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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | $ 528,127,000 |  | $ 547,749,000 |  |  |
Valuation allowance | 9,297,000 | $ 9,872,000 | 9,326,000 | $ 9,214,000 | $ 10,136,000 | $ 9,610,000
Assets fair value nonrecurring | 194,000 |  |  |  |  |
Liabilities fair value nonrecurring | 0 |  | 0 |  |  |
Carrying Amount |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 528,127,000 |  | 547,749,000 |  |  |
Loans, net | 759,691,000 |  | 747,302,000 |  |  |
Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 528,127,000 |  | 547,749,000 |  |  |
Loans, net | 770,699,000 |  | 761,023,000 |  |  |
Valuation allowance | 0 |  | 263,000 |  |  |
Loans, charge-offs | 0 | 0 | 0 |  |  |
Consumer |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Valuation allowance | 793,000 | $ 948,000 | 852,000 | $ 775,000 | $ 894,000 | $ 734,000
Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 7,479,000 |  | 7,416,000 |  |  |
Loans, net | 0 |  | 0 |  |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 520,648,000 |  | 540,333,000 |  |  |
Loans, net | 0 |  | 0 |  |  |
Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Loans, net | 770,699,000 |  | 761,023,000 |  |  |
Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets | 194,000 |  | 362,000 |  |  |
Assets, fair value | 194,000 |  | 409,000 |  |  |
Nonrecurring | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Valuation allowance |  |  | 15,000 |  |  |
Nonrecurring | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 47,000 |  |  |
Nonrecurring | Impaired loans | Carrying Amount |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 62,000 |  |  |
Valuation allowance |  |  | 15,000 |  |  |
Nonrecurring | Impaired loans | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 47,000 |  |  |
Nonrecurring | Equity loans and lines of credit | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 47,000 |  |  |
Nonrecurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Assets, fair value | 0 |  | 0 |  |  |
Nonrecurring | Level 1 | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 0 |  |  |
Nonrecurring | Level 1 | Equity loans and lines of credit | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 0 |  |  |
Nonrecurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets | 0 |  | 0 |  |  |
Assets, fair value | 0 |  | 0 |  |  |
Nonrecurring | Level 2 | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 0 |  |  |
Nonrecurring | Level 2 | Equity loans and lines of credit | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 0 |  |  |
Nonrecurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets | 194,000 |  | 362,000 |  |  |
Assets, fair value | 194,000 |  | 409,000 |  |  |
Nonrecurring | Level 3 | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 47,000 |  |  |
Nonrecurring | Level 3 | Equity loans and lines of credit | Impaired loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 47,000 |  |  |
Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 528,127,000 |  | 547,749,000 |  |  |
Recurring | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 64,421,000 |  | 68,970,000 |  |  |
Recurring | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 225,010,000 |  | 290,299,000 |  |  |
Recurring | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 191,903,000 |  | 178,221,000 |  |  |
Recurring | Private label mortgage backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 39,314,000 |  | 2,843,000 |  |  |
Recurring | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 7,479,000 |  | 7,416,000 |  |  |
Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 7,479,000 |  | 7,416,000 |  |  |
Recurring | Level 1 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 1 | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Private label mortgage backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 7,479,000 |  | 7,416,000 |  |  |
Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 520,648,000 |  | 540,333,000 |  |  |
Recurring | Level 2 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 64,421,000 |  | 68,970,000 |  |  |
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 225,010,000 |  | 290,299,000 |  |  |
Recurring | Level 2 | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 191,903,000 |  | 178,221,000 |  |  |
Recurring | Level 2 | Private label mortgage backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 39,314,000 |  | 2,843,000 |  |  |
Recurring | Level 2 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |  |
Recurring | Level 3 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 3 | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Private label mortgage backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale investment securities | $ 0 |  | $ 0 |  |  |

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