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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Apr. 17, 2020
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables $ 1,415,109,000   $ 1,415,109,000   $ 1,405,281,000  
Individually evaluated for impairment 16,022,000   16,022,000   17,277,000  
Loans acquired with deteriorated credit quality 3,944,000   3,944,000   4,875,000  
Collectively evaluated for impairment 1,395,143,000   1,395,143,000   1,383,129,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Allowance for loan losses 16,931,000   16,931,000   15,815,000  
Individually evaluated for impairment 269,000   269,000   510,000  
Allowance for loan losses related to loans acquired with deteriorated credit quality 0   0   0  
Collectively evaluated for impairment 16,662,000   16,662,000   15,305,000  
Loans and Leases Receivable, Net Amount [Abstract]            
Net loans 1,398,178,000   1,398,178,000   1,389,466,000  
Net loans, individually evaluated for impairment 15,753,000   15,753,000   16,767,000  
Net loans, loans acquired with deteriorated credit quality 3,944,000   3,944,000   4,875,000  
Net loans, collectively evaluated for impairment 1,378,481,000   1,378,481,000   1,367,824,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 18,121,000   18,121,000   19,050,000  
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]            
Balance at beginning of period 688,000 $ 88,000 788,000 $ 89,000    
Acquisition of Midcoast 0 966,000 0 966,000    
Accretion (104,000) (67,000) (204,000) (68,000)    
Balance at end of period 584,000 $ 987,000 584,000 $ 987,000    
Loans acquired with specific evidence of deterioration in credit quality [Abstract]            
Outstanding balance 7,092,000   7,092,000   8,958,000  
Carrying amount 3,944,000   3,944,000   4,875,000  
COVID-19 [Member]            
Loans and Leases Receivable, Net Amount [Abstract]            
Outstanding principal balances 27,100,000   27,100,000   37,200,000  
Loans originated     24,300,000      
Loans outstanding     23,200,000      
Maximum amount of loan forgiven by guidance from SBA     150,000      
Proceeds from loans receivable 1,600,000   1,600,000      
Deferred fees 1,400,000   $ 1,400,000      
Minimum [Member]            
Loans and Leases Receivable, Net Amount [Abstract]            
Number of days past for loan to be considered impaired, Minimum     90 days      
First Mortgage [Member] | Minimum [Member]            
Loans and Leases Receivable, Net Amount [Abstract]            
Period of mortgage on real estate     15 years      
First Mortgage [Member] | Maximum [Member]            
Loans and Leases Receivable, Net Amount [Abstract]            
Period of mortgage on real estate     30 years      
Second Mortgage [Member] | Maximum [Member]            
Loans and Leases Receivable, Net Amount [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 receivables 202,171,000   $ 202,171,000   201,911,000  
Individually evaluated for impairment 708,000   708,000   990,000  
Loans acquired with deteriorated credit quality 19,000   19,000   20,000  
Collectively evaluated for impairment 201,444,000   201,444,000   200,901,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 16,000   16,000   18,000  
Collectively evaluated for impairment 1,158,000   1,158,000   1,156,000  
Real Estate Loans [Member] | Commercial [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 641,633,000   641,633,000   596,255,000  
Individually evaluated for impairment 8,844,000   8,844,000   9,183,000  
Loans acquired with deteriorated credit quality 2,235,000   2,235,000   2,937,000  
Collectively evaluated for impairment 630,554,000   630,554,000   584,135,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 97,000   97,000   95,000  
Collectively evaluated for impairment 7,009,000   7,009,000   6,121,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 9,691,000   9,691,000   9,847,000  
Real Estate Loans [Member] | Agricultural [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 310,274,000   310,274,000   315,158,000  
Individually evaluated for impairment 4,490,000   4,490,000   4,645,000  
Loans acquired with deteriorated credit quality 1,647,000   1,647,000   1,686,000  
Collectively evaluated for impairment 304,137,000   304,137,000   308,827,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 12,000   12,000   83,000  
Collectively evaluated for impairment 4,694,000   4,694,000   4,870,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 4,742,000   4,742,000   4,811,000  
Real Estate Loans [Member] | Construction [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 63,065,000   63,065,000   35,404,000  
Individually evaluated for impairment 0   0   0  
Loans acquired with deteriorated credit quality 0   0   0  
Collectively evaluated for impairment 63,065,000   63,065,000   35,404,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 0   0   0  
Collectively evaluated for impairment 496,000   496,000   122,000  
Consumer [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 8,684,000   8,684,000   30,277,000  
Individually evaluated for impairment 0   0   2,000  
Loans acquired with deteriorated credit quality 0   0   0  
Collectively evaluated for impairment 8,684,000   8,684,000   30,275,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 0   0   0  
Collectively evaluated for impairment 85,000   85,000   321,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 0   0   2,000  
Other Commercial Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 104,349,000   104,349,000   114,169,000  
Individually evaluated for impairment 933,000   933,000   1,335,000  
Loans acquired with deteriorated credit quality 43,000   43,000   232,000  
Collectively evaluated for impairment 103,373,000   103,373,000   112,602,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 35,000   35,000   170,000  
Collectively evaluated for impairment 1,293,000   1,293,000   1,056,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 1,572,000   1,572,000   1,908,000  
Other Agricultural Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 33,720,000   33,720,000   48,779,000  
Individually evaluated for impairment 1,047,000   1,047,000   1,122,000  
Loans acquired with deteriorated credit quality 0   0   0  
Collectively evaluated for impairment 32,673,000   32,673,000   47,657,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 109,000   109,000   144,000  
Collectively evaluated for impairment 474,000   474,000   720,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 1,247,000   1,247,000   1,262,000  
State and Political Subdivision Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total financing receivables 51,213,000   51,213,000   63,328,000  
Individually evaluated for impairment 0   0   0  
Loans acquired with deteriorated credit quality 0   0   0  
Collectively evaluated for impairment 51,213,000   51,213,000   63,328,000  
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 0   0   0  
Collectively evaluated for impairment 404,000   404,000   $ 479,000  
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 $ 3,630,000   $ 3,630,000