CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2013	$ 499,363,000	$ 24,990,000	$ 193,445,000	$ 283,898,000	$ (2,970,000)
Net income	10,928,000	0	0	10,928,000	0
Other comprehensive loss, net of tax	4,320,000	0	0	0	4,320,000
Common stock dividends	(4,541,000)	0	0	(4,541,000)	0
Stock compensation expense	395,000	0	395,000	0	0
Common stock issued pursuant to:
Stock option plan	90,000	7,000	83,000	0	0
Employee stock purchase plan	121,000	5,000	116,000	0	0
Restricted stock	290,000	(41,000)	331,000	0	0
Balances at Mar. 31, 2014	510,386,000	25,043,000	193,708,000	290,285,000	1,350,000
Balances at Dec. 31, 2014	521,751,000	25,045,000	194,647,000	302,882,000	(823,000)
Net income	11,225,000	0	0	11,225,000	0
Other comprehensive loss, net of tax	2,969,000	0	0	0	2,969,000
Common stock dividends	(5,561,000)	0	0	(5,561,000)	0
Stock compensation expense	422,000	0	422,000	0	0
Common stock issued pursuant to:
Stock option plan	74,000	6,000	68,000	0	0
Employee stock purchase plan	169,000	6,000	163,000	0	0
Restricted stock	243,000	(28,000)	271,000	0	0
Purchase of treasury shares - 351,369 shares	(9,038,000)	(351,000)	(8,687,000)	0	0
Balances at Mar. 31, 2015	$ 521,768,000	$ 24,734,000	$ 186,342,000	$ 308,546,000	$ 2,146,000