Financial Instruments with Off-Balance Sheet Risk (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Interest Rate Derivative Assets, at Fair Value	$ 5,000,000	$ 3,100,000
Interest Rate Derivative Liabilities, at Fair Value	3,200,000	3,100,000
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval	10,500,000
Expected reclassifications into interest expense on cash flow hedge in next twelve months	0
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	1,800,000
Reclassifications into earnings on cash flow hedge	0
Fair Value of Interest Rate Swaps	$ 3,200,000	3,100,000
Maximum Length of Time Hedged in Cash Flow Hedge	25 months
Reclassifications into Interest expense on cash flow hedge	$ 0
Interest Rate Swap
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	247,300,000	$ 144,400,000
Interest Rate Swap
Derivative [Line Items]
Notional Amount of Interest Rate Derivatives	$ 40,000,000