Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 17,331,000	$ 17,033,000	$ 12,535,000
Other comprehensive income (loss):
Unrealized holding gains (losses) on securities available for sale	8,596,000	(11,960,000)	(2,184,000)
Fair value of interest rate swap	11,000	849,000	(1,113,000)
	8,607,000	(11,111,000)	(3,297,000)
Tax effect of unrealized holding gains (losses) on securities available for sale	(3,014,000)	4,186,000	1,229,000
Tax effect of fair value of interest rate swap	(4,000)	(298,000)	390,000
	(3,018,000)	3,888,000	1,619,000
Other comprehensive income (loss), net of tax effect	5,589,000	(7,223,000)	(1,678,000)
Comprehensive income	$ 22,920,000	$ 9,810,000	$ 10,857,000