Income Tax - (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Tax [Abstract]
Unused business income tax credits	$ 2,749,000
AMT credit carryover	$ 1,351,000
ATM credit carryforward, expiration period	unlimited
Unused business income tax expiration year	Dec. 31, 2028
State net operating loss	$ 23,011,000
State net operating loss expiration year	Dec. 31, 2023
Recognized deferred income tax liability	$ 14,743,000
Unrecorded deferred income tax liability	$ 5,013,000