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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,357 | $ 6,211 | $ 5,049 | $ 6,652 | $ 6,335 | $ 5,956 | $ 6,114 | $ 5,615 | $ 24,269 | $ 24,020 | $ 16,721
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Earned ESOP shares |  |  |  |  |  |  |  |  | 31 | 441 | 882
Stock option compensation expense |  |  |  |  |  |  |  |  | 182 | 159 | 172
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 33,856 | 18,108 | 21,450
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Purchase of investment securities held to maturity |  |  |  |  |  |  |  |  | (10,255) | (13,166) | (6,073)
Cash acquired, net of cash consideration paid in business combination |  |  |  |  |  |  |  |  | 0 | 14,284 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | (154,668) | (44,547) | (68,269)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (1,238) | (499) | 0
Payment of dividends |  |  |  |  |  |  |  |  | (7,083) | (6,495) | (4,431)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 292,249 | 20,590 | 47,495
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  |  | 143,015 |  |  |  | 148,864 | 143,015 | 148,864 | 148,188
End of year | 314,452 |  |  |  | 143,015 |  |  |  | 314,452 | 143,015 | 148,864
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 24,269 | 24,020 | 16,721
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of Bank |  |  |  |  |  |  |  |  | (15,844) | (17,693) | (12,595)
Earned ESOP shares |  |  |  |  |  |  |  |  | 31 | 441 | 882
Stock option compensation expense |  |  |  |  |  |  |  |  | 182 | 159 | 172
Other, net |  |  |  |  |  |  |  |  | (279) | 9 | 280
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 8,359 | 6,936 | 5,460
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Investment in Bank |  |  |  |  |  |  |  |  | (187) | (14,915) | (1,271)
Purchase of investment securities held to maturity |  |  |  |  |  |  |  |  | (500) | 0 | 0
Principal repayments on loan receivable from ESOP |  |  |  |  |  |  |  |  | 0 | 285 | 536
Net cash used in investing activities |  |  |  |  |  |  |  |  | (687) | (346) | (735)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 391 | 401 | 318
Repurchase of common stock |  |  |  |  |  |  |  |  | (1,238) | (499) | 0
Payment of dividends |  |  |  |  |  |  |  |  | (7,083) | (6,495) | (4,431)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (7,930) | (6,593) | (4,113)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (258) | (3) | 612
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  |  | $ 2,891 |  |  |  | $ 2,894 | 2,891 | 2,894 | 2,282
End of year | $ 2,633 |  |  |  | $ 2,891 |  |  |  | $ 2,633 | $ 2,891 | $ 2,894

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