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Investment Securities (Tables)
 12 Months Ended
Sep. 30, 2018
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 September 30, 2018 and September 30, 2017, respectively, were as follows:
Available for sale securities
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
September 30, 2018
 
 
 
 
 
 
 
U.S. government agency obligations
$
35,880

 
$
3

 
$
1,280

 
$
34,603

Obligations of states and political subdivisions
35,348

 
2

 
796

 
34,554

Mortgage-backed securities
42,796

 
26

 
1,451

 
41,371

Agency securities
104

 
78

 
—

 
182

Corporate debt securities
6,593

 
—

 
317

 
6,276

Corporate asset based securities
1,494

 
2

 
—

 
1,496

Total available for sale securities
$
122,215

 
$
111

 
$
3,844

 
$
118,482

 
 
 
 
 
 
 
 
September 30, 2017
 
 
 
 
 
 
 
U.S. government agency obligations
$
18,454

 
$
35

 
$
448

 
$
18,041

Obligations of states and political subdivisions
35,656

 
270

 
131

 
35,795

Mortgage-backed securities
36,661

 
124

 
311

 
36,474

Agency Securities
147

 
83

 
—

 
230

Corporate debt securities
5,410

 
—

 
67

 
5,343

Total available for sale securities
$
96,328

 
$
512

 
$
957

 
$
95,883
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities held to maturity
Held to maturity securities
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
September 30, 2018
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
1,307

 
$
—

 
$
5

 
$
1,302

Mortgage-backed securities
3,312

 
36

 
41

 
3,307

Total held to maturity securities
$
4,619

 
$
36

 
$
46

 
$
4,609

September 30, 2017
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
1,311

 
$
17

 
$
—

 
$
1,328

Mortgage-backed securities
4,142

 
136

 
1

 
4,277

Total held to maturity securities
$
5,453

 
$
153

 
$
1

 
$
5,605
The estimated fair value of securities by contractual maturity
The estimated fair value of available for sale securities at September 30, 2018, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities on mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Expected maturities may differ from contractual maturities on certain agency and municipal securities due to the call feature.
Available for sale securities
 
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
 
$
1,657

 
$
1,651

Due after one year through five years
 
20,045

 
19,739

Due after five years through ten years
 
39,069

 
37,578

Due after ten years
 
18,544

 
17,960

Total securities with contractual maturities
 
79,315

 
76,928

Mortgage backed securities
 
42,796

 
41,372

Securities without contractual maturities
 
104

 
182

Total available for sale securities
 
$
122,215

 
$
118,482



Held to maturity securities
 
Amortized
Cost
 
Estimated
Fair Value
Due after one year through five years
 
$
1,307

 
$
1,302

Mortgage backed securities
 
3,312

 
3,307

Total held to maturity securities
 
$
4,619

 
$
4,609
Available for sale securities with unrealized losses
Securities with unrealized losses at September 30, 2018 and 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
 
 
 
Less than 12 Months
 
12 Months or More
 
Total
Available for sale securities
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
2018
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency obligations
 
$
22,283

 
$
311

 
$
11,771

 
$
969

 
$
34,054

 
$
1,280

Obligations of states and political subdivisions
 
25,019

 
393

 
8,647

 
403

 
33,666

 
796

Mortgage-backed securities
 
18,323

 
418

 
20,968

 
1,033

 
39,291

 
1,451

Agency securities
 
1,247

 
3

 
5,029

 
314

 
6,276

 
317

Total
 
$
66,872

 
$
1,125

 
$
46,415

 
$
2,719

 
$
113,287

 
$
3,844

2017
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency obligations
 
$
8,296

 
$
186

 
$
6,932

 
$
262

 
$
15,228

 
$
448

Obligations of states and political subdivisions
 
8,170

 
62

 
3,701

 
70

 
11,871

 
132

Mortgage-backed securities
 
14,167

 
96

 
9,753

 
215

 
23,920

 
311

Corporate debt securities
 
5,343

 
67

 
—

 
—

 
5,343

 
67

Total
 
$
35,976

 
$
411

 
$
20,386

 
$
547

 
$
56,362

 
$
958
Held to maturity securities with unrealized losses
 
 
Less than 12 Months
 
12 Months or More
 
Total
Held to maturity securities
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
2018
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,302

 
$
5

 
$
—

 
$
—

 
$
1,302

 
$
5

Mortgage-backed securities
 
2,383

 
28

 
286

 
13

 
2,669

 
41

Total
 
$
3,685

 
$
33

 
$
286

 
$
13

 
$
3,971

 
$
46

2017
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Mortgage-backed securities
 
406

 
1

 
—

 
—

 
406

 
1

Total
 
$
406

 
$
1

 
$
—

 
$
—

 
$
406

 
$
1