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Parent Only Condensed Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2012
Cash flows from operating activities: |  |  |  |  |
Net income |  | $ 21,289 | $ 14,026 | $ 15,182 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |
Stock-based compensation |  | 482 | 384 | 284 |
Tax benefit from exercise of stock options |  | 0 | 0 | (30) |
Benefit for deferred income taxes |  | 403 | 7,184 | 2,592 |
Cash flows from financing activities: |  |  |  |  |
Cash dividend payments on common stock |  | (4,270) | (3,010) | (2,715) |
Purchase and retirement of common stock | $ 0 | 894 |  |  | $ 0
Proceeds from exercise of stock options |  | 738 | 2,835 | 231 |
Tax benefit from exercise of stock options |  | 0 | 0 | 30 |
Net cash (used in) provided by financing activities |  | (137,602) | (9,902) | (720) |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  | 100,383 | 38,568 | 94,617 |
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 31,727 | 100,383 | 38,568 |
Non-cash investing and financing activities: |  |  |  |  |
Common stock issued in acquisitions |  | 0 | 28,405 | 16,678 |
Proceeds from stock issued under employee stock purchase plan |  | 211 | 45 | 0 |
Parent Company |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |
Net income |  | 21,289 | 14,026 | 15,182 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |
Undistributed net income of subsidiary, net of distributions |  | (19,075) | (11,754) | (2,852) |
Stock-based compensation |  | 482 | 384 | 284 |
Tax benefit from exercise of stock options |  | 0 | 0 | (30) |
Net (increase) decrease in other assets |  | 372 | (114) | (405) |
Net increase (decrease) in other liabilities |  | 166 | (7) | 64 |
Benefit for deferred income taxes |  | 11 | 155 | 98 |
Net cash provided by (used in) operating activities |  | 3,245 | 2,690 | 12,341 |
Cash flows used in investing activities: |  |  |  |  |
Investment in subsidiary |  | 0 | (151) | (9,584) |
Cash flows from financing activities: |  |  |  |  |
Cash dividend payments on common stock |  | (4,270) | (3,010) | (2,715) |
Purchase and retirement of common stock |  |  | 894 | 0 | $ 0
Proceeds from exercise of stock options |  | 738 | 2,880 | 231 |
Tax benefit from exercise of stock options |  | 0 | 0 | 30 |
Net cash (used in) provided by financing activities |  | (4,215) | (130) | (2,454) |
Increase (decrease) in cash and cash equivalents |  | (970) | 2,409 | 303 |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  | 3,296 | 887 | 584 |
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 2,326 | 3,296 | 887 |
Cash paid during the year for interest |  | 185 | 142 | 112 |
Non-cash investing and financing activities: |  |  |  |  |
Common stock issued in acquisitions |  | $ 0 | $ 28,405 | $ 16,678 |

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