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Loans and Allowance for Loan Losses - ALL by Loan Classification (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | $ 4,719 | $ 4,354 | $ 3,880
All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 4,719 | 4,354 |
Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 4,459 | 4,096 |
Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 260 | 258 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 2,071 | 1,906 | 1,734
Commercial Real Estate [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 2,071 | 1,906 |
Commercial Real Estate [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,082 | 1,015 | 906
Consumer Real Estate [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 1,082 | 1,015 |
Consumer Real Estate [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Construction and Land Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 733 | 627 | 690
Construction and Land Development [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 733 | 627 |
Construction and Land Development [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 795 | 777 | 524
Commercial and Industrial [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 535 | 519 |
Commercial and Industrial [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 260 | 258 |
Consumer and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 38 | 29 | $ 26
Consumer and Other [Member] | Performing [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | 38 | 29 |
Consumer and Other [Member] | Impaired Loans [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan losses | $ 0 | $ 0 |

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