Stock Repurchase Program (Details) - USD ($)	12 Months Ended			36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Feb. 21, 2018	Apr. 25, 2017	May 04, 2016
Class of Stock [Line Items]
Repurchased Amount	$ 12,996,000	$ 11,055,000	$ 5,390,000
Common Stock
Class of Stock [Line Items]
Number of Shares	990,229	788,416	319,805	2,098,450
Repurchased Amount	$ 12,995,791	$ 11,054,983	$ 5,390,355	$ 29,441,129
Average Price per Share	$ 13.12	$ 14.02	$ 16.86	$ 14.03
10 Million Authorization Expansion, Expiring May 4, 2018 | Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount							$ 10,000,000.0
15 Million Authorization, Expiring April 25, 2019 | Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 15,000,000.0
Repurchased Amount	$ 12,000,000.0
15 Million Authorization, Expiring February 21, 2020 | Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 15,000,000.0
Remaining authorized repurchase amount	14,000,000.0			$ 14,000,000.0
Repurchased Amount	$ 1,000,000.0