Consolidated Statement of Cash Flows - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income			$ 3,171	$ 2,460	$ 12,638	$ 11,626	$ 13,385
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses			750	120	1,520	480	585
Depreciation and amortization					320	464	472
Amortization and accretion on investment securities					2,302	2,057	2,133
Deferred income taxes					362	(192)	478
Investment securities gains, net			(100)	1	(255)	(429)	(616)
Earnings on bank owned life insurance					(688)	(628)	(507)
Stock awards					284	179	200
Originations of loans held for sale					(22,237)	(18,945)	(11,129)
Proceeds from sales of loans held for sale					21,462	19,243	11,146
Realized gains on loans sold					(449)	(404)	(236)
(Increase) decrease in accrued interest receivable					122	(285)	84
Decrease in accrued interest payable					(14)	(36)	(139)
Other, net					827	(319)	322
Net cash provided by operating activities					16,194	12,811	16,178
Available-for-sale securities:
Proceeds from sales of available-for-sale securities					22,372	30,464	28,989
Proceeds from maturity and principal repayments of securities					67,782	48,103	41,756
Purchase of securities					(55,600)	(111,304)	(56,257)
Proceeds from redemption of Regulatory Stock					1,556	4,476	4,706
Purchase of Regulatory Stock					(3,403)	(3,879)	(2,815)
Net increase in loans					(103,915)	(25,981)	(15,331)
Purchase of interest bearing time deposits					0	(500)	(3,480)
Proceeds from matured interest bearing time deposits with other banks					744	0	0
Purchase of bank owned life insurance					0	0	(5,123)
Purchase of premises, equipment and software					(587)	(776)	(1,309)
Proceeds from sale of foreclosed assets held for sale					973	565	647
Acquisition, net of cash paid					0	77,895	0
Net cash (used in) provided by investing activities					(70,078)	19,063	(8,217)
Cash Flows from Financing Activities:
Net (decrease) increase in deposits					17,472	(11,132)	25,617
Proceeds from long-term borrowings					543	5,291	6,820
Repayments of long-term borrowings					(534)	(700)	(4,200)
Net increase (decrease) in short-term borrowed funds					38,022	(4,759)	(27,753)
Purchase of treasury stock					(3,227)	(2,455)	(814)
Purchase of restricted stock					0	(7)	(170)
Reissuance of treasury stock to employee stock purchase plan					59	0	0
Dividends paid					(5,081)	(5,151)	(6,121)
Net cash provided by (used in) financing activities					47,254	(18,913)	(6,621)
Net (decrease) increase in cash and cash equivalents					(6,630)	12,961	1,340
Cash and Cash Equivalents at Beginning of Year					24,384	11,423	10,083
Cash and Cash Equivalents at End of Year		$ 24,384	17,754	24,384	17,754	24,384	11,423
Supplemental Disclosures of Cash Flow Information:
Interest paid					5,055	4,841	5,092
Income taxes paid					2,475	3,375	2,835
Non-cash activities:
Stock dividend					1,574	0	1,597
Real estate acquired in settlement of loans					599	323	1,095
Real estate transferred from other assets					0	0	549
Investments sold and not settled included in other assets					7,759	0	0
Non-cash assets acquired
Goodwill	[1]	21,089	21,089	21,089	21,089	21,089
First National Bank of Fredericksburg [Member]
Cash Flows from Operating Activities:
Net income		(22)
Non-cash assets acquired
Available-for-sale securities		23,831	0	23,831	0	23,831	0
Interest bearing time deposits with other banks		1,236	0	1,236	0	1,236	0
Loans		115,211	0	115,211	0	115,211	0
Premises and equipment		4,743	0	4,743	0	4,743	0
Accrued interest receivable		282	0	282	0	282	0
Bank-owned life insurance		4,598	0	4,598	0	4,598	0
Intangibles		1,981	0	1,981	0	1,981	0
Deferred tax asset		2,979	0	2,979	0	2,979	0
Other assets		2,332	0	2,332	0	2,332	0
Goodwill		10,833	0	10,833	0	10,833	0
Total Non-cash assets acquired		168,026	0	168,026	0	168,026	0
Liabilities assumed
Noninterest-bearing deposits		71,971	0	71,971	0	71,971	0
Interest-bearing deposits		153,259	0	153,259	0	153,259	0
Accrued interest payable		14	0	14	0	14	0
Other liabilities		4,693	0	4,693	0	4,693	0
Total liabilities assumed		229,937	0	229,937	0	229,937	0
Net non-cash liabilities acquired		(61,911)	0	(61,911)	0	(61,911)	0
Cash and cash equivalents acquired		$ 83,514	$ 0	$ 83,514	$ 0	$ 83,514	$ 0

[1] Excludes fully amortized intangible assets