Loans, Past Due Receivables (Details) $ in Thousands	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of accruing loans past due 90 days or more	7	8
Schedule of past due loans [Abstract]
Total Past Due	$ 17,075	$ 12,963
Current	2,485,797	2,446,708
Total Loans Receivable	2,502,872	2,459,671	$ 2,370,699
Accruing Loans Past Due 90 Days or More	1,000	971
Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,198	593
Current	79,973	87,987
Total Loans Receivable	81,171	88,580	80,434
Accruing Loans Past Due 90 Days or More	0	0
Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,408	560
Current	218,285	218,072
Total Loans Receivable	219,693	218,632	203,150
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	706	0
Current	68,212	69,738
Total Loans Receivable	68,918	69,738
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	4,354	246
Current	111,098	109,349
Total Loans Receivable	115,452	109,595
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	758	269
Current	226,366	215,017
Total Loans Receivable	227,124	215,286	$ 207,412
Accruing Loans Past Due 90 Days or More	516	0
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	5,244	9,832
Current	857,574	821,759
Total Loans Receivable	862,818	831,591
Accruing Loans Past Due 90 Days or More	430	971
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	145	695
Current	147,873	143,505
Total Loans Receivable	148,018	144,200
Accruing Loans Past Due 90 Days or More	54	0
Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	693	0
Current	317,551	336,810
Total Loans Receivable	318,244	336,810
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	2,370	501
Current	378,492	360,695
Total Loans Receivable	380,862	361,196
Accruing Loans Past Due 90 Days or More	0	0
Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	199	267
Current	26,408	26,150
Total Loans Receivable	26,607	26,417
Accruing Loans Past Due 90 Days or More	0	0
State and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
Current	53,965	57,626
Total Loans Receivable	53,965	57,626
Accruing Loans Past Due 90 Days or More	0	0
30 - 59 Days Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	10,162	7,521
30 - 59 Days Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,003	324
30 - 59 Days Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	484	447
30 - 59 Days Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	344	0
30 - 59 Days Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	4,295	246
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	242	269
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,087	5,143
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	66	579
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	665	0
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,875	307
30 - 59 Days Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	101	206
30 - 59 Days Past Due [Member] | State and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	2,982	2,119
60 - 89 Days Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	860	20
60 - 89 Days Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	362	0
60 - 89 Days Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	59	0
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,227	1,750
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	25	116
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	351	178
60 - 89 Days Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	98	55
60 - 89 Days Past Due [Member] | State and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	3,931	3,323
90 Days or More Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	195	269
90 Days or More Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	64	93
90 Days or More Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	516	0
90 Days or More Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	2,930	2,939
90 Days or More Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	54	0
90 Days or More Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	28	0
90 Days or More Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	144	16
90 Days or More Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	6
90 Days or More Past Due [Member] | State and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	$ 0	$ 0