Loans and Allowance (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				$ 12,641			$ 13,412	$ 12,641	$ 13,168	$ 13,412
Provision charged (credited) to expense	$ 250	$ 250	$ 150	200	$ 125	$ 500	350	850	125	850
Losses charged off								(1,482)	(1,387)	(1,882)
Recoveries								373	735	788
Allowance for loan losses, End of period	12,382				12,641			12,382	12,641	13,168
Allowance for loan losses, individually evaluated for impairment, Ending balance											$ 100	$ 100
Allowance for loan losses, collectively evaluated for impairment, Ending balance											12,282	12,541	13,168
Total allowance for loan losses	12,382			12,641	12,641		13,412	12,641	13,168	13,412	12,382	12,641	13,168
Loans, individually evaluated for impairment, Ending balance											3,757	6,700	7,760
Loans, collectively evaluated for impairment, Ending balance											1,168,879	1,076,695	1,014,628
Total loans receivable											1,172,636	1,083,395	1,022,388
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				7,090			8,148	7,090	7,085	8,148
Provision charged (credited) to expense								457	(389)	(1,273)
Losses charged off								(274)	(104)	(289)
Recoveries								85	498	499
Allowance for loan losses, End of period	7,358				7,090			7,358	7,090	7,085
Allowance for loan losses, individually evaluated for impairment, Ending balance											100	100
Allowance for loan losses, collectively evaluated for impairment, Ending balance											7,258	6,990	7,085
Total allowance for loan losses	7,358			7,090	7,090		8,148	7,090	7,085	8,148	7,358	7,090	7,085
Loans, individually evaluated for impairment, Ending balance											1,888	5,093	6,622
Loans, collectively evaluated for impairment, Ending balance											454,245	370,589	312,973
Total loans receivable											456,133	375,682	319,595
Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				2,683			3,124	2,683	3,471	3,124
Provision charged (credited) to expense								15	(179)	888
Losses charged off								(420)	(643)	(572)
Recoveries								25	34	31
Allowance for loan losses, End of period	2,303				2,683			2,303	2,683	3,471
Allowance for loan losses, individually evaluated for impairment, Ending balance
Allowance for loan losses, collectively evaluated for impairment, Ending balance											2,303	2,683	3,471
Total allowance for loan losses	2,303			2,683	2,683		3,124	2,683	3,471	3,124	2,303	2,683	3,471
Loans, individually evaluated for impairment, Ending balance											1,869	1,126	1,138
Loans, collectively evaluated for impairment, Ending balance											476,979	490,325	515,925
Total loans receivable											478,848	491,451	517,063
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				2,868			2,140	2,868	2,612	2,140
Provision charged (credited) to expense								378	693	1,235
Losses charged off								(788)	(640)	(1,021)
Recoveries								263	203	258
Allowance for loan losses, End of period	2,721				2,868			2,721	2,868	2,612
Allowance for loan losses, individually evaluated for impairment, Ending balance
Allowance for loan losses, collectively evaluated for impairment, Ending balance											2,721	2,868	2,612
Total allowance for loan losses	$ 2,721			$ 2,868	$ 2,868		$ 2,140	$ 2,868	$ 2,612	$ 2,140	2,721	2,868	2,612
Loans, individually evaluated for impairment, Ending balance												481
Loans, collectively evaluated for impairment, Ending balance											237,655	215,781	185,730
Total loans receivable											$ 237,655	$ 216,262	$ 185,730