Deposits (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Maturities of certificates and other time deposits $100,000 or more
Three months or less	$ 83,584,000	$ 81,518,000
Over three through six months	86,893,000	67,817,000
Over six through twelve months	95,389,000	111,067,000
Over one through two years	112,316,000	44,866,000
Over two through three years	43,191,000	28,822,000
Over three through four years	74,745,000	37,335,000
Over four through five years	9,158,000	68,955,000
Total	505,276,000	440,380,000
Time deposits disclosures
Interest expense on certificates of deposits and other time deposits of $100,000 or more	5,500,000	6,100,000	5,200,000
Brokered time deposits	$ 5,700,000	$ 14,800,000