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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

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