Commitments and Off-balance Sheet Items (Summary of Commitments and Contingencies) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Commitment to Sell Loans, Mandatory
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	$ 973	$ 0
Variable Rate	0	0
Commitment to Sell Loans, Non-Mandatory
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	30,708	25,925
Variable Rate	677	0
Standby Letters of Credit
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	1,059	1,075
Variable Rate	7,869	5,944
Commitments to Fund Loans:
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	48,439	37,458
Variable Rate	512,471	394,138
Consumer Lines | Commitments to Fund Loans:
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	10,081	8,590
Variable Rate	237,087	178,828
Residential Mortgages | Commitments to Fund Loans:
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	13,760	14,588
Variable Rate	765	66
Commercial Operating Lines | Commitments to Fund Loans:
Commitments and Contingent Liabilities [Line Items]
Fixed Rate	24,598	14,280
Variable Rate	$ 274,619	$ 215,244