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Parent Company Only Condensed Financial Statements - Statements of Financial Cash Flow (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 06, 2017 | Jul. 31, 2017 | 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 (loss) |  |  | $ (766,000) | $ 9,755,000 | $ 6,146,000 | $ 6,560,000 | $ 63,915,000 | $ 1,565,000 | $ 2,601,000 | $ (1,352,000) | $ 21,695,000 | $ 66,729,000 | $ (14,974,000)
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | 1,497,000 | 899,000 | 1,045,000
Exercise of share-based awards |  |  |  |  |  |  |  |  |  |  |  | 40,000 |
Accretion of junior subordinated debentures discount |  |  |  |  |  |  |  |  |  |  | 721,000 | 876,000 | 944,000
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash paid in acquisition of business |  |  |  |  |  |  |  |  |  |  |  | (11,273,000) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving line of credit |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |
Repayments of revolving line of credit |  | $ (16,200,000) |  |  |  |  |  |  |  |  | (20,650,000) | (9,350,000) |
Dividends paid on preferred stock |  |  |  |  |  |  |  |  |  |  | (11,277,000) |  |
Cash paid in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  | (2,000) |  |
Proceeds from issuance of common stock, net | $ 82,700,000 |  |  |  |  |  |  |  |  |  | 76,829,000 | 49,592,000 |
Proceeds from issuance of preferred stock |  |  |  |  |  |  |  |  |  |  | 1,050,000 | 9,388,000 |
Repurchase of preferred stock |  |  |  |  |  |  |  |  |  |  | (15,003,000) |  |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  |  |  | 11,816,000 | 1,649,000 | (111,769,000)
CASH AND CASH EQUIVALENTS, beginning of period |  |  |  |  |  | 46,533,000 |  |  |  | 44,884,000 | 46,533,000 | 44,884,000 | 156,653,000
CASH AND CASH EQUIVALENTS, end of period |  |  | 58,349,000 |  |  |  | 46,533,000 |  |  |  | 58,349,000 | 46,533,000 | 44,884,000
Company |  |  |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 21,695,000 | 66,729,000 | (14,974,000)
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income (loss) of subsidiary |  |  |  |  |  |  |  |  |  |  | (22,306,000) | (69,717,000) | 12,359,000
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | 1,497,000 | 899,000 | 1,045,000
Exercise of share-based awards |  |  |  |  |  |  |  |  |  |  |  | 40,000 |
Accretion of junior subordinated debentures discount |  |  |  |  |  |  |  |  |  |  | 721,000 | 876,000 | 944,000
Changes in other assets and other liabilities |  |  |  |  |  |  |  |  |  |  | (2,893,000) | 16,000 | (5,546,000)
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  | (1,286,000) | (1,157,000) | (6,172,000)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances from subsidiary |  |  |  |  |  |  |  |  |  |  |  | (32,019,000) |
Net cash paid in acquisition of business |  |  |  |  |  |  |  |  |  |  |  | (36,586,000) |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  | (68,605,000) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving line of credit |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |
Repayments of revolving line of credit |  |  |  |  |  |  |  |  |  |  | (20,650,000) | (9,350,000) |
Dividends paid on preferred stock |  |  |  |  |  |  |  |  |  |  | (11,277,000) |  |
Cash paid in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  | (2,000) |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  |  | 76,829,000 | 49,592,000 |
Proceeds from issuance of preferred stock |  |  |  |  |  |  |  |  |  |  | 1,050,000 | 9,388,000 |
Repurchase of preferred stock |  |  |  |  |  |  |  |  |  |  | (15,003,000) |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  | 30,947,000 | 79,630,000 |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  |  |  | 29,661,000 | 9,868,000 | (6,172,000)
CASH AND CASH EQUIVALENTS, beginning of period |  |  |  |  |  | $ 9,965,000 |  |  |  | $ 97,000 | 9,965,000 | 97,000 | 6,269,000
CASH AND CASH EQUIVALENTS, end of period |  |  | $ 39,626,000 |  |  |  | $ 9,965,000 |  |  |  | $ 39,626,000 | $ 9,965,000 | $ 97,000

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