Disclosures About Fair Value of Assets and Liabilities - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Details) (Fair Value, Measurements, Recurring, Available for Sale Securities, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Measurements, Recurring | Available for Sale Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 7,533	$ 17,915	$ 9,977	$ 18,328
Included in net income
Included in other comprehensive income	68	(486)	2,960	(521)
Purchases, issuances and settlements
Transfers in/(out) of Level 3		3,905		3,905
Principal payments	(114)	(336)	(5,450)	(714)
Ending balance	$ 7,487	$ 20,998	$ 7,487	$ 20,998