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Investment Securities (Unrealized Gain (Loss) on Investments) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized Cost	$ 116,823,000	$ 95,648,000
Available-for-sale debt securities, Unrealized Gains	54,000	14,000
Available-for-sale debt securities, Unrealized Losses	6,350,000	2,703,000
Available for sale debt securities, Fair Value	110,527,000	92,959,000
Held-to-maturity debt securities, Amortized Cost	171,521,000	101,356,000
Held-to-maturity debt securities, Unrealized Gains	26,000	41,000
Held-to-maturity debt securities, Unrealized Losses	4,427,000	914,000
Held-to-maturity debt securities, Fair Value	167,120,000	100,483,000
Available-for-sale securities and Held-to-maturity debt securities, Amortized Cost	288,344,000	197,554,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Gains	80,000	55,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Losses	10,777,000	3,661,000
Available-for-sale securities and Held-to-maturity debt securities, Fair Value	277,647,000	193,948,000
Available-for-sale equity securities, Amortized Cost		550,000
Available-for-sale equity securities, Unrealized Losses		44,000
Available for sale equity securities, Fair Value	488,000	506,000
U.S. Treasury and U.S. government agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized Cost	40,590,000	40,125,000
Available-for-sale debt securities, Unrealized Losses	2,640,000	1,395,000
Available for sale debt securities, Fair Value	37,950,000	38,730,000
Held-to-maturity debt securities, Amortized Cost	16,480,000	10,984,000
Held-to-maturity debt securities, Unrealized Gains	5,000
Held-to-maturity debt securities, Unrealized Losses	261,000	90,000
Held-to-maturity debt securities, Fair Value	16,224,000	10,894,000
Mortgage-backed U.S. Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized Cost	41,677,000	26,398,000
Available-for-sale debt securities, Unrealized Gains		2,000
Available-for-sale debt securities, Unrealized Losses	1,490,000	569,000
Available for sale debt securities, Fair Value	40,187,000	25,831,000
Held-to-maturity debt securities, Amortized Cost	69,344,000	53,472,000
Held-to-maturity debt securities, Unrealized Gains	2,000
Held-to-maturity debt securities, Unrealized Losses	1,998,000	523,000
Held-to-maturity debt securities, Fair Value	67,348,000	52,949,000
State and political subdivision obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized Cost	33,306,000	27,775,000
Available-for-sale debt securities, Unrealized Gains	54,000	7,000
Available-for-sale debt securities, Unrealized Losses	2,213,000	739,000
Available for sale debt securities, Fair Value	31,147,000	27,043,000
Held-to-maturity debt securities, Amortized Cost	84,154,000	36,900,000
Held-to-maturity debt securities, Unrealized Gains	19,000	41,000
Held-to-maturity debt securities, Unrealized Losses	2,157,000	301,000
Held-to-maturity debt securities, Fair Value	82,016,000	36,640,000
Corporate debt securities [Member]
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized Cost	1,250,000	1,350,000
Available-for-sale debt securities, Unrealized Gains		5,000
Available-for-sale debt securities, Unrealized Losses	7,000
Available for sale debt securities, Fair Value	1,243,000	1,355,000
Held-to-maturity debt securities, Amortized Cost	1,543,000
Held-to-maturity debt securities, Unrealized Losses	11,000
Held-to-maturity debt securities, Fair Value	1,532,000
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale equity securities, Amortized Cost		550,000
Available-for-sale equity securities, Unrealized Losses		44,000
Available for sale equity securities, Fair Value	$ 488,000	$ 506,000

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