Condensed Consolidated Statements of Shareholders' Equity (unaudited) $ in Thousands	USD ($)
Balance at beginning of period at Dec. 31, 2016	$ 248,980
Cumulative effect of change in accounting at Dec. 31, 2016	352
Balance at beginning of period, as adjusted at Dec. 31, 2016	249,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,974
Cash dividends declared	(2,133)
Issuance of common stock	25
Share based compensation	432
Share based compensation withholding obligation	(427)
Net change in accumulated other comprehensive loss, net of related tax effect	2,272
Balance at end of period at Mar. 31, 2017	255,475
Balance at beginning of period at Dec. 31, 2017	264,933
Cumulative effect of change in accounting at Dec. 31, 2017	0
Balance at beginning of period, as adjusted at Dec. 31, 2017	264,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,161
Cash dividends declared	(3,206)
Issuance of common stock	13
Share based compensation	407
Share based compensation withholding obligation	(888)
Net change in accumulated other comprehensive loss, net of related tax effect	(2,503)
Balance at end of period at Mar. 31, 2018	$ 267,917