Investment and Mortgage-Backed Securities, Held to Maturity (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015 USD ($)	May. 29, 2015 USD ($) investment	Dec. 31, 2014 USD ($)
Held to Maturity, Number of securities transferred from AFS | investment		22
Proceeds from Sale of Held-to-maturity Securities	$ 0
Held-to-maturity Securities, Fair Value	30,730,644	$ 32,800,000	$ 0
Held to maturity, unrealized gain	602,000
Held-to-maturity Securities Pledged as Collateral	26,900,000
Held to maturity pledged as collateral, fair value	26,800,000
US Government Agencies Debt Securities [Member]
Held-to-maturity Securities, Fair Value	21,300,000
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 21,400,000