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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 529,240,000 |  | $ 547,749,000 |
Valuation allowance | 9,214,000 | $ 10,136,000 | 9,326,000 | $ 9,610,000
Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable | 755,176,000 |  | 747,302,000 |
Available-for-sale securities | 529,240,000 |  | 547,749,000 |
Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable | 757,064,000 |  | 761,023,000 |
Available-for-sale securities | 529,240,000 |  | 547,749,000 |
Valuation allowance | 0 |  | 635,000 |
Loans, charge-offs | 0 | 0 | 0 |
Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other repossessed assets | 262,000 |  | 362,000 |
Assets, fair value | 262,000 |  | 409,000 |
Nonrecurring | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Valuation allowance |  |  | 15,000 |
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 529,240,000 |  | 547,749,000 |
U.S. Government agencies | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 66,538,000 |  | 68,970,000 |
Obligations of states and political subdivisions | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 269,935,000 |  | 290,299,000 |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 182,643,000 |  | 178,221,000 |
Private label residential mortgage backed securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,708,000 |  | 2,843,000 |
Other equity securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 7,416,000 |  | 7,416,000 |
Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 47,000 |
Impaired loans | Nonrecurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 62,000 |
Valuation allowance |  |  | 15,000 |
Impaired loans | Nonrecurring | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 47,000 |
Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 47,000 |
Consumer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Valuation allowance | 775,000 | $ 894,000 | 852,000 | $ 734,000
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable | 0 |  | 0 |
Available-for-sale securities | 7,416,000 |  | 7,416,000 |
Level 1 | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other repossessed assets | 0 |  | 0 |
Assets, fair value | 0 |  | 0 |
Level 1 | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 7,416,000 |  | 7,416,000 |
Level 1 | U.S. Government agencies | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 1 | Obligations of states and political subdivisions | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 1 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 1 | Private label residential mortgage backed securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 1 | Other equity securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 7,416,000 |  | 7,416,000 |
Level 1 | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 0 |
Level 1 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 0 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable | 0 |  | 0 |
Available-for-sale securities | 521,824,000 |  | 540,333,000 |
Level 2 | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other repossessed assets | 0 |  | 0 |
Assets, fair value | 0 |  | 0 |
Level 2 | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 521,824,000 |  | 540,333,000 |
Level 2 | U.S. Government agencies | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 66,538,000 |  | 68,970,000 |
Level 2 | Obligations of states and political subdivisions | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 269,935,000 |  | 290,299,000 |
Level 2 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 182,643,000 |  | 178,221,000 |
Level 2 | Private label residential mortgage backed securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,708,000 |  | 2,843,000 |
Level 2 | Other equity securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 2 | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 0 |
Level 2 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 0 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable | 757,064,000 |  | 761,023,000 |
Available-for-sale securities | 0 |  | 0 |
Level 3 | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other repossessed assets | 262,000 |  | 362,000 |
Assets, fair value | 262,000 |  | 409,000 |
Level 3 | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 0 |  | 0 |
Level 3 | U.S. Government agencies | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 3 | Obligations of states and political subdivisions | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 3 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 3 | Private label residential mortgage backed securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 |  | 0 |
Level 3 | Other equity securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 0 |  | 0 |
Level 3 | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | 47,000 |
Level 3 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans receivable |  |  | $ 47,000 |

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