Loans, Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 38,340	$ 36,520	$ 33,760	$ 37,810
Charge-offs	(1,167)	(742)	(1,607)	(1,219)
Recoveries	439	412	810	845
Provision	8	(540)	4,657	(1,786)
Ending balance	37,620	35,650	37,620	35,650
Ending balance, individually evaluated for impairment	991	1,383	991	1,383
Ending balance, collectively evaluated for impairment	36,629	34,267	36,629	34,267
Loan [Abstract]
Total Loans Receivable	2,752,891	2,638,617	2,752,891	2,638,617	$ 2,639,104
Ending balance, individually evaluated for impairment	21,301	19,851	21,301	19,851
Ending balance, collectively evaluated for impairment	2,731,590	2,618,766	2,731,590	2,618,766
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,760	2,541	2,400	2,789
Charge-offs	(31)	0	(35)	0
Recoveries	8	59	19	69
Provision	(190)	(65)	163	(323)
Ending balance	2,547	2,535	2,547	2,535
Ending balance, individually evaluated for impairment	94	213	94	213
Ending balance, collectively evaluated for impairment	2,453	2,322	2,453	2,322
Loan [Abstract]
Total Loans Receivable	94,101	91,215	94,101	91,215	91,317
Ending balance, individually evaluated for impairment	2,035	1,930	2,035	1,930
Ending balance, collectively evaluated for impairment	92,066	89,285	92,066	89,285
Commercial and Financial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	6,680	6,004	4,988	5,826
Charge-offs	(760)	(284)	(775)	(464)
Recoveries	101	139	209	323
Provision	(244)	(256)	1,355	(82)
Ending balance	5,777	5,603	5,777	5,603
Ending balance, individually evaluated for impairment	747	1,059	747	1,059
Ending balance, collectively evaluated for impairment	5,030	4,544	5,030	4,544
Loan [Abstract]
Total Loans Receivable	335,784	225,990	335,784	225,990	221,323
Ending balance, individually evaluated for impairment	2,575	4,213	2,575	4,213
Ending balance, collectively evaluated for impairment	333,209	221,777	333,209	221,777
Real Estate: Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,621	2,928	2,599	3,292
Charge-offs	(43)	(1)	(43)	(9)
Recoveries	53	2	54	4
Provision	(198)	(283)	(177)	(641)
Ending balance	2,433	2,646	2,433	2,646
Ending balance, individually evaluated for impairment	6	0	6	0
Ending balance, collectively evaluated for impairment	2,427	2,646	2,427	2,646
Loan [Abstract]
Total Loans Receivable	188,183	172,740	188,183	172,740
Ending balance, individually evaluated for impairment	1,614	458	1,614	458
Ending balance, collectively evaluated for impairment	186,569	172,282	186,569	172,282
Real Estate: Mortgage, farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,096	3,871	3,950	3,972
Charge-offs	(1)	0	(1)	0
Recoveries	0	0	0	5
Provision	(6)	20	140	(86)
Ending balance	4,089	3,891	4,089	3,891
Ending balance, individually evaluated for impairment	3	0	3	0
Ending balance, collectively evaluated for impairment	4,086	3,891	4,086	3,891
Loan [Abstract]
Total Loans Receivable	246,781	238,779	246,781	238,779	$ 242,730
Ending balance, individually evaluated for impairment	2,948	4,170	2,948	4,170
Ending balance, collectively evaluated for impairment	243,833	234,609	243,833	234,609
Real Estate: Mortgage, 1 to 4 family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	11,752	11,630	10,638	12,516
Charge-offs	(231)	(202)	(460)	(379)
Recoveries	247	149	434	259
Provision	514	(193)	1,670	(1,012)
Ending balance	12,282	11,384	12,282	11,384
Ending balance, individually evaluated for impairment	140	70	140	70
Ending balance, collectively evaluated for impairment	12,142	11,314	12,142	11,314
Loan [Abstract]
Total Loans Receivable	1,029,876	1,069,126	1,029,876	1,069,126
Ending balance, individually evaluated for impairment	8,263	6,956	8,263	6,956
Ending balance, collectively evaluated for impairment	1,021,613	1,062,170	1,021,613	1,062,170
Real Estate: Mortgage, multi-family and commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	9,063	8,223	7,859	8,165
Charge-offs	(78)	(129)	(80)	(133)
Recoveries	9	2	23	88
Provision	179	98	1,371	74
Ending balance	9,173	8,194	9,173	8,194
Ending balance, individually evaluated for impairment	1	1	1	1
Ending balance, collectively evaluated for impairment	9,172	8,193	9,172	8,193
Loan [Abstract]
Total Loans Receivable	772,322	756,869	772,322	756,869
Ending balance, individually evaluated for impairment	3,866	2,084	3,866	2,084
Ending balance, collectively evaluated for impairment	768,456	754,785	768,456	754,785
Others [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,368	1,323	1,326	1,250
Charge-offs	(23)	(126)	(213)	(234)
Recoveries	21	61	71	97
Provision	(47)	139	135	284
Ending balance	1,319	1,397	1,319	1,397
Ending balance, individually evaluated for impairment	0	40	0	40
Ending balance, collectively evaluated for impairment	1,319	1,357	1,319	1,357
Loan [Abstract]
Total Loans Receivable	85,844	83,898	85,844	83,898
Ending balance, individually evaluated for impairment	0	40	0	40
Ending balance, collectively evaluated for impairment	$ 85,844	$ 83,858	$ 85,844	$ 83,858