Investment Securities (Tables)

3 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale

The amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale and held to maturity as of December 31, 2016 and September 30, 2016, respectively, were as follows:

Available for sale securities	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
December 31, 2016
U.S. government agency obligations	$	15,695	$	4	$	620	$	15,079
Obligations of states and political subdivisions	32,808		13		674		32,147
Mortgage-backed securities	33,937		50		571		33,416
Federal Agricultural Mortgage Corporation	70		46		—		116
Trust preferred securities	378		—		—		378
Total available for sale securities	$	82,888	$	113	$	1,865	$	81,136
September 30, 2016
U.S. government agency obligations	$	16,388	$	48	$	29	$	16,407
Obligations of states and political subdivisions	33,405		630		23		34,012
Mortgage-backed securities	28,861		389		3		29,247
Federal Agricultural Mortgage Corporation	70		11		—		81
Trust preferred securities	376		$	—	$	—	376
Total available for sale securities	$	79,100	$	1,078	$	55	$	80,123

Held-to-maturity Securities

Held to maturity securities	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
December 31, 2016
Obligations of states and political subdivisions	$	1,314	$	7	$	1	$	1,320
Mortgage-backed securities	4,921		107		5		5,023
Total held to maturity securities	$	6,235	$	114	$	6	$	6,343
September 30, 2016
Obligations of states and political subdivisions	$	1,315	$	20	$	—	$	1,335
Mortgage-backed securities	5,354		255		—		5,609
Total held to maturity securities	$	6,669	$	275	$	—	$	6,944

	December 31, 2016				September 30, 2016
Held to maturity securities	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due after one year through five years	$	1,314	$	1,320	$	1,315	$	1,335
Due after five years through ten years	3,081		3,126		1,504		1,559
Due after ten years	1,840		1,897		3,850		4,050
Total held to maturity securities	$	6,235	$	6,343	$	6,669	$	6,944

Available-for-sale Securities

	December 31, 2016				September 30, 2016
Available for sale securities	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	230	$	230	$	230	$	230
Due after one year through five years	11,720		11,568		14,463		14,546
Due after five years through ten years	30,432		29,661		28,289		28,798
Due after ten years	40,506		39,677		36,118		36,549
Total available for sale securities	$	82,888	$	81,136	$	79,100	$	80,123