Schedule II Parent Company Only- Cash Flow Statement (Details) - 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	Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net income (loss) available to common stockholders		$ 10,061	$ (3,114)	$ (4,443)	$ 1,100	$ 7,727	$ 5,905	$ 6,133	$ 5,555	$ 3,604	$ 25,320	$ 5,779
Net cash provided by (used in) operating activities										46,919	36,643	(9,455)
Payments of Ordinary Dividends, Common Stock										3,499	3,191	3,313
Net Cash Provided by (Used in) Financing Activities										(194,406)	276,952	243,663
Net increase in cash										58,190	(6,390)	16,413
Cash and cash equivalents		110,667				49,786				110,667	49,786	60,677	$ 52,053
Income Taxes Paid										5,049	6,176	38,739
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net income (loss) available to common stockholders										3,604	25,320	5,779
Income (Loss) from Subsidiaries, Net of Tax	[1]									(3,345)	(26,176)	2,836
Increase (Decrease) in Other Operating Assets and Liabilities, Net										3,805	4,030	(5,566)
Net cash provided by (used in) operating activities										4,064	3,174	3,049
Payments of Ordinary Dividends, Common Stock										(3,499)	(3,191)	(3,313)
Net Cash Provided by (Used in) Financing Activities										(3,499)	(3,191)	(3,313)
Net increase in cash										565	(17)	(264)
Cash and cash equivalents		$ 565				$ 0				565	0	17	$ 281
Income Taxes Paid										3,669	14	20,510
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries										$ 3,499	$ 3,191	$ 23,559

[1] Eliminated in consolidation