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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Apr. 17, 2020
Dec. 31, 2019
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables $ 1,363,633,000   $ 1,363,633,000     $ 1,115,569,000
Individually evaluated for impairment 19,523,000   19,523,000     19,672,000
Loans acquired with deteriorated credit quality 6,003,000   6,003,000     1,282,000
Collectively evaluated for impairment 1,338,107,000   1,338,107,000     1,094,615,000
Allowance for loan losses 14,827,000   14,827,000     13,845,000
Individually evaluated for impairment 888,000   888,000     735,000
Allowance for loan losses related to loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 13,939,000   13,939,000     13,110,000
Net loans 1,348,806,000   1,348,806,000     1,101,724,000
Net loans, individually evaluated for impairment 18,635,000   18,635,000     18,937,000
Net loans, loans acquired with deteriorated credit quality 6,003,000   6,003,000     1,282,000
Net loans, collectively evaluated for impairment 1,324,168,000   1,324,168,000     1,081,505,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 21,202,000   21,202,000     21,220,000
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]            
Balance at beginning of period 88,000 $ 102,000 89,000 $ 104,000    
Acquisition of Midcoast 966,000 0 966,000 0    
Accretion (67,000) (2,000) (68,000) (4,000)    
Balance at end of period 987,000 $ 100,000 987,000 $ 100,000    
Loans acquired with specific evidence of deterioration in credit quality [Abstract]            
Outstanding balance 10,589,000   10,589,000     4,072,000
Carrying amount 6,003,000   $ 6,003,000     1,282,000
Minimum [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Number of days past for loan to be considered impaired, Minimum     90 days      
First Mortgage [Member] | Minimum [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Period of mortgage on real estate     15 years      
First Mortgage [Member] | Maximum [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Period of mortgage on real estate     30 years      
Second Mortgage [Member] | Maximum [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Period of mortgage on real estate     15 years      
Real Estate Loans [Member] | Residential [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 210,789,000   $ 210,789,000     217,088,000
Individually evaluated for impairment 1,194,000   1,194,000     1,166,000
Loans acquired with deteriorated credit quality 21,000   21,000     23,000
Collectively evaluated for impairment 209,574,000   209,574,000     215,899,000
Individually evaluated for impairment 30,000   30,000     32,000
Collectively evaluated for impairment 1,176,000   1,176,000     1,082,000
Real Estate Loans [Member] | Commercial [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 513,598,000   513,598,000     342,023,000
Individually evaluated for impairment 11,829,000   11,829,000     11,537,000
Loans acquired with deteriorated credit quality 3,820,000   3,820,000     1,210,000
Collectively evaluated for impairment 497,949,000   497,949,000     329,276,000
Individually evaluated for impairment 452,000   452,000     251,000
Collectively evaluated for impairment 4,492,000   4,492,000     4,298,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 12,402,000   12,402,000     12,070,000
Real Estate Loans [Member] | Agricultural [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 313,136,000   313,136,000     311,464,000
Individually evaluated for impairment 3,470,000   3,470,000     3,782,000
Loans acquired with deteriorated credit quality 1,781,000   1,781,000     0
Collectively evaluated for impairment 307,885,000   307,885,000     307,682,000
Individually evaluated for impairment 77,000   77,000     151,000
Collectively evaluated for impairment 4,984,000   4,984,000     4,871,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 3,628,000   3,628,000     3,900,000
Real Estate Loans [Member] | Construction [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 31,744,000   31,744,000     15,519,000
Individually evaluated for impairment 0   0     0
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 31,744,000   31,744,000     15,519,000
Individually evaluated for impairment 0   0     0
Collectively evaluated for impairment 81,000   81,000     43,000
Consumer [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 30,973,000   30,973,000     9,947,000
Individually evaluated for impairment 0   0     4,000
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 30,973,000   30,973,000     9,943,000
Individually evaluated for impairment 0   0     0
Collectively evaluated for impairment 362,000   362,000     112,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance           4,000
Other Commercial Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 132,503,000   132,503,000     69,970,000
Individually evaluated for impairment 1,741,000   1,741,000     1,902,000
Loans acquired with deteriorated credit quality 0   0     49,000
Collectively evaluated for impairment 130,762,000   130,762,000     68,019,000
Individually evaluated for impairment 175,000   175,000     147,000
Collectively evaluated for impairment 1,026,000   1,026,000     1,108,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 2,360,000   2,360,000     2,517,000
Other Agricultural Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 44,912,000   44,912,000     55,112,000
Individually evaluated for impairment 1,289,000   1,289,000     1,281,000
Loans acquired with deteriorated credit quality 381,000   381,000     0
Collectively evaluated for impairment 43,242,000   43,242,000     53,831,000
Individually evaluated for impairment 154,000   154,000     154,000
Collectively evaluated for impairment 667,000   667,000     807,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 1,377,000   1,377,000     1,347,000
State and Political Subdivision Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing/loan receivables 85,978,000   85,978,000     94,446,000
Individually evaluated for impairment 0   0     0
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 85,978,000   85,978,000     94,446,000
Individually evaluated for impairment 0   0     0
Collectively evaluated for impairment 547,000   547,000     $ 536,000
MidCoast Community Bancorp, Inc [Member]            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance         $ 8,005,000  
Purchase accounting adjustments related to purchased impaired loans [Abstract]            
Contractually required principal and interest at acquisition         8,801,000  
Non-accretable discount         (2,966,000)  
Expected cash flows         5,835,000  
Accretable discount         (966,000)  
Estimated fair value         $ 4,869,000  
Loans acquired with specific evidence of deterioration in credit quality [Abstract]            
Carrying amount $ 4,796,000   $ 4,796,000