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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 17, 2020
Dec. 31, 2019
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables $ 1,365,879,000   $ 1,365,879,000     $ 1,115,569,000
Individually evaluated for impairment 17,768,000   17,768,000     19,672,000
Loans acquired with deteriorated credit quality 5,354,000   5,354,000     1,282,000
Collectively evaluated for impairment 1,342,757,000   1,342,757,000     1,094,615,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Allowance for loan losses 15,169,000   15,169,000     13,845,000
Individually evaluated for impairment 791,000   791,000     735,000
Allowance for loan losses related to loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 14,378,000   14,378,000     13,110,000
Loans and Leases Receivable, Net Amount [Abstract]            
Net loans 1,350,710,000   1,350,710,000     1,101,724,000
Net loans, individually evaluated for impairment 16,977,000   16,977,000     18,937,000
Net loans, loans acquired with deteriorated credit quality 5,354,000   5,354,000     1,282,000
Net loans, collectively evaluated for impairment 1,328,379,000   1,328,379,000     1,081,505,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 19,559,000   19,559,000     21,220,000
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]            
Balance at beginning of period 987,000 $ 100,000 89,000 $ 104,000    
Acquisition of Midcoast 0 0 966,000 0    
Accretion (100,000) (10,000) (168,000) (14,000)    
Balance at end of period 887,000 $ 90,000 887,000 $ 90,000    
Loans acquired with specific evidence of deterioration in credit quality [Abstract]            
Outstanding balance 9,479,000   9,479,000     4,072,000
Carrying amount 5,354,000   5,354,000     1,282,000
COVID-19 [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Outstanding principal balances 53,900,000   53,900,000      
Loans and Leases Receivable, Net Amount [Abstract]            
Proceeds from loans receivable 2,100,000   $ 2,100,000      
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 loan receivables 208,084,000   $ 208,084,000     217,088,000
Individually evaluated for impairment 1,041,000   1,041,000     1,166,000
Loans acquired with deteriorated credit quality 20,000   20,000     23,000
Collectively evaluated for impairment 207,023,000   207,023,000     215,899,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 29,000   29,000     32,000
Collectively evaluated for impairment 1,190,000   1,190,000     1,082,000
Real Estate Loans [Member] | Commercial [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 535,456,000   535,456,000     342,023,000
Individually evaluated for impairment 9,465,000   9,465,000     11,537,000
Loans acquired with deteriorated credit quality 3,306,000   3,306,000     1,210,000
Collectively evaluated for impairment 522,685,000   522,685,000     329,276,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 341,000   341,000     251,000
Collectively evaluated for impairment 4,965,000   4,965,000     4,298,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 10,053,000   10,053,000     12,070,000
Real Estate Loans [Member] | Agricultural [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 310,702,000   310,702,000     311,464,000
Individually evaluated for impairment 4,398,000   4,398,000     3,782,000
Loans acquired with deteriorated credit quality 1,722,000   1,722,000     0
Collectively evaluated for impairment 304,582,000   304,582,000     307,682,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 79,000   79,000     151,000
Collectively evaluated for impairment 4,727,000   4,727,000     4,871,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 4,614,000   4,614,000     3,900,000
Real Estate Loans [Member] | Construction [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 28,656,000   28,656,000     15,519,000
Individually evaluated for impairment 0   0     0
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 28,656,000   28,656,000     15,519,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 0   0     0
Collectively evaluated for impairment 85,000   85,000     43,000
Consumer [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 30,625,000   30,625,000     9,947,000
Individually evaluated for impairment 15,000   15,000     4,000
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 30,610,000   30,610,000     9,943,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 12,000   12,000     0
Collectively evaluated for impairment 340,000   340,000     112,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 15,000   15,000     4,000
Other Commercial Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 129,731,000   129,731,000     69,970,000
Individually evaluated for impairment 1,603,000   1,603,000     1,902,000
Loans acquired with deteriorated credit quality 0   0     49,000
Collectively evaluated for impairment 128,128,000   128,128,000     68,019,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 181,000   181,000     147,000
Collectively evaluated for impairment 1,049,000   1,049,000     1,108,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 2,225,000   2,225,000     2,517,000
Other Agricultural Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 40,790,000   40,790,000     55,112,000
Individually evaluated for impairment 1,246,000   1,246,000     1,281,000
Loans acquired with deteriorated credit quality 306,000   306,000     0
Collectively evaluated for impairment 39,238,000   39,238,000     53,831,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 149,000   149,000     154,000
Collectively evaluated for impairment 586,000   586,000     807,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Unpaid principal balance 1,368,000   1,368,000     1,347,000
State and Political Subdivision Loans [Member]            
Segments of loan portfolio and allowance for loan losses [Abstract]            
Total loan receivables 81,835,000   81,835,000     94,446,000
Individually evaluated for impairment 0   0     0
Loans acquired with deteriorated credit quality 0   0     0
Collectively evaluated for impairment 81,835,000   81,835,000     94,446,000
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]            
Individually evaluated for impairment 0   0     0
Collectively evaluated for impairment 514,000   514,000     $ 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 $ 4,654,000   $ 4,654,000