Loans and Allowance (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period	$ 12,387,000	$ 12,382,000
Provision charged (credited) to expense	450,000	200,000
Losses charged off	(372,000)	(249,000)
Recoveries	72,000	49,000
Allowance for loan losses, End of period	12,537,000	12,382,000
Allowance for loan losses, individually evaluated for impairment, Ending balance			$ 100,000	$ 100,000	$ 100,000
Allowance for loan losses, collectively evaluated for impairment, Ending balance			12,437,000	12,287,000	12,282,000
Total allowance for loan losses	12,387,000	12,382,000	12,537,000	12,387,000	12,382,000
Loans, individually evaluated for impairment, Ending balance			3,246,000	3,607,000	3,848,000
Loans, collectively evaluated for impairment, Ending balance			1,448,903,000	1,183,106,000	1,167,539,000
Total loans receivable			1,452,461,000	1,186,713,000	1,171,387,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable			312,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period	7,704,000	7,358,000
Provision charged (credited) to expense	408,000	32,000
Losses charged off	(138,000)
Recoveries		7,000
Allowance for loan losses, End of period	7,974,000	7,397,000
Allowance for loan losses, individually evaluated for impairment, Ending balance			100,000	100,000	100,000
Allowance for loan losses, collectively evaluated for impairment, Ending balance			7,874,000	7,604,000	7,297,000
Total allowance for loan losses	7,704,000	7,358,000	7,974,000	7,704,000	7,397,000
Loans, individually evaluated for impairment, Ending balance			1,835,000	2,064,000	1,998,000
Loans, collectively evaluated for impairment, Ending balance			693,903,000	475,863,000	454,481,000
Total loans receivable			696,050,000	477,927,000	456,479,000
Commercial | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable			312,000
Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period	1,761,000	2,303,000
Provision charged (credited) to expense	(49,000)	17,000
Losses charged off	(20,000)	(45,000)
Recoveries	8,000	4,000
Allowance for loan losses, End of period	1,700,000	2,279,000
Allowance for loan losses, individually evaluated for impairment, Ending balance
Allowance for loan losses, collectively evaluated for impairment, Ending balance			1,700,000	1,761,000	2,279,000
Total allowance for loan losses	1,761,000	2,303,000	1,700,000	1,761,000	2,279,000
Loans, individually evaluated for impairment, Ending balance			1,411,000	1,543,000	1,850,000
Loans, collectively evaluated for impairment, Ending balance			475,011,000	442,700,000	473,497,000
Total loans receivable			476,422,000	444,243,000	475,347,000
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period	2,922,000	2,721,000
Provision charged (credited) to expense	91,000	151,000
Losses charged off	(214,000)	(204,000)
Recoveries	64,000	38,000
Allowance for loan losses, End of period	2,863,000	2,706,000
Allowance for loan losses, individually evaluated for impairment, Ending balance
Allowance for loan losses, collectively evaluated for impairment, Ending balance			2,863,000	2,922,000	2,706,000
Total allowance for loan losses	$ 2,922,000	$ 2,721,000	2,863,000	2,922,000	2,706,000
Loans, collectively evaluated for impairment, Ending balance			279,989,000	264,543,000	239,561,000
Total loans receivable			$ 279,989,000	$ 264,543,000	$ 239,561,000