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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
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 166,207 148,188
CDs held for investment 53,528 43,034
Investment securities 8,298 8,380
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 3,407 3,599
Loans Receivable, Fair Value Disclosure 705,268 690,364
Accrued interest receivable 2,743 2,520
Non-interest-bearing demand 210,108 205,952
Interest-bearing 665,966 631,946
Total deposits 876,074 837,898
Accrued interest payable 178 161
Fair Value    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 166,207 148,188
CDs held for investment 53,528 43,034
Investment securities 8,830 8,985
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 3,501 3,619
Loans Receivable, Fair Value Disclosure 697,940 688,332
Accrued interest receivable 2,743 2,520
Non-interest-bearing demand 210,108 205,952
Interest-bearing 665,783 632,629
Total deposits 875,891 838,581
Accrued interest payable 178 161
Fair Value | Fair Value, Inputs, Level 1    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 166,207 148,188
CDs held for investment 53,528 43,034
Investment securities 3,910 3,954
FHLB stock 1,107 1,107
Other investments, at cost 3,000 3,000
Loans receivable, net 3,501 3,619
Loans Receivable, Fair Value Disclosure 0 0
Accrued interest receivable 2,743 2,520
Non-interest-bearing demand 210,108 205,952
Interest-bearing 528,543 492,305
Total deposits 738,651 698,257
Accrued interest payable 178 161
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 4,920 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 697,940 688,332
Accrued interest receivable 0 0
Non-interest-bearing demand 0 0
Interest-bearing 137,240 140,324
Total deposits 137,240 140,324
Accrued interest payable $ 0 $ 0
[1] Derived from audited consolidated financial statements.