a discount related to evidence of credit deterioration since date of origination. Originated Loans Loans that management has the intent and ability to hold for the foreseeable future, or until maturity or pay-off, generally are reported at their outstanding principal balance, adjusted for charge-offs, the allowance for loan and lease losses, and any unamortized deferred fees or costs. Other fees, not associated with originating a loan are recognized as fee income when earned. Interest income on loans is accrued daily on the outstanding balances. Accrual of interest is discontinued when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that collection of interest is doubtful, which is generally at 90 days past due. Generally, when loans are placed on nonaccrual status, interest receivable is reversed against interest income in the current period. Interest payments received thereafter are applied as a reduction to the remaining principal balance as long as concern exists as to the ultimate collection of the principal. Loans are removed from nonaccrual status when they become current as to both principal and interest and concern no longer exists as to the collectability of principal and interest. The Company has elected to measure certain long-term loans and written loan commitments at fair value to assist in managing interest rate risk for longer-term loans. Fair value loans are fixed-rate loans having original maturities of 5 years or greater (typically between 5 and 15 years ) to our business and agribusiness banking customers to assist them in facilitating their risk management strategies. The fair value option was elected upon the origination or acquisition of these loans and written loan commitments. Interest income is recognized in the same manner on loans reported at fair value as on non-fair value loans, except in regard to origination fees and costs which are recognized immediately upon closing. The changes in fair value of long-term loans and written loan commitments at fair value are reported in noninterest income. For loans held for sale, loan fees charged or received on origination, net of certain direct loan origination costs, are recognized in income when the related loan is sold. For loans held for investment, loan fees, net of certain direct loan origination costs, are deferred, and the net amount is amortized as an adjustment of the related loan’s yield. The Company is generally amortizing these amounts over the contractual lives of the loans. Commitment fees are recognized as income when received. The Company grants commercial, agricultural, consumer, residential real estate, and other loans to customers primarily in Arizona, Colorado, Iowa, Kansas, Missouri, Minnesota, Nebraska, North Dakota and South Dakota. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower. Collateral held varies but includes accounts receivable, inventory, property and equipment, residential real estate, and income-producing commercial and agricultural properties. Government guarantees are also obtained for some loans, which reduces the Company’s risk of loss. Loans originated and intended for sale in the secondary market are carried at the lower of cost or fair value. Loans held for sale include fixed rate single-family residential mortgage loans under contract to be sold in the secondary market. In most cases, loans are carried at cost and sold within 45 days . These loans are sold with the mortgage servicing rights released. Under limited circumstances, buyers may have recourse to return a purchased loan to the Company. Recourse conditions may include early payment default, breach of representation or warranties, or documentation deficiencies. Fair value of loans held for sale is determined based on prevailing market prices for loans with similar characteristics, sale contract prices, or, for certain portfolios, discounted cash flow analysis. Declines in fair value below cost (and subsequent recoveries) are recognized in net gain on sale of loans. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Gains or losses on sales are recognized upon delivery and included in net gain on sale of loans. Purchased Loans Loans acquired (non-impaired and impaired) in a business acquisition are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan and lease losses is not recorded at the acquisition date. In determining the acquisition date fair value of purchased loans with evidence of credit deterioration (“ASC 310-30 loans”), and in subsequent accounting, the Company generally aggregates impaired purchased consumer and certain smaller balance impaired commercial loans into pools of loans with common risk characteristics, while accounting for larger-balance impaired commercial loans individually. Expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level-yield method. Management estimates the cash flows expected to be collected at acquisition and at subsequent measurement dates using internal risk models, which incorporate the estimate of key assumptions, such as default rates, loss severity, and prepayment speeds. Subsequent to the acquisition date, decreases in cash flows over those expected at the acquisition date are recognized by recording an allowance for loan and lease losses. Subsequent increases in cash flow over those expected at the acquisition date are recognized as reductions to allowance for loan and lease losses to the extent impairment was previously recognized and thereafter as interest income prospectively. For purchased loans not deemed impaired at the acquisition date, the difference between the fair value and the unpaid principal balance of the loan at acquisition date is amortized or accreted to interest income using the effective interest method over the remaining period to contractual maturity. Credit Risk Management The Company’s strategy for credit risk management includes well-defined, centralized credit policies, uniform underwriting criteria and ongoing risk monitoring and review processes for all credit exposures. The strategy also emphasizes diversification on a geographic, industry, and customer level; regular credit examinations; and management reviews of loans exhibiting deterioration of credit quality. The credit risk management strategy also includes a credit risk assessment process that performs assessments of compliance with commercial and consumer credit policies, risk ratings, and other critical credit information. Loan decisions are documented with respect to the borrower’s business, purpose of the loan, evaluation of the repayment sources, and the associated risks, evaluation of collateral, covenants and monitoring requirements, and risk rating rationale. The Company categorizes its loan portfolio into six classes, which is the level at which it develops and documents a systematic methodology to determine the allowance for loan and lease losses. The Company’s six loan portfolio classes are residential real estate, commercial real estate, commercial non real estate, agriculture, consumer and other lending. The residential real estate lending class includes loans made to consumer customers including residential mortgages, residential construction loans and home equity loans and lines. These loans are typically fixed rate loans secured by residential real estate. Home equity lines are revolving accounts giving the borrower the ability to draw and repay balances repeatedly, up to a maximum commitment, and are secured by residential real estate. Home equity lines typically have variable rate terms which are benchmarked to a prime rate. Historical loss history is the primary factor in determining the allowance for loan and lease losses for the residential real estate lending class. Key risk characteristics relevant to residential real estate lending class loans primarily relate to the borrower’s capacity and willingness to repay and include unemployment rates and other economic factors, and customer payment history. These risk characteristics, among others, are reflected in the environmental factors considered in determining the allowance for loan and lease losses. The commercial real estate lending class includes loans made to small and middle market businesses, including multifamily properties. Loans in this class are secured by commercial real estate. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the commercial real estate lending class. Key risk characteristics relevant to the commercial real estate lending class include the industry and geography of the borrower’s business, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The commercial non real estate lending class includes loans made to small and middle market businesses, and loans made to public sector customers. Loans in this class are generally secured by business assets and guaranteed by owners; cashflows are most often our primary source of repayment. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the commercial non real estate lending class. Key risk characteristics relevant to the commercial non real estate lending class include the industry and geography of the borrower’s business, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The agriculture lending class includes loans made to small and mid-size agricultural businesses and individuals. Loans in this class are generally secured by operating assets and guaranteed by owners; cashflows are most often our primary source of repayment. Historical loss history and updated loan-to-value information on collateral-dependent loans are the primary factors in determining the allowance for loan and lease losses for the agriculture lending class. Key risk characteristics relevant to the agriculture lending class include the geography of the borrower’s operations, commodity prices and weather patterns, purpose of the loan, repayment sources, borrower’s debt capacity and financial performance, loan covenants, and nature of pledged collateral. We consider these risk characteristics in assigning risk ratings and estimating environmental factors considered in determining the allowance for loan and lease losses. The consumer lending class includes loans made to consumer customers including loans secured by automobiles and other installment loans, and the other lending class includes credit card loans and unsecured revolving credit lines. Historical loss history is the primary factor in determining the allowance for loan and lease losses for the consumer and other lending classes. Key risk characteristics relevant to loans in the consumer and other lending classes primarily relate to the borrower’s capacity and willingness to repay and include unemployment rates and other economic factors, and customer payment and overall credit history. These risk characteristics, among others, are reflected in the environmental factors considered in determining the allowance for loan and lease losses. The Company assigns all non-consumer loans a credit quality risk rating. These ratings are Pass, Watch, Substandard, Doubtful, and Loss. Loans with a Pass and Watch rating represent those loans not classified on the Company’s rating scale for problem credits, with loans with a Watch rating being monitored and updated at least quarterly by management. Substandard loans are those where a well-defined weakness has been identified that may put full collection of contractual debt at risk. Doubtful loans are those where a well-defined weakness has been identified and a loss of contractual debt is probable. Substandard and doubtful loans are monitored and updated monthly. All loan risk ratings are updated and monitored on a continuous basis. The Company generally does not risk rate consumer loans unless a default event such as bankruptcy or extended nonperformance takes place. Alternatively, standard credit scoring systems are used to assess credit risks of consumer loans. Troubled Debt Restructurings (“TDRs”) Loans modified under troubled debt restructurings involve granting a concession to a borrower who is experiencing financial difficulty. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance, or other actions intended to maximize collection, which generally would not otherwise be considered. Our TDRs include performing and nonperforming TDRs, which consist of loans that continue to accrue interest at the loan's original interest rate as we expect to collect the remaining principal and interest on the loan, and nonaccrual TDRs, which include loans that are in a nonaccrual status and are no longer accruing interest, as we do not expect to collect the full amount of principal and interest owned from the borrower on these loans. At the time of modification (except for loans on nonaccrual status), a TDR is classified as nonperforming TDR until a six -month payment history of principal and interest payments, in accordance with the terms of the loan modification, is sustained, at which time we move the loan to a performing status (performing TDR). If we do not expect to collect all principal and interest on the loan, the modified loan is classified as a nonaccrual TDR. All TDRs are accounted for as impaired loans and are included in our analysis of the allowance for loan and lease losses. A TDR that has been re-underwritten and renewed for a borrower who is no longer experiencing financial difficulty and which yields a market rate of interest at the time of a renewal is no longer considered a TDR. Allowance for Loan and Lease Losses (“ALLL”) and Unfunded Commitments The Company maintains an allowance for loan and lease losses at a level management believes is appropriate to reserve for credit losses inherent in our loan portfolio. The allowance for loan and lease losses is determined based on an ongoing evaluation, driven primarily by monitoring changes in loan risk grades, delinquencies, and other credit risk indicators, which is inherently subjective. The Company considers the uncertainty related to certain industry sectors and the extent of credit exposure to specific borrowers within the portfolio. In addition, consideration is given to concentration risks associated with the various loan portfolios and current economic conditions that might impact the portfolio. The Company also considers changes, if any, in underwriting activities, the loan portfolio composition (including product mix and geographic, industry, or customer-specific concentrations), trends in loan performance, the level of allowance coverage relative to similar banking institutions and macroeconomic factors, such as changes in unemployment rates, gross domestic product, and consumer bankruptcy filings. All of these estimates are susceptible to significant change. Changes to the allowance for loan and lease losses are made by charges to the provision for loan and lease losses, which is reflected in the consolidated statements of comprehensive income. Past due status is monitored as an indicator of credit deterioration. Loans that are 90 days or more past due are put on nonaccrual status unless the loan is well secured and in the process of collection. Loans deemed to be uncollectible are charged off against the allowance for loan and lease losses. Recoveries of amounts previously charged-off are credited to the allowance for loan and lease losses. The allowance for loan and lease losses consist of reserves for probable losses that have been identified related to specific borrowing relationships that are individually evaluated for impairment (“specific reserve”), as well as probable losses inherent in our loan portfolio that are not specifically identified (“collective reserve”). The specific reserve relates to impaired loans. A loan is impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due (interest as well as principal) according to the contractual terms of the loan agreement. Specific reserves are determined on a loan-by-loan basis based on management’s best estimate of the Company’s exposure, given the current payment status of the loan, the present value of expected payments, and the value of any underlying collateral. Impaired loans also include loans modified in troubled debt restructurings. Generally, the impairment related to troubled debt restructurings is measured based on the fair value of the collateral, less cost to sell, or the present value of expected payments relative to the unpaid principal balance. If the impaired loan is identified as collateral dependent, then the fair value of the collateral method of measuring the amount of the impairment is utilized. This method requires obtaining an independent appraisal of the collateral and applying a discount factor to the appraised value, if necessary, and including costs to sell. Management’s estimate for collective reserves reflects losses incurred in the loan portfolio as of the consolidated balance sheet reporting date. Incurred loss estimates primarily are based on historical loss experience and portfolio mix. Incurred loss estimates may be adjusted for qualitative factors such as current economic conditions and current portfolio trends including credit quality, concentrations, aging of the portfolio, and/or significant policy and underwriting changes. The Company maintains an ALLL for acquired impaired loans accounted for under ASC 310-30, resulting from decreases in expected cash flows arising from the periodic revaluation of these loans. Any decrease in expected cash flows in the individual loan pool is generally recognized in the current provision for loan and lease losses. Any increase in expected cash flows is generally not recognized immediately, but is instead reflected as an adjustment to the related loan or pool's yield on a prospective basis once any previously recorded provision for loan and lease loss has been recognized. For acquired nonimpaired loans accounted for under ASC 310-20, the Company utilizes methods to estimate the required allowance for loan and lease losses similar to originated loans; the required reserve is compared to the net carrying value of each acquired nonimpaired loan (by segment) to determine if a provision is required. While management uses the best information available to establish the allowance for loan and lease losses, future adjustments may be necessary if economic conditions differ substantially from the assumptions used in performing the estimates. Unfunded residential mortgage loan commitments entered into in connection with mortgage loans to be held for sale are considered derivatives and are recorded at fair value and included in other liabilities on the consolidated balance sheets with changes in fair value recorded in other interest income. All other unfunded loan commitments are generally related to providing credit facilities to customers and are not considered derivatives. For purchased loans, the fair value of the unfunded credit commitments is considered in determination of the fair value of the loans recorded at the date of acquisition. Reserves for credit exposure on all other unfunded credit commitments are recorded in other liabilities on the consolidated balance sheets.
FDIC Indemnification Asset and Clawback Liability	In conjunction with a Federal Deposit Insurance Corporation (“FDIC”)-assisted transaction of TierOne Bank in 2010, the Company entered into two loss share agreements with the FDIC, one covering certain single family residential mortgage loans with the claim period ending June 2020 and one covering commercial loans and other assets, in which the claim period ended in June 2015. The agreements cover a portion of realized losses on loans, foreclosed real estate and certain other assets. The Company has recorded assets on the consolidated balance sheets (i.e. indemnification assets) representing estimated future amounts recoverable from the FDIC. Fair values of loans covered by the loss sharing agreements at the acquisition date were estimated based on projected cash flows available based on the expected probability of default, default timing and loss given default, the expected reimbursement rates (generally 80% ) from the FDIC and other relevant terms of the loss sharing agreements. The initial fair value was established by discounting these expected cash flows with a market discount rate for instruments with like maturity and risk characteristics. The loss share assets are measured separately from the related loans and foreclosed real estate and recorded as an FDIC indemnification asset on the consolidated balance sheets because they are not contractually embedded in the loans and are not transferable with the loans should the Company choose to dispose of them. Subsequent to the acquisition date, reimbursements received from the FDIC for actual incurred losses reduce the carrying amount of the loss share assets. Reductions to expected losses on covered assets, to the extent such reductions to expected losses are the result of an improvement to the actual or expected cash flows from the covered assets, also reduce the carrying amount of the loss share assets. The rate of accretion of the indemnification asset discount included in interest income slows to mirror the accelerated accretion of the loan discount. Additional expected losses on covered assets, to the extent such expected losses result in the recognition of an allowance for loan and lease losses, increase the carrying amount of the loss share assets. A related increase in the value of the indemnification asset up to the amount covered by the FDIC is calculated based on the reimbursement rates from the FDIC and is included in other noninterest income. The corresponding loan accretion or amortization is recorded as a component of interest income on the consolidated statements of comprehensive income. Although these assets are contractual receivables from the FDIC, there are no contractual interest rates. As part of the loss sharing agreements, the Company also assumed a liability (“FDIC Clawback Liability”) to be paid within 45 days subsequent to the maturity or termination of the loss sharing agreements that is contingent upon actual losses incurred over the life of the agreements relative to expected losses considered in the consideration paid at acquisition date and the amount of losses reimbursed to the Company under the loss sharing agreements. The liability was recorded at fair value as of the acquisition date. The fair value was based on a discounted cash flow calculation that considered the formula defined in the loss sharing agreements and projected losses. The difference between the fair value at acquisition date and the projected losses is amortized through other noninterest expense. As projected losses and reimbursements are updated, as described above, the FDIC Clawback Liability is adjusted and a gain or loss is recorded in other noninterest expense.
Loan Servicing Rights	The Company records a servicing asset for contractually separated servicing from the underlying mortgage loans. Fair value is based on market prices for comparable mortgage servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The asset is amortized into mortgage banking income, net on the consolidated statement of comprehensive income in proportion to and over the period of estimated net servicing income. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to the carrying amount. Impairment is determined by stratifying rights into groupings based on characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the allowance may be recorded as an increase to noninterest income. If the Company determines the impairment to be permanent, the valuation is written off against the loan servicing rights, which results in a new amortized balance. Changes in the valuation allowance are reported in mortgage banking income, net in the consolidated statement of comprehensive income. The fair value of loan servicing rights is subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Estimating future cash flows on the underlying mortgages is a difficult analysis and requires judgment based on the best information available. Based on the Company's analysis of loan servicing rights, a valuation allowance of $0.2 million was recorded at June 30, 2016 . Servicing fee income, which is reported in noninterest income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding balance or a fixed amount per loan and are recorded as income as earned. The amortization of loan servicing rights is netted against mortgage banking income, net in the statement of consolidated comprehensive income.
Goodwill	Goodwill represents the cost in excess of the fair value of net assets acquired (including identifiable intangibles) in transactions accounted for as business acquisitions. Goodwill is evaluated annually for impairment or more frequently if events and circumstances exist that indicates that a goodwill impairment test should be performed. The Company performs its impairment evaluation as of June 30 of each fiscal year. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated and goodwill is written down to its implied fair value. Subsequent increases in goodwill are not recognized in the consolidated financial statements.
Core Deposits and Other Intangibles	Intangible assets consist of core deposits, brand intangible, customer relationships, and other intangibles. Core deposits represent the identifiable intangible value assigned to core deposit bases arising from purchase acquisitions. Brand intangible represents the value associated with the Bank charter. Customer relationships intangible represents the identifiable intangible value assigned to customer relationships arising from a purchase acquisition. Other intangibles represent contractual franchise arrangements under which the franchiser grants the franchisee the right to perform certain functions within a designated geographical area. The methods and lives used to amortize intangible assets are as follows: Intangible Method Years Core deposit Straight-line or effective yield 5 - 10 Brand intangible Straight-line 15 Customer relationships Straight-line 8.5 Other intangibles Straight-line 1.25 - 9.33 Intangible assets are evaluated for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable.
Derivatives	The Company maintains an overall interest rate risk management strategy that permits the use of derivative instruments to modify exposure to interest rate risk. The Company enters into interest rate swap contracts to offset the interest rate risk associated with borrowers who lock in long-term fixed rates (greater than or equal to 5 years to maturity) through a fixed rate loan. These contracts do not qualify for hedge accounting. Generally, under these swaps, the Company agrees with various swap counterparties to exchange the difference between fixed-rate and floating-rate interest amounts based upon notional principal amounts. These interest rate derivative instruments are recognized as assets and liabilities on the consolidated balance sheets and measured at fair value, with changes in fair value reported in net realized and unrealized gain (loss) on derivatives. Since each fixed rate loan is paired with an offsetting derivative contract, the impact to net income is minimized. The Company enters into forward interest rate lock commitments on mortgage loans to be held for sale, which are commitments to originate loans whereby the interest rate on the loan is determined prior to funding. The Company also has corresponding forward sales contracts related to these interest rate lock commitments. Both the mortgage loan commitments and the related sales contracts are considered derivatives and are recorded at fair value with changes in fair value recorded in noninterest income.
Stock Based Compensation	Restricted and performance-based stock units/awards are classified as equity awards and accounted for under the Treasury method. Compensation expense for non-vested stock units/awards is based on the fair value of the award on the measurement date, which, for the Company, is the date of the grant and is recognized ratably over the vesting or performance period of the award. The fair value of non-vested stock units/awards is generally the market price of the Company's stock on the date of grant.
Income Taxes	The Company was required to file a consolidated income tax return with National Americas Investment, Inc. ("NAI") (a wholly owned indirect subsidiary of NAB) until NAI's dissolution on October 17, 2014. Income taxes are allocated pursuant to a tax-sharing arrangement, whereby the Company will pay federal and state income taxes as if it were filing on a stand-alone basis. Income tax expense includes two components: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over income. The Company determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax basis of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized. Tax benefits related to uncertain tax positions are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term "more likely than not" means a likelihood of more than 50 percent; the terms "examined" and "upon examination" also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management’s judgment.
Transfers of Financial Assets	Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company-put presumptively beyond reach of the Company and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Securities sold under agreements to repurchase are accounted for as collateralized financing transactions and are recorded at amounts at which the securities were financed, plus accrued interest.
Defined Benefit Plan	The Company assumed plan sponsorship of the HF Financial Corp. Pension Plan during the quarter as part of the HF Financial acquisition. Defined benefit pension obligation and related costs are calculated using actuarial concepts and measurements. Three critical assumptions, the discount rate, the expected long-term rate of return on plan assets, and mortality rates are important elements of expense and/or benefit obligation measurements. Other assumptions involve employee demographic factors such as retirement patterns and turnover. The Company evaluates all assumptions annually. For accounting purposes, mortality assumptions at June 30, 2016 were based on the RP-2014 mortality tables and the MP 2015 projection scales. The discount rate enables the Company to state expected future benefit payments as a present value on the measurement date. The Company determined the discount rate at June 30, 2016 by utilizing the standard duration index from the Citi Pension Discount Curve and Liability Index. A lower discount rate increases the present value of benefit obligations and increases pension expense. To determine expected long-term rate of return on defined benefit pension plan assets, the Company considers the current asset allocation of the defined benefit pension plan, as well as historical and expected returns on each asset class. A lower expected rate of return on defined pension plan assets will increase pension expense. The Company recognizes the over- or under-funded status of a plan as an other asset or other liability in the consolidated balance sheet as measured by the difference between the fair value of the plan assets and the projected benefit obligation. When recorded, unrecognized prior service costs and actuarial gains and losses are recognized as a component of accumulated other comprehensive income (loss).
Revenue Recognition	The Company recognizes revenue as it is earned based on contractual terms, as transactions occur, or as services are provided and collectability is reasonably assured. Certain specific policies related to service charges and other fees include the following: Deposit Service Charges Service charges on deposit accounts are primarily fees related to customer overdraft events and not sufficient funds fees, net of any refunded fees, and are recognized as transactions occur and services are provided. Service charges on deposit accounts also relate to monthly fees based on minimum balances, and are earned as transactions occur and services are provided. Interchange Fees Interchange fees include interchange income from consumer debit card transactions processed through card association networks. Interchange income is a fee paid by a merchant bank to the card-issuing bank through the interchange network. Interchange fees are set by the card association networks and are based on cardholder purchase volumes. Wealth Management Fees Wealth management fees include commission income from financial planning, investment management and insurance operations.
Comprehensive Income	Comprehensive income consists of net income and other comprehensive income, net of applicable income taxes. Other comprehensive income (loss) consists entirely of unrealized appreciation (depreciation) on available-for-sale securities.
Subsequent Events	The Company has evaluated all events or transactions that occurred through the date the Company issued these financial statements. During this period, the Company did not have any material recognizable or non-recognizable subsequent events other than outlined below.
New Accounting Pronouncements	In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which addresses timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The ASU requires institutions to measure all expected credit losses related to financial assets measured at amortized costs with an expected loss model based on historical experience, current conditions and reasonable and supportable forecasts relevant to affect the collectibility of the financial assets, which is referred to as the current expected credit loss (CECL) model. The ASU requires enhanced disclosures, including qualitative and quantitative requirements, to help understand significant estimates and judgments used in estimating credit losses, as well as provide additional information about the amounts recorded in the financial statements. ASU 2016-13 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted after December 15, 2018. The amendment requires the use of the modified retrospective approach for adoption. The Company is currently evaluating the potential impact of ASU 2016-13 on our financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Based Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , which addresses several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Earlier application is permitted. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The Company is currently evaluating the potential impact of ASU 2016-09 on our financial statements. In February 2016, the FASB issued ASU No. 2016-02 , Leases (Topic 842) , which requires that lessees recognize the assets and liabilities arising from leases on the balance sheet. ASU 2015-16 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the potential impact of ASU 2016-02 on our financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The Company is currently evaluating the potential impact of ASU 2016-01 on our financial statements. In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805) - Simplifying the Accounting for Measurement-Period Adjustments, which requires that adjustments to provisional amounts that are identified during the measurement period of a business combination be recognized in the reporting period in which the adjustment amounts are determined. Furthermore, the income statement effects of such adjustments, if any, must be calculated as if the accounting had been completed at the acquisition date. The portion of the amount recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. Under previous guidance, adjustments to provisional amounts identified during the measurement period are to be recognized retrospectively. ASU 2015-16 will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Earlier application is permitted for financial statements that have not been issued, therefore the Company has elected to early adopt this ASU as of and for its quarter ended June 30, 2016 . The adoption of ASU 2015-16 in the third quarter of 2016 did not have a material impact on the Company's consolidated balance sheet or consolidated statement of comprehensive income. See also Note 3 to these consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) , which implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised 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 and services. In August 2015, the FASB issued ASU No. 2015-14 which deferred the effective date of ASU No. 2014-09 to annual reporting periods beginning after December 15, 2017. In March 2016, the FASB issued ASU No. 2016-08, which intends to improve the operability and understandability of the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued ASU No. 2016-10, which clarifies guidance pertaining to the identification of performance obligations and the licensing implementation. In May 2016, the FASB issued ASU Nos. 2016-11 and 2016-12, which further clarify guidance and provide practical expedients related to the adoption of ASU No. 2014-09. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the potential impact of these standards on our financial statements.

Nature of Operations and Summ30

Nature of Operations and Summary of Significant Policies (Tables)	9 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Schedule of Finite-lived Intangible Assets	The methods and lives used to amortize intangible assets are as follows: Intangible Method Years Core deposit Straight-line or effective yield 5 - 10 Brand intangible Straight-line 15 Customer relationships Straight-line 8.5 Other intangibles Straight-line 1.25 - 9.33 A summary of intangible assets subject to amortization is as follows (in thousands): Core Deposit Brand Customer Other Intangible Total As of June 30, 2016 Gross carrying amount $ 100,018 $ 8,464 $ 16,089 $ 538 $ 125,109 Accumulated amortization (92,455 ) (4,559 ) (15,326 ) (12 ) (112,352 ) Net intangible assets $ 7,563 $ 3,905 $ 763 $ 526 $ 12,757 As of September 30, 2015 Gross carrying amount $ 92,679 $ 8,464 $ 16,089 $ — $ 117,232 Accumulated amortization (92,073 ) (4,136 ) (13,904 ) — (110,113 ) Net intangible assets $ 606 $ 4,328 $ 2,185 $ — $ 7,119

Acquisition Activity (Tables)

Acquisition Activity (Tables)	9 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Schedule of acquisition activity	The following table presents the acquired loan data for the HF Financial acquisition. Fair Value of Acquired Loans at Acquisition Date Gross Contractual Amounts Receivable at Acquisition Date Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected (In thousands) Acquired receivables subject to ASC 310-30 $ 51,532 $ 83,710 $ 28,516 Acquired receivables not subject to ASC 310-30 812,209 998,255 9,572 The following summarizes consideration paid and an allocation of purchase price to net assets acquired. Number of Shares Amount (In thousands) Equity consideration: Common stock issued 3,448,119 $ 107,478 Non-equity consideration: Cash 34,487 Total consideration paid 141,965 Fair value of net assets acquired including identifiable intangible assets 101,312 Goodwill $ 40,653
Schedule of assets acquired and liabilities assumed	The following table summarizes the assets acquired and liabilities assumed which were recorded on the consolidated balance sheet as of the date of merger of HF Financial: (In thousands) Fair Value Identifiable assets acquired: Cash and due from banks $ 18,818 Investment securities 165,052 Net loans 863,741 Premises and equipment 19,220 Accrued interest receivable 4,117 Other repossessed property 4 Intangible assets 7,877 Loan servicing rights 6,573 Other assets 36,639 Total identifiable assets acquired $ 1,122,041 Liabilities assumed: Deposits $ 863,121 FHLB advances and other borrowings 115,881 Subordinated debentures 21,110 Other liabilities 20,617 Total liabilities assumed 1,020,729 Fair value of net identifiable assets acquired 101,312 Net purchase price 141,965 Goodwill $ 40,653
Schedule of pro forma information	The following unaudited pro forma combined results of operations of the Company and HF Financial presents results as if the acquisition had been completed as of the beginning of each period indicated. The unaudited pro forma combined results of operations are presented solely for information purposes and are not intended to represent or be indicative of the consolidated results of operations that the Company would have reported had this transaction been completed as of the dates and for the periods presented, nor are they necessarily indicative of future results. In particular, no adjustments have been made to eliminate the amount of HF Financial's provision for loan and lease losses incurred prior to the acquisition date that would not have been necessary had the acquired loans been recorded at fair value as of the beginning of each period indicated. In accordance with Article 11 of SEC Regulation S-X, transaction costs directly attributable to the acquisition have been excluded. Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 (In thousands, except per share data) Net interest income $ 125,539 $ 93,999 $ 316,922 $ 275,746 Net income 35,245 30,795 99,927 77,067 Basic earnings per share 0.62 0.53 1.79 1.33 Fully diluted earnings per share 0.62 0.53 1.78 1.33
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The table below summarizes the total contractually required principal and interest cash payments, management's estimate of expected total cash payments and fair value of the loans as of acquisition date for purchased credit impaired loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Amount (In thousands) Contractually required principal and interest $ 83,710 Non-accretable difference (28,516 ) Cash flows expected to be collected 55,194 Accretable yield (3,662 ) Total purchased credit impaired loans acquired $ 51,532

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Fair Value	The amortized cost and approximate fair value of investments in securities, all of which are classified as available for sale according to management’s intent, are summarized as follows (in thousands): Amortized Cost Gross Gross Estimated Fair Value As of June 30, 2016 U.S. Treasury securities $ 226,751 $ 5,246 $ — $ 231,997 U.S. Agency securities 49,641 366 — 50,007 Mortgage-backed securities: Government National Mortgage Association 705,180 5,786 (1,388 ) 709,578 Federal National Mortgage Association 178,320 1,814 — 180,134 Small Business Assistance Program 146,746 2,550 — 149,296 States and political subdivision securities 33,934 192 (28 ) 34,098 Corporate debt securities 4,997 2 — 4,999 Other 1,013 42 — 1,055 Total $ 1,346,582 $ 15,998 $ (1,416 ) $ 1,361,164 Amortized Cost Gross Gross Estimated Fair Value As of September 30, 2015 U.S. Treasury securities $ 250,986 $ 3,811 $ — $ 254,797 U.S. Agency securities 74,412 643 — 75,055 Mortgage-backed securities: Government National Mortgage Association 842,460 3,663 (4,503 ) 841,620 Federal National Mortgage Association 46,449 96 — 46,545 Small Business Assistance Program 101,415 233 (213 ) 101,435 States and political subdivision securities 1,849 1 — 1,850 Corporate debt securities 4,996 — (13 ) 4,983 Other 1,006 36 — 1,042 Total $ 1,323,573 $ 8,483 $ (4,729 ) $ 1,327,327
Marketable Securities	The amortized cost and approximate fair value of debt securities available for sale as of June 30, 2016 and September 30, 2015 , by contractual maturity, are shown below. Maturities of mortgage-backed securities may differ from contractual maturities because the mortgages underlying the securities may be called or repaid without any penalties. June 30, 2016 September 30, 2015 (In Thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 53,129 $ 53,503 $ 76,261 $ 76,905 Due after one year through five years 254,775 260,136 255,982 259,780 Due after five years through ten years 7,297 7,340 — — Due after ten years 122 122 — — 315,323 321,101 332,243 336,685 Mortgage-backed securities 1,030,246 1,039,008 990,324 989,600 Securities without contractual maturities 1,013 1,055 1,006 1,042 Total $ 1,346,582 $ 1,361,164 $ 1,323,573 $ 1,327,327
Schedule of Unrealized Loss on Investments	The following table presents the Company’s gross unrealized losses and approximate fair value in investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands): June 30, 2016 Less than 12 months 12 months or more Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Mortgage-backed securities $ 101 $ (1 ) $ 199,274 $ (1,387 ) $ 199,375 $ (1,388 ) Corporate debt securities — — — — — — States and political subdivision securities 4,393 (28 ) — — 4,393 (28 ) Total $ 4,494 $ (29 ) $ 199,274 $ (1,387 ) $ 203,768 $ (1,416 ) September 30, 2015 Less than 12 months 12 months or more Total Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Mortgage-backed securities $ 58,604 $ (236 ) $ 412,058 $ (4,480 ) $ 470,662 $ (4,716 ) Corporate debt securities 4,984 (13 ) — — 4,984 (13 ) States and political subdivision securities — — — — — — Total $ 63,588 $ (249 ) $ 412,058 $ (4,480 ) $ 475,646 $ (4,729 )
Unrealized Gain (Loss) on Investments	The components of accumulated other comprehensive income (loss) from net unrealized gains (losses) on securities available for sale for the three and nine months ended June 30, 2016 and 2015 , respectively are as follows (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance accumulated other comprehensive income (loss) $ 4,709 $ 2,111 $ 2,318 $ (6,157 ) Net unrealized holding gain arising during the period 6,837 (6,099 ) 11,024 7,186 Reclassification adjustment for net gain (loss) realized in net income 134 — (196 ) (51 ) Net change in unrealized gain before income taxes 6,971 (6,099 ) 10,828 7,135 Income tax (expense) (2,649 ) 2,254 (4,115 ) (2,712 ) Net change in unrealized gain on securities after taxes 4,322 (3,845 ) 6,713 4,423 Ending balance accumulated other comprehensive income $ 9,031 $ (1,734 ) $ 9,031 $ (1,734 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Schedule of Loans Receivable	The composition of loans as of June 30, 2016 and September 30, 2015 , is as follows (in thousands): June 30, 2016 September 30, 2015 Residential real estate $ 1,032,355 $ 921,827 Commercial real estate 3,657,024 2,845,748 Commercial non real estate 1,746,257 1,610,828 Agriculture 2,101,601 1,861,465 Consumer 79,814 73,049 Other 45,444 38,371 Ending balance 8,662,495 7,351,288 Less: Unamortized discount on acquired loans (42,793 ) (19,264 ) Unearned net deferred fees and costs and loans in process (12,728 ) (6,826 ) Total $ 8,606,974 $ 7,325,198
Schedule of Company's Nonaccrual Loans	The following table presents the Company’s nonaccrual loans at June 30, 2016 and September 30, 2015 (in thousands), excluding ASC 310-30 loans. Loans greater than 90 days past due and still accruing interest as of June 30, 2016 and September 30, 2015 , were not significant. Nonaccrual loans June 30, 2016 September 30, 2015 Residential real estate $ 5,834 $ 7,642 Commercial real estate 10,331 9,556 Commercial non real estate 11,678 14,281 Agriculture 62,356 24,569 Consumer 88 107 Total $ 90,287 $ 56,155
Composition of Loan Portfolio by Internal Risk Rating	This table (in thousands) is presented net of unamortized discount on acquired loans and excludes loans measured at fair value with changes in fair value reported in earnings of $1.16 billion at June 30, 2016 and $1.12 billion at September 30, 2015 : As of June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Credit Risk Profile by Internally Assigned Grade Grade: Pass $ 921,503 $ 3,128,241 $ 1,148,620 $ 1,426,550 $ 78,478 $ 45,444 $ 6,748,836 Watchlist 5,212 108,694 69,731 212,049 207 — 395,893 Substandard 10,705 61,864 29,504 135,222 315 — 237,610 Doubtful 103 155 523 — — — 781 Loss — — — — — — — Ending balance 937,523 3,298,954 1,248,378 1,773,821 79,000 45,444 7,383,120 Loans covered by FDIC loss sharing agreements 80,137 — — — — — 80,137 Total $ 1,017,660 $ 3,298,954 $ 1,248,378 $ 1,773,821 $ 79,000 $ 45,444 $ 7,463,257 As of September 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Credit Risk Profile by Internally Assigned Grade Grade: Pass $ 799,359 $ 2,384,980 $ 1,053,091 $ 1,272,312 $ 72,705 $ 38,371 $ 5,620,818 Watchlist 4,890 66,024 50,242 189,144 78 — 310,378 Substandard 11,877 56,905 60,801 53,837 223 — 183,643 Doubtful 323 200 682 256 7 — 1,468 Loss — — — — — — — Ending balance 816,449 2,508,109 1,164,816 1,515,549 73,013 38,371 6,116,307 Loans covered by FDIC loss sharing agreements 97,030 — — — — — 97,030 Total $ 913,479 $ 2,508,109 $ 1,164,816 $ 1,515,549 $ 73,013 $ 38,371 $ 6,213,337
Past Due Financing Receivables	The following table (in thousands) presents the Company’s past due loans at June 30, 2016 and September 30, 2015 . This table is presented net of unamortized discount on acquired loans and excludes loans measured at fair value with changes in fair value reported in earnings of $1.16 billion at June 30, 2016 and $1.12 billion at September 30, 2015 . As of June 30, 2016 30-59 Days 60-89 Days 90 Days or Greater Past Due Total Current Total Residential real estate $ 1,242 $ 877 $ 1,399 $ 3,518 $ 934,005 $ 937,523 Commercial real estate 42 224 5,433 5,699 3,293,255 3,298,954 Commercial non real estate 182 436 8,589 9,207 1,239,171 1,248,378 Agriculture 4,343 7,972 4,735 17,050 1,756,771 1,773,821 Consumer 157 26 7 190 78,810 79,000 Other — — — — 45,444 45,444 Ending balance 5,966 9,535 20,163 35,664 7,347,456 7,383,120 Loans covered by FDIC loss sharing agreements 849 496 260 1,605 78,532 80,137 Total $ 6,815 $ 10,031 $ 20,423 $ 37,269 $ 7,425,988 $ 7,463,257 As of September 30, 2015 30-59 Days 60-89 Days 90 Days or Greater Past Due Total Current Total Residential real estate $ 486 $ 858 $ 2,776 $ 4,120 $ 812,329 $ 816,449 Commercial real estate 1,708 1,204 4,247 7,159 2,500,950 2,508,109 Commercial non real estate 697 7,944 4,072 12,713 1,152,103 1,164,816 Agriculture 2,161 175 6,264 8,600 1,506,949 1,515,549 Consumer 232 8 37 277 72,736 73,013 Other — — — — 38,371 38,371 Ending balance 5,284 10,189 17,396 32,869 6,083,438 6,116,307 Loans covered by FDIC loss sharing agreements 2,455 594 873 3,922 93,108 97,030 Total $ 7,739 $ 10,783 $ 18,269 $ 36,791 $ 6,176,546 $ 6,213,337
Impaired Financing Receivables	The following table presents the Company’s impaired loans (in thousands). This table excludes loans covered by FDIC loss sharing agreements: June 30, 2016 September 30, 2015 Recorded Unpaid Related Recorded Unpaid Related Impaired loans: With an allowance recorded: Residential real estate $ 10,983 $ 11,942 $ 3,173 $ 12,364 $ 12,602 $ 2,784 Commercial real estate 69,602 70,665 7,602 67,751 69,722 4,644 Commercial non real estate 31,066 33,260 5,045 65,495 76,647 5,657 Agriculture 135,222 137,479 11,761 54,093 54,699 3,950 Consumer 327 510 69 230 359 50 Total $ 247,200 $ 253,856 $ 27,650 $ 199,933 $ 214,029 $ 17,085 The average recorded investment on impaired loans and interest income recognized on impaired loans for the three and nine months ended June 30, 2016 and 2015 , respectively, are as follows (in thousands): Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 Nine Months Ended Nine Months Ended Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Residential real estate $ 11,743 $ 438 $ 12,413 $ 453 $ 11,899 $ 877 $ 12,336 $ 1,398 Commercial real estate 78,962 3,193 75,665 3,106 76,159 6,666 72,287 9,498 Commercial non real estate 37,322 1,162 49,705 2,308 44,365 2,284 45,409 5,753 Agriculture 118,056 5,359 44,405 1,232 102,065 11,054 42,186 3,019 Consumer 314 38 238 24 293 80 249 75 Total $ 246,397 $ 10,190 $ 182,426 $ 7,123 $ 234,781 $ 20,961 $ 172,467 $ 19,743 The following table provides purchased credit impaired loans at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Outstanding 1 Recorded 2 Carrying 3 Outstanding 1 Recorded 2 Carrying 3 Residential real estate $ 83,624 $ 70,993 $ 69,692 $ 93,979 $ 82,189 $ 80,565 Commercial real estate 131,309 45,670 44,826 97,302 20,710 19,628 Commercial non real estate 11,819 4,591 4,591 10,387 2,759 2,689 Agriculture 20,042 16,115 16,115 1,538 1,538 1,538 Consumer 1,178 1,009 1,009 1,368 1,271 1,271 Total lending $ 247,972 $ 138,378 $ 136,233 $ 204,574 $ 108,467 $ 105,691 1 Represents the legal balance of loans acquired with deteriorated credit quality. 2 Represents the book balance of loans acquired with deteriorated credit quality. 3 Represents the book balance of loans acquired with deteriorated credit quality net of the related allowance for loan and lease losses.
Troubled Debt Restructurings on Financing Receivables	The following table presents the recorded value of the Company’s TDR balances as of June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Accruing Nonaccrual Accruing Nonaccrual Residential real estate $ 413 $ 1,090 $ 452 $ 1,547 Commercial real estate 17,851 3,429 30,917 4,725 Commercial non real estate 7,255 1,539 8,928 833 Agriculture 19,610 32,723 20,041 6,857 Consumer 32 9 33 4 Total $ 45,161 $ 38,790 $ 60,371 $ 13,966 The following table presents a summary of all accruing loans restructured in TDRs during the three months ended June 30, 2016 and 2015 , respectively: Three Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — — $ — $ — Term extension 1 42 42 1 35 35 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total residential real estate 1 42 42 1 35 35 Commercial real estate Rate modification — — — — — — Term extension — — — 1 574 574 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — 1 574 574 Commercial non real estate Rate modification — — — — — — Term extension 3 57 57 — — — Payment modification 1 878 878 — — — Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate 4 935 935 — — — Agriculture Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total agriculture — — — — — — Consumer Rate modification — — — — — — Term extension — — — — — — Payment modification — — — 1 18 18 Bankruptcy — — — — — — Other — — — — — — Total consumer — — — 1 18 18 Total accruing 5 $ 977 $ 977 3 $ 627 $ 627 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification — $ — $ — — $ — $ — The following table presents a summary of all accruing loans restructured in TDRs during the nine months ended June 30, 2016 and 2015 , respectively: Nine Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — 1 $ 15 $ 15 Term extension 1 42 42 1 35 35 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — 1 21 21 Total residential real estate 1 42 42 3 71 71 Commercial real estate Rate modification — — — — — — Term extension 2 1,898 1,898 2 664 574 Payment modification — — — 6 22,542 22,542 Bankruptcy — — — 1 498 498 Other 3 6,714 6,714 — — — Total commercial real estate 5 8,612 8,612 9 23,704 23,614 Commercial non real estate Rate modification 1 49 49 1 32 32 Term extension 4 115 115 3 2,879 2,879 Payment modification 2 948 948 2 1,874 1,874 Bankruptcy — — — — — — Other 3 3,849 3,849 — — — Total commercial non real estate 10 4,961 4,961 6 4,785 4,785 Agriculture Rate modification — — — — — — Term extension 13 26,914 26,914 — — — Payment modification 4 989 989 — — — Bankruptcy — — — — — — Other — — — — — — Total agriculture 17 27,903 27,903 — — — Consumer Rate modification — — — — — — Term extension — — — — — — Payment modification — — — 1 18 18 Bankruptcy — — — 1 6 6 Other — — — — — — Total consumer — — — 2 24 24 Total accruing 33 $ 41,518 $ 41,518 20 $ 28,584 $ 28,494 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification — $ — $ — 1 $ 90 $ — The following table presents a summary of all non-accruing loans restructured in TDRs during the three months ended June 30, 2016 and 2015 : Three Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — — $ — $ — Term extension — — — 1 — — Payment modification 1 50 49 1 19 19 Bankruptcy — — — — — — Other — — — 1 25 10 Total residential real estate 1 50 49 3 44 29 Commercial real estate Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — — — — Commercial Non Real Estate Rate modification — — — — — — Term extension — — — 1 77 — Payment modification — — — 1 4 4 Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate — — — 2 81 4 Agriculture Rate modification — — — — — — Term extension 1 101 100 — — — Payment modification 4 932 887 — — — Bankruptcy — — — — — — Other 1 96 96 — — — Total agriculture 6 1,129 1,083 — — — Consumer Rate modification — — — — — — Term extension — — — 1 1 1 Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total consumer — — — 1 1 1 Total non-accruing 7 $ 1,179 $ 1,132 6 $ 126 $ 34 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification 7 $ 47 $ — 2 $ 92 $ — The following table presents a summary of all non-accruing loans restructured in TDRs during the nine months ended June 30, 2016 and 2015 : Nine Months Ended June 30, 2016 2015 Recorded Investment Recorded Investment (in thousands) Number Pre- Post- Number Pre- Post- Residential real estate Rate modification — $ — $ — 2 $ 104 $ 104 Term extension — — — 2 77 77 Payment modification 2 237 236 1 19 19 Bankruptcy — — — 1 43 43 Other — — — 1 25 10 Total residential real estate 2 237 236 7 268 253 Commercial real estate Rate modification — — — — — — Term extension — — — — — — Payment modification — — — — — — Bankruptcy — — — — — — Other — — — — — — Total commercial real estate — — — — — — Commercial Non Real Estate Rate modification — — — — — — Term extension — — — 5 294 217 Payment modification 2 760 760 1 4 4 Bankruptcy — — — — — — Other — — — — — — Total commercial non real estate 2 760 760 6 298 221 Agriculture Rate modification — — — — — — Term extension 1 101 100 — — — Payment modification 4 932 887 — — — Bankruptcy — — — — — — Other 1 96 96 — — — Total agriculture 6 1,129 1,083 — — — Consumer Rate modification — — — — — — Term extension — — — 2 2 2 Payment modification — — — — — — Bankruptcy 1 8 8 — — — Other — — — — — — Total consumer 1 8 8 2 2 2 Total non-accruing 11 $ 2,134 $ 2,087 15 $ 568 $ 476 Change in recorded investment due to principal paydown at time of modification — $ — $ — — $ — $ — Change in recorded investment due to chargeoffs at time of modification 7 $ 47 $ — 2 $ 92 $ — The tables below represent defaults on loans that were first modified during the respective past 12 months, that became 90 days or more delinquent or were charged-off during the three and nine months ended June 30, 2016 and 2015 , respectively. Three Months Ended Nine Months Ended 2016 2015 2016 2015 ($ in thousands) Number of Recorded Number of Recorded Number of Recorded Number of Recorded Residential real estate — $ — 1 $ 10 1 $ — 4 $ 353 Commercial real estate — — — — — — — — Commercial non real estate 2 275 2 32 2 275 4 32 Agriculture 1 760 3 782 3 760 3 782 Consumer — — — — — — — — Total 3 $ 1,035 6 $ 824 6 $ 1,035 11 $ 1,167

Allowance for Loan and Lease 34

Allowance for Loan and Lease Losses (Tables)	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Allowance for credit losses on financing receivables	The following tables presents the Company’s allowance for loan and lease losses roll forward for the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance April 1, 2016 $ 8,796 $ 20,904 $ 12,631 $ 18,323 $ 336 $ 927 $ 61,917 Charge-offs (257 ) (291 ) (1,936 ) (1,133 ) (37 ) (497 ) (4,151 ) Recoveries 133 77 235 262 61 337 1,105 Provision (778 ) (713 ) 1,200 5,634 79 304 5,726 (Improvement) impairment of ASC 310-30 loans (205 ) (149 ) — — — — (354 ) Ending balance June 30, 2016 $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Three Months Ended June 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance April 1, 2015 $ 7,495 $ 15,736 $ 15,957 $ 12,222 $ 189 $ 827 $ 52,426 Charge-offs (77 ) (280 ) (1,337 ) (411 ) (31 ) (356 ) (2,492 ) Recoveries 84 205 949 10 32 306 1,586 Provision (325 ) 2,130 1,381 1,545 164 96 4,991 (Improvement) impairment of (625 ) 45 — — (1 ) — (581 ) Ending balance June 30, 2015 $ 6,552 $ 17,836 $ 16,950 $ 13,366 $ 353 $ 873 $ 55,930 Nine Months Ended June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance October 1, $ 8,025 $ 18,014 $ 15,996 $ 13,952 $ 348 $ 865 $ 57,200 Charge-offs (959 ) (1,063 ) (2,193 ) (2,257 ) (183 ) (1,494 ) (8,149 ) Recoveries 472 568 875 386 131 868 3,300 Provision 463 2,547 (2,478 ) 11,005 143 832 12,512 (Impairment) improvement of (312 ) (238 ) (70 ) — — — (620 ) Ending balance June 30, 2016 $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Nine Months Ended June 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Beginning balance October 1, $ 8,342 $ 16,884 $ 10,550 $ 10,655 $ 264 $ 823 $ 47,518 Charge-offs (197 ) (1,932 ) (9,861 ) (438 ) (88 ) (1,187 ) (13,703 ) Recoveries 197 300 3,092 89 79 950 4,707 Provision (515 ) 2,476 13,169 3,060 123 287 18,600 (Impairment) improvement of (1,275 ) 108 — — (25 ) — (1,192 ) Ending balance June 30, 2015 $ 6,552 $ 17,836 $ 16,950 $ 13,366 $ 353 $ 873 $ 55,930 The following tables provide details regarding the allowance for loan and lease losses and balance by type of allowance. These tables (in thousands) are presented net of unamortized discount on acquired loans and excludes loans of $1.16 billion measured at fair value (and the associated credit mark embedded within the carrying value of these loans) with changes in fair value reported in earnings, loans held for sale of $21.3 million , and guaranteed loans of $128.0 million for June 30, 2016 and loans measured at fair value with changes in fair value reported in earnings of $1.12 billion , loans held for sale of $9.9 million , and guaranteed loans of $105.0 million for September 30, 2015 . As of June 30, 2016 Residential Commercial Commercial Agriculture Consumer Other Total Allowance for loan and lease losses Individually evaluated for impairment $ 3,172 $ 7,570 $ 5,038 $ 11,761 $ 69 $ — $ 27,610 Collectively evaluated for impairment 3,216 11,414 7,092 11,325 370 1,071 34,488 ASC 310-30 loans 1,301 844 — — — — 2,145 Total allowance $ 7,689 $ 19,828 $ 12,130 $ 23,086 $ 439 $ 1,071 $ 64,243 Financing Receivables Individually evaluated for impairment $ 10,413 $ 47,576 $ 29,681 $ 100,641 $ 281 $ — $ 188,592 Collectively evaluated for impairment 914,322 3,132,124 1,170,544 1,646,828 77,710 45,444 6,986,972 ASC 310-30 loans 70,993 45,670 4,591 16,115 1,009 — 138,378 Loans Outstanding $ 995,728 $ 3,225,370 $ 1,204,816 $ 1,763,584 $ 79,000 $ 45,444 $ 7,313,942 As of September 30, 2015 Residential Commercial Commercial Agriculture Consumer Other Total Allowance for loan and lease losses Individually evaluated for impairment $ 2,783 $ 4,585 $ 5,624 $ 3,950 $ 50 $ — $ 16,992 Collectively evaluated for impairment 3,618 12,347 10,302 10,002 298 865 37,432 ASC 310-30 loans 1,624 1,082 70 — — — 2,776 Total allowance $ 8,025 $ 18,014 $ 15,996 $ 13,952 $ 348 $ 865 $ 57,200 Financing Receivables Individually evaluated for impairment $ 13,106 $ 49,794 $ 62,158 $ 44,253 $ 193 $ — $ 169,504 Collectively evaluated for impairment 806,912 2,385,636 1,056,806 1,461,230 71,549 38,371 5,820,504 ASC 310-30 loans 82,189 20,710 2,759 1,538 1,271 — 108,467 Loans Outstanding $ 902,207 $ 2,456,140 $ 1,121,723 $ 1,507,021 $ 73,013 $ 38,371 $ 6,098,475

Accounting for Certain Loans 35

Accounting for Certain Loans Acquired with Deteriorated Credit Quality (Tables)	9 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Troubled Debt Restructurings on Financing Receivables	The re-assessment of purchased credit impaired loans resulted in the following changes in the accretable yield during the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Balance at beginning of period $ 39,843 $ 43,431 $ 44,489 $ 50,889 Acquisition 3,662 — 3,662 — Accretion (2,529 ) (3,240 ) (7,119 ) (11,249 ) Reclassification from (to) nonaccretable difference — 7,736 (56 ) 8,367 Disposals — (1,038 ) — (1,118 ) Balance at end of period $ 40,976 $ 46,889 $ 40,976 $ 46,889
Impaired Financing Receivables	The following table presents the Company’s impaired loans (in thousands). This table excludes loans covered by FDIC loss sharing agreements: June 30, 2016 September 30, 2015 Recorded Unpaid Related Recorded Unpaid Related Impaired loans: With an allowance recorded: Residential real estate $ 10,983 $ 11,942 $ 3,173 $ 12,364 $ 12,602 $ 2,784 Commercial real estate 69,602 70,665 7,602 67,751 69,722 4,644 Commercial non real estate 31,066 33,260 5,045 65,495 76,647 5,657 Agriculture 135,222 137,479 11,761 54,093 54,699 3,950 Consumer 327 510 69 230 359 50 Total $ 247,200 $ 253,856 $ 27,650 $ 199,933 $ 214,029 $ 17,085 The average recorded investment on impaired loans and interest income recognized on impaired loans for the three and nine months ended June 30, 2016 and 2015 , respectively, are as follows (in thousands): Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 Nine Months Ended Nine Months Ended Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Average Interest Income Recognized while on Impaired Status Residential real estate $ 11,743 $ 438 $ 12,413 $ 453 $ 11,899 $ 877 $ 12,336 $ 1,398 Commercial real estate 78,962 3,193 75,665 3,106 76,159 6,666 72,287 9,498 Commercial non real estate 37,322 1,162 49,705 2,308 44,365 2,284 45,409 5,753 Agriculture 118,056 5,359 44,405 1,232 102,065 11,054 42,186 3,019 Consumer 314 38 238 24 293 80 249 75 Total $ 246,397 $ 10,190 $ 182,426 $ 7,123 $ 234,781 $ 20,961 $ 172,467 $ 19,743 The following table provides purchased credit impaired loans at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Outstanding 1 Recorded 2 Carrying 3 Outstanding 1 Recorded 2 Carrying 3 Residential real estate $ 83,624 $ 70,993 $ 69,692 $ 93,979 $ 82,189 $ 80,565 Commercial real estate 131,309 45,670 44,826 97,302 20,710 19,628 Commercial non real estate 11,819 4,591 4,591 10,387 2,759 2,689 Agriculture 20,042 16,115 16,115 1,538 1,538 1,538 Consumer 1,178 1,009 1,009 1,368 1,271 1,271 Total lending $ 247,972 $ 138,378 $ 136,233 $ 204,574 $ 108,467 $ 105,691 1 Represents the legal balance of loans acquired with deteriorated credit quality. 2 Represents the book balance of loans acquired with deteriorated credit quality. 3 Represents the book balance of loans acquired with deteriorated credit quality net of the related allowance for loan and lease losses.

FDIC Indemnification Asset (Tab

FDIC Indemnification Asset (Tables)	9 Months Ended
	Jun. 30, 2016
Banking and Thrift [Abstract]
FDIC indemnification asset roll forward	The following table represents a summary of the activity related to the FDIC indemnification asset for the three and nine months ended June 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Balance at beginning of period $ 12,875 $ 19,895 $ 14,722 $ 26,678 Amortization (959 ) (1,754 ) (2,886 ) (6,347 ) Changes in expected reimbursements from FDIC for changes in expected credit losses (14 ) 15 (141 ) (175 ) Changes in reimbursable expenses (268 ) (1,148 ) (695 ) (1,511 ) Payments (reimbursements) of covered losses from the FDIC 72 (29 ) 706 (1,666 ) Balance at end of period $ 11,706 $ 16,979 $ 11,706 $ 16,979

Derivative Financial Instrume37

Derivative Financial Instruments (Tables)	9 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Positions, Notional Amounts	The following table summarizes the notional amounts and estimated fair values of the Company’s derivative instruments at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 Notional Balance Sheet Positive Fair Negative Fair Derivatives not designated as hedging instruments: Interest rate swaps $ 1,071,795 Liabilities $ — $ (91,066 ) Mortgage loan commitments 57,704 Assets 253 — Mortgage loan forward sale contracts 75,195 Liabilities — (253 ) September 30, 2015 Notional Balance Sheet Positive Fair Negative Fair Derivatives not designated as hedging instruments: Interest rate swaps $ 1,087,505 Liabilities $ 41 $ (53,559 ) Mortgage loan commitments 30,196 Assets 95 — Mortgage loan forward sale contracts 36,655 Liabilities — (95 )
Schedule of Derivative Instruments, Effect on Other Comprehensive Income	The effect of derivatives on the consolidated statements of comprehensive income for the three and nine months ended June 30, 2016 and 2015 (in thousands) was as follows: Amount of Gain (Loss) Recognized in Income Three Months Ended Nine Months Ended Location of 2016 2015 2016 2015 Derivatives not designated as hedging instruments: Interest rate swaps Noninterest income $ (21,925 ) $ 18,946 $ (53,379 ) $ (27,357 ) Mortgage loan commitments Noninterest income 201 (26 ) 253 1 Mortgage loan forward sale contracts Noninterest income (201 ) 26 (253 ) (1 )
Summary of Offsetting Assets	The following tables (in thousands) present the Company's total gross derivative assets and liabilities at June 30, 2016 and September 30, 2015 , which are adjusted on an aggregate basis, where applicable, to take into consideration the effects of legally enforceable master netting agreements for the net reported amount in the consolidated balance sheets. These amounts are offset on the consolidated balance sheets. Gross Amount Net Amount Held/Pledged 1 Net June 30, 2016 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ — $ — $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (91,066 ) — (91,066 ) 91,066 — Total derivative financial liabilities $ (91,066 ) $ — $ (91,066 ) $ 91,066 $ — 1 The actual amount of collateral exceeds the fair value exposure, at the individual counterparty level, as of the date presented. Gross Amount Net Amount Held/Pledged Net September 30, 2015 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ 41 $ (41 ) $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (53,559 ) 41 (53,518 ) 53,518 — Total derivative financial liabilities $ (53,518 ) $ — $ (53,518 ) $ 53,518 $ —
Summary of Offsetting Liabilities	The following tables (in thousands) present the Company's total gross derivative assets and liabilities at June 30, 2016 and September 30, 2015 , which are adjusted on an aggregate basis, where applicable, to take into consideration the effects of legally enforceable master netting agreements for the net reported amount in the consolidated balance sheets. These amounts are offset on the consolidated balance sheets. Gross Amount Net Amount Held/Pledged 1 Net June 30, 2016 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ — $ — $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (91,066 ) — (91,066 ) 91,066 — Total derivative financial liabilities $ (91,066 ) $ — $ (91,066 ) $ 91,066 $ — 1 The actual amount of collateral exceeds the fair value exposure, at the individual counterparty level, as of the date presented. Gross Amount Net Amount Held/Pledged Net September 30, 2015 Derivative financial assets: Derivatives subject to master netting arrangement or similar arrangement $ 41 $ (41 ) $ — $ — $ — Derivative financial liabilities: Derivatives subject to master netting arrangement or similar arrangement (53,559 ) 41 (53,518 ) 53,518 — Total derivative financial liabilities $ (53,518 ) $ — $ (53,518 ) $ 53,518 $ —

The Fair Value Option For Cer38

The Fair Value Option For Certain Loans (Tables)	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Summary of Fair Value Option	Changes in fair value for items for which the fair value option has been elected and the line items in which these changes are reported within the consolidated statements of comprehensive income are as follows for the three and nine months ended June 30, 2016 and 2015 (in thousands): For the Three Months Ended For the Nine Months Ended June 30, 2016 June 30, 2015 June 30, 2016 June 30, 2015 Noninterest Total Changes Noninterest Total Changes Noninterest Total Changes Noninterest Total Changes Long-term loans and written loan commitments $ 14,197 $ 14,197 $ (24,394 ) $ (24,394 ) $ 35,252 $ 35,252 $ 7,914 $ 7,914

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of changes to the carrying amount of goodwill	A summary of changes to the carrying amount of goodwill is as follows (in thousands): June 30, 2016 September 30, 2015 Balance, beginning of period $ 697,807 $ 697,807 Goodwill acquired during the period 40,653 — Balance, end of period $ 738,460 $ 697,807

Core Deposits and Other Intan40

Core Deposits and Other Intangibles (Tables)	9 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-lived Intangible Assets	The methods and lives used to amortize intangible assets are as follows: Intangible Method Years Core deposit Straight-line or effective yield 5 - 10 Brand intangible Straight-line 15 Customer relationships Straight-line 8.5 Other intangibles Straight-line 1.25 - 9.33 A summary of intangible assets subject to amortization is as follows (in thousands): Core Deposit Brand Customer Other Intangible Total As of June 30, 2016 Gross carrying amount $ 100,018 $ 8,464 $ 16,089 $ 538 $ 125,109 Accumulated amortization (92,455 ) (4,559 ) (15,326 ) (12 ) (112,352 ) Net intangible assets $ 7,563 $ 3,905 $ 763 $ 526 $ 12,757 As of September 30, 2015 Gross carrying amount $ 92,679 $ 8,464 $ 16,089 $ — $ 117,232 Accumulated amortization (92,073 ) (4,136 ) (13,904 ) — (110,113 ) Net intangible assets $ 606 $ 4,328 $ 2,185 $ — $ 7,119
Schedule of Finite-lived Intangible Assets, Future Amortization Expense	Estimated amortization expense of intangible assets in subsequent fiscal years is as follows (in thousands): Remaining in 2016 $ 1,024 2017 2,342 2018 1,614 2019 1,489 2020 1,363 2021 and thereafter 4,925 Total $ 12,757

Loan Servicing Rights (Tables)

Loan Servicing Rights (Tables)	9 Months Ended
	Jun. 30, 2016
Transfers and Servicing [Abstract]
Schedule of loan servicing rights and valuation allowance activity	The following table is the activity for loan servicing rights and the related valuation allowance (in thousands): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Loan servicing rights, beginning of period $ — $ — $ — $ — Acquired in HF Financial acquisition 6,573 — 6,573 — Additions — — — — Amortization (1) (166 ) — (166 ) — Loan servicing rights, end of period $ 6,407 $ — $ 6,407 $ — Valuation allowance, beginning of period $ — $ — $ — $ — Additions / (reductions) (1) (176 ) — (176 ) — Valuation allowance, end of period $ (176 ) $ — $ (176 ) $ — Loan servicing rights, net $ 6,231 $ — $ 6,231 $ — Servicing fees received $ 306 $ — $ 306 $ — Balance of loans serviced at: Beginning of period — — — — End of period 914,694 — 914,694 — (1) Changes to carrying amounts are reported net of loan servicing income on the consolidated statements of comprehensive income for the periods presented.

Securities Sold Under Agreeme42

Securities Sold Under Agreements to Repurchase (Tables)	9 Months Ended
	Jun. 30, 2016
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Schedule of Repurchase Agreements	The following tables present the gross obligation by the class of collateral pledged and the remaining contractual maturity of the agreements at June 30, 2016 and September 30, 2015 (in thousands). June 30, 2016 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements U.S. Treasury and agency $ — $ — $ — $ — $ — Mortgage-backed securities 156,072 — — 2,944 159,016 Total repurchase agreements $ 156,072 $ — $ — $ 2,944 $ 159,016 September 30, 2015 Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30-90 Days Greater than 90 Days Total Repurchase agreements U.S. Treasury and agency $ 64,252 $ — $ — $ — $ 64,252 Mortgage-backed securities 118,147 — — 2,872 121,019 Total repurchase agreements $ 182,399 $ — $ — $ 2,872 $ 185,271

FHLB Advances and Other Borro43

FHLB Advances and Other Borrowings (Tables)	9 Months Ended
	Jun. 30, 2016
Federal Home Loan Banks [Abstract]
Schedule of FHLB Advances and Other Borrowings	FHLB advances and other borrowings consist of the following at June 30, 2016 and September 30, 2015 (in thousands): June 30, 2016 September 30, 2015 Notes payable to Federal Home Loan Bank (FHLB), interest rates from 0.43% to 3.66% and maturity dates from October 2016 to July 2023, collateralized by real estate loans and FHLB stock, with various call dates at the option of the FHLB $ 520,000 $ 581,000 Federal Home Loan Bank fed funds advance, interest rate of 0.42% to 0.52%, maturity dates from July 2016 to September 2016 393,155 — Other 173 — Total 913,328 581,000 Fair value adjustment (1) 49 — Total FHLB advances and other borrowings $ 913,377 $ 581,000 (1) Adjustment reflects the fair value adjustments related to the FHLB advances and notes payable assumed as part of the HF Financial acquisition.
Schedule of FHLB Advances and Other Borrowings by Maturity Date	As of June 30, 2016 , FHLB advances and other borrowings are due or callable (whichever is earlier) in subsequent fiscal years as follows (in thousands): Remaining in 2016 $ 393,328 2017 29,000 2018 31,000 2019 — 2020 — 2021 and thereafter 460,000 Total $ 913,328

Subordinated Debentures and S44

Subordinated Debentures and Subordinated Notes Payable (Tables)	9 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Summary of subordinated debentures and subordinated notes payable	Subordinated debentures and subordinated notes payable are summarized as follows (in thousands): June 30, 2016 September 30, 2015 Amount outstanding Common Shares Held in Other Assets Amount outstanding Common Shares Held in Other Assets Junior subordinated debentures payable to nonconsolidated trusts GW Statutory Trust IV, variable rate of 2.85%, plus 3 month LIBOR $ 23,093 $ 693 $ 23,093 $ 693 GW Statutory Trust VI, variable rate of 1.48%, plus 3 month LIBOR 30,928 928 30,928 928 SSB Trust II, variable rate of 1.85%, plus 3 month LIBOR 2,062 62 2,062 62 HFB Trust III, variable rate of 3.35%, plus 3 month LIBOR 5,155 155 — — HFB Trust IV, variable rate of 3.10%, plus 3 month LIBOR 7,217 217 — — HFB Trust V, variable rate of 1.83%, plus 3 month LIBOR 10,310 310 — — HFB Trust VI, variable rate of 1.65%, plus 3 month LIBOR 2,155 155 — — Total junior subordinated debentures payable 80,920 $ 2,520 56,083 $ 1,683 Less: fair value adjustment (1) (3,792 ) — Total junior subordinated debentures payable, net of fair value adjustment 77,128 56,083 Subordinated notes payable Fixed to floating rate, 4.875% per annum 35,000 35,000 Less: unamortized debt issuance costs (301 ) (356 ) Total subordinated notes payable 34,699 34,644 Total subordinated debentures and subordinated notes payable $ 111,827 $ 90,727 (1) Adjustment reflects the fair value adjustments related to the junior subordinated deferrable interest debentures assumed as part of the HF Financial acquisition.

Profit-Sharing Plan and Defin45

Profit-Sharing Plan and Defined Benefit Plans (Tables)	9 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Components of Net Periodic Benefit Cost	Information relative to the components of net periodic benefit cost measured at/or for the three and nine months ended June 30, 2016 and 2015 for the defined benefit plan is presented below (in thousands): Three Months Ended June 30, Nine Months Ended June 30, 2016 2015 2016 2015 Net periodic benefit cost Service cost $ 8 $ — $ 8 $ — Interest cost 109 — 109 — Expected return on plan assets (95 ) — (95 ) — Amortization of prior losses — — — — Net periodic benefit cost $ 22 $ — $ 22 $ —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-Based Compensation, Restricted Stock Units Award Activity	The following is a summary of the Plans’ restricted share and performance-based stock award activity as of June 30, 2016 and September 30, 2015 : June 30, 2016 September 30, 2015 Restricted Shares Common Shares Weighted-Average Common Shares Weighted-Average Restricted shares, beginning of fiscal year 80,446 $ 18.18 — $ — Granted 113,543 30.95 81,419 18.18 Vested and issued (25,729 ) 18.11 — — Forfeited (3,137 ) 20.94 (973 ) 18.00 Canceled — — — — Restricted shares, end of period 165,123 $ 26.92 80,446 $ 18.18 Vested, but not issuable at end of period 24,480 $ 26.14 12,221 $ 18.00 Performance Shares Performance shares, beginning of fiscal year 211,026 $ 18.00 — $ — Granted 43,371 30.78 221,294 18.00 Vested and issued (55 ) 18.00 — — Forfeited (14,440 ) 18.36 (10,268 ) 18.00 Canceled — — — — Performance shares, end of period 239,902 $ 20.29 211,026 $ 18.00

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurements, Assets and Liabilities	The following table presents the fair value measurements of assets and liabilities recognized in the accompanying consolidated balance sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall at June 30, 2016 and September 30, 2015 (in thousands): Fair Value Level 1 Level 2 Level 3 As of June 30, 2016 U.S. Treasury securities $ 231,997 $ 231,997 $ — $ — U.S. Agency securities 50,007 50,007 — — Mortgage-backed securities 1,039,008 — 1,039,008 — States and political subdivision securities 34,098 — 32,783 1,315 Corporate debt securities 4,999 — 4,999 — Other 1,055 — 1,055 — Securities available for sale $ 1,361,164 $ 282,004 $ 1,077,845 $ 1,315 Derivatives-assets $ 253 $ 253 $ — Derivatives-liabilities 91,319 — 91,319 — Fair value loans and written loan commitments 1,156,442 — 1,156,442 — Cash value of life insurance 28,945 — 28,945 — Fair Value Level 1 Level 2 Level 3 As of September 30, 2015 U.S. Treasury securities $ 254,797 $ 254,797 $ — $ — U.S. Agency securities 75,055 75,055 — — Mortgage-backed securities 989,600 — 989,600 — States and political subdivision securities 1,850 — 15 1,835 Corporate debt securities 4,983 — 4,983 — Other 1,042 — 1,042 — Securities available for sale $ 1,327,327 $ 329,852 $ 995,640 $ 1,835 Derivatives-assets $ 95 $ — $ 95 $ — Derivatives-liabilities 53,613 — 53,613 — Fair value loans and written loan commitments 1,118,687 — 1,118,687 — Cash value of life insurance 6,800 — 6,800 —
Schedule of Available-for-Sale Securities Reconciliation	The following table presents the changes in Level 3 financial instruments for the three and nine months ended June 30, 2016 and 2015 (in thousands): Other Securities Available for Sale Three months ended June 30, Nine months ended June 30, 2016 2015 2016 2015 Balance, beginning of period $ 1,458 $ 1,958 $ 1,835 $ 2,029 Additions 15 — 15 — Principal paydown (158 ) (124 ) (235 ) (195 ) Realized loss on securities — — (300 ) — Balance, end of period $ 1,315 $ 1,834 $ 1,315 $ 1,834
Mortgage Loans Held-for-Sale, Fair Value Measurement	The following tables present the fair value measurement of assets and liabilities measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at June 30, 2016 and September 30, 2015 (in thousands): Fair Value Level 1 Level 2 Level 3 As of June 30, 2016 Other real estate owned $ 3,985 $ — $ — $ 3,985 Impaired loans 160,151 — — 160,151 Loans held for sale, at lower of cost or fair value 21,301 — 21,301 — Loan servicing rights 6,231 — — 6,231 As of September 30, 2015 Other real estate owned $ 8,826 $ — $ — $ 8,826 Impaired loans 153,318 — — 153,318 Loans held for sale, at lower of cost or fair value 9,867 — 9,867 — Loan servicing rights — — — —
Mortgage Loans Held-for-Sale, Recurring and Nonrecurring Fair Value Measurements	The valuation techniques and significant unobservable inputs used to measure Level 3 fair value measurements at June 30, 2016 were as follows (in thousands): Financial Fair Value of Assets / (Liabilities) at June 30, 2016 Valuation Unobservable Range Weighted Other real estate owned $ 3,985 Appraisal value Property specific adjustment N/A N/A Impaired loans 160,151 Appraisal value Property specific adjustment N/A N/A Loan servicing rights 6,231 Discounted cash flows Constant prepayment rate 13.0 - 22.0% 16.4%
Fair Value, by Balance Sheet Grouping	Fair values for balance sheet instruments as of June 30, 2016 and September 30, 2015 , are as follows (in thousands): June 30, 2016 September 30, 2015 Level in Carrying Fair Value Carrying Fair Value Assets Cash and due from banks Level 1 $ 475,785 $ 475,785 $ 237,770 $ 237,770 Loans, net excluding fair valued loans and loans Level 3 7,364,988 7,337,738 6,139,444 6,120,262 Accrued interest receivable Level 2 43,547 43,547 44,077 44,077 Federal Home Loan Bank stock Level 2 48,799 48,799 35,745 35,745 Liabilities Deposits Level 2 $ 8,480,209 $ 8,479,066 $ 7,387,065 $ 7,385,894 FHLB advances and other borrowings Level 2 913,377 917,617 581,000 584,261 Securities sold under repurchase agreements Level 2 159,016 159,016 185,271 185,271 Accrued interest payable Level 2 5,387 5,387 4,006 4,006 Subordinated debentures and subordinated notes payable Level 2 111,827 113,083 90,727 91,305

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings per Share	The following information was used in the computation of basic earnings per share (EPS) for the three and nine months ended June 30, 2016 and 2015 (in thousands, except share data): Three Months Ended Nine Months Ended 2016 2015 2016 2015 Net income $ 26,360 $ 28,832 $ 87,495 $ 75,253 Weighted average common shares outstanding 57,012,698 57,898,335 55,845,322 57,897,484 Dilutive effect of stock based compensation 164,007 60,867 147,689 31,704 Weighted average common shares outstanding for diluted earnings per share calculation 57,176,705 57,959,202 55,993,011 57,929,188 Basic earnings per share $ 0.46 $ 0.50 $ 1.57 $ 1.30 Diluted earnings per share $ 0.46 $ 0.50 $ 1.56 $ 1.30

Nature of Operations and Summ49

Nature of Operations and Summary of Significant Policies (Details)	Jul. 28, 2016$ / shares	Jun. 30, 2016USD ($)$ / shares	Jun. 30, 2015USD ($)$ / shares	Jun. 30, 2016USD ($)portfolio_class$ / shares	Jun. 30, 2015USD ($)$ / shares	Dec. 31, 2010agreement	Mar. 31, 2016USD ($)	Sep. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Sep. 30, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity period of loans and loan commitments				5 years
Period for loans held for sale to be carried at cost and sold				45 days
Number of portfolio classes | portfolio_class				6
Nonperforming classification, payment history period				6 months
FDIC Indemnification, number of loss share agreements entered | agreement						2
FDIC Indemnification, expected reimbursement rate				80.00%
FDIC Clawback Liability, payment period following termination or maturity of agreement				45 days
Loan servicing rights valuation allowance | $		$ 176,000	$ 0	$ 176,000	$ 0		$ 0	$ 0	$ 0	$ 0
Goodwill impairment | $		0	0	0	0
Impairment of intangible assets | $		$ 0	$ 0	$ 0	$ 0
Subsequent Event [Line Items]
Common stock dividends declared (in dollars per share) | $ / shares		$ 0.14	$ 0.12	$ 0.42	$ 0.24
Brand intangible
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				15 years
Customer relationships
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				8 years 6 months
Residential loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC Indemnification, number of loss share agreements entered | agreement						1
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC Indemnification, number of loss share agreements entered | agreement						1
Subsequent event
Subsequent Event [Line Items]
Common stock dividends declared (in dollars per share) | $ / shares	$ 0.14
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity period of loans and loan commitments				5 years
Minimum | Core deposit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				5 years
Minimum | Other intangibles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				1 year 3 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity period of loans and loan commitments				15 years
Maximum | Core deposit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				10 years
Maximum | Other intangibles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Intangible asset, useful life				9 years 3 months 29 days

Acquisition Activity - Schedule

Acquisition Activity - Schedule of Consideration (Details) - USD ($) shares in Thousands, $ in Thousands	May 16, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Non-equity consideration:
Goodwill		$ 738,460	$ 697,807	$ 697,807
HF Financial Corporation
Equity consideration:
Common stock issued (in shares)	3,448,119
Common stock issued	$ 107,478
Non-equity consideration:
Cash	34,487
Total consideration paid	141,965
Fair value of net assets acquired including identifiable intangible assets	101,312
Goodwill	$ 40,653

Acquisition Activity - Schedu51

Acquisition Activity - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	May 16, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Liabilities assumed:
Goodwill		$ 738,460	$ 697,807	$ 697,807
HF Financial Corporation
Identifiable assets acquired:
Cash and due from banks	$ 18,818
Investment securities	165,052
Net loans	863,741
Premises and equipment	19,220
Accrued interest receivable	4,117
Other repossessed property	4
Intangible assets	7,877
Loan servicing rights	6,573
Other assets	36,639
Total identifiable assets acquired	1,122,041
Liabilities assumed:
Deposits	863,121
FHLB advances and other borrowings	115,881
Subordinated debentures	21,110
Other liabilities	20,617
Total liabilities assumed	1,020,729
Fair value of net identifiable assets acquired	101,312
Net purchase price	141,965
Goodwill	$ 40,653

Acquisition Activity - Schedu52

Acquisition Activity - Schedule of Pro Forma Information (Details) - HF Financial Corporation - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Net interest income	$ 125,539	$ 93,999	$ 316,922	$ 275,746
Net income	$ 35,245	$ 30,795	$ 99,927	$ 77,067
Basic earnings per share (in USD per share)	$ 0.62	$ 0.53	$ 1.79	$ 1.33
Fully diluted earnings per share (in USD per share)	$ 0.62	$ 0.53	$ 1.78	$ 1.33

Acquisition Activity - Schedu53

Acquisition Activity - Schedule of Total Contractually Required Principal and Interest (Details) - USD ($) $ in Thousands	Jun. 30, 2016	May 16, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Accretable yield	$ (40,976)		$ (39,843)	$ (44,489)	$ (46,889)	$ (43,431)	$ (50,889)
HF Financial Corporation | Receivables acquired with deteriorated credit quality
Business Acquisition [Line Items]
Contractually required principal and interest		$ 83,710
Non-accretable difference		(28,516)
Cash flows expected to be collected		55,194
Accretable yield		(3,662)
Total purchased credit impaired loans acquired		$ 51,532

Acquisition Activity - Schedu54

Acquisition Activity - Schedule of Acquired Loans (Details) - HF Financial Corporation $ in Thousands	May 16, 2016USD ($)
Business Acquisition [Line Items]
Fair Value of Acquired Loans at Acquisition Date	$ 812,209
Gross Contractual Amounts Receivable at Acquisition Date	998,255
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	9,572
Receivables acquired with deteriorated credit quality
Business Acquisition [Line Items]
Fair Value of Acquired Loans at Acquisition Date	51,532
Gross Contractual Amounts Receivable at Acquisition Date	83,710
Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	$ 28,516

Acquisition Activity - Narrativ

Acquisition Activity - Narrative (Details) $ / shares in Units, $ in Thousands	May 16, 2016USD ($)bank$ / sharesshares	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)
Business Acquisition [Line Items]
Goodwill		$ 738,460		$ 738,460		$ 697,807	$ 697,807
Acquisition expenses		12,179	$ 0	12,950	$ 0
HF Financial Corporation
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Equity interest issued per share as part of merger (in shares) | shares	0.65
Consideration paid as part of merger (in USD per share) | $ / shares	$ 19.50
Percentage of outstanding shares exchanged for cash as part of merger	24.29%
Percentage of outstanding shares exchanged for common stock as part of merger	75.71%
Net purchase price	$ 141,965
Goodwill	$ 40,653
Number of bank locations acquired | bank	23
Goodwill expected to be tax deductible	$ 0
Intangible assets	7,877
Acquisition expenses		$ 12,200	$ 0	$ 12,900	$ 0
Net loans acquired	863,741
Acquired loans, estimated discount	$ 28,500
Acquired loans, percentage of estimated discount	3.30%
Receivables acquired with deteriorated credit quality | HF Financial Corporation
Business Acquisition [Line Items]
Net loans acquired	$ 65,400

Securities Available for Sale -

Securities Available for Sale - (Narrative) (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2016USD ($)security	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)security	Jun. 30, 2015USD ($)	Sep. 30, 2015USD ($)security
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities available for sale	$ 120,900,000	$ 0	$ 145,934,000	$ 55,149,000
Available-for-sale securities, gross realized gains	100,000	0	200,000	600,000
Available-for-sale securities, gross realized losses	0	0	0	500,000
Other than temporary impairment losses recognized in earnings	$ 0	$ 0	$ 400,000	$ 0
Number of securities written off | security	2		2
Securities pledged as collateral	$ 1,080,000,000		$ 1,080,000,000		$ 894,300,000
Percentage of investment portfolio in continuous loss position	15.00%		15.00%		36.00%
Number of securities in an unrealized loss position (securities) | security	30		30		31
Federal home loan bank stock	$ 48,800,000		$ 48,800,000		$ 35,700,000

Securities Available for Sale

Securities Available for Sale - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	$ 1,346,582	$ 1,323,573
Gross Unrealized Gains	15,998	8,483
Gross Unrealized Losses	(1,416)	(4,729)
Estimated Fair Value	1,361,164	1,327,327
U.S. Treasury securities
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	226,751	250,986
Gross Unrealized Gains	5,246	3,811
Gross Unrealized Losses	0	0
Estimated Fair Value	231,997	254,797
U.S. Agency securities
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	49,641	74,412
Gross Unrealized Gains	366	643
Gross Unrealized Losses	0	0
Estimated Fair Value	50,007	75,055
Mortgage backed-securities, Issued by US Government | Government National Mortgage Association
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	705,180	842,460
Gross Unrealized Gains	5,786	3,663
Gross Unrealized Losses	(1,388)	(4,503)
Estimated Fair Value	709,578	841,620
Mortgage backed-securities, Issued by US Government | Federal National Mortgage Association
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	178,320	46,449
Gross Unrealized Gains	1,814	96
Gross Unrealized Losses	0	0
Estimated Fair Value	180,134	46,545
Mortgage backed-securities, Issued by US Government | Small Business Assistance Program
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	146,746	101,415
Gross Unrealized Gains	2,550	233
Gross Unrealized Losses	0	(213)
Estimated Fair Value	149,296	101,435
States and political subdivision securities
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	33,934	1,849
Gross Unrealized Gains	192	1
Gross Unrealized Losses	(28)	0
Estimated Fair Value	34,098	1,850
Corporate debt securities
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	4,997	4,996
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(13)
Estimated Fair Value	4,999	4,983
Other
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Amortized Cost	1,013	1,006
Gross Unrealized Gains	42	36
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 1,055	$ 1,042

Securities Available for Sale58

Securities Available for Sale - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Amortized Cost
Due in one year or less	$ 53,129	$ 76,261
Due after one year through five years	254,775	255,982
Due after five years through ten years	7,297	0
Due after ten years	122	0
Amortized Cost	315,323	332,243
Estimated Fair Value
Due in one year or less	53,503	76,905
Due after one year through five years	260,136	259,780
Due after five years through ten years	7,340	0
Due after ten years	122	0
Fair Value	321,101	336,685
Amortized Cost	1,346,582	1,323,573
Estimated Fair Value	1,361,164	1,327,327
Securities without contractual maturities, Amortized Cost	1,013	1,006
Securities without contractual maturities, Fair Value	1,055	1,042
Mortgage-backed securities
Estimated Fair Value
Amortized Cost	1,030,246	990,324
Estimated Fair Value	$ 1,039,008	$ 989,600

Securities Available for Sale59

Securities Available for Sale - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Estimated Fair Value	$ 4,494	$ 63,588
12 months or more, Estimated Fair Value	199,274	412,058
Fair Value	203,768	475,646
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Unrealized Losses	(29)	(249)
12 months or more, Unrealized Losses	(1,387)	(4,480)
Unrealized Losses	(1,416)	(4,729)
Mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Estimated Fair Value	101	58,604
12 months or more, Estimated Fair Value	199,274	412,058
Fair Value	199,375	470,662
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Unrealized Losses	(1)	(236)
12 months or more, Unrealized Losses	(1,387)	(4,480)
Unrealized Losses	(1,388)	(4,716)
Corporate debt securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Estimated Fair Value	0	4,984
12 months or more, Estimated Fair Value	0	0
Fair Value	0	4,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Unrealized Losses	0	(13)
12 months or more, Unrealized Losses	0	0
Unrealized Losses	0	(13)
States and political subdivision securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Estimated Fair Value	4,393	0
12 months or more, Estimated Fair Value	0	0
Fair Value	4,393	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, Unrealized Losses	(28)	0
12 months or more, Unrealized Losses	0	0
Unrealized Losses	$ (28)	$ 0

Securities Available for Sale60

Securities Available for Sale - Unrealized Gain (Loss) On Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Net change in unrealized gain on securities after taxes	$ 4,322	$ (3,845)	$ 6,713	$ 4,423
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Beginning balance accumulated other comprehensive income (loss)	4,709	2,111	2,318	(6,157)
Net unrealized holding gain arising during the period	6,837	(6,099)	11,024	7,186
Reclassification adjustment for net gain (loss) realized in net income	134	0	(196)	(51)
Net change in unrealized gain before income taxes	6,971	(6,099)	10,828	7,135
Income tax (expense)	(2,649)	2,254	(4,115)	(2,712)
Net change in unrealized gain on securities after taxes	4,322	(3,845)	6,713	4,423
Ending balance accumulated other comprehensive income	$ 9,031	$ (1,734)	$ 9,031	$ (1,734)

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans covered by FDIC loss share agreements	$ 80,137,000		$ 80,137,000		$ 97,030,000
Loans held for sale	21,301,000		21,301,000		9,867,000
Loans and written loan commitments at fair value under the fair value option	1,156,442,000		1,156,442,000		1,118,687,000
Unamortized discount on acquired loans	7,700,000		7,700,000		7,500,000
Loans in process	5,000,000		5,000,000		(700,000)
Loans guaranteed by U.S. Government Agencies	7,313,942,000		7,313,942,000		6,098,475,000
Principal balances of residential real estate loans sold	64,200,000	$ 79,500,000	172,800,000	$ 213,400,000
Valuation adjustments made to repossessed properties	500,000	1,200,000	1,000,000	$ 5,600,000
Specific reserves included in the allowance for loan losses for TDRs	10,000,000		10,000,000		3,600,000
Troubled debt restructuring, commitments to lend additional funds	200,000		200,000		2,300,000
Transfers out of troubled debt restructuring status	17,900,000	$ 0
Loans Guaranteed by US Government Authorities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans guaranteed by U.S. Government Agencies	$ 128,000,000		$ 128,000,000		$ 105,000,000

Loans - Schedule of Financing R

Loans - Schedule of Financing Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	$ 8,662,495	$ 7,351,288
Unamortized discount on acquired loans	(42,793)	(19,264)
Unearned net deferred fees and costs and loans in process	(12,728)	(6,826)
Net loans	8,606,974	7,325,198
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	1,032,355	921,827
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	3,657,024	2,845,748
Commercial non real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	1,746,257	1,610,828
Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	2,101,601	1,861,465
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	79,814	73,049
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total financing receivables, gross	$ 45,444	$ 38,371

Loans - Composition of the Loan

Loans - Composition of the Loan Portfolio by Internal Risk Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	$ 90,287	$ 56,155
Total financing receivables	7,383,120	6,116,307
Loans covered by FDIC loss share agreements	80,137	97,030
Total	7,463,257	6,213,337
Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	6,748,836	5,620,818
Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	395,893	310,378
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	237,610	183,643
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	781	1,468
Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	5,834	7,642
Total financing receivables	937,523	816,449
Loans covered by FDIC loss share agreements	80,137	97,030
Total	1,017,660	913,479
Residential real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	921,503	799,359
Residential real estate | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	5,212	4,890
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	10,705	11,877
Residential real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	103	323
Residential real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	10,331	9,556
Total financing receivables	3,298,954	2,508,109
Loans covered by FDIC loss share agreements	0	0
Total	3,298,954	2,508,109
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	3,128,241	2,384,980
Commercial real estate | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	108,694	66,024
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	61,864	56,905
Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	155	200
Commercial real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Commercial non real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	11,678	14,281
Total financing receivables	1,248,378	1,164,816
Loans covered by FDIC loss share agreements	0	0
Total	1,248,378	1,164,816
Commercial non real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	1,148,620	1,053,091
Commercial non real estate | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	69,731	50,242
Commercial non real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	29,504	60,801
Commercial non real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	523	682
Commercial non real estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Agriculture
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	62,356	24,569
Total financing receivables	1,773,821	1,515,549
Loans covered by FDIC loss share agreements	0	0
Total	1,773,821	1,515,549
Agriculture | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	1,426,550	1,272,312
Agriculture | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	212,049	189,144
Agriculture | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	135,222	53,837
Agriculture | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	256
Agriculture | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans, excluding loans covered under FDIC loss-sharing arrangements	88	107
Total financing receivables	79,000	73,013
Loans covered by FDIC loss share agreements	0	0
Total	79,000	73,013
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	78,478	72,705
Consumer | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	207	78
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	315	223
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	7
Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Other
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	45,444	38,371
Loans covered by FDIC loss share agreements	0	0
Total	45,444	38,371
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	45,444	38,371
Other | Watchlist
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Other | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Other | Loss
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	$ 0	$ 0

Loans - Past Due Loans (Details

Loans - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	$ 7,383,120	$ 6,116,307
Loans covered by FDIC loss sharing agreements	80,137	97,030
Total	7,463,257	6,213,337
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	937,523	816,449
Loans covered by FDIC loss sharing agreements	80,137	97,030
Total	1,017,660	913,479
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	3,298,954	2,508,109
Loans covered by FDIC loss sharing agreements	0	0
Total	3,298,954	2,508,109
Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,248,378	1,164,816
Loans covered by FDIC loss sharing agreements	0	0
Total	1,248,378	1,164,816
Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,773,821	1,515,549
Loans covered by FDIC loss sharing agreements	0	0
Total	1,773,821	1,515,549
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	79,000	73,013
Loans covered by FDIC loss sharing agreements	0	0
Total	79,000	73,013
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	45,444	38,371
Loans covered by FDIC loss sharing agreements	0	0
Total	45,444	38,371
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	7,347,456	6,083,438
Loans covered by FDIC loss sharing agreements	78,532	93,108
Total	7,425,988	6,176,546
Current | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	934,005	812,329
Current | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	3,293,255	2,500,950
Current | Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,239,171	1,152,103
Current | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,756,771	1,506,949
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	78,810	72,736
Current | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	45,444	38,371
Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	35,664	32,869
Loans covered by FDIC loss sharing agreements	1,605	3,922
Total	37,269	36,791
Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	3,518	4,120
Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	5,699	7,159
Past Due | Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	9,207	12,713
Past Due | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	17,050	8,600
Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	190	277
Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	0	0
Past Due | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	5,966	5,284
Loans covered by FDIC loss sharing agreements	849	2,455
Total	6,815	7,739
Past Due | 30-59 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,242	486
Past Due | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	42	1,708
Past Due | 30-59 Days Past Due | Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	182	697
Past Due | 30-59 Days Past Due | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	4,343	2,161
Past Due | 30-59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	157	232
Past Due | 30-59 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	0	0
Past Due | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	9,535	10,189
Loans covered by FDIC loss sharing agreements	496	594
Total	10,031	10,783
Past Due | 60-89 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	877	858
Past Due | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	224	1,204
Past Due | 60-89 Days Past Due | Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	436	7,944
Past Due | 60-89 Days Past Due | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	7,972	175
Past Due | 60-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	26	8
Past Due | 60-89 Days Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	0	0
Past Due | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	20,163	17,396
Loans covered by FDIC loss sharing agreements	260	873
Total	20,423	18,269
Past Due | 90 Days or Greater Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	1,399	2,776
Past Due | 90 Days or Greater Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	5,433	4,247
Past Due | 90 Days or Greater Past Due | Commercial non real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	8,589	4,072
Past Due | 90 Days or Greater Past Due | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	4,735	6,264
Past Due | 90 Days or Greater Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	7	37
Past Due | 90 Days or Greater Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables, net of unamortized discount on acquired loans	$ 0	$ 0

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 247,200		$ 247,200		$ 199,933
Unpaid Principal Balance	253,856		253,856		214,029
Related Allowance	27,650		27,650		17,085
Average Recorded Investment	246,397	$ 182,426	234,781	$ 172,467
Interest Income Recognized while on Impaired Status	10,190	7,123	20,961	19,743
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,983		10,983		12,364
Unpaid Principal Balance	11,942		11,942		12,602
Related Allowance	3,173		3,173		2,784
Average Recorded Investment	11,743	12,413	11,899	12,336
Interest Income Recognized while on Impaired Status	438	453	877	1,398
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	69,602		69,602		67,751
Unpaid Principal Balance	70,665		70,665		69,722
Related Allowance	7,602		7,602		4,644
Average Recorded Investment	78,962	75,665	76,159	72,287
Interest Income Recognized while on Impaired Status	3,193	3,106	6,666	9,498
Commercial non real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	31,066		31,066		65,495
Unpaid Principal Balance	33,260		33,260		76,647
Related Allowance	5,045		5,045		5,657
Average Recorded Investment	37,322	49,705	44,365	45,409
Interest Income Recognized while on Impaired Status	1,162	2,308	2,284	5,753
Agriculture
Financing Receivable, Impaired [Line Items]
Recorded Investment	135,222		135,222		54,093
Unpaid Principal Balance	137,479		137,479		54,699
Related Allowance	11,761		11,761		3,950
Average Recorded Investment	118,056	44,405	102,065	42,186
Interest Income Recognized while on Impaired Status	5,359	1,232	11,054	3,019
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	327		327		230
Unpaid Principal Balance	510		510		359
Related Allowance	69		69		$ 50
Average Recorded Investment	314	238	293	249
Interest Income Recognized while on Impaired Status	$ 38	$ 24	$ 80	$ 75

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructurings on Accruing and Nonaccrual Financing Receivables (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Sep. 30, 2015USD ($)
Accruing
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 45,161		$ 45,161		$ 60,371
Financing receivable, modifications, number of contracts | contract	5	3	33	20
Financing receivable, modifications, pre-modification recorded investment	$ 977	$ 627	$ 41,518	$ 28,584
Financing receivable, modifications, post-modification recorded investment	$ 977	$ 627	$ 41,518	$ 28,494
Change in recorded investment due to principal paydown at time of modification, number of contracts | contract	0	0	0	0
Change in recorded investment due to principal paydown at time of modification, pre-modification	$ 0	$ 0	$ 0	$ 0
Change in recorded investment due to principal paydown at time of modification, post-modification	$ 0	$ 0	$ 0	$ 0
Change in recorded investment due to chargeoffs at time of modification, number of contracts | contract	0	0	0	1
Change in recorded investment due to chargeoffs at time of modification, pre-modification	$ 0	$ 0	$ 0	$ 90
Change in recorded investment due to chargeoffs at time of modification, post-modification	0	$ 0	0	$ 0
Accruing | Residential real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 413		$ 413		452
Financing receivable, modifications, number of contracts | contract	1	1	1	3
Financing receivable, modifications, pre-modification recorded investment	$ 42	$ 35	$ 42	$ 71
Financing receivable, modifications, post-modification recorded investment	42	$ 35	42	$ 71
Accruing | Commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 17,851		$ 17,851		30,917
Financing receivable, modifications, number of contracts | contract	0	1	5	9
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 574	$ 8,612	$ 23,704
Financing receivable, modifications, post-modification recorded investment	0	$ 574	8,612	$ 23,614
Accruing | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 7,255		$ 7,255		8,928
Financing receivable, modifications, number of contracts | contract	4	0	10	6
Financing receivable, modifications, pre-modification recorded investment	$ 935	$ 0	$ 4,961	$ 4,785
Financing receivable, modifications, post-modification recorded investment	935	$ 0	4,961	$ 4,785
Accruing | Agriculture
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 19,610		$ 19,610		20,041
Financing receivable, modifications, number of contracts | contract	0	0	17	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 27,903	$ 0
Financing receivable, modifications, post-modification recorded investment	0	$ 0	27,903	$ 0
Accruing | Consumer
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 32		$ 32		33
Financing receivable, modifications, number of contracts | contract	0	1	0	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 18	$ 0	$ 24
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 18	$ 0	$ 24
Accruing | Rate modification | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 15
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 15
Accruing | Rate modification | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Rate modification | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	1	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 49	$ 32
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 49	$ 32
Accruing | Rate modification | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Rate modification | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Term extension | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	1	1	1
Financing receivable, modifications, pre-modification recorded investment	$ 42	$ 35	$ 42	$ 35
Financing receivable, modifications, post-modification recorded investment	$ 42	$ 35	$ 42	$ 35
Accruing | Term extension | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	2	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 574	$ 1,898	$ 664
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 574	$ 1,898	$ 574
Accruing | Term extension | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	3	0	4	3
Financing receivable, modifications, pre-modification recorded investment	$ 57	$ 0	$ 115	$ 2,879
Financing receivable, modifications, post-modification recorded investment	$ 57	$ 0	$ 115	$ 2,879
Accruing | Term extension | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	13	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 26,914	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 26,914	$ 0
Accruing | Term extension | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Payment modification | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Payment modification | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	6
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 22,542
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 22,542
Accruing | Payment modification | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	0	2	2
Financing receivable, modifications, pre-modification recorded investment	$ 878	$ 0	$ 948	$ 1,874
Financing receivable, modifications, post-modification recorded investment	$ 878	$ 0	$ 948	$ 1,874
Accruing | Payment modification | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	4	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 989	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 989	$ 0
Accruing | Payment modification | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 18	$ 0	$ 18
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 18	$ 0	$ 18
Accruing | Bankruptcy | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Bankruptcy | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 498
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 498
Accruing | Bankruptcy | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Bankruptcy | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Bankruptcy | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 6
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 6
Accruing | Other | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 21
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 21
Accruing | Other | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	3	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 6,714	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 6,714	$ 0
Accruing | Other | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	3	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 3,849	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 3,849	$ 0
Accruing | Other | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Accruing | Other | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	0	$ 0	0	$ 0
Nonaccrual
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 38,790		$ 38,790		13,966
Financing receivable, modifications, number of contracts | contract	7	6	11	15
Financing receivable, modifications, pre-modification recorded investment	$ 1,179	$ 126	$ 2,134	$ 568
Financing receivable, modifications, post-modification recorded investment	$ 1,132	$ 34	$ 2,087	$ 476
Change in recorded investment due to principal paydown at time of modification, number of contracts | contract	0	0	0	0
Change in recorded investment due to principal paydown at time of modification, pre-modification	$ 0	$ 0	$ 0	$ 0
Change in recorded investment due to principal paydown at time of modification, post-modification	$ 0	$ 0	$ 0	$ 0
Change in recorded investment due to chargeoffs at time of modification, number of contracts | contract	7	2	7	2
Change in recorded investment due to chargeoffs at time of modification, pre-modification	$ 47	$ 92	$ 47	$ 92
Change in recorded investment due to chargeoffs at time of modification, post-modification	0	$ 0	0	$ 0
Nonaccrual | Residential real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 1,090		$ 1,090		1,547
Financing receivable, modifications, number of contracts | contract	1	3	2	7
Financing receivable, modifications, pre-modification recorded investment	$ 50	$ 44	$ 237	$ 268
Financing receivable, modifications, post-modification recorded investment	49	$ 29	236	$ 253
Nonaccrual | Commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 3,429		$ 3,429		4,725
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	0	$ 0	0	$ 0
Nonaccrual | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 1,539		$ 1,539		833
Financing receivable, modifications, number of contracts | contract	0	2	2	6
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 81	$ 760	$ 298
Financing receivable, modifications, post-modification recorded investment	0	$ 4	760	$ 221
Nonaccrual | Agriculture
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 32,723		$ 32,723		6,857
Financing receivable, modifications, number of contracts | contract	6	0	6	0
Financing receivable, modifications, pre-modification recorded investment	$ 1,129	$ 0	$ 1,129	$ 0
Financing receivable, modifications, post-modification recorded investment	1,083	$ 0	1,083	$ 0
Nonaccrual | Consumer
Financing Receivable, Modifications [Line Items]
Recorded value of TDR balance	$ 9		$ 9		$ 4
Financing receivable, modifications, number of contracts | contract	0	1	1	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 1	$ 8	$ 2
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 1	$ 8	$ 2
Nonaccrual | Rate modification | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 104
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 104
Nonaccrual | Rate modification | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Rate modification | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Rate modification | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Rate modification | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Term extension | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 77
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 77
Nonaccrual | Term extension | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Term extension | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	5
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 77	$ 0	$ 294
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 217
Nonaccrual | Term extension | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	0	1	0
Financing receivable, modifications, pre-modification recorded investment	$ 101	$ 0	$ 101	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 100	$ 0	$ 100	$ 0
Nonaccrual | Term extension | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	2
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 1	$ 0	$ 2
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 1	$ 0	$ 2
Nonaccrual | Payment modification | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	1	2	1
Financing receivable, modifications, pre-modification recorded investment	$ 50	$ 19	$ 237	$ 19
Financing receivable, modifications, post-modification recorded investment	$ 49	$ 19	$ 236	$ 19
Nonaccrual | Payment modification | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Payment modification | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	2	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 4	$ 760	$ 4
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 4	$ 760	$ 4
Nonaccrual | Payment modification | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	4	0	4	0
Financing receivable, modifications, pre-modification recorded investment	$ 932	$ 0	$ 932	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 887	$ 0	$ 887	$ 0
Nonaccrual | Payment modification | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Bankruptcy | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 43
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 43
Nonaccrual | Bankruptcy | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Bankruptcy | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Bankruptcy | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Bankruptcy | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	1	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 8	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 8	$ 0
Nonaccrual | Other | Residential real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	1
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 25	$ 0	$ 25
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 10	$ 0	$ 10
Nonaccrual | Other | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Other | Commercial non real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual | Other | Agriculture
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	0	1	0
Financing receivable, modifications, pre-modification recorded investment	$ 96	$ 0	$ 96	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 96	$ 0	$ 96	$ 0
Nonaccrual | Other | Consumer
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Financing receivable, modifications, pre-modification recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, post-modification recorded investment	$ 0	$ 0	$ 0	$ 0

Loans - Subsequent Defaults on

Loans - Subsequent Defaults on Modified Loans (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	3	6	6	11
Recorded Investment | $	$ 1,035	$ 824	$ 1,035	$ 1,167
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	1	1	4
Recorded Investment | $	$ 0	$ 10	$ 0	$ 353
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Commercial non real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	2	2	2	4
Recorded Investment | $	$ 275	$ 32	$ 275	$ 32
Agriculture
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	1	3	3	3
Recorded Investment | $	$ 760	$ 782	$ 760	$ 782
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0

Allowance for Loan and Lease 68

Allowance for Loan and Lease Losses - (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and written loan commitments at fair value under the fair value option	$ 1,156,442		$ 1,156,442			$ 1,118,687
Loans held for sale	21,301		21,301			9,867
Loans guaranteed by U.S. Government Agencies	7,313,942		7,313,942			6,098,475
Allowance for loan leases	64,243	$ 55,930	64,243	$ 55,930	$ 61,917	57,200	$ 52,426	$ 47,518
Net reversal of provision	1,105	1,586	3,300	4,707
Unfunded loan commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	500		500			400
Receivables acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans guaranteed by U.S. Government Agencies	138,378		138,378			108,467
Allowance for loan leases	2,145		2,145			2,776
Net reversal of provision	400	$ 600	600	$ 1,200
Loans Guaranteed by US Government Authorities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans guaranteed by U.S. Government Agencies	$ 128,000		$ 128,000			$ 105,000

Allowance for Loan and Lease 69

Allowance for Loan and Lease Losses - Summary of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	$ 61,917	$ 52,426	$ 57,200	$ 47,518
Charge-offs	(4,151)	(2,492)	(8,149)	(13,703)
Recoveries	1,105	1,586	3,300	4,707
Provision	5,726	4,991	12,512	18,600
Allowance for loan losses, ending balance	64,243	55,930	64,243	55,930
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	8,796	7,495	8,025	8,342
Charge-offs	(257)	(77)	(959)	(197)
Recoveries	133	84	472	197
Provision	(778)	(325)	463	(515)
Allowance for loan losses, ending balance	7,689	6,552	7,689	6,552
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	20,904	15,736	18,014	16,884
Charge-offs	(291)	(280)	(1,063)	(1,932)
Recoveries	77	205	568	300
Provision	(713)	2,130	2,547	2,476
Allowance for loan losses, ending balance	19,828	17,836	19,828	17,836
Commercial non real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	12,631	15,957	15,996	10,550
Charge-offs	(1,936)	(1,337)	(2,193)	(9,861)
Recoveries	235	949	875	3,092
Provision	1,200	1,381	(2,478)	13,169
Allowance for loan losses, ending balance	12,130	16,950	12,130	16,950
Agriculture
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	18,323	12,222	13,952	10,655
Charge-offs	(1,133)	(411)	(2,257)	(438)
Recoveries	262	10	386	89
Provision	5,634	1,545	11,005	3,060
Allowance for loan losses, ending balance	23,086	13,366	23,086	13,366
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	336	189	348	264
Charge-offs	(37)	(31)	(183)	(88)
Recoveries	61	32	131	79
Provision	79	164	143	123
Allowance for loan losses, ending balance	439	353	439	353
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance	927	827	865	823
Charge-offs	(497)	(356)	(1,494)	(1,187)
Recoveries	337	306	868	950
Provision	304	96	832	287
Allowance for loan losses, ending balance	1,071	873	1,071	873
Receivables acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			2,776
Recoveries	400	600	600	1,200
(Improvement) impairment of ASC 310-30 loans	(354)	(581)	(620)	(1,192)
Allowance for loan losses, ending balance	2,145		2,145
Receivables acquired with deteriorated credit quality | Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			1,624
(Improvement) impairment of ASC 310-30 loans	(205)	(625)	(312)	(1,275)
Allowance for loan losses, ending balance	1,301		1,301
Receivables acquired with deteriorated credit quality | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			1,082
(Improvement) impairment of ASC 310-30 loans	(149)	45	(238)	108
Allowance for loan losses, ending balance	844		844
Receivables acquired with deteriorated credit quality | Commercial non real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			70
(Improvement) impairment of ASC 310-30 loans	0	0	(70)	0
Allowance for loan losses, ending balance	0		0
Receivables acquired with deteriorated credit quality | Agriculture
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			0
(Improvement) impairment of ASC 310-30 loans	0	0	0	0
Allowance for loan losses, ending balance	0		0
Receivables acquired with deteriorated credit quality | Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			0
(Improvement) impairment of ASC 310-30 loans	0	(1)	0	(25)
Allowance for loan losses, ending balance	0		0
Receivables acquired with deteriorated credit quality | Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses, beginning balance			0
(Improvement) impairment of ASC 310-30 loans	0	$ 0	0	$ 0
Allowance for loan losses, ending balance	$ 0		$ 0

Allowance for Loan and Lease 70

Allowance for Loan and Lease Losses - Summary of Allowance for Loan Losses by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Allowance for loan and lease losses
Individually evaluated for impairment	$ 27,610		$ 16,992
Collectively evaluated for impairment	34,488		37,432
Total allowance	64,243	$ 61,917	57,200	$ 55,930	$ 52,426	$ 47,518
Financing Receivables
Individually evaluated for impairment	188,592		169,504
Collectively evaluated for impairment	6,986,972		5,820,504
Loans Outstanding	7,313,942		6,098,475
Residential real estate
Allowance for loan and lease losses
Individually evaluated for impairment	3,172		2,783
Collectively evaluated for impairment	3,216		3,618
Total allowance	7,689	8,796	8,025	6,552	7,495	8,342
Financing Receivables
Individually evaluated for impairment	10,413		13,106
Collectively evaluated for impairment	914,322		806,912
Loans Outstanding	995,728		902,207
Commercial real estate
Allowance for loan and lease losses
Individually evaluated for impairment	7,570		4,585
Collectively evaluated for impairment	11,414		12,347
Total allowance	19,828	20,904	18,014	17,836	15,736	16,884
Financing Receivables
Individually evaluated for impairment	47,576		49,794
Collectively evaluated for impairment	3,132,124		2,385,636
Loans Outstanding	3,225,370		2,456,140
Commercial non real estate
Allowance for loan and lease losses
Individually evaluated for impairment	5,038		5,624
Collectively evaluated for impairment	7,092		10,302
Total allowance	12,130	12,631	15,996	16,950	15,957	10,550
Financing Receivables
Individually evaluated for impairment	29,681		62,158
Collectively evaluated for impairment	1,170,544		1,056,806
Loans Outstanding	1,204,816		1,121,723
Agriculture
Allowance for loan and lease losses
Individually evaluated for impairment	11,761		3,950
Collectively evaluated for impairment	11,325		10,002
Total allowance	23,086	18,323	13,952	13,366	12,222	10,655
Financing Receivables
Individually evaluated for impairment	100,641		44,253
Collectively evaluated for impairment	1,646,828		1,461,230
Loans Outstanding	1,763,584		1,507,021
Consumer
Allowance for loan and lease losses
Individually evaluated for impairment	69		50
Collectively evaluated for impairment	370		298
Total allowance	439	336	348	353	189	264
Financing Receivables
Individually evaluated for impairment	281		193
Collectively evaluated for impairment	77,710		71,549
Loans Outstanding	79,000		73,013
Other
Allowance for loan and lease losses
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,071		865
Total allowance	1,071	$ 927	865	$ 873	$ 827	$ 823
Financing Receivables
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	45,444		38,371
Loans Outstanding	45,444		38,371
Receivables acquired with deteriorated credit quality
Allowance for loan and lease losses
Total allowance	2,145		2,776
Financing Receivables
Loans Outstanding	138,378		108,467
Receivables acquired with deteriorated credit quality | Residential real estate
Allowance for loan and lease losses
Total allowance	1,301		1,624
Financing Receivables
Loans Outstanding	70,993		82,189
Receivables acquired with deteriorated credit quality | Commercial real estate
Allowance for loan and lease losses
Total allowance	844		1,082
Financing Receivables
Loans Outstanding	45,670		20,710
Receivables acquired with deteriorated credit quality | Commercial non real estate
Allowance for loan and lease losses
Total allowance	0		70
Financing Receivables
Loans Outstanding	4,591		2,759
Receivables acquired with deteriorated credit quality | Agriculture
Allowance for loan and lease losses
Total allowance	0		0
Financing Receivables
Loans Outstanding	16,115		1,538
Receivables acquired with deteriorated credit quality | Consumer
Allowance for loan and lease losses
Total allowance	0		0
Financing Receivables
Loans Outstanding	1,009		1,271
Receivables acquired with deteriorated credit quality | Other
Allowance for loan and lease losses
Total allowance	0		0
Financing Receivables
Loans Outstanding	$ 0		$ 0

Accounting for Certain Loans 71

Accounting for Certain Loans Acquired with Deteriorated Credit Quality - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Receivables [Abstract]
Allowance recognized on previous impairments	$ 0.4	$ 0.9	$ 0.6	$ 1.9

Accounting for Certain Loans 72

Accounting for Certain Loans Acquired with Deteriorated Credit Quality - Schedule of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 39,843	$ 43,431	$ 44,489	$ 50,889
Acquisition	3,662	0	3,662	0
Accretion	(2,529)	(3,240)	(7,119)	(11,249)
Reclassification from (to) nonaccretable difference	0	7,736	(56)	8,367
Disposals	0	(1,038)	0	(1,118)
Balance at end of period	$ 40,976	$ 46,889	$ 40,976	$ 46,889

Accounting for Certain Loans 73

Accounting for Certain Loans Acquired with Deteriorated Credit Quality - Schedule of Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 247,972	$ 204,574
Recorded Investment	138,378	108,467
Carrying Value	136,233	105,691
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	83,624	93,979
Recorded Investment	70,993	82,189
Carrying Value	69,692	80,565
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	131,309	97,302
Recorded Investment	45,670	20,710
Carrying Value	44,826	19,628
Commercial non real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	11,819	10,387
Recorded Investment	4,591	2,759
Carrying Value	4,591	2,689
Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	20,042	1,538
Recorded Investment	16,115	1,538
Carrying Value	16,115	1,538
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	1,178	1,368
Recorded Investment	1,009	1,271
Carrying Value	$ 1,009	$ 1,271

FDIC Indemnification Asset - Sc

FDIC Indemnification Asset - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$ 12,875	$ 19,895	$ 14,722	$ 26,678
Amortization	(959)	(1,754)	(2,886)	(6,347)
Changes in expected reimbursements from FDIC for changes in expected credit losses	(14)	15	(141)	(175)
Changes in reimbursable expenses	(268)	(1,148)	(695)	(1,511)
Payments (reimbursements) of covered losses from the FDIC	72	(29)	706	(1,666)
Balance at end of period	$ 11,706	$ 16,979	$ 11,706	$ 16,979

Derivative Financial Instrume75

Derivative Financial Instruments - Notional Amounts and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Derivative [Line Items]
Positive Fair Value	$ 0	$ 41
Negative Fair Value	(91,066)	(53,559)
Termination value of net liability position	93,400
Collateral posted, amount	101,600
Not Designated as Hedging Instruments | Liabilities | Interest rate swaps
Derivative [Line Items]
Notional Amount	1,071,795	1,087,505
Positive Fair Value	0	41
Negative Fair Value	(91,066)	(53,559)
Not Designated as Hedging Instruments | Liabilities | Mortgage loan forward sale contracts
Derivative [Line Items]
Notional Amount	75,195	36,655
Positive Fair Value	0	0
Negative Fair Value	(253)	(95)
Not Designated as Hedging Instruments | Assets | Mortgage loan commitments
Derivative [Line Items]
Notional Amount	57,704	30,196
Positive Fair Value	253	95
Negative Fair Value	$ 0	$ 0

Derivative Financial Instrume76

Derivative Financial Instruments - Effect on the Consolidated Statement of Comprehensive Income (Details) - Noninterest income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest rate swaps
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (21,925)	$ 18,946	$ (53,379)	$ (27,357)
Mortgage loan commitments
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	201	(26)	253	1
Mortgage loan forward sale contracts
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (201)	$ 26	$ (253)	$ (1)

Derivative Financial Instrume77

Derivative Financial Instruments - Offsetting Liabilities and Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative financial assets, gross amount	$ 0	$ 41
Derivative financial liabilities, gross amount	(91,066)	(53,559)
Derivative financial assets (liabilities), gross amount	(91,066)	(53,518)
Derivative financial assets, amount offset	0	(41)
Derivative financial liabilities, amount offset	0	41
Derivative financial assets (liabilities), Net, amount offset	0	0
Derivative financial assets, net amount presented in Consolidated Balance Sheets	0	0
Derivative financial liabilities, net amount presented in Consolidated Balance Sheets	(91,066)	(53,518)
Derivative financial assets (liabilities), net amount presented in Consolidated Balance Sheets	(91,066)	(53,518)
Derivative financial assets, Held/pledged financial instruments	0	0
Derivative financial liabilities, Held/pledged financial instruments	91,066	53,518
Derivative liabilities (assets), Net, Held/pledged financial instruments	91,066	53,518
Derivative financial asset, net amount	0	0
Derivative financial liabilities, net amount	0	0
Derivative financial assets (liabilities), net, amount offset against collateral	$ 0	$ 0

The Fair Value Option For Cer78

The Fair Value Option For Certain Loans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Eligible item for the fair value option			$ 83		$ 47.8
Loans greater than 90 days past due or in nonaccrual status	$ 9		9		1.5
Unpaid principal balance greater than 90 days past due or in nonaccrual status	11		11		1.7
Long-term loans and written loan commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Eligible item for the fair value option	2.7	$ 0	2.3	$ 0.5
Fair value, option, aggregate differences, long-term debt instruments	$ 1,070		$ 1,070		$ 1,070

The Fair Value Option For Cer79

The Fair Value Option For Certain Loans - Schedule of Fair Value Option (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of loans	$ 14,198	$ (24,394)	$ 35,253	$ 7,914
Long-term loans and written loan commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of loans	14,197	(24,394)	35,252	7,914
Noninterest Income | Long-term loans and written loan commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of loans	$ 14,197	$ (24,394)	$ 35,252	$ 7,914

Goodwill - Summary of Changes t

Goodwill - Summary of Changes to Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Goodwill [Roll Forward]
Balance, beginning of period	$ 697,807	$ 697,807
Goodwill acquired during the period	40,653	0
Balance, end of period	$ 738,460	$ 697,807

Core Deposits and Other Intan81

Core Deposits and Other Intangibles - Intangible Assets Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 125,109	$ 117,232
Accumulated amortization	(112,352)	(110,113)
Total	12,757	7,119
Core Deposit Intangible
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,018	92,679
Accumulated amortization	(92,455)	(92,073)
Total	7,563	606
Brand Intangible
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,464	8,464
Accumulated amortization	(4,559)	(4,136)
Total	3,905	4,328
Customer Relationships Intangible
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	16,089	16,089
Accumulated amortization	(15,326)	(13,904)
Total	763	2,185
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	538	0
Accumulated amortization	(12)	0
Total	$ 526	$ 0

Core Deposits and Other Intan82

Core Deposits and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of core deposits and other intangibles	$ 0.7	$ 1.8	$ 2.1	$ 6.4

Core Deposits and Other Intan83

Core Deposits and Other Intangibles - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining in 2016	$ 1,024
2,017	2,342
2,018	1,614
2,019	1,489
2,020	1,363
2021 and thereafter	4,925
Total	$ 12,757	$ 7,119

Loan Servicing Rights - Schedul

Loan Servicing Rights - Schedule of Loan Servicing Rights Activity and Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Balance of loans serviced at:
Loan servicing rights, beginning of period	$ 0	$ 0	$ 0	$ 0
Acquired in HF Financial acquisition	6,573	0	6,573	0
Additions	0	0	0	0
Amortization	(166)	0	(166)	0
Loan servicing rights, end of period	6,407	0	6,407	0
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance, beginning of period	0	0	0	0
Additions / (reductions)	(176)	0	(176)	0
Valuation allowance, end of period	(176)	0	(176)	0
Loan servicing rights, net	6,231	0	6,231	0	$ 0
Servicing fees received	306	0	306	0
Balance of loans serviced at:
Beginning of period	0	0	0	0
End of period	$ 914,694	$ 0	$ 914,694	$ 0
Constant prepayment rates			16.40%
Discount rate			11.60%

Securities Sold Under Agreeme85

Securities Sold Under Agreements to Repurchase - (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 161.8	$ 180.6
Securities sold under agreements to repurchase, fair value of collateral	$ 163	$ 181.6
Securities sold under agreements to repurchase, collateral, percentage of borrowed funds	102.00%

Securities Sold Under Agreeme86

Securities Sold Under Agreements to Repurchase - Maturity Schedule of Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	$ 159,016	$ 185,271
States and political subdivision securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	64,252
Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	159,016	121,019
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	156,072	182,399
Overnight and Continuous | States and political subdivision securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	64,252
Overnight and Continuous | Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	156,072	118,147
Up to 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
Up to 30 days | States and political subdivision securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
Up to 30 days | Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
30 to 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
30 to 90 Days | States and political subdivision securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
30 to 90 Days | Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	2,944	2,872
Greater than 90 days | States and political subdivision securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	0	0
Greater than 90 days | Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Total repurchase agreements	$ 2,944	$ 2,872

FHLB Advances and Other Borro87

FHLB Advances and Other Borrowings - (Narrative) (Details) - USD ($)	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Current borrowing capacity	$ 684,700,000
Loans pledged to the Federal Home Loan Bank	3,110,000,000	$ 2,290,000,000
Wells Fargo | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity	$ 10,000,000
Unused capacity fee, percentage	0.20%
Interest rate at end of period	2.47%
Outstanding advances	$ 0	$ 0
London Interbank Offered Rate (LIBOR) | Wells Fargo | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%

FHLB Advances and Other Borro88

FHLB Advances and Other Borrowings - Schedule of Advances, Related Party Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Other	$ 173	$ 0
Total	913,328	581,000
Fair value adjustment	49	0
Total FHLB advances and other borrowings	913,377	581,000
Notes payable to banks
Debt Instrument [Line Items]
Federal Home Loan Bank (FHLB) notes payable and fed funds advance	$ 520,000	$ 581,000
Notes payable to banks | Minimum
Debt Instrument [Line Items]
Stated interest rate, percentage	0.43%	0.43%
Notes payable to banks | Maximum
Debt Instrument [Line Items]
Stated interest rate, percentage	3.66%	3.66%
Federal Home Loan Bank fed funds advance
Debt Instrument [Line Items]
Federal Home Loan Bank (FHLB) notes payable and fed funds advance	$ 393,155	$ 0
Federal Home Loan Bank fed funds advance | Minimum
Debt Instrument [Line Items]
Interest rate, percentage	0.42%
Federal Home Loan Bank fed funds advance | Maximum
Debt Instrument [Line Items]
Interest rate, percentage	0.52%

FHLB Advances and Other Borro89

FHLB Advances and Other Borrowings - Schedule of Due or Callable Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Total	$ 111,827	$ 90,727
FHLB Advances and Related Party Notes Payable
Debt Instrument [Line Items]
Remaining in 2016	393,328
2,017	29,000
2,018	31,000
2,019	0
2,020	0
2021 and thereafter	460,000
Total	$ 913,328

Subordinated Debentures and S90

Subordinated Debentures and Subordinated Notes Payable - Summary of Subordinated Debentures and Notes Payable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Total subordinated debentures and subordinated notes payable	$ 111,827	$ 90,727
Junior Subordinated Debt
Debt Instrument [Line Items]
Total junior subordinated debentures payable	80,920	56,083
Common Shares Held in Other Assets	2,520	1,683
Less: fair value adjustment	(3,792)	0
Total subordinated debentures and subordinated notes payable	77,128	56,083
Junior Subordinated Debt | GW Statutory Trust IV, variable rate of 2.85%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	23,093	23,093
Common Shares Held in Other Assets	$ 693	$ 693
Basis spread on variable rate	2.85%	2.85%
Junior Subordinated Debt | GW Statutory Trust VI, variable rate of 1.48%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 30,928	$ 30,928
Common Shares Held in Other Assets	$ 928	$ 928
Basis spread on variable rate	1.48%	1.48%
Junior Subordinated Debt | SSB Trust II, variable rate of 1.85%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 2,062	$ 2,062
Common Shares Held in Other Assets	$ 62	$ 62
Basis spread on variable rate	1.85%	1.85%
Junior Subordinated Debt | HFB Trust III, variable rate of 3.35%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 5,155	$ 0
Common Shares Held in Other Assets	$ 155	$ 0
Basis spread on variable rate	3.35%	3.35%
Junior Subordinated Debt | HFB Trust IV, variable rate of 3.10%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 7,217	$ 0
Common Shares Held in Other Assets	$ 217	$ 0
Basis spread on variable rate	3.10%	3.10%
Junior Subordinated Debt | HFB Trust V, variable rate of 1.83%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 10,310	$ 0
Common Shares Held in Other Assets	$ 310	$ 0
Basis spread on variable rate	1.83%	1.83%
Junior Subordinated Debt | HFB Trust VI, variable rate of 1.65%, plus 3 month LIBOR
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 2,155	$ 0
Common Shares Held in Other Assets	$ 155	$ 0
Basis spread on variable rate	1.65%	1.65%
Subordinated Debt
Debt Instrument [Line Items]
Less: unamortized debt issuance costs	$ (301)	$ (356)
Total subordinated debentures and subordinated notes payable	34,699	$ 34,644
Stated interest rate, percentage		4.875%
Subordinated Debt | Fixed to floating rate, 4.875% per annum
Debt Instrument [Line Items]
Total junior subordinated debentures payable	$ 35,000	$ 35,000
Stated interest rate, percentage	4.875%	4.875%

Subordinated Debentures and S91

Subordinated Debentures and Subordinated Notes Payable - Narrative (Details)	9 Months Ended	12 Months Ended	60 Months Ended
	Jun. 30, 2016USD ($)trust$ / sharesshares	Sep. 30, 2015USD ($)	Aug. 15, 2025
Debt Instrument [Line Items]
Maximum interest payment deferral period	5 years
Total subordinated debentures and subordinated notes payable	$ 111,827,000	$ 90,727,000
Junior Subordinated Debt
Debt Instrument [Line Items]
Total subordinated debentures and subordinated notes payable	77,128,000	56,083,000
Common shares held in other assets	2,520,000	1,683,000
Subordinated Debt
Debt Instrument [Line Items]
Total subordinated debentures and subordinated notes payable	$ 34,699,000	34,644,000
Face amount of debt issued		$ 35,000,000
Stated interest rate, percentage		4.875%
Redemption price, percentage of principal		100.00%
Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Number of trusts | trust	7
Number of shares caused to be issued | shares	78,400
Par value per shares issued (in USD per share) | $ / shares	$ 1,000
Trust Preferred Securities Subject to Mandatory Redemption | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.48%
Trust Preferred Securities Subject to Mandatory Redemption | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	3.35%
Scenario, Forecast | Subordinated Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			3.15%

Profit-Sharing Plan and Defin92

Profit-Sharing Plan and Defined Benefit Plans - Profit Sharing Plan (Details) - Multiple employer 401(k) profit sharing plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, requisite service period			1 year
Defined contribution plan, minimum age requirement			21 years
Contributions by the Company	$ 1.2	$ 1.1	$ 3.2	$ 2.9

Profit-Sharing Plan and Defin93

Profit-Sharing Plan and Defined Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net periodic benefit cost
Service cost	$ 8	$ 0	$ 8	$ 0
Interest cost	109	0	109	0
Expected return on plan assets	(95)	0	(95)	0
Amortization of prior losses	0	0	0	0
Net periodic benefit cost	$ 22	$ 0	$ 22	$ 0

Stock-Based Compensation - (Nar

Stock-Based Compensation - (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period			3 years
Share-based compensation expense	$ 0.9	$ 0.3	$ 2.7	$ 1
Tax benefit from compensation expense	0.3	$ 0.1	$ 1	$ 0.4
Target performance level			100.00%
Share-based compensation, compensation cost not yet recognized	$ 4.9		$ 4.9
Share-based compensation, compensation cost not yet recognized, recognition period			2 years 5 months 1 day
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-established target levels			0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance level			150.00%
Pre-established target levels			150.00%
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares to be issued (approximately)			359,853
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested stock awards			$ 0.8

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Restricted and Performance Stock (Details) - $ / shares	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Restricted shares
Common Shares
Shares, beginning of fiscal year (shares)	80,446	0
Granted (shares)	113,543	81,419
Vested and issued (shares)	(25,729)	0
Forfeited (shares)	(3,137)	(973)
Canceled (shares)	0	0
Shares, end of period (shares)	165,123	80,446
Vested, but not issuable at end of period (shares)	24,480	12,221
Weighted-Average Grant Date Fair Value
Shares, beginning of fiscal year (in USD per share)	$ 18.18	$ 0
Granted (in USD per share)	30.95	18.18
Vested and issued (in USD per share)	18.11	0
Forfeited (in USD per share)	20.94	18
Canceled (in USD per share)	0	0
Shares, end of period (in USD per share)	26.92	18.18
Vested, but not issuable at end of period (in USD per share)	$ 26.14	$ 18
Performance shares
Common Shares
Shares, beginning of fiscal year (shares)	211,026	0
Granted (shares)	43,371	221,294
Vested and issued (shares)	(55)	0
Forfeited (shares)	(14,440)	(10,268)
Canceled (shares)	0	0
Shares, end of period (shares)	239,902	211,026
Weighted-Average Grant Date Fair Value
Shares, beginning of fiscal year (in USD per share)	$ 18	$ 0
Granted (in USD per share)	30.78	18
Vested and issued (in USD per share)	18	0
Forfeited (in USD per share)	18.36	18
Canceled (in USD per share)	0	0
Shares, end of period (in USD per share)	$ 20.29	$ 18

Fair Value Measurements - (Narr

Fair Value Measurements - (Narrative) (Details)	9 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Derivative, remaining maturity (or less)	180 days

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value Measurements of Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,361,164	$ 1,327,327
Derivatives-liabilities	91,319	53,613
Fair value loans and written loan commitments	1,156,442	1,118,687
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	231,997	254,797
U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	50,007	75,055
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,039,008	989,600
States and political subdivision securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	34,098	1,850
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,999	4,983
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,361,164	1,327,327
Derivatives-assets	253	95
Derivatives-liabilities	91,319	53,613
Fair value loans and written loan commitments	1,156,442	1,118,687
Cash value of life insurance	28,945	6,800
Fair value, measurements, recurring | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	231,997	254,797
Fair value, measurements, recurring | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	50,007	75,055
Fair value, measurements, recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,039,008	989,600
Fair value, measurements, recurring | States and political subdivision securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	34,098	1,850
Fair value, measurements, recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,999	4,983
Fair value, measurements, recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,055	1,042
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	282,004	329,852
Derivatives-assets		0
Derivatives-liabilities	0	0
Fair value loans and written loan commitments	0	0
Cash value of life insurance	0	0
Fair value, measurements, recurring | Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	231,997	254,797
Fair value, measurements, recurring | Level 1 | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	50,007	75,055
Fair value, measurements, recurring | Level 1 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 1 | States and political subdivision securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 1 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 1 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,077,845	995,640
Derivatives-assets	253	95
Derivatives-liabilities	91,319	53,613
Fair value loans and written loan commitments	1,156,442	1,118,687
Cash value of life insurance	28,945	6,800
Fair value, measurements, recurring | Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 2 | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 2 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,039,008	989,600
Fair value, measurements, recurring | Level 2 | States and political subdivision securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	32,783	15
Fair value, measurements, recurring | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,999	4,983
Fair value, measurements, recurring | Level 2 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,055	1,042
Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,315	1,835
Derivatives-assets	0	0
Derivatives-liabilities	0	0
Fair value loans and written loan commitments	0	0
Cash value of life insurance	0	0
Fair value, measurements, recurring | Level 3 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 3 | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 3 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 3 | States and political subdivision securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,315	1,835
Fair value, measurements, recurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Fair value, measurements, recurring | Level 3 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

Fair Value Measurements - Sch98

Fair Value Measurements - Schedule of Other Available-for-Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,458	$ 1,958	$ 1,835	$ 2,029
Additions	15	0	15	0
Principal paydown	(158)	(124)	(235)	(195)
Realized loss on securities	0	0	(300)	0
Ending Balance	$ 1,315	$ 1,834	$ 1,315	$ 1,834

Fair Value Measurements - Sch99

Fair Value Measurements - Schedule of Fair Value Measurement of Assets and Liabilities (Details) - Fair value, measurements, nonrecurring - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other real estate owned	$ 3,985	$ 8,826
Impaired loans	160,151	153,318
Loans held for sale, at lower of cost or fair value	21,301	9,867
Loan servicing rights	6,231	0
Level 1
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other real estate owned	0	0
Impaired loans	0	0
Loans held for sale, at lower of cost or fair value	0	0
Loan servicing rights	0	0
Level 2
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other real estate owned	0	0
Impaired loans	0	0
Loans held for sale, at lower of cost or fair value	21,301	9,867
Loan servicing rights	0	0
Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other real estate owned	3,985	8,826
Impaired loans	160,151	153,318
Loans held for sale, at lower of cost or fair value	0	0
Loan servicing rights	$ 6,231	$ 0

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Schedule (Details) - Fair value, measurements, nonrecurring - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	$ 3,985	$ 8,826
Impaired loans	160,151	153,318
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	3,985	8,826
Impaired loans	160,151	$ 153,318
Loan servicing rights	$ 6,231
Level 3 | Loan servicing rights | Discounted cash flows | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	13.00%
Fair Value Inputs, Discount Rate	9.50%
Level 3 | Loan servicing rights | Discounted cash flows | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	22.00%
Fair Value Inputs, Discount Rate	15.00%
Level 3 | Loan servicing rights | Discounted cash flows | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	16.40%
Fair Value Inputs, Discount Rate	11.60%

Fair Value Measurements - Sc101

Fair Value Measurements - Schedule of Balance Sheet Grouping Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Level 1 | Carrying Amount
Assets
Cash and due from banks	$ 475,785	$ 237,770
Level 1 | Fair Value
Assets
Cash and due from banks	475,785	237,770
Level 2 | Carrying Amount
Assets
Accrued interest receivable	43,547	44,077
Federal Home Loan Bank stock	48,799	35,745
Liabilities
Deposits	8,480,209	7,387,065
FHLB advances and other borrowings	913,377	581,000
Securities sold under repurchase agreements	159,016	185,271
Accrued interest payable	5,387	4,006
Subordinated debentures and subordinated notes payable	111,827	90,727
Level 2 | Fair Value
Assets
Accrued interest receivable	43,547	44,077
Federal Home Loan Bank stock	48,799	35,745
Liabilities
Deposits	8,479,066	7,385,894
FHLB advances and other borrowings	917,617	584,261
Securities sold under repurchase agreements	159,016	185,271
Accrued interest payable	5,387	4,006
Subordinated debentures and subordinated notes payable	113,083	91,305
Level 3 | Carrying Amount
Assets
Loans, net excluding fair valued loans and loans held for sale	7,364,988	6,139,444
Level 3 | Fair Value
Assets
Loans, net excluding fair valued loans and loans held for sale	$ 7,337,738	$ 6,120,262

Earnings per Share - Schedule o

Earnings per Share - Schedule of EPS, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 26,360	$ 28,832	$ 87,495	$ 75,253
Weighted average common shares outstanding (in shares)	57,012,698	57,898,335	55,845,322	57,897,484
Dilutive effect of stock based compensation (in shares)	164,007	60,867	147,689	31,704
Weighted average common shares outstanding for diluted earnings per share calculation (in shares)	57,176,705	57,959,202	55,993,011	57,929,188
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.50	$ 1.57	$ 1.30
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.50	$ 1.56	$ 1.30
Performance shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share			36,696	30,909
Stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of earnings per share			88,775	60,543