Other Assets Investments in Limited Partnerships (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Schedule of Equity Method Investments [Line Items] | |||
| Share of the partnerships’ income | $ 790,000 | $ 481,000 | $ 774,000 |
| Investment in limited partnerships | 3,963,000 | 3,215,000 | |
| Investment in Historic Development Entities | 737,000 | 578,000 | |
| Aldine Capital Fund, LP | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Investment in limited partnerships | 883,000 | 1,000,000 | |
| Aldine Capital Fund II, LP | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Investment in limited partnerships | $ 3,100,000 | $ 2,200,000 | |