Investments Maturities of Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities		$ 116,352		$ 140,727
Held-to-maturity Securities, Fair Value		116,384		$ 142,339
Weighted Average Remaining Maturity, Held To Maturity Securities				13 years 9 months 24 days	14 years 9 months 18 days
Mortgage Backed Securities, Other [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	[1]	0
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	[1]	$ 0
Held to maturity securities, Maturities, Next Twelve Months, Weighted Average Yield	[1]	0.00%
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	[1]	$ 0
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	[1]	$ 0
Held to maturity securities, Maturities, Year Two Through Five, Weighted Average Yield	[1]	0.00%
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	[1]	$ 0
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	[1]	$ 0
Held to maturity securities, Maturities, Year Six Through Ten, Weighted Average Yield	[1]	0.00%
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	[1]	$ 116,352
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	[1]	$ 116,384
Held to maturity Securities, Maturities, After Ten Years, Weighted Average Yield	[1]	2.26%
Held-to-maturity Securities	[2]	$ 116,352	[1]	$ 140,727
Held-to-maturity Securities, Fair Value	[2]	$ 116,384	[1]	$ 142,339
Held to maturity securities, Weighted average yield	[1]	2.26%

[1] Mortgage-backed securities are shown based on their final (contractual) maturity, but, due to prepayments, they are expected to have shorter lives.

[2] All mortgage-backed securities are guaranteed by U.S. government agencies or Government-sponsored entities.