Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 15, 2016	Jun. 30, 2018	Dec. 31, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost			$ 198,670
Available-for-sale securities, Gross Unrealized Gains			180
Available-for-sale securities, Gross Unrealized Losses			1,895
Available-for-sale securities, Estimated Fair Value		$ 176,218	196,955
Held-to-maturity securities, Amortized Cost		6,168	6,247
Held-to-maturity securities, Gross Unrealized Gains		24	144
Held-to-maturity securities, Gross Unrealized Losses		30
Held-to-maturity securities, Estimated Fair Value		6,162	6,391
Equity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost			666
Available-for-sale securities, Gross Unrealized Losses			8
Available-for-sale securities, Estimated Fair Value			658
Other Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost		3,000	3,000
Available-for-sale securities, Gross Unrealized Gains			76
Available-for-sale securities, Gross Unrealized Losses		20
Available-for-sale securities, Estimated Fair Value		2,980	3,076
Floating interest rate	6.50%
Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost		180,689
Available-for-sale securities, Gross Unrealized Gains		139
Available-for-sale securities, Gross Unrealized Losses		5,262
Available-for-sale securities, Estimated Fair Value		175,566
U.S. Government Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost		42,578	45,806
Available-for-sale securities, Gross Unrealized Gains		7	23
Available-for-sale securities, Gross Unrealized Losses		858	497
Available-for-sale securities, Estimated Fair Value		41,727	45,332
Held-to-maturity securities, Amortized Cost		1,766	1,844
Held-to-maturity securities, Gross Unrealized Gains			21
Held-to-maturity securities, Gross Unrealized Losses		10
Held-to-maturity securities, Estimated Fair Value		1,756	1,865
States and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Held-to-maturity securities, Amortized Cost		1,402	1,403
Held-to-maturity securities, Gross Unrealized Gains		24	47
Held-to-maturity securities, Estimated Fair Value		1,426	1,450
Mortgage-backed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale securities, Amortized Cost		138,111	152,198
Available-for-sale securities, Gross Unrealized Gains		132	157
Available-for-sale securities, Gross Unrealized Losses		4,404	1,390
Available-for-sale securities, Estimated Fair Value		$ 133,839	$ 150,965

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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