Repurchase Agreements - Maturities (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 81,464,000	$ 116,431,000
Repurchase agreements	$ 77,234,249	$ 109,963,995
Net weighted average borrowing rate	0.61%	0.36%
Overnight (1 Day or Less) [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 0	$ 0
Repurchase agreements	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%
Between 2 and 30 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 81,464,000	$ 114,433,000
Repurchase agreements	$ 77,234,000	$ 108,074,000
Net weighted average borrowing rate	0.61%	0.36%
Between 31 and 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 0	$ 1,998,000
Repurchase agreements	$ 0	$ 1,890,000
Net weighted average borrowing rate	0.00%	0.33%
Greater Than 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 0	$ 0
Repurchase agreements	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%