Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Interest and dividend income
Loans	$ 101,683	$ 87,197
Taxable securities	5,878	5,987
Nontaxable securities	199	12
Dividends on securities	300	213
Federal funds sold and other	346	75
Total interest and dividend income	108,406	93,484
Interest expense
Deposits	7,290	5,665
Securities sold under agreements to repurchase	115	139
FHLB advances and other borrowings	1,271	916
Subordinated debentures and subordinated notes payable	1,088	807
Total interest expense	9,764	7,527
Net interest income	98,642	85,957
Provision for loan and lease losses	7,049	3,889
Net interest income after provision for loan and lease losses	91,593	82,068
Noninterest income
Service charges and other fees	12,086	10,467
Wealth management fees	2,254	1,612
Mortgage banking income, net	2,662	1,270
Net gain (loss) on sale of securities	0	(354)
Net (decrease) in fair value of loans at fair value	(64,001)	(14,901)
Net realized and unrealized gain on derivatives	58,976	9,439
Other	1,930	1,111
Total noninterest income	13,907	8,644
Noninterest expense
Salaries and employee benefits	31,634	25,296
Data processing	5,677	5,246
Occupancy expenses	4,024	3,591
Professional fees	2,835	3,108
Communication expenses	1,040	934
Advertising	975	920
Equipment expense	798	904
Net loss (gain) recognized on repossessed property and other related expenses	658	(110)
Amortization of core deposits and other intangibles	839	709
Acquisition expenses	710	0
Other	3,347	3,622
Total noninterest expense	52,537	44,220
Income before income taxes	52,963	46,492
Provision for income taxes	16,060	16,031
Net income	36,903	30,461
Other comprehensive (loss) - change in net unrealized (loss) on securities available for sale (net of deferred income tax benefit of $8,158, and $4,662 for the three months ended December 31, 2016 and 2015, respectively)	(13,310)	(7,607)
Comprehensive income	$ 23,593	$ 22,854
Basic earnings per common share
Weighted average shares outstanding (in shares)	58,750,522	55,253,712
Earnings per share (in dollars per share)	$ 0.63	$ 0.55
Diluted earnings per common share
Weighted average shares outstanding (in shares)	58,991,905	55,393,452
Diluted earnings per share (in dollars per share)	$ 0.63	$ 0.55
Dividends per share
Dividends paid	$ 9,981	$ 7,733
Dividends per share (in dollars per share)	$ 0.17	$ 0.14