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Borrowed Funds (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |
Amount of line of credit with correspondent banks | $ 76,000,000 |  |  |  |  |  |  |
Credit facility with Federal Reserve Bank | 139,000,000 |  |  |  |  |  |  |
Line of credit with correspondent banks and credit facility with Federal Reserve Of Boston | $ 0 |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary [Abstract] |  |  |  |  |  |  |  |
Interest rate, due in year two | 0.00% | 0.00% |  |  |  |  |  |
Interest rate, due in year three | 0.00% | 0.00% |  |  |  |  |  |
Interest rate, due in year four |  | 0.00% |  |  |  |  |  |
Interest rate, due in year five and thereafter | 0.00% | 0.00% |  |  |  |  |  |
Due in twelve months maturity | $ 0 | $ 137,600,000 |  |  |  |  |  |
Due in year two maturity | 0 | 0 |  |  |  |  |  |
Due in year three maturity | 90,000 | 0 |  |  |  |  |  |
Due in year four maturity | 55,000,000 | 98,000 |  |  |  |  |  |
Due in year five maturity |  | 55,000,000 |  |  |  |  |  |
Due thereafter | 0 | 0 |  |  |  |  |  |
Total | 55,090,000 | 192,698,000 |  |  |  |  |  |
Repurchase agreements for municipal and commercial customers | 81,252,000 | 69,340,000 |  |  |  |  |  |
Total | $ 136,342,000 | $ 262,038,000 | $ 233,201,000 | $ 228,648,000 | $ 229,648,000 | $ 283,787,000 | $ 278,805,000 | $ 248,040,000
Minimum |  |  |  |  |  |  |  |
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |
Range of repurchase agreements' maturity dates (days) | 1 day |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary [Abstract] |  |  |  |  |  |  |  |
Interest rate, due in next twelve months | 0.00% | 0.00% |  |  |  |  |  |
Interest rate, due in year four | 1.35% |  |  |  |  |  |  |
Interest rate, due in year five |  | 1.35% |  |  |  |  |  |
Interest rate, Repurchase agreements for municipal and commercial customers | 0.05% | 0.10% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |
Range of repurchase agreements' maturity dates (days) | 3 days |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary [Abstract] |  |  |  |  |  |  |  |
Interest rate, due in next twelve months |  | 1.55% |  |  |  |  |  |
Interest rate, due in year four | 1.40% |  |  |  |  |  |  |
Interest rate, due in year five |  | 1.40% |  |  |  |  |  |
Interest rate, Repurchase agreements for municipal and commercial customers | 2.00% | 2.00% |  |  |  |  |  |

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- Definition Borrowing capacity under the credit lines established with correspondent banks. + References No definition available. + Details
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- Definition Represents the aggregate dollar amount of all future maturities of advances from the Federal Home Loan Bank, treasury tax and loan notes and securities sold under repurchase agreements as of balance sheet date. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of advance from Federal Home Loan Bank (FHLBank) maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of advance from Federal Home Loan Bank (FHLBank) maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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