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Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
FHLBB borrowings | $ 25,000 |
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two |  | $ 10,000
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral | 1,400,000 | 1,100,000
FHLB advances, securities pledged as collateral | 150 | 172
Federal Home Loan Bank Advances | $ 40,825 | $ 35,000
Long-term Debt [Member] |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.87% | 2.19%
Short-term Debt |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.28% | 1.43%
FHLBB borrowings |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.87% | 1.87%
FHLBB borrowings | Long-term Debt [Member] |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.87% | 1.87%
FHLBB borrowings | Long-term Debt [Member] |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Long-term Federal Home Loan Bank Advances | $ 10,000 | $ 10,000
FHLBB borrowings | Short-term Debt |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
FHLBB borrowings | $ 25,000 | $ 25,000
Debt, Weighted Average Interest Rate | 1.79% | 2.71%
FHLBB Borrowing Maturing February 2020 |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Federal Home Loan Bank Advances | $ 10,000 |
FHLBB Borrowing Maturing January 2020 |  |
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items] |  |
Federal Home Loan Bank Advances | $ 30,825 |

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- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 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 Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64702-112823 Reference 3: 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 advances from Federal Home Loan Bank (FHLBank) maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=6802200&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 advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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=6802200&loc=d3e1835-112601 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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