Investments - Certificates of Deposit (Narrative)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Investments - Certificates Of Deposit Narrative
Certificates of deposit brokered	$ 60,780,000	$ 57,527,000
Number of certificates of deposits sold	3	22	0
Amortized cost of certificates of deposits sold	$ 746,000	$ 5,478,000	$ 0
Realized loss on certificates of deposits sold	$ 1,278	$ 7,251	$ 0