Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 2,381	$ 14,671	$ 22,545
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	934	1,023	1,660
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(217)	0	(350)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount	0	(42)	0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	0	(693)	0
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	1,011	0	0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(782)	(541)	(458)
Income Tax Expense (Benefit)	$ 1,305	$ 14,502	$ 23,397