Loans, Past Due (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Recorded investment of past due [Abstract]
PCI	$ 3,944	$ 4,875
Total financing receivables	1,415,109	1,405,281
90 Days or greater and accruing	49	525
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	5,033	6,401
Current and non-accrual	4,049	4,331
PCI Loans considered non accrual	0	0
Financing receivable nonaccrual status	9,082	10,732
Financing receivables on accrual status [Abstract]
Total past due and still accruing	1,543	4,645
Current and still accruing	1,400,540	1,385,029
PCI Loans still accruing	3,944	4,875
Total financing receivables and still accruing	$ 1,406,027	1,394,549
Minimum [Member]
Financing receivables on nonaccrual status [Abstract]
Period of past due after which loans considered as non accrual	90 days
Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	$ 6,576	11,046
30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	1,651	6,256
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	426	3,032
Financing receivables on accrual status [Abstract]
Total past due and still accruing	1,225	3,224
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	2,261	924
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	1,992	28
Financing receivables on accrual status [Abstract]
Total past due and still accruing	269	896
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	2,664	3,866
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	2,615	3,341
Financing receivables on accrual status [Abstract]
Total past due and still accruing	49	525
Current [Member]
Recorded investment of past due [Abstract]
Past due	1,404,589	1,389,360
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
PCI	19	20
Total financing receivables	149,747	146,902
90 Days or greater and accruing	37	252
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	542	787
Real Estate Loans [Member] | Mortgages [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	652	1,796
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	415	864
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	30	414
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	207	518
Real Estate Loans [Member] | Mortgages [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	149,076	145,086
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
PCI	0	0
Total financing receivables	52,424	55,009
90 Days or greater and accruing	2	23
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	19	25
Real Estate Loans [Member] | Home Equity [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	98	248
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	81	152
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	9	62
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	8	34
Real Estate Loans [Member] | Home Equity [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	52,326	54,761
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
PCI	2,235	2,937
Total financing receivables	641,633	596,255
90 Days or greater and accruing	10	70
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	3,699	4,529
Real Estate Loans [Member] | Commercial [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	3,276	3,097
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	667	836
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	1,340	439
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	1,269	1,822
Real Estate Loans [Member] | Commercial [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	636,122	590,221
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
PCI	1,647	1,686
Total financing receivables	310,274	315,158
90 Days or greater and accruing	0	150
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	3,039	3,133
Real Estate Loans [Member] | Agricultural [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	1,552	3,612
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	329	2,283
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	43	0
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	1,180	1,329
Real Estate Loans [Member] | Agricultural [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	307,075	309,860
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
PCI	0	0
Total financing receivables	63,065	35,404
90 Days or greater and accruing	0	0
Real Estate Loans [Member] | Construction [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	0	0
Real Estate Loans [Member] | Construction [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	63,065	35,404
Consumer [Member]
Recorded investment of past due [Abstract]
PCI	0	0
Total financing receivables	8,684	30,277
90 Days or greater and accruing	0	30
Consumer [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	162	186
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	159	147
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	3	9
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	0	30
Consumer [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	8,522	30,091
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
PCI	43	232
Total financing receivables	104,349	114,169
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	884	1,284
Other Commercial Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	832	1,063
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	930
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	832	0
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	0	133
Other Commercial Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	103,474	112,874
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
PCI	0	0
Total financing receivables	33,720	48,779
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	899	974
Other Agricultural Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	4	1,044
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	1,044
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	4	0
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	0	0
Other Agricultural Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	33,716	47,735
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
PCI	0	0
Total financing receivables	51,213	63,328
90 Days or greater and accruing	0	0
State and Political Subdivision Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Past due	0	0
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Past due	0	0
State and Political Subdivision Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Past due	$ 51,213	$ 63,328