Investment Securities (Tables)

6 Months Ended

Mar. 31, 2017

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale

The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands):

	March 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for Sale
Fannie Mae	$	120,437	$	244	$	(1,591	)	$	119,090
Freddie Mac		95,669		73		(1,136	)		94,606
Governmental National Mortgage Association		14,610		34		(218	)		14,426
Total mortgage-backed securities		230,716		351		(2,945	)		228,122
Obligations of states and political subdivisions		68,995		1,314		(974	)		69,335
U.S. government agency securities		23,344		119		—			23,463
Corporate obligations		45,315		203		(738	)		44,780
Other debt securities		29,980		122		(512	)		29,590
Total debt securities		398,350		2,109		(5,169	)		395,290
Equity securities - financial services		25		—		—			25
Total	$	398,375	$	2,109	$	(5,169	)	$	395,315

	September 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for Sale
Fannie Mae	$	115,535	$	1,891	$	(173	)	$	117,253
Freddie Mac		84,486		1,369		(85	)		85,770
Governmental National Mortgage Association		16,091		76		(28	)		16,139
Total mortgage-backed securities		216,112		3,336		(286	)		219,162
Obligations of states and political subdivisions		71,323		2,432		(65	)		73,690
U.S. government agency securities		25,669		272		—			25,941
Corporate obligations		38,331		599		(512	)		38,418
Other debt securities		32,962		428		(216	)		33,174
Total debt securities		384,397		7,067		(1,079	)		390,385
Equity securities - financial services		25		—		—			25
Total	$	384,422	$	7,067	$	(1,079	)	$	390,410

Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

The amortized cost and fair value of debt securities at March 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties (in thousands):

	Available For Sale
	Amortized Cost		Fair Value
Due in one year or less	$	15,986	$	16,013
Due after one year through five years		35,680		35,666
Due after five years through ten years		92,538		92,271
Due after ten years		254,146		251,340
Total	$	398,350	$	395,290

Schedule of Gross Unrealized Losses and Fair Value

The following table shows the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (dollars in thousands):

	March 31, 2017
	Number of Securities		Less than Twelve Months					Twelve Months or Greater					Total
			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Fannie Mae		61	$	76,418	$	(1,192	)	$	11,033	$	(399	)	$	87,451	$	(1,591	)
Freddie Mac		50		66,922		(909	)		6,701		(227	)		73,623		(1,136	)
Governmental National Mortgage Association		9		7,292		(181	)		2,373		(37	)		9,665		(218	)
Obligations of states and political subdivisions		29		34,982		(974	)		—		—			34,982		(974	)
Corporate obligations		23		18,850		(437	)		6,198		(301	)		25,048		(738	)
Other debt securities		18		12,303		(338	)		8,804		(174	)		21,107		(512	)
Total		190	$	216,767	$	(4,031	)	$	35,109	$	(1,138	)	$	251,876	$	(5,169	)

	September 30, 2016
	Number of Securities		Less than Twelve Months					Twelve Months or Greater					Total
			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Fannie Mae		17	$	6,841	$	(21	)	$	12,261	$	(152	)	$	19,102	$	(173	)
Freddie Mac		11		7,457		(11	)		6,375		(74	)		13,832		(85	)
Governmental National Mortgage Association		5		4,704		(16	)		1,267		(12	)		5,971		(28	)
Obligations of states and political subdivisions		12		14,420		(65	)		—		—			14,420		(65	)
Corporate obligations		12		8,778		(172	)		5,303		(340	)		14,081		(512	)
Other debt securities		13		6,582		(126	)		6,914		(90	)		13,496		(216	)
Total		70	$	48,782	$	(411	)	$	32,120	$	(668	)	$	80,902	$	(1,079	)