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Loans Receivable and Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 5,041 $ 5,237 $ 3,949
Impaired Financing Receivable, with Related Allowance, Recorded Investment 732 700 323
Impaired Financing Receivable, Recorded Investment 5,773 5,937 4,272
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 5,129 5,446 4,200
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 732 700 323
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 5,861 6,146 4,523
Impaired Financing Receivable, Related Allowance 41 172 97
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 5,251 4,731 4,304
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 681 606 1,603
Impaired Financing Receivable, Average Recorded Investment 5,932 5,337 5,907
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 177 331 215
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 16 30 53
Impaired Financing Receivable, Interest Income Recognized 193 361 268
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 141 287 175
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized 8 30 42
Impaired Financing Receivable, Cash Basis Interest Income Recognized 149 317 217
Mortgage loans, one-to-four family      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 659 1,192 1,054
Impaired Financing Receivable, with Related Allowance, Recorded Investment 484   0
Impaired Financing Receivable, Recorded Investment 1,143 1,192 1,054
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 703 1,236 1,200
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 484   0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 1,187 1,236 1,200
Impaired Financing Receivable, Related Allowance 3 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 1,127 1,110 1,422
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 194   9
Impaired Financing Receivable, Average Recorded Investment 1,321 1,110 1,431
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 44 71 80
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 16   0
Impaired Financing Receivable, Interest Income Recognized 60 71 80
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 34 62 69
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized 8   0
Impaired Financing Receivable, Cash Basis Interest Income Recognized 42 62 69
Mortgage loans, commercial      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,242 3,190 2,446
Impaired Financing Receivable, with Related Allowance, Recorded Investment     0
Impaired Financing Receivable, Recorded Investment 3,242 3,190 2,446
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 3,242 3,190 2,446
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)     0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 3,242 3,190 2,446
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 3,236 2,920 2,389
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment     760
Impaired Financing Receivable, Average Recorded Investment 3,236 2,920 3,149
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 133 227 121
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized     28
Impaired Financing Receivable, Interest Income Recognized 133 227 149
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 107 192 93
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized     21
Impaired Financing Receivable, Cash Basis Interest Income Recognized 107 192 114
Mortgage loans, land      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 394 63 90
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 141 153
Impaired Financing Receivable, Recorded Investment 394 204 243
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 438 126 195
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 0 141 153
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 438 267 348
Impaired Financing Receivable, Related Allowance 0 27 34
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 125 100 283
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 110 246 383
Impaired Financing Receivable, Average Recorded Investment 235 346 666
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 3 11
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 9
Impaired Financing Receivable, Interest Income Recognized 0 3 20
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 0 3 10
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized 0 0 8
Impaired Financing Receivable, Cash Basis Interest Income Recognized 0 3 18
Consumer loans, home equity and second mortgage      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 555 603 359
Impaired Financing Receivable, with Related Allowance, Recorded Investment     0
Impaired Financing Receivable, Recorded Investment 555 603 359
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 555 603 359
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off)     0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 555 603 359
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 581 459 210
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment     310
Impaired Financing Receivable, Average Recorded Investment 581 459 520
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 3
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized     16
Impaired Financing Receivable, Interest Income Recognized 0 0 19
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 0 0 3
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized     13
Impaired Financing Receivable, Cash Basis Interest Income Recognized 0 0 16
Commercial business loans      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 182 189  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 248 536 170
Impaired Financing Receivable, Recorded Investment 430 725 170
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 182 291  
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 248 536 170
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 430 827 170
Impaired Financing Receivable, Related Allowance 38 128 63
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 176 142  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 370 350 141
Impaired Financing Receivable, Average Recorded Investment 546 492 141
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 30  
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 30 0
Impaired Financing Receivable, Interest Income Recognized 0 60 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 0 30  
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized 0 30 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized 0 60 $ 0
Consumer loans, other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 23  
Impaired Financing Receivable, Recorded Investment 9 23  
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 9    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) 0 23  
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) 9 23  
Impaired Financing Receivable, Related Allowance 0 17  
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 6    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7 10  
Impaired Financing Receivable, Average Recorded Investment 13 10  
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0    
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0  
Impaired Financing Receivable, Interest Income Recognized 0 0  
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized 0    
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized 0 0  
Impaired Financing Receivable, Cash Basis Interest Income Recognized $ 0 $ 0