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Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 17, 2020 | Dec. 31, 2019
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | $ 1,363,633,000 |  | $ 1,363,633,000 |  |  | $ 1,115,569,000
Individually evaluated for impairment | 19,523,000 |  | 19,523,000 |  |  | 19,672,000
Loans acquired with deteriorated credit quality | 6,003,000 |  | 6,003,000 |  |  | 1,282,000
Collectively evaluated for impairment | 1,338,107,000 |  | 1,338,107,000 |  |  | 1,094,615,000
Allowance for loan losses | 14,827,000 |  | 14,827,000 |  |  | 13,845,000
Individually evaluated for impairment | 888,000 |  | 888,000 |  |  | 735,000
Allowance for loan losses related to loans acquired with deteriorated credit quality | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 13,939,000 |  | 13,939,000 |  |  | 13,110,000
Net loans | 1,348,806,000 |  | 1,348,806,000 |  |  | 1,101,724,000
Net loans, individually evaluated for impairment | 18,635,000 |  | 18,635,000 |  |  | 18,937,000
Net loans, loans acquired with deteriorated credit quality | 6,003,000 |  | 6,003,000 |  |  | 1,282,000
Net loans, collectively evaluated for impairment | 1,324,168,000 |  | 1,324,168,000 |  |  | 1,081,505,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 21,202,000 |  | 21,202,000 |  |  | 21,220,000
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 88,000 | $ 102,000 | 89,000 | $ 104,000 |  |
Acquisition of Midcoast | 966,000 | 0 | 966,000 | 0 |  |
Accretion | (67,000) | (2,000) | (68,000) | (4,000) |  |
Balance at end of period | 987,000 | $ 100,000 | 987,000 | $ 100,000 |  |
Loans acquired with specific evidence of deterioration in credit quality [Abstract] |  |  |  |  |  |
Outstanding balance | 10,589,000 |  | 10,589,000 |  |  | 4,072,000
Carrying amount | 6,003,000 |  | $ 6,003,000 |  |  | 1,282,000
Minimum [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Number of days past for loan to be considered impaired, Minimum |  |  | 90 days |  |  |
First Mortgage [Member] | Minimum [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Period of mortgage on real estate |  |  | 15 years |  |  |
First Mortgage [Member] | Maximum [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Period of mortgage on real estate |  |  | 30 years |  |  |
Second Mortgage [Member] | Maximum [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [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/loan receivables | 210,789,000 |  | $ 210,789,000 |  |  | 217,088,000
Individually evaluated for impairment | 1,194,000 |  | 1,194,000 |  |  | 1,166,000
Loans acquired with deteriorated credit quality | 21,000 |  | 21,000 |  |  | 23,000
Collectively evaluated for impairment | 209,574,000 |  | 209,574,000 |  |  | 215,899,000
Individually evaluated for impairment | 30,000 |  | 30,000 |  |  | 32,000
Collectively evaluated for impairment | 1,176,000 |  | 1,176,000 |  |  | 1,082,000
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 513,598,000 |  | 513,598,000 |  |  | 342,023,000
Individually evaluated for impairment | 11,829,000 |  | 11,829,000 |  |  | 11,537,000
Loans acquired with deteriorated credit quality | 3,820,000 |  | 3,820,000 |  |  | 1,210,000
Collectively evaluated for impairment | 497,949,000 |  | 497,949,000 |  |  | 329,276,000
Individually evaluated for impairment | 452,000 |  | 452,000 |  |  | 251,000
Collectively evaluated for impairment | 4,492,000 |  | 4,492,000 |  |  | 4,298,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 12,402,000 |  | 12,402,000 |  |  | 12,070,000
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 313,136,000 |  | 313,136,000 |  |  | 311,464,000
Individually evaluated for impairment | 3,470,000 |  | 3,470,000 |  |  | 3,782,000
Loans acquired with deteriorated credit quality | 1,781,000 |  | 1,781,000 |  |  | 0
Collectively evaluated for impairment | 307,885,000 |  | 307,885,000 |  |  | 307,682,000
Individually evaluated for impairment | 77,000 |  | 77,000 |  |  | 151,000
Collectively evaluated for impairment | 4,984,000 |  | 4,984,000 |  |  | 4,871,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 3,628,000 |  | 3,628,000 |  |  | 3,900,000
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 31,744,000 |  | 31,744,000 |  |  | 15,519,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 31,744,000 |  | 31,744,000 |  |  | 15,519,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 81,000 |  | 81,000 |  |  | 43,000
Consumer [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 30,973,000 |  | 30,973,000 |  |  | 9,947,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 4,000
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 30,973,000 |  | 30,973,000 |  |  | 9,943,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 362,000 |  | 362,000 |  |  | 112,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance |  |  |  |  |  | 4,000
Other Commercial Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 132,503,000 |  | 132,503,000 |  |  | 69,970,000
Individually evaluated for impairment | 1,741,000 |  | 1,741,000 |  |  | 1,902,000
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  | 49,000
Collectively evaluated for impairment | 130,762,000 |  | 130,762,000 |  |  | 68,019,000
Individually evaluated for impairment | 175,000 |  | 175,000 |  |  | 147,000
Collectively evaluated for impairment | 1,026,000 |  | 1,026,000 |  |  | 1,108,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 2,360,000 |  | 2,360,000 |  |  | 2,517,000
Other Agricultural Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 44,912,000 |  | 44,912,000 |  |  | 55,112,000
Individually evaluated for impairment | 1,289,000 |  | 1,289,000 |  |  | 1,281,000
Loans acquired with deteriorated credit quality | 381,000 |  | 381,000 |  |  | 0
Collectively evaluated for impairment | 43,242,000 |  | 43,242,000 |  |  | 53,831,000
Individually evaluated for impairment | 154,000 |  | 154,000 |  |  | 154,000
Collectively evaluated for impairment | 667,000 |  | 667,000 |  |  | 807,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Unpaid principal balance | 1,377,000 |  | 1,377,000 |  |  | 1,347,000
State and Political Subdivision Loans [Member] |  |  |  |  |  |
Segments of loan portfolio and allowance for loan losses [Abstract] |  |  |  |  |  |
Total financing/loan receivables | 85,978,000 |  | 85,978,000 |  |  | 94,446,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 0
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 85,978,000 |  | 85,978,000 |  |  | 94,446,000
Individually evaluated for impairment | 0 |  | 0 |  |  | 0
Collectively evaluated for impairment | 547,000 |  | 547,000 |  |  | $ 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 | $ 4,796,000 |  | $ 4,796,000 |  |  |

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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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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as 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 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: 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 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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