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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, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities                      
Net income $ 4,422 $ 4,416 $ 4,269 $ 3,614 $ 3,615 $ 4,277 $ 3,128 $ 3,147 $ 16,721 $ 14,167 $ 10,154
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock option compensation expense                 172 156 190
Net cash provided by operating activities                 21,450 13,859 11,817
Cash flows from investing activities                      
Net cash used in investing activities                 (68,269) (20,163) (59,548)
Cash flows from financing activities                      
Proceeds from exercise of stock warrant                 0 2,496 0
Repurchase of common stock                 0 0 (820)
Payment of dividends                 (4,431) (3,641) (2,578)
Net cash provided by financing activities                 47,495 45,551 64,383
Net increase in cash and cash equivalents                 676 39,247 16,652
Cash and cash equivalents:                      
Beginning of period       148,188       108,941 148,188 108,941 92,289
End of period 148,864       148,188       148,864 148,188 108,941
Parent Company                      
Cash flows from operating activities                      
Net income                 16,721 14,167 10,154
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed income of Bank                 (12,595) (12,736) (7,223)
Earned ESOP shares                 882 605 404
Stock option compensation expense                 172 156 190
Other, net                 280 33 (65)
Net cash provided by operating activities                 5,460 2,225 3,460
Cash flows from investing activities                      
Investment in Bank                 (1,271) (930) (616)
Principal repayments on loan receivable from ESOP                 536 493 452
Net cash used in investing activities                 (735) (437) (164)
Cash flows from financing activities                      
Proceeds from exercise of stock options                 318 332 159
Proceeds from exercise of stock warrant                 0 2,496 0
Repurchase of common stock                 0 0 (820)
Payment of dividends                 (4,431) (3,641) (2,578)
Net cash provided by financing activities                 (4,113) (813) (3,239)
Net increase in cash and cash equivalents                 612 975 57
Cash and cash equivalents:                      
Beginning of period       $ 2,282       $ 1,307 2,282 1,307 1,250
End of period $ 2,894       $ 2,282       $ 2,894 $ 2,282 $ 1,307