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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Apr. 17, 2020
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | $ 1,442,908,000 |  | $ 1,442,908,000 |  | $ 1,405,281,000 |
Individually evaluated for impairment | 15,332,000 |  | 15,332,000 |  | 17,277,000 |
Loans acquired with deteriorated credit quality | 3,869,000 |  | 3,869,000 |  | 4,875,000 |
Collectively evaluated for impairment | 1,423,707,000 |  | 1,423,707,000 |  | 1,383,129,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | 17,334,000 |  | 17,334,000 |  | 15,815,000 |
Individually evaluated for impairment | 213,000 |  | 213,000 |  | 510,000 |
Allowance for loan losses related to loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 17,121,000 |  | 17,121,000 |  | 15,305,000 |
Loans and Leases Receivable, Net Amount [Abstract] |  |  |  |  |  |
Net loans | 1,425,574,000 |  | 1,425,574,000 |  | 1,389,466,000 |
Net loans, individually evaluated for impairment | 15,119,000 |  | 15,119,000 |  | 16,767,000 |
Net loans, loans acquired with deteriorated credit quality | 3,869,000 |  | 3,869,000 |  | 4,875,000 |
Net loans, collectively evaluated for impairment | 1,406,586,000 |  | 1,406,586,000 |  | 1,367,824,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 17,510,000 |  | 17,510,000 |  | 19,050,000 |
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 584,000 | $ 987,000 | 788,000 | $ 89,000 |  |
Acquisition of Midcoast | 0 | 0 | 0 | 966,000 |  |
Reclassification of non-accretable discount | 29,000 | 0 | 29,000 | 0 |  |
Accretion | (135,000) | (100,000) | (339,000) | (168,000) |  |
Balance at end of period | 478,000 | $ 887,000 | 478,000 | $ 887,000 |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |  |
Outstanding balance | 6,935,000 |  | 6,935,000 |  | 8,958,000 |
Carrying amount | 3,869,000 |  | 3,869,000 |  | 4,875,000 |
COVID-19 [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net Amount [Abstract] |  |  |  |  |  |
Outstanding principal balances | 20,800,000 |  | 20,800,000 |  | 37,200,000 |
Loans originated |  |  | 24,300,000 |  |  |
Loans outstanding |  |  | 17,900,000 |  |  |
Maximum amount of loan forgiven by guidance from SBA |  |  | 150,000 |  |  |
Proceeds from loans receivable | 1,100,000 |  | 1,100,000 |  |  |
Deferred fees | 947,000 |  | $ 947,000 |  |  |
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 | 204,853,000 |  | $ 204,853,000 |  | 201,911,000 |
Individually evaluated for impairment | 690,000 |  | 690,000 |  | 990,000 |
Loans acquired with deteriorated credit quality | 19,000 |  | 19,000 |  | 20,000 |
Collectively evaluated for impairment | 204,144,000 |  | 204,144,000 |  | 200,901,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 14,000 |  | 14,000 |  | 18,000 |
Collectively evaluated for impairment | 1,176,000 |  | 1,176,000 |  | 1,156,000 |
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 657,485,000 |  | 657,485,000 |  | 596,255,000 |
Individually evaluated for impairment | 8,761,000 |  | 8,761,000 |  | 9,183,000 |
Loans acquired with deteriorated credit quality | 2,199,000 |  | 2,199,000 |  | 2,937,000 |
Collectively evaluated for impairment | 646,525,000 |  | 646,525,000 |  | 584,135,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 85,000 |  | 85,000 |  | 95,000 |
Collectively evaluated for impairment | 7,593,000 |  | 7,593,000 |  | 6,121,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 9,650,000 |  | 9,650,000 |  | 9,847,000 |
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 312,442,000 |  | 312,442,000 |  | 315,158,000 |
Individually evaluated for impairment | 4,428,000 |  | 4,428,000 |  | 4,645,000 |
Loans acquired with deteriorated credit quality | 1,651,000 |  | 1,651,000 |  | 1,686,000 |
Collectively evaluated for impairment | 306,363,000 |  | 306,363,000 |  | 308,827,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 17,000 |  | 17,000 |  | 83,000 |
Collectively evaluated for impairment | 4,729,000 |  | 4,729,000 |  | 4,870,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 4,708,000 |  | 4,708,000 |  | 4,811,000 |
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 68,408,000 |  | 68,408,000 |  | 35,404,000 |
Individually evaluated for impairment | 0 |  | 0 |  | 0 |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 68,408,000 |  | 68,408,000 |  | 35,404,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 538,000 |  | 538,000 |  | 122,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance |  |  |  |  | 0 |
Consumer [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 31,042,000 |  | 31,042,000 |  | 30,277,000 |
Individually evaluated for impairment | 0 |  | 0 |  | 2,000 |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 31,042,000 |  | 31,042,000 |  | 30,275,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 318,000 |  | 318,000 |  | 321,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance |  |  |  |  | 2,000 |
Other Commercial Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 92,188,000 |  | 92,188,000 |  | 114,169,000 |
Individually evaluated for impairment | 462,000 |  | 462,000 |  | 1,335,000 |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 232,000 |
Collectively evaluated for impairment | 91,726,000 |  | 91,726,000 |  | 112,602,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 34,000 |  | 34,000 |  | 170,000 |
Collectively evaluated for impairment | 1,097,000 |  | 1,097,000 |  | 1,056,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 1,088,000 |  | 1,088,000 |  | 1,908,000 |
Other Agricultural Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 28,562,000 |  | 28,562,000 |  | 48,779,000 |
Individually evaluated for impairment | 991,000 |  | 991,000 |  | 1,122,000 |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 27,571,000 |  | 27,571,000 |  | 47,657,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 63,000 |  | 63,000 |  | 144,000 |
Collectively evaluated for impairment | 385,000 |  | 385,000 |  | 720,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 1,207,000 |  | 1,207,000 |  | 1,262,000 |
State and Political Subdivision Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing receivables | 47,928,000 |  | 47,928,000 |  | 63,328,000 |
Individually evaluated for impairment | 0 |  | 0 |  | 0 |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 47,928,000 |  | 47,928,000 |  | 63,328,000 |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0 |
Collectively evaluated for impairment | 296,000 |  | 296,000 |  | $ 479,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 0 |  | 0 |  |  |
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 | $ 3,563,000 |  | $ 3,563,000 |  |  |

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- Definition Amount of reclassified non-accretable discount recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
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