Disclosures About Fair Value of Financial Instruments - Reconciliation of beginning and ending balances of recurring fair value measurements using significant unobservable (Details 1) (Fair Value, Measurements, Recurring, Available-for-Sale Securities, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Measurements, Recurring | Available-for-Sale Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,268	$ 1,197
Accretion	2	7
Total realized and unrealized gains and losses
Unrealized gains included in other comprehensive income	102	63
Settlements, including pay downs	(7)	(59)
Ending balance	1,365	1,208
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date