Loans, Past Due (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Recorded investment of past due [Abstract]
Total past due	$ 12,100	$ 9,730
Current	1,348,425	1,104,557
PCI	5,354	1,282
Total loan receivables	1,365,879	1,115,569
90 Days or greater and accruing	1,194	487
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	7,459	6,532
Current and non-accrual	4,252	5,004
PCI Loans considered non accrual	0
Financing receivable nonaccrual status	11,711	11,536
Financing receivables on accrual status [Abstract]
Total past due and still accruing	4,641	3,198
Current and still accruing	1,344,173	1,099,553
PCI Loans still accruing	5,354	1,282
Total financing receivables and still accruing	$ 1,354,168	1,104,033
Minimum [Member]
Financing receivables on nonaccrual status [Abstract]
Period of past due after which loans considered as non accrual	90 days
30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	$ 2,923	2,142
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	53	90
Financing receivables on accrual status [Abstract]
Total past due and still accruing	2,870	2,052
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	577	754
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	0	95
Financing receivables on accrual status [Abstract]
Total past due and still accruing	577	659
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	8,600	6,834
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	7,406	6,347
Financing receivables on accrual status [Abstract]
Total past due and still accruing	1,194	487
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
Total past due	1,755	957
Current	148,882	156,098
PCI	20	23
Total loan receivables	150,657	157,078
90 Days or greater and accruing	622	1
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	844	903
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	736	581
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	208	57
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	811	319
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
Total past due	161	401
Current	57,266	59,609
PCI	0	0
Total loan receivables	57,427	60,010
90 Days or greater and accruing	0	1
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	20	59
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	100	334
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	43	11
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	18	56
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
Total past due	6,534	5,043
Current	525,616	335,770
PCI	3,306	1,210
Total loan receivables	535,456	342,023
90 Days or greater and accruing	413	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	5,141	5,080
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	1,651	750
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	78	573
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	4,805	3,720
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
Total past due	1,658	903
Current	307,322	310,561
PCI	1,722	0
Total loan receivables	310,702	311,464
90 Days or greater and accruing	147	299
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	3,161	2,578
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	116	118
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	215	0
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	1,327	785
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Current	28,656	15,519
PCI	0	0
Total loan receivables	28,656	15,519
90 Days or greater and accruing	0	0
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Consumer [Member]
Recorded investment of past due [Abstract]
Total past due	187	131
Current	30,438	9,816
PCI	0	0
Total loan receivables	30,625	9,947
90 Days or greater and accruing	12	2
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	0	6
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	142	113
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	33	10
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	12	8
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
Total past due	1,660	2,234
Current	128,071	67,687
PCI	0	49
Total loan receivables	129,731	69,970
90 Days or greater and accruing	0	184
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,551	1,837
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	169	217
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	71
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	1,491	1,946
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
Total past due	145	61
Current	40,339	55,051
PCI	306	0
Total loan receivables	40,790	55,112
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	994	1,073
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	9	29
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	32
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	136	0
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Current	81,835	94,446
PCI	0	0
Total loan receivables	81,835	94,446
90 Days or greater and accruing	0	0
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	$ 0	$ 0