Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock (in usd per share)	$ 0.62	$ 0.60	$ 0.60
Stock issuance costs		$ 784
Shares issued from exercise of warrants (in shares)		2,889,996