Loans, Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 37,620	$ 35,650	$ 33,760	$ 37,810
Charge-offs	(874)	(736)	(2,482)	(1,955)
Recoveries	471	512	1,282	1,357
Provision	(157)	144	4,500	(1,642)
Ending balance	37,060	35,570	37,060	35,570
Ending balance, individually evaluated for impairment	745	1,417	745	1,417
Ending balance, collectively evaluated for impairment	36,315	34,153	36,315	34,153
Loan [Abstract]
Total Loans Receivable	2,767,125	2,637,938	2,767,125	2,637,938	$ 2,639,104
Ending balance, individually evaluated for impairment	28,672	19,388	28,672	19,388
Ending balance, collectively evaluated for impairment	2,738,453	2,618,550	2,738,453	2,618,550
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,547	2,535	2,400	2,789
Charge-offs	(8)	(135)	(43)	(135)
Recoveries	26	18	44	87
Provision	30	288	194	(35)
Ending balance	2,595	2,706	2,595	2,706
Ending balance, individually evaluated for impairment	80	341	80	341
Ending balance, collectively evaluated for impairment	2,515	2,365	2,515	2,365
Loan [Abstract]
Total Loans Receivable	96,321	91,621	96,321	91,621	91,317
Ending balance, individually evaluated for impairment	1,742	1,865	1,742	1,865
Ending balance, collectively evaluated for impairment	94,579	89,756	94,579	89,756
Commercial and Financial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	5,777	5,603	4,988	5,826
Charge-offs	(478)	(177)	(1,253)	(641)
Recoveries	165	128	374	451
Provision	(119)	(143)	1,236	(225)
Ending balance	5,345	5,411	5,345	5,411
Ending balance, individually evaluated for impairment	477	1,008	477	1,008
Ending balance, collectively evaluated for impairment	4,868	4,403	4,868	4,403
Loan [Abstract]
Total Loans Receivable	335,463	219,362	335,463	219,362	221,323
Ending balance, individually evaluated for impairment	5,949	3,176	5,949	3,176
Ending balance, collectively evaluated for impairment	329,514	216,186	329,514	216,186
Real Estate: Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,433	2,646	2,599	3,292
Charge-offs	0	0	(43)	(9)
Recoveries	27	2	81	6
Provision	(167)	240	(344)	(401)
Ending balance	2,293	2,888	2,293	2,888
Ending balance, individually evaluated for impairment	87	0	87	0
Ending balance, collectively evaluated for impairment	2,206	2,888	2,206	2,888
Loan [Abstract]
Total Loans Receivable	184,797	189,631	184,797	189,631
Ending balance, individually evaluated for impairment	7,933	456	7,933	456
Ending balance, collectively evaluated for impairment	176,864	189,175	176,864	189,175
Real Estate: Mortgage, farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,089	3,891	3,950	3,972
Charge-offs	0	0	(1)	0
Recoveries	0	0	0	5
Provision	(41)	96	99	10
Ending balance	4,048	3,987	4,048	3,987
Ending balance, individually evaluated for impairment	1	0	1	0
Ending balance, collectively evaluated for impairment	4,047	3,987	4,047	3,987
Loan [Abstract]
Total Loans Receivable	243,689	237,513	243,689	237,513	$ 242,730
Ending balance, individually evaluated for impairment	2,440	4,117	2,440	4,117
Ending balance, collectively evaluated for impairment	241,249	233,396	241,249	233,396
Real Estate: Mortgage, 1 to 4 family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	12,282	11,384	10,638	12,516
Charge-offs	(115)	(332)	(576)	(711)
Recoveries	201	317	636	576
Provision	(210)	(166)	1,460	(1,178)
Ending balance	12,158	11,203	12,158	11,203
Ending balance, individually evaluated for impairment	86	65	86	65
Ending balance, collectively evaluated for impairment	12,072	11,138	12,072	11,138
Loan [Abstract]
Total Loans Receivable	1,031,701	1,063,175	1,031,701	1,063,175
Ending balance, individually evaluated for impairment	6,980	7,729	6,980	7,729
Ending balance, collectively evaluated for impairment	1,024,721	1,055,446	1,024,721	1,055,446
Real Estate: Mortgage, multi-family and commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	9,173	8,194	7,859	8,165
Charge-offs	(210)	0	(290)	(133)
Recoveries	10	12	33	100
Provision	320	(110)	1,691	(36)
Ending balance	9,293	8,096	9,293	8,096
Ending balance, individually evaluated for impairment	0	1	0	1
Ending balance, collectively evaluated for impairment	9,293	8,095	9,293	8,095
Loan [Abstract]
Total Loans Receivable	788,209	751,993	788,209	751,993
Ending balance, individually evaluated for impairment	3,614	2,043	3,614	2,043
Ending balance, collectively evaluated for impairment	784,595	749,950	784,595	749,950
Others [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,319	1,397	1,326	1,250
Charge-offs	(63)	(92)	(276)	(326)
Recoveries	42	35	114	132
Provision	30	(61)	164	223
Ending balance	1,328	1,279	1,328	1,279
Ending balance, individually evaluated for impairment	14	2	14	2
Ending balance, collectively evaluated for impairment	1,314	1,277	1,314	1,277
Loan [Abstract]
Total Loans Receivable	86,945	84,643	86,945	84,643
Ending balance, individually evaluated for impairment	14	2	14	2
Ending balance, collectively evaluated for impairment	$ 86,931	$ 84,641	$ 86,931	$ 84,641