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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value $ 267,894 $ 275,213
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Equity Securities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Equity Securities 0 0
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Equity Securities 99 99
Recurring [Member]    
Recurring fair value measurement [Abstract]    
Total recurring fair value measurements 270,038 277,373
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Recurring fair value measurement [Abstract]    
Total recurring fair value measurements 4,362 4,419
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Recurring fair value measurement [Abstract]    
Total recurring fair value measurements 265,676 272,954
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 1,010 3,359
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 1,010 3,359
U.S. Treasury notes [Member] | Recurring [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 2,218 2,259
U.S. Treasury notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 2,218 2,259
U.S. Treasury notes [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, 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]    
Debt securities, available-for-sale, at fair value 0 0
U.S. Agency notes [Member] | Recurring [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 81,910 83,261
U.S. Agency notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, 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]    
Debt securities, available-for-sale, at fair value 81,910 83,261
U.S. Agency notes [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 0 0
U.S. Agency mortgage-backed securities [Member] | Recurring [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 63,223 67,153
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]    
Debt securities, 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]    
Debt securities, available-for-sale, at fair value 63,223 67,153
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 0 0
Non-taxable Municipal securities [Member] | Recurring [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 100,706 102,174
Non-taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, 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]    
Debt securities, available-for-sale, at fair value 100,706 102,174
Non-taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 0 0
Taxable Municipal securities [Member] | Recurring [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 19,837 20,366
Taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, 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]    
Debt securities, available-for-sale, at fair value 19,837 20,366
Taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Recurring fair value measurement [Abstract]    
Debt securities, available-for-sale, at fair value 0 0
Mutual funds [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 39 23
Mutual funds [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 39 23
Mutual funds [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Mutual funds [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Mutual funds measured at net asset value [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 1,509 1,519
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 1,509 1,519
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Trust preferred securities [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 50 50
Trust preferred securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 50 50
Trust preferred securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Trust preferred securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Equity securities [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 546 568
Equity securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 546 568
Equity securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Equity securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities $ 0 $ 0