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BORROWED FUNDS AND SUBORDINATED DEBT - Short-term borrowings Additional information (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 0.40% | 1.88%
Letter of credit | $ 0 | $ 0
Line of Credit Facility, Maximum Month-end Outstanding Amount | 56,647,000 | 86,220,000
Other Correspondent Banks |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Line of Credit Facility, Maximum Borrowing Capacity | 45,000,000 | 45,000,000
Long-term Line of Credit, Total | 0 | 0
Federal Reserve Bank of Philadelphia | Collateral Pledged |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Investment pledged as collateral | $ 15,126,000 | $ 14,728,000
Customer repurchase agreements |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Debt, Weighted Average Interest Rate | 0.10% | 0.10%
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned, Total | $ 1,980,000 | $ 1,951,000
Federal Home Loan Bank of Pittsburgh |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Line of Credit Facility, Maximum Borrowing Capacity | 771,199,000 | 552,546,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 1,049,690,000 | 778,877,000
Line of Credit Facility, Remaining Borrowing Capacity | 698,977,000 | 416,127,000
Federal Home Loan Bank of Pittsburgh | Other Assets |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Federal Home Loan Bank Stock | 9,720,000 | 10,131,000
Federal Home Loan Bank of Pittsburgh | Federal Reserve Bank of Philadelphia |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Line of Credit Facility, Maximum Borrowing Capacity | 14,654,000 | 14,244,000
Long-term Line of Credit, Total | $ 0 | $ 0
Federal Home Loan Bank of Pittsburgh | Overnight Borrowing |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 1.81%
Federal Home Loan Bank of Pittsburgh | Federal Home Loan Bank Advances 1 |  |
BORROWED FUNDS AND SUBORDINATED DEBT |  |
Number of Short-term Advances | 5 | 7
Short-term Borrowing, Amount of Each Borrowing | $ 18,000,000 | $ 20,297,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 0.43% | 2.28%

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- Definition Carrying value of securities sold under agreements to repurchase and deposits received for securities loaned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: 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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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the 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 50 -Paragraph 3 -Subparagraph (b) -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 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 Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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