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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) | Apr. 17, 2020 USD ($) | Dec. 31, 2018 USD ($)
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | $ 1,405,281,000 | $ 1,115,569,000 |  |
Individually evaluated for impairment | 17,277,000 | 19,672,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 4,875,000 | 1,282,000 |  |
Collectively evaluated for impairment | 1,383,129,000 | 1,094,615,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Allowance for loan losses | 15,815,000 | 13,845,000 |  |
Individually evaluated for impairment | 510,000 | 735,000 |  | $ 676,000
Allowance for loan losses related to loans acquired with deteriorated credit quality | 0 | 0 |  |
Collectively evaluated for impairment | 15,305,000 | 13,110,000 |  | 12,208,000
Loans and Leases Receivable, Net Amount [Abstract] |  |  |  |
Net loans | 1,389,466,000 | 1,101,724,000 |  |
Net loans, individually evaluated for impairment | 16,767,000 | 18,937,000 |  |
Net loans, loans acquired with deteriorated credit quality | 4,875,000 | 1,282,000 |  |
Net loans, collectively evaluated for impairment | 1,367,824,000 | 1,081,505,000 |  |
Net unamortized loan fees and costs | 2,344,000 | 937,000 |  |
Real estate loans serviced for Freddie Mac and Fannie Mae | 178,986,000 | 148,889,000 |  |
Real estate loans sold to Freddie Mac and Fannie Mae without recourse | 162,050,000 | 127,402,000 |  |
Portfolio balance under MPF | 16,936,000 | 21,487,000 |  |
First-loss position for MPF maintained by FHLB | 151,000 |  |  |
Credit enhancement for MPF by FHLB | $ 764,000 |  |  |
Number of days past for loan to be considered impaired, Minimum | 90 days |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | $ 19,050,000 | 21,220,000 |  |
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |
Balance at beginning of period | 89,000 | 104,000 |  |
Addition due to MidCoast Acquisition | 966,000 | 0 |  |
Accretion | (267,000) | (15,000) |  |
Balance at end of period | 788,000 | 89,000 |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |
Outstanding balance | 8,958,000 | 4,072,000 |  |
Carrying amount | $ 4,875,000 | 1,282,000 |  |
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 |  |  |
COVID-19 [Member] | Paycheck Protection Program [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Outstanding principal balances | $ 54,300,000 |  |  |
Loans and Leases Receivable, Net Amount [Abstract] |  |  |  |
Interest rate | 1.00% |  |  |
Maximum amount of loan forgiven by guidance from SBA | $ 150,000 |  |  |
Number of loans forgiven | Loan | 192 |  |  |
Received payments from loans | $ 17,100,000 |  |  |
Number of loans completely paid off | Loan | 140 |  |  |
Proceeds from loans receivable | $ 2,100,000 |  |  |
Deferred fees | 1,100,000 |  |  |
Real Estate Loans [Member] | Residential [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 201,911,000 | 217,088,000 |  |
Individually evaluated for impairment | 990,000 | 1,166,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 20,000 | 23,000 |  |
Collectively evaluated for impairment | 200,901,000 | 215,899,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 18,000 | 32,000 |  | 24,000
Collectively evaluated for impairment | 1,156,000 | 1,082,000 |  | 1,081,000
Real Estate Loans [Member] | Commercial [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 596,255,000 | 342,023,000 |  |
Individually evaluated for impairment | 9,183,000 | 11,537,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 2,937,000 | 1,210,000 |  |
Collectively evaluated for impairment | 584,135,000 | 329,276,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 95,000 | 251,000 |  | 216,000
Collectively evaluated for impairment | 6,121,000 | 4,298,000 |  | 3,899,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 9,847,000 | 12,070,000 |  |
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 315,158,000 | 311,464,000 |  |
Individually evaluated for impairment | 4,645,000 | 3,782,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 1,686,000 | 0 |  |
Collectively evaluated for impairment | 308,827,000 | 307,682,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 83,000 | 151,000 |  | 84,000
Collectively evaluated for impairment | 4,870,000 | 4,871,000 |  | 4,180,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 4,811,000 | 3,900,000 |  |
Real Estate Loans [Member] | Construction [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 35,404,000 | 15,519,000 |  |
Individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality (PCI) | 0 | 0 |  |
Collectively evaluated for impairment | 35,404,000 | 15,519,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 0 | 0 |  | 0
Collectively evaluated for impairment | 122,000 | 43,000 |  | 58,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 0 | 0 |  |
Consumer [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 30,277,000 | 9,947,000 |  |
Individually evaluated for impairment | 2,000 | 4,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 0 | 0 |  |
Collectively evaluated for impairment | 30,275,000 | 9,943,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 0 | 0 |  | 0
Collectively evaluated for impairment | 321,000 | 112,000 |  | 120,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 2,000 | 4,000 |  |
Other Commercial Loans [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 114,169,000 | 69,970,000 |  |
Individually evaluated for impairment | 1,335,000 | 1,902,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 232,000 | 49,000 |  |
Collectively evaluated for impairment | 112,602,000 | 68,019,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 170,000 | 147,000 |  | 193,000
Collectively evaluated for impairment | 1,056,000 | 1,108,000 |  | 1,161,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 1,908,000 | 2,517,000 |  |
Other Commercial Loans [Member] | COVID-19 [Member] | Paycheck Protection Program [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 37,200,000 |  |  |
Other Agricultural Loans [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 48,779,000 | 55,112,000 |  |
Individually evaluated for impairment | 1,122,000 | 1,281,000 |  |
Loans acquired with deteriorated credit quality (PCI) | 0 | 0 |  |
Collectively evaluated for impairment | 47,657,000 | 53,831,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 144,000 | 154,000 |  | 159,000
Collectively evaluated for impairment | 720,000 | 807,000 |  | 593,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Unpaid principal balance | 1,262,000 | 1,347,000 |  |
State and Political Subdivision Loans [Member] |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |
Total loan receivables | 63,328,000 | 94,446,000 |  |
Individually evaluated for impairment | 0 | 0 |  |
Loans acquired with deteriorated credit quality (PCI) | 0 | 0 |  |
Collectively evaluated for impairment | 63,328,000 | 94,446,000 |  |
Loans And Leases Receivable, Allowance For Loan Losses [Abstract] |  |  |  |
Individually evaluated for impairment | 0 | 0 |  | 0
Collectively evaluated for impairment | $ 479,000 | $ 536,000 |  | $ 762,000
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 |

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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=121585399&loc=d3e13503-111538 + Details
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