CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Tax effect on unrealized holding gains (losses) on securities arising during the period	$ 3,200,000	$ (2,300,000)	$ 1,400,000
Income tax expense on reclassification adjustment for net gain on sale of securities included in net income	636,000	635,000	801,000
Tax effect on net unrealized gain (loss) on securities	$ 2,500,000	$ (2,900,000)	$ 551,000