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Fair Value Measurements (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Fund | Dec. 31, 2016 USD ($)
Fair Value Disclosures [Abstract] |  |
Number of mutual funds that invest in debt securities or loans that qualify for credit under the Community Reinvestment Act (in fund) | Fund | 3 |
Number of investments in mutual funds that are measured at fair value using net asset value per share as a practical expedient (in investments) | Fund | 2 |
Redemption notice required to be given to convert capital account, number of days | 60 days |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | $ 326,676 | $ 320,659
Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Total recurring fair value measurements | 326,676 | 320,659
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Total recurring fair value measurements | 34,055 | 28,870
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Total recurring fair value measurements | 291,130 | 290,307
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Total recurring fair value measurements | 0 | 0
Nonrecurring [Member] |  |
Nonrecurring fair value measurements: |  |
Impaired loans | 2,857 | 5,340
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Nonrecurring fair value measurements: |  |
Impaired loans | 0 | 0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Nonrecurring fair value measurements: |  |
Impaired loans | 0 | 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Nonrecurring fair value measurements: |  |
Impaired loans | 2,857 | 5,340
U.S. Treasury notes [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 33,305 | 28,145
U.S. Treasury notes [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 33,305 | 28,145
U.S. Treasury notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 33,305 | 28,145
U.S. Treasury notes [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
U.S. Treasury notes [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
U.S. Agency notes [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 90,325 | 85,400
U.S. Agency notes [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 90,325 | 85,400
U.S. Agency notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
U.S. Agency notes [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 90,325 | 85,400
U.S. Agency notes [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
U.S. Agency mortgage-backed securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 67,968 | 71,047
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 67,968 | 71,047
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 67,968 | 71,047
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Non-taxable Municipal securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 112,486 | 113,015
Non-taxable Municipal securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 112,486 | 113,015
Non-taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Non-taxable Municipal securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 112,486 | 113,015
Non-taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Taxable Municipal securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 19,351 | 19,845
Taxable Municipal securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 19,351 | 19,845
Taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Taxable Municipal securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 19,351 | 19,845
Taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Mutual funds [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 2,491 | 2,482
Mutual funds [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 1,000 | 1,000
Mutual funds [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Mutual funds [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 1,000 | 1,000
Mutual funds [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Mutual funds measured at net asset value [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 1,491 | 1,482
Trust preferred securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 49 | 48
Trust preferred securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 49 | 48
Trust preferred securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 49 | 48
Trust preferred securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Trust preferred securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Equity securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 701 | 677
Equity securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 701 | 677
Equity securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 701 | 677
Equity securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | 0 | 0
Equity securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Available-for-sale, at fair value | $ 0 | $ 0

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