Loans - Risk category of loans by class (Details 1) - Loans - USD ($)
$ in Thousands

Mar. 31, 2016

Dec. 31, 2015

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 206,326

$ 202,393

Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 204,765

$ 200,940

Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1,560

$ 1,452

Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

205,366

201,479

Real Estate Loans | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 203,806

$ 200,027

Real Estate Loans | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1,560

$ 1,452

Real Estate Loans | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Secured by one-to-four family residences

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 178,677

$ 177,037

Real Estate Loans | Secured by one-to-four family residences | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 177,414

$ 175,885

Real Estate Loans | Secured by one-to-four family residences | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Secured by one-to-four family residences | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1,263

$ 1,152

Real Estate Loans | Secured by one-to-four family residences | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Secured by multi-family residences

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 5,469

$ 5,146

Real Estate Loans | Secured by multi-family residences | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 5,469

$ 5,146

Real Estate Loans | Secured by multi-family residences | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Secured by multi-family residences | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Secured by multi-family residences | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Construction

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1,544

$ 1,251

Real Estate Loans | Construction | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1,544

$ 1,251

Real Estate Loans | Construction | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Construction | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Construction | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Commercial real estate

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 4,589

$ 3,522

Real Estate Loans | Commercial real estate | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 4,589

$ 3,522

Real Estate Loans | Commercial real estate | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Commercial real estate | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Commercial real estate | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Home equity lines of credit

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 15,087

$ 14,523

Real Estate Loans | Home equity lines of credit | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 14,790

$ 14,223

Real Estate Loans | Home equity lines of credit | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Real Estate Loans | Home equity lines of credit | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 297

$ 300

Real Estate Loans | Home equity lines of credit | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 960

$ 914

Other Loans Portfolio Segment | Commercial & industrial loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

896

853

Other Loans Portfolio Segment | Commercial & industrial loans | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 896

$ 853

Other Loans Portfolio Segment | Commercial & industrial loans | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment | Commercial & industrial loans | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment | Commercial & industrial loans | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment | Other loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 64

$ 61

Other Loans Portfolio Segment | Other loans | Pass

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 63

$ 60

Other Loans Portfolio Segment | Other loans | Special Mention

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment | Other loans | Substandard

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

Other Loans Portfolio Segment | Other loans | Doubtful

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans

$ 1