Tax Expense Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 319,000	$ 2,381,000	$ 14,671,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	366,000	934,000	1,023,000
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount	(294,000)	(217,000)	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount	128,000
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount	(791,000)	0	42,000
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	0	0	(693,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(1,472,000)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	1,398,000	1,011,000	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(6,777,000)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	684,000	(782,000)	(541,000)
Income Tax Expense (Benefit)	$ (9,235,000)	$ 1,305,000	$ 14,502,000