Bank Premises and Equipment Bank Premises and Equipment (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Leases [Abstract]
Property Subject to or Available for Operating Lease, Gross	$ 10,600,000	$ 10,600,000	$ 4,300,000
Rental Income, Nonoperating	392,000	448,000
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	$ 245,000	$ 289,000