Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	$ 2,200	$ 2,160
Debt securities, available-for-sale, at fair value	247,437	275,213
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	99	99
Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	249,637	277,373
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	4,384	4,419
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	245,253	272,954
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	0	0
Nonrecurring [Member]
Recurring fair value measurement [Abstract]
Fair Value	998
Nonrecurring fair value measurements:
Impaired loans	963	3,359
Other real estate owned and repossessed assets	35
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Fair Value	0
Nonrecurring fair value measurements:
Impaired loans	0	0
Other real estate owned and repossessed assets	0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Fair Value	0
Nonrecurring fair value measurements:
Impaired loans	0	0
Other real estate owned and repossessed assets	0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Fair Value	998
Nonrecurring fair value measurements:
Impaired loans	963	3,359
Other real estate owned and repossessed assets	35
U.S. Treasury notes [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	2,184	2,259
U.S. Treasury notes [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	2,184	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	2,184	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 fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	77,172	83,261
U.S. Agency notes [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	77,172	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	77,172	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 fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	56,792	67,153
U.S. Agency mortgage-backed securities [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	56,792	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	56,792	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 fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	91,684	102,174
Non-taxable Municipal securities [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	91,684	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	91,684	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 fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	19,605	20,366
Taxable Municipal securities [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Debt securities, available-for-sale, at fair value	19,605	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	19,605	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 fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	1,547	1,542
Mutual funds [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	36
Equity securities with a readily determinable fair value:		23
Mutual funds [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	36
Equity securities with a readily determinable fair value:		23
Mutual funds [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Mutual funds [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Mutual funds measured at net asset value [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	1,511
Equity securities with a readily determinable fair value:		1,519
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	1,511
Equity securities with a readily determinable fair value:		1,519
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Trust preferred securities [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	50	50
Trust preferred securities [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	50
Equity securities with a readily determinable fair value:		50
Trust preferred securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	50
Equity securities with a readily determinable fair value:		50
Trust preferred securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Trust preferred securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Equity securities [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	603	568
Equity securities [Member] | Recurring [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	603
Equity securities with a readily determinable fair value:		568
Equity securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	603
Equity securities with a readily determinable fair value:		568
Equity securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	0
Equity securities with a readily determinable fair value:		0
Equity securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Recurring fair value measurement [Abstract]
Equity securities with a readily determinable fair value, at fair value	$ 0
Equity securities with a readily determinable fair value:		$ 0