Credit Quality and Nonperforming Assets (Troubled Debt Restructurings) (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017 USD ($) Number	Jun. 30, 2016 USD ($) Number	Jun. 30, 2017 USD ($) Number	Jun. 30, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment		$ 380	$ 1,999	$ 708	$ 2,581
Post-Modification Outstanding Recorded Investment		380	1,999	708	2,581
Reserve Difference	[1]	108	76	114	75
Reserve		$ 36	$ 169	$ 59	$ 188
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		0	1	0	3
Pre-Modification Outstanding Recorded Investment		$ 0	$ 10	$ 0	$ 80
Post-Modification Outstanding Recorded Investment		0	10	0	80
Reserve Difference	[1]	0	0	0	0
Reserve		$ 0	$ 1	$ 0	$ 6
Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		1	0	1	0
Pre-Modification Outstanding Recorded Investment		$ 15	$ 0	$ 15	$ 0
Post-Modification Outstanding Recorded Investment		15	0	15	0
Reserve Difference	[1]	0	0	0	0
Reserve		0	0	0	0
Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment		365	1,989	693	2,501
Post-Modification Outstanding Recorded Investment		365	1,989	693	2,501
Reserve Difference	[1]	108	76	114	75
Reserve		$ 36	$ 168	$ 59	$ 182
Real Estate Loans [Member] | One to Four Family [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		2	5	3	5
Pre-Modification Outstanding Recorded Investment		$ 43	$ 806	$ 90	$ 806
Post-Modification Outstanding Recorded Investment		43	806	90	806
Reserve Difference	[1]	30	75	32	75
Reserve		$ 30	$ 139	$ 32	$ 139
Real Estate Loans [Member] | Equity Line Of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		3	8	5	10
Pre-Modification Outstanding Recorded Investment		$ 322	$ 1,051	$ 603	$ 1,280
Post-Modification Outstanding Recorded Investment		322	1,051	603	1,280
Reserve Difference	[1]	78	1	82	0
Reserve		$ 6	$ 22	$ 27	$ 30
Real Estate Loans [Member] | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans					1
Pre-Modification Outstanding Recorded Investment					$ 266
Post-Modification Outstanding Recorded Investment					266
Reserve Difference	[1]				$ 0
Real Estate Loans [Member] | Multifamily [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans		0	1	0	1
Pre-Modification Outstanding Recorded Investment		$ 0	$ 132	$ 0	$ 132
Post-Modification Outstanding Recorded Investment		0	132	0	132
Reserve Difference	[1]	0	0	0	0
Reserve		0	7	$ 0	7
Real Estate Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Number				0
Pre-Modification Outstanding Recorded Investment				$ 0
Post-Modification Outstanding Recorded Investment		$ 0	$ 0	0	266
Reserve Difference	[1]			0
Reserve				$ 0	$ 4
Other construction/Land [Member] | Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans				0	1
Pre-Modification Outstanding Recorded Investment				$ 0	$ 17
Post-Modification Outstanding Recorded Investment				0	17
Reserve Difference	[1]			0	0
Reserve				$ 0	$ 2

[1] This represents the change in the ALLL reserve for these credits measured as the difference between the specific post-modification impairment reserve and the pre-modification reserve calculated under our general allowance for loan loss methodology.