Deposits (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Maturities of certificates and other time deposits $100,000 or more
Three months or less	$ 87,233,000		$ 83,584,000
Over three through six months	82,933,000		86,893,000
Over six through twelve months	148,050,000		95,389,000
Over one through two years	91,618,000		112,316,000
Over two through three years	65,857,000		43,191,000
Over three through four years	49,106,000		74,745,000
Over four through five years	10,157,000		9,158,000
Total	534,954,000		505,276,000
Time deposits disclosures
Interest expense on certificates of deposits and other time deposits of $100,000 or more	1,300,000	1,400,000
Brokered time deposits	$ 4,300,000		$ 5,700,000