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Fair Value Measurements Change in Level 3 Securities (Details) - Fair value, inputs, level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance, beginning of period $ 0 $ 1,850 $ 1,334
Transfers into level 3 0 0 0
Total gains or (losses):      
Included in earnings 0 (493) 0
Included in other comprehensive income 0 2,321 516
Sale of securities 0 (3,593) 0
Principal payments 0 (85) 0
Balance, end of period $ 0 $ 0 $ 1,850