Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 175,323	$ 174,644
Goodwill acquired	175	679
Balance at the end of the period	175,498	175,323
Community Banks
Changes in the carrying amount of goodwill
Balance at the beginning of the period	173,710	173,031
Goodwill acquired	175	679
Balance at the end of the period	173,885	173,710
Consumer Finance
Changes in the carrying amount of goodwill
Balance at the beginning of the period			1,613
Balance at the end of the period	$ 1,613	$ 1,613	$ 1,613