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