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Amount of first loss position maintained by Federal Home Loan Bank under Mortgage Partnership Finance Program.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. Related to Collectively evaluated for impairment.

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The number of days past due before a loan is classified as impaired.

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Real estate loans serviced for Freddie Mac and Fannie Mae, which are not included in the consolidated balance sheet.

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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 11, 2015
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			$ 1,081,883	$ 1,000,525
Individually evaluated for impairment			23,450	24,398
Loans acquired with deteriorated credit quality			1,859	2,638
Collectively evaluated for impairment			1,056,574	973,489
Allowance for loan losses			12,884	11,190
Allowance for loan losses related to individually evaluated for impairment			676	410	$ 487
Allowance for loan losses related to loans acquired with deteriorated credit quality			0	0
Allowance for loan losses related to collectively evaluated for impairment			12,208	10,780	8,399
Net loans			1,068,999	989,335
Net loans, individually evaluated for impairment			22,774	23,988
Net loans, loans acquired with deteriorated credit quality			1,859	2,638
Net loans, collectively evaluated for impairment			1,044,366	962,709
Net unamortized loan fees and costs			918	794
Real estate loans serviced for Freddie Mac and Fannie Mae			142,072	142,972
Real estate loans sold to Freddie Mac and Fannie Mae without recourse	$ 122,219	$ 114,643
Portfolio balance under MPF			24,853	28,329
First-loss position for MPF maintained by FHLB			133
Credit enhancement for MPF by FHLB	$ 856
Number of days past for loan to be considered impaired, Minimum	90 days
Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Number of days past for loan to be considered impaired, Minimum	90 days
First Mortgage [Member] \| Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	15 years
First Mortgage [Member] \| Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	30 years
Second Mortgage [Member] \| Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate	15 years
Real Estate Loans [Member] \| Residential [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			215,305	214,479
Individually evaluated for impairment			890	1,065
Loans acquired with deteriorated credit quality			28	33
Collectively evaluated for impairment			214,387	213,381
Allowance for loan losses related to individually evaluated for impairment			24	56	32
Allowance for loan losses related to collectively evaluated for impairment			1,081	993	1,032
Real Estate Loans [Member] \| Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			319,265	308,084
Individually evaluated for impairment			13,327	13,864
Loans acquired with deteriorated credit quality			1,321	1,460
Collectively evaluated for impairment			304,617	292,760
Allowance for loan losses related to individually evaluated for impairment			216	94	45
Allowance for loan losses related to collectively evaluated for impairment			3,899	3,773	3,544
Real Estate Loans [Member] \| Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			284,520	239,957
Individually evaluated for impairment			5,592	3,901
Loans acquired with deteriorated credit quality			0	702
Collectively evaluated for impairment			278,928	235,354
Allowance for loan losses related to individually evaluated for impairment			84	3	54
Allowance for loan losses related to collectively evaluated for impairment			4,180	3,140	1,440
Real Estate Loans [Member] \| Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			33,913	13,502
Individually evaluated for impairment			0	0
Loans acquired with deteriorated credit quality			0	0
Collectively evaluated for impairment			33,913	13,502
Allowance for loan losses related to individually evaluated for impairment			0	0	0
Allowance for loan losses related to collectively evaluated for impairment			58	23	47
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			9,858	9,944
Individually evaluated for impairment			0	8
Loans acquired with deteriorated credit quality			0	0
Collectively evaluated for impairment			9,858	9,936
Allowance for loan losses related to individually evaluated for impairment			0	0	0
Allowance for loan losses related to collectively evaluated for impairment			120	124	122
Other Commercial Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			74,118	72,013
Individually evaluated for impairment			2,206	4,197
Loans acquired with deteriorated credit quality			510	443
Collectively evaluated for impairment			71,402	67,373
Allowance for loan losses related to individually evaluated for impairment			193	231	326
Allowance for loan losses related to collectively evaluated for impairment			1,161	1,041	1,001
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			42,186	37,809
Individually evaluated for impairment			1,435	1,363
Loans acquired with deteriorated credit quality			0	0
Collectively evaluated for impairment			40,751	36,446
Allowance for loan losses related to individually evaluated for impairment			159	26	30
Allowance for loan losses related to collectively evaluated for impairment			593	466	282
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables			102,718	104,737
Individually evaluated for impairment			0	0
Loans acquired with deteriorated credit quality			0	0
Collectively evaluated for impairment			102,718	104,737
Allowance for loan losses related to individually evaluated for impairment			0	0	0
Allowance for loan losses related to collectively evaluated for impairment			762	816	833
First National Bank of Fredericksburg [Member]
Components of the purchase accounting adjustments related to the purchased impaired loans in FNB Acquisition [Abstract]
Estimated fair value						$ 3,809
Contractually required principal and interest at acquisition						9,913
Expected cash flows						4,474
Non-accretable discount						5,439
Accretable discount	$ 106	389	104	106	$ 389	665
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]
Balance at beginning of period	106	389
Accretion	(95)	(632)
Reclassification of non-accretable discount	93	349
Balance at end of period	$ 104	$ 106
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Outstanding balance			4,529	5,295		$ 6,969
Carrying amount			$ 1,859	$ 2,638