Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive (loss) income, net [Member]	Total
Balance in the beginning at Dec. 31, 2017		$ 515	$ 970,668	$ 60,795	$ (493,329)	$ (6,242)	$ 532,407
Increase (Decrease) in Stockholders' Equity
Net income				8,464			8,464
Stock-based compensation			833				833
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net			(1,476)		5,319		3,843
Reissuance of treasury stock of 3,398,477 shares for acquisition of Peoples, Inc.			42,243		67,970		110,213
Cash dividends declared				(2,756)			(2,756)
Reclassification of certain tax effects from accumulated other comprehensive income	[1]			1,479		(1,479)
Cumulative effect adjustment	[2]			26			26
Other comprehensive income (loss)						(7,167)	(7,167)
Balance in the ending at Mar. 31, 2018		515	1,012,268	68,008	(420,040)	(14,888)	645,863
Balance in the beginning at Dec. 31, 2018		515	1,014,399	106,990	(415,623)	(11,275)	695,006
Increase (Decrease) in Stockholders' Equity
Net income				18,922			18,922
Stock-based compensation			376				376
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net			(1,801)		2,397		596
Cash dividends declared				(5,289)			(5,289)
Cumulative effect adjustment	[3]			256			256
Other comprehensive income (loss)						5,135	5,135
Balance in the ending at Mar. 31, 2019		$ 515	$ 1,012,974	$ 120,879	$ (413,226)	$ (6,140)	$ 715,002

[1] Related to the adoption of Accounting Standards Update No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

[2] Related to the adoption of Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities.

[3] Related to the adoption of Accounting Standards Update No. 2016-02, Leases. Refer to note 2 - Recent Accounting Pronouncements of our consolidated financial statements for further details.