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Parent Corporation Only Financial Statements (Details) - Condensed Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 10,580 | $ 13,077 | $ 7,683 | $ 11,880 | $ (2,024) | $ 11,856 | $ 10,859 | $ 10,391 | $ 43,220 | $ 31,082 | $ 41,311
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Increase in other assets |  |  |  |  |  |  |  |  | 5,706 | (15,006) | 1,101
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 3,887 | (2,022) | (1,080)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 131,133 | 49,712 | 46,231
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (817,727) | (427,669) | (504,747)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash dividends on common stock |  |  |  |  |  |  |  |  | (9,612) | (9,067) | (8,996)
Cash dividends on preferred stock |  |  |  |  |  |  |  |  |  | (22) | (112)
Issuance cost of common stock |  |  |  |  |  |  |  |  | 180 |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  | (11,250) |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 417 | 767 | 1,424
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 635,777 | 377,461 | 532,564
Decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | (50,817) | (496) | 74,048
Cash and cash equivalents at beginning of period |  |  |  |  |  |  |  |  | 200,399 | 200,895 | 126,847
Cash and cash equivalents at end of period | 149,582 |  |  |  | 200,399 |  |  |  | 149,582 | 200,399 | 200,895
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 43,220 | 31,082 | 41,311
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | (33,458) | (21,926) | (32,472)
Increase in other assets |  |  |  |  |  |  |  |  | 269 | 2,023 | (820)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | (151) | 544 | (1,840)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 9,880 | 11,723 | 6,926
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (7) |  |
Capital infusion to subsidiary |  |  |  |  |  |  |  |  |  | (38,439) | (35,000)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (7) | (38,439) | (35,000)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from subordinated debt |  |  |  |  |  |  |  |  |  |  | 50,000
Cash dividends on common stock |  |  |  |  |  |  |  |  | (9,612) | (9,067) | (8,996)
Cash dividends on preferred stock |  |  |  |  |  |  |  |  |  | (22) | (112)
Issuance cost of common stock |  |  |  |  |  |  |  |  | (180) |  |
Secondary offering of common stock |  |  |  |  |  |  |  |  |  | 38,439 |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  | (11,250) |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 417 | 767 | 1,424
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (9,375) | 18,867 | 42,316
Decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | 498 | (7,849) | 14,583
Cash and cash equivalents at beginning of period |  |  |  |  |  |  |  |  | 7,008 | 14,857 | 274
Cash and cash equivalents at end of period | $ 7,506 |  |  |  | $ 7,008 |  |  |  | $ 7,506 | $ 7,008 | $ 14,857

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