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Fair Value Measurements: Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Recorded Amount    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 148,864 $ 148,188
CDs held for investment 63,290 43,034
Investment securities 13,964 8,380
FHLB stock 1,190 1,107
Other investments   3,000
Other investments 3,000  
Loans held for sale 1,785 3,599
Loans receivable, net 725,391 690,364
Accrued interest receivable 2,877 2,520
Non-interest-bearing demand 233,258 205,952
Interest-bearing 656,248 631,946
Total deposits 889,506 837,898
Accrued interest payable 225 161
Fair Value    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 148,864 148,188
CDs held for investment 63,290 43,034
Investment securities 14,418 8,985
FHLB stock 1,190 1,107
Other investments   3,000
Other investments 3,000  
Loans held for sale 1,814 3,619
Loans receivable, net 711,071 688,332
Accrued interest receivable 2,877 2,520
Non-interest-bearing demand 233,258 205,952
Interest-bearing 655,271 632,629
Total deposits 888,529 838,581
Accrued interest payable 225 161
Fair Value | Fair Value, Inputs, Level 1    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 148,864 148,188
CDs held for investment 63,290 43,034
Investment securities 8,812 3,954
FHLB stock 1,190 1,107
Other investments   3,000
Other investments 3,000  
Loans held for sale 1,814 3,619
Loans receivable, net 0 0
Accrued interest receivable 2,877 2,520
Non-interest-bearing demand 233,258 205,952
Interest-bearing 514,440 492,305
Total deposits 747,698 698,257
Accrued interest payable 225 161
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 5,606 5,031
FHLB stock 0 0
Other investments   0
Other investments 0  
Loans held for sale 0 0
Loans receivable, net 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   0
Other investments 0  
Loans held for sale 0 0
Loans receivable, net 711,071 688,332
Accrued interest receivable 0 0
Non-interest-bearing demand 0 0
Interest-bearing 140,831 140,324
Total deposits 140,831 140,324
Accrued interest payable $ 0 $ 0