Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Net Income (Loss) Attributable to Parent	$ 27,358,000
Beginning balance (shares) at Dec. 31, 2014		20,904,414
Beginning balance at Dec. 31, 2014	203,763,000	$ 2,000	$ 82,380,000	$ (431,000)	$ 4,011,000	$ 117,801,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Available to Common Stockholders, Basic	27,358,000	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,391,000)	$ 0	0	0	(2,391,000)	0
Stock Issued During Period, Shares, Share-based Compensation, Gross		116,077
Stock Issued During Period, Value, Restricted Stock Award, Gross	1,789,000	$ 0	1,789,000	0	0	0
Stock Issued During Period, Shares, New Issues		503,857
Stock Issued During Period, Value, New Issues	12,994,000	$ 0	12,994,000	0	0	0
Dividends, Common Stock, Cash	(4,302,000)	$ 0	0	0	0	(4,302,000)
Ending balance (shares) at Dec. 31, 2015		21,524,348
Ending balance at Dec. 31, 2015	239,211,000	$ 2,000	97,163,000	(431,000)	1,620,000	140,857,000
Net Income (Loss) Attributable to Parent	5,698,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Available to Common Stockholders, Basic	5,698,000	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(798,000)	$ 0	0	0	(798,000)	0
Stock Issued During Period, Shares, Share-based Compensation, Gross		89,323
Stock Issued During Period, Value, Restricted Stock Award, Gross	1,677,000	$ 0	1,677,000	0	0	0
Stock Issued During Period, Shares, New Issues		32,943
Stock Issued During Period, Value, New Issues	513,000	$ 0	513,000	0	0	0
Dividends, Common Stock, Cash	$ (4,974,000)	$ 0	0	0	0	(4,974,000)
Ending balance (shares) at Dec. 31, 2016	21,646,614	21,646,614
Ending balance at Dec. 31, 2016	$ 241,327,000	$ 2,000	99,353,000	(431,000)	822,000	141,581,000
Net Income (Loss) Attributable to Parent	10,145,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Available to Common Stockholders, Basic	10,145,000	0	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	6,850,000	$ 0	0	0	6,850,000	0
Stock Issued During Period, Shares, Share-based Compensation, Gross		150,085
Stock Issued During Period, Value, Restricted Stock Award, Gross	2,326,000	$ 0	2,326,000	0	0	0
Stock Issued During Period, Shares, New Issues		20,956,355
Stock Issued During Period, Value, New Issues	285,468,000	$ 2,000	285,466,000	0	0	0
Dividends, Common Stock, Cash	$ (8,991,000)	$ 0	0	0	0	(8,991,000)
Ending balance (shares) at Dec. 31, 2017	42,753,054	42,753,054
Ending balance at Dec. 31, 2017	$ 537,125,000	$ 4,000	387,145,000	(431,000)	9,221,000	141,186,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	1,549,000
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02	$ 0	$ 0	$ 0	$ 0	$ 1,549,000	$ (1,549,000)