Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income
Loans	$ 107,680	$ 99,932
Taxable securities	6,494	5,878
Nontaxable securities	260	199
Dividends on securities	289	300
Federal funds sold and other	231	346
Total interest and dividend income	114,954	106,655
Interest expense
Deposits	10,998	7,290
Securities sold under agreements to repurchase	95	115
FHLB advances and other borrowings	2,069	1,271
Subordinated debentures and subordinated notes payable	1,170	1,088
Total interest expense	14,332	9,764
Net interest income	100,622	96,891
Provision for loan and lease losses	4,557	7,049
Net interest income after provision for loan and lease losses	96,065	89,842
Noninterest income
Service charges and other fees	13,178	13,837
Wealth management fees	2,185	2,254
Mortgage banking income, net	1,660	2,662
Net (loss) on sale of securities	(1)	0
Net (decrease) in fair value of loans at fair value	(8,665)	(64,001)
Net realized and unrealized gain on derivatives	7,227	58,976
Other	1,090	1,930
Total noninterest income	16,674	15,658
Noninterest expense
Salaries and employee benefits	32,868	31,634
Data processing	5,896	5,677
Occupancy expenses	4,002	4,024
Professional fees	4,240	2,835
Communication expenses	988	1,040
Advertising	1,059	975
Equipment expense	846	798
Net loss recognized on repossessed property and other related expenses	214	658
Amortization of core deposits and other intangibles	426	839
Acquisition expenses	0	710
Other	4,329	3,347
Total noninterest expense	54,868	52,537
Income before income taxes	57,871	52,963
Provision for income taxes	28,641	16,060
Net income	$ 29,230	$ 36,903
Basic earnings per common share
Weighted average shares outstanding (in shares)	58,902,629	58,750,522
Earnings per share (in dollars per share)	$ 0.50	$ 0.63
Diluted earnings per common share
Weighted average shares outstanding (in shares)	59,087,729	58,991,905
Diluted earnings per share (in dollars per share)	$ 0.49	$ 0.63
Dividends per share
Dividends paid	$ 11,770	$ 9,981
Dividends per share (in dollars per share)	$ 0.20	$ 0.17