Repurchase Agreement Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 7,352	$ 7,219	[1]
Available unpledged securities	196,500	213,600
Residential mortgage-backed securities - GSE [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	7,352	7,219
Market value of collateral	16,900	17,100
Residential mortgage-backed securities - GSE [Member] | Overnight and Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	7,352	7,219
Residential mortgage-backed securities - GSE [Member] | 1-90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Residential mortgage-backed securities - GSE [Member] | Over 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 0	$ 0

[1] Derived from audited consolidated financial statements