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Condensed Financial Information - Parent Company Only: Condensed Statements of Cash Flows, Parent Company (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities                      
Net income $ 3,615 $ 4,277 $ 3,128 $ 3,147 $ 2,699 $ 2,547 $ 2,380 $ 2,528 $ 14,167 $ 10,154 $ 8,292
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock option compensation expense                 156 190 127
Net cash provided by operating activities                 13,859 11,817 7,625
Cash flows from investing activities                      
Net cash used in investing activities                 (20,163) (59,548) (49,114)
Cash flows from financing activities                      
Proceeds from exercise of stock warrant                 2,496 0 0
Repurchase of common stock                 0 (820) (709)
Payment of dividends                 (3,641) (2,578) (1,693)
Net cash provided by financing activities                 45,551 64,383 61,424
Net increase in cash and cash equivalents                 39,247 16,652 19,935
Cash and cash equivalents:                      
Beginning of period       108,941       92,289 108,941 92,289 72,354
End of period 148,188       108,941       148,188 108,941 92,289
Parent Company                      
Cash flows from operating activities                      
Net income                 14,167 10,154 8,292
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed income of Bank                 (12,736) (7,223) (5,716)
Earned ESOP shares                 605 404 336
Stock option compensation expense                 156 190 127
Other, net                 33 (65) 162
Net cash provided by operating activities                 2,225 3,460 3,201
Cash flows from investing activities                      
Investment in Bank                 (930) (616) (491)
Principal repayments on loan receivable from ESOP                 493 452 417
Net cash used in investing activities                 (437) (164) (74)
Cash flows from financing activities                      
Proceeds from exercise of stock options                 332 159 30
Proceeds from exercise of stock warrant                 2,496 0 0
Repurchase of common stock                 0 (820) (709)
Payment of dividends                 (3,641) (2,578) (1,693)
Net cash provided by financing activities                 (813) (3,239) (2,372)
Net increase in cash and cash equivalents                 975 57 755
Cash and cash equivalents:                      
Beginning of period       $ 1,307       $ 1,250 1,307 1,250 495
End of period $ 2,282       $ 1,307       $ 2,282 $ 1,307 $ 1,250