Other Assets Other Assets Tax Credit Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Investment in limited partnerships	$ 3,963,000	$ 3,963,000	$ 3,215,000
Investment Tax Credit Impairment Cost		3,691,000	0	$ 0
Investment in Community Development Entities	7,106,000	7,106,000	7,500,000
Mitchell Street Apartments \| Historic Rehabilitation Tax Credits
Tax Credit Carryforward [Line Items]
Investment in limited partnerships	563,000	563,000
Estimated Capital Contributions	5,500,000	$ 5,500,000
Tax Credit Benefit Recognized, Period for Recapture		5 years
Tax Credit Benefits Recognized		$ 0
Rimrock Road \| New Market Tax Credits
Tax Credit Carryforward [Line Items]
New Market Tax Credit Benefit, Period of Recognition		7 years
Federal New Market Tax Credits Not Yet Recognized	1,800,000	$ 1,800,000
Tax Credit Benefits Recognized		375,000
Rimrock Road \| New Market Tax Credits \| Federal New Market Tax Credit
Tax Credit Carryforward [Line Items]
Tax Credit Benefits Recognized			375,000
BOC Investment \| Historic Rehabilitation Tax Credits
Tax Credit Carryforward [Line Items]
Investment in limited partnerships	174,000	174,000	$ 578,000
Capital Contributions		$ 2,800,000
Investment Tax Credit Impairment Cost	3,300,000
Tax Credit Benefits Recognized	$ 3,800,000