Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK, AT COST
Balance at beginning of year at Dec. 31, 2017		$ 186,903	$ 59,208	$ 596	$ (4,633)
Cumulative effect adjustment upon adoption of ASU 2016-01 at Dec. 31, 2017			169	(169)
Beginning balance adjusted at Dec. 31, 2017			59,377	427
Issued treasury shares under the Long Term Incentive Plan		(706)
Stock compensation expense for unvested shares		734
Net income	$ 15,799		15,799
Dividends declared			(3,871)
Other comprehensive (income) loss	(7,226)			(7,226)
Purchased shares					0
Issued shares under the Long Term Incentive Plan					706
Retained shares to cover tax withholdings under the Long Term Incentive Plan					0
Balance at end of year at Jun. 30, 2018	247,510	186,931	71,305	(6,799)	(3,927)
Balance at beginning of year at Mar. 31, 2018		186,594	65,168	(6,595)	(3,927)
Cumulative effect adjustment upon adoption of ASU 2016-01 at Mar. 31, 2018			0	0
Beginning balance adjusted at Mar. 31, 2018			65,168	(6,595)
Issued treasury shares under the Long Term Incentive Plan		0
Stock compensation expense for unvested shares		337
Net income	8,073		8,073
Dividends declared			(1,936)
Other comprehensive (income) loss	(204)			(204)
Purchased shares					0
Issued shares under the Long Term Incentive Plan					0
Retained shares to cover tax withholdings under the Long Term Incentive Plan					0
Balance at end of year at Jun. 30, 2018	247,510	186,931	71,305	(6,799)	(3,927)
Balance at beginning of year at Dec. 31, 2018	262,320	186,163	83,630	(4,030)	(3,443)
Cumulative effect adjustment upon adoption of ASU 2016-01 at Dec. 31, 2018			0	0
Beginning balance adjusted at Dec. 31, 2018			83,630	(4,030)
Issued treasury shares under the Long Term Incentive Plan		(1,140)
Stock compensation expense for unvested shares		664
Net income	16,931		16,931
Dividends declared			(5,004)
Other comprehensive (income) loss	11,907			11,907
Purchased shares					(1,388)
Issued shares under the Long Term Incentive Plan					1,140
Retained shares to cover tax withholdings under the Long Term Incentive Plan					(605)
Balance at end of year at Jun. 30, 2019	284,825	185,687	95,557	7,877	(4,296)
Balance at beginning of year at Mar. 31, 2019		186,483	89,518	595	(3,645)
Cumulative effect adjustment upon adoption of ASU 2016-01 at Mar. 31, 2019			0	0
Beginning balance adjusted at Mar. 31, 2019			89,518	595
Issued treasury shares under the Long Term Incentive Plan		(1,140)
Stock compensation expense for unvested shares		344
Net income	8,543		8,543
Dividends declared			(2,504)
Other comprehensive (income) loss	7,282			7,282
Purchased shares					(1,186)
Issued shares under the Long Term Incentive Plan					1,140
Retained shares to cover tax withholdings under the Long Term Incentive Plan					(605)
Balance at end of year at Jun. 30, 2019	$ 284,825	$ 185,687	$ 95,557	$ 7,877	$ (4,296)