Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Parent	Noncontrolling Interest	Comprehensive Income
Beginning balance (shares) at Dec. 31, 2017		42,753,054
Beginning balance (Total) at Dec. 31, 2017	$ 537,125
Beginning balance (NCI) at Dec. 31, 2017							$ 0
Beginning balance (Parent) at Dec. 31, 2017		$ 4	$ 387,145	$ (431)	$ 141,186	$ 537,125		$ 9,221
Cash dividends on common stock	(2,565)
Ending Balance (shares) at Mar. 31, 2018		42,745,937
Ending Balance (Total) at Mar. 31, 2018	535,081
Ending Balance (Parent) at Mar. 31, 2018		$ 4	387,631	(431)	156,327	535,081		(8,451)
Ending balance (NCI) at Mar. 31, 2018							0
Beginning balance (shares) at Dec. 31, 2017		42,753,054
Beginning balance (Total) at Dec. 31, 2017	537,125
Beginning balance (NCI) at Dec. 31, 2017							0
Beginning balance (Parent) at Dec. 31, 2017		$ 4	387,145	(431)	141,186	537,125		9,221
Net Income (Loss), Total	23,069
Net Income (Loss), Parent	23,069	0	0	0	23,069	23,069		0
Net Income (Loss), NCI	0
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	(11,376)		(11,376)
Other Comprehensive Income (Loss), NCI
Other Comprehensive Income (Loss), Total	(11,376)
Stock Issued During Period, Shares, Shares-based Compensation, Gross		69,133
Stock Issued During Period, Value, Restricted Stock Award, Gross	1,049	$ 0	1,049	0	0	1,049		0
Cash dividends on common stock	(5,130)	$ 0	0	0	(5,130)	(5,130)		0
Ending Balance (shares) at Jun. 30, 2018		42,822,187
Ending Balance (Total) at Jun. 30, 2018	544,734
Ending Balance (Parent) at Jun. 30, 2018		$ 4	388,193	(431)	168,461	544,734		(11,493)
Ending balance (NCI) at Jun. 30, 2018							0
Beginning balance (shares) at Mar. 31, 2018		42,745,937
Beginning balance (Total) at Mar. 31, 2018	535,081
Beginning balance (NCI) at Mar. 31, 2018							0
Beginning balance (Parent) at Mar. 31, 2018		$ 4	387,631	(431)	156,327	535,081		(8,451)
Net Income (Loss), Total	14,701
Net Income (Loss), Parent	14,701	0	0	0	14,701	14,701		0
Net Income (Loss), NCI	0						0
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	(3,042)		(3,042)
Other Comprehensive Income (Loss), NCI							0
Other Comprehensive Income (Loss), Total	(3,042)
Stock Issued During Period, Shares, Shares-based Compensation, Gross		76,250
Stock Issued During Period, Value, Restricted Stock Award, Gross	562	$ 0	562	0	0	562	0	0
Cash dividends on common stock	(2,565)	$ 0	0	0	(2,565)	(2,565)	0	0
Ending Balance (shares) at Jun. 30, 2018		42,822,187
Ending Balance (Total) at Jun. 30, 2018	$ 544,734
Ending Balance (Parent) at Jun. 30, 2018		$ 4	388,193	(431)	168,461	544,734		(11,493)
Ending balance (NCI) at Jun. 30, 2018							0
Reclassification due to adoption of ASU 2016-01 | Accounting Standards Update 2016-01 [Member]					9,338			(9,338)
Beginning balance (shares) at Dec. 31, 2018	42,984,578	42,984,578
Beginning balance (Total) at Dec. 31, 2018	$ 540,369
Beginning balance (NCI) at Dec. 31, 2018	20,139						20,139
Beginning balance (Parent) at Dec. 31, 2018	520,230	$ 4	389,141	(431)	140,546	520,230		(9,030)
Cash dividends on common stock	(2,569)
Ending Balance (shares) at Mar. 31, 2019		43,008,729
Ending Balance (Total) at Mar. 31, 2019	$ 558,961
Ending Balance (Parent) at Mar. 31, 2019		$ 4	390,042	(431)	147,446	538,591		1,530
Ending balance (NCI) at Mar. 31, 2019							20,370
Beginning balance (shares) at Dec. 31, 2018	42,984,578	42,984,578
Beginning balance (Total) at Dec. 31, 2018	$ 540,369
Beginning balance (NCI) at Dec. 31, 2018	20,139						20,139
Beginning balance (Parent) at Dec. 31, 2018	520,230	$ 4	389,141	(431)	140,546	520,230		(9,030)
Net Income (Loss), Total	6,781
Net Income (Loss), Parent	6,566				6,566	6,566
Net Income (Loss), NCI	215						215
Other Comprehensive Income (Loss), Parent						18,678		18,678
Other Comprehensive Income (Loss), NCI							221
Other Comprehensive Income (Loss), Total	18,899
Stock Issued During Period, Shares, Shares-based Compensation, Gross		246,606
Stock Issued During Period, Value, Restricted Stock Award, Gross	1,578		1,578			1,578
Cash dividends on common stock	$ (5,139)				(5,139)	(5,139)
Ending Balance (shares) at Jun. 30, 2019	43,231,184	43,231,184
Ending Balance (Total) at Jun. 30, 2019	$ 562,488
Ending Balance (Parent) at Jun. 30, 2019	541,913	$ 4	390,719	(431)	141,973	541,913		9,648
Ending balance (NCI) at Jun. 30, 2019	20,575						20,575
Beginning balance (shares) at Mar. 31, 2019		43,008,729
Beginning balance (Total) at Mar. 31, 2019	558,961
Beginning balance (NCI) at Mar. 31, 2019							20,370
Beginning balance (Parent) at Mar. 31, 2019		$ 4	390,042	(431)	147,446	538,591		1,530
Net Income (Loss), Total	(2,797)
Net Income (Loss), Parent	(2,903)	0	0	0	(2,903)	(2,903)		0
Net Income (Loss), NCI	106						106
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	8,118		8,118
Other Comprehensive Income (Loss), NCI							99
Other Comprehensive Income (Loss), Total	8,217
Stock Issued During Period, Shares, Shares-based Compensation, Gross		222,455
Stock Issued During Period, Value, Restricted Stock Award, Gross	677	$ 0	677	0	0	677	0	0
Cash dividends on common stock	$ (2,570)	$ 0	0	0	(2,570)	(2,570)	0	0
Ending Balance (shares) at Jun. 30, 2019	43,231,184	43,231,184
Ending Balance (Total) at Jun. 30, 2019	$ 562,488
Ending Balance (Parent) at Jun. 30, 2019	541,913	$ 4	$ 390,719	$ (431)	$ 141,973	$ 541,913		$ 9,648
Ending balance (NCI) at Jun. 30, 2019	$ 20,575						$ 20,575