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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 |  |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 + Details
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