Loans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Net unamortized loan origination costs	$ 3,000,000	$ 2,600,000
Net unamortized premiums on purchased loans	783,000	84,000
Loans pledged as collateral	1,400,000,000	1,300,000,000
Residential loans in process of foreclosure	5,700,000	2,600,000
Interest lost on nonaccrual loans	1,600,000	1,500,000	$ 1,300,000
Interest income recognized for nonaccrual loans	640,000	522,000	$ 455,000
Nonaccrual loans	18,600,000	13,600,000
Significant commitments to lend to borrowers with nonaccrual or TDR loans	$ 0	$ 0