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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other investments, at cost $ 3,000 $ 3,000 [1]
Recorded Amount    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 169,405 148,188
CDs held for investment 52,938 43,034
Investment securities 9,263 8,380
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 3,981 3,599
Loans Receivable, Fair Value Disclosure 708,568 690,364
Accrued interest receivable 2,655 2,520
Non-interest-bearing demand 222,302 205,952
Interest-bearing 658,109 631,946
Total deposits 880,411 837,898
Accrued interest payable 184 161
Fair Value    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 169,405 148,188
CDs held for investment 52,938 43,034
Investment securities 9,746 8,985
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 4,047 3,619
Loans Receivable, Fair Value Disclosure 696,663 688,332
Accrued interest receivable 2,655 2,520
Non-interest-bearing demand 222,302 205,952
Interest-bearing 658,256 632,629
Total deposits 880,558 838,581
Accrued interest payable 184 161
Fair Value | Fair Value, Inputs, Level 1    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 169,405 148,188
CDs held for investment 52,938 43,034
Investment securities 3,869 3,954
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 4,047 3,619
Loans Receivable, Fair Value Disclosure 0 0
Accrued interest receivable 2,655 2,520
Non-interest-bearing demand 222,302 205,952
Interest-bearing 516,032 492,305
Total deposits 738,334 698,257
Accrued interest payable 184 161
Fair Value | Fair Value, Inputs, Level 2    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
CDs held for investment 0 0
Investment securities 5,877 5,031
FHLB stock 0 0
Other investments, at cost 0 0
Loans receivable, net 0 0
Loans Receivable, Fair Value Disclosure 0 0
Accrued interest receivable 0 0
Non-interest-bearing demand 0 0
Interest-bearing 0 0
Total deposits 0 0
Accrued interest payable 0 0
Fair Value | Fair Value, Inputs, Level 3    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
CDs held for investment 0 0
Investment securities 0 0
FHLB stock 0 0
Other investments, at cost 0 0
Loans receivable, net 0 0
Loans Receivable, Fair Value Disclosure 696,663 688,332
Accrued interest receivable 0 0
Non-interest-bearing demand 0 0
Interest-bearing 142,224 140,324
Total deposits 142,224 140,324
Accrued interest payable $ 0 $ 0
[1] Derived from audited consolidated financial statements.