Loans - Troubled Debt Restructuring (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($) item loan	Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($) loan	Dec. 31, 2015 USD ($)
Troubled Debt Restructurings (TDRs)
Total TDR loans	$ 7,000,000		$ 7,000,000		$ 6,600,000
Additional funds committed in connection with TDR loans	$ 0		$ 0
Number of restructurings (in loans) | loan	4	4	5	9
Pre-modification outstanding recorded investment	$ 511,000	$ 662,000	$ 521,000	$ 1,182,000
Post-modification outstanding recorded investment	511,000	662,000	521,000	1,182,000
Impact on allowance for loan losses	0	0	0	4,000
Charge-offs	0	$ 0	$ 0	$ 0
Troubled debt restructurings that subsequently defaulted within 12 months of restructuring
Number of TDR's that defaulted (in loans) | loan		2	3	5
Recorded investment		$ 47,000	$ 647,000	$ 526,000
Accrual status
Troubled Debt Restructurings (TDRs)
Total TDR loans	3,500,000		3,500,000		$ 3,500,000
Default status
Troubled Debt Restructurings (TDRs)
Charge-offs	0		20,000
TDR recorded investment reserves	$ 0		$ 12,000
Residential 1-4 family
Troubled Debt Restructurings (TDRs)
Number of restructurings (in loans)	1	1	1	2
Pre-modification outstanding recorded investment	$ 175,000	$ 200,000	$ 175,000	$ 488,000
Post-modification outstanding recorded investment	$ 175,000	$ 200,000	$ 175,000	$ 488,000
Troubled debt restructurings that subsequently defaulted within 12 months of restructuring
Number of TDR's that defaulted (in loans) | loan			3	2
Recorded investment			$ 647,000	$ 470,000
Home equity loans and lines of credit
Troubled Debt Restructurings (TDRs)
Number of restructurings (in loans) | loan	2	2	3	5
Pre-modification outstanding recorded investment	$ 286,000	$ 28,000	$ 296,000	$ 141,000
Post-modification outstanding recorded investment	$ 286,000	$ 28,000	$ 296,000	$ 141,000
Troubled debt restructurings that subsequently defaulted within 12 months of restructuring
Number of TDR's that defaulted (in loans) | loan		2		2
Recorded investment		$ 47,000		$ 47,000
Commercial real estate
Troubled Debt Restructurings (TDRs)
Number of restructurings (in loans) | loan				1
Pre-modification outstanding recorded investment				$ 119,000
Post-modification outstanding recorded investment				$ 119,000
SBA
Troubled Debt Restructurings (TDRs)
Number of restructurings (in loans) | loan	1	1	1	1
Pre-modification outstanding recorded investment	$ 50,000	$ 434,000	$ 50,000	$ 434,000
Post-modification outstanding recorded investment	$ 50,000	$ 434,000	$ 50,000	$ 434,000
Troubled debt restructurings that subsequently defaulted within 12 months of restructuring
Number of TDR's that defaulted (in loans) | loan				1
Recorded investment				$ 9,000