XML 86 R77.htm IDEA: XBRL DOCUMENT
v3.22.1

Subordinated Debt and Trust Preferred Securities (Narrative) (Details) - Subordinated Debt [Member] - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Dec. 22, 2020 | Mar. 20, 2020 | Dec. 19, 2017 | Oct. 01, 2017 | Dec. 09, 2015 | Mar. 31, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Subordinated Notes Due December 2030 [Member] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Dec. 31, 2030 |
Debt instrument, interest rate, effective percentage |  | 4.50% |  |  |  |  |  |  |
Debt instrument, Description of variable rate basis |  |  |  |  |  |  |  | The December 2020 Notes bear interest at a rate of 4.5% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the December 2020 Notes are floating will at no time be less than 4.5%. |
Subordinated debt issuance |  | $ 12,150,000 |  |  |  |  |  |  |
Debt instrument, payment terms |  |  |  |  |  |  |  | Interest is payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year, beginning on March 31, 2021. |
Debt instrument, redemption, description |  |  |  |  |  |  |  | The December 2020 Notes bear interest at a rate of 4.5% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the December 2020 Notes are floating will at no time be less than 4.5%. Interest is payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year, beginning on March 31, 2021. The December 2020 Notes will mature on December 31, 2030 and are redeemable, in whole or in part, without premium or penalty, on any interest payment date on or after December 31, 2025 and prior to December 31, 2030, subject to any required regulatory approvals. Additionally, if (i) all or any portion of the December 2020 Notes cease to be deemed Tier 2 Capital, (ii) interest on the December 2020 Notes fails to be deductible for United States federal income tax purposes, or (iii) Mid Penn will be considered an “investment company,” Mid Penn may redeem the December 2020 Notes, in whole but not in part, by giving 10 days’ notice to the holders of the December 2020 Notes. In the event of a redemption described in the previous sentence, Mid Penn will redeem the December 2020 Notes at 100% of the principal amount of the December 2020 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. |
Debt instrument, interest rate, effective percentage |  | 4.50% |  |  |  |  |  |  |
Notes payable to related parties |  |  |  |  |  |  | $ 750,000 |  | $ 750,000
Subordinated Notes Due March 2030 [Member] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Mar. 30, 2030 |  |
Debt instrument, interest rate, effective percentage |  |  | 4.00% |  |  |  |  |  |
Debt instrument, Description of variable rate basis |  |  |  |  |  |  | The March 2020 Notes bear interest at a rate of 4.0% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the March 2020 Notes are floating will at no time be less than 4.25%. |  |
Subordinated debt issuance | $ 6,870,000 |  | $ 15,000,000 |  |  |  | $ 8,130,000 |  |
Debt instrument, payment terms |  |  |  |  |  |  | Interest is payable semi-annually in arrears on June 30 and December 30 of each year, beginning on June 30, 2020, for the first five years after issuance and will be payable quarterly in arrears thereafter on March 30, June 30, September 30 and December 30. |  |
Debt instrument, redemption, description |  |  |  |  |  |  | The March 2020 Notes bear interest at a rate of 4.0% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the March 2020 Notes are floating will at no time be less than 4.25%. Interest is payable semi-annually in arrears on June 30 and December 30 of each year, beginning on June 30, 2020, for the first five years after issuance and will be payable quarterly in arrears thereafter on March 30, June 30, September 30 and December 30. The March 2020 Notes will mature on March 30, 2030 and are redeemable in whole or in part, without premium or penalty, at any time on or after March 30, 2025 and prior to March 30, 2030. Additionally, if all or any portion of the March 2020 Notes cease to be deemed Tier 2 Capital, Mid Penn may redeem, on any interest payment date, all or part of the 2020 Notes. In the event of a redemption described in the previous sentence, Mid Penn will redeem the March 2020 Notes at 100% of the principal amount of the March 2020 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. |  |
Debt instrument, interest rate, effective percentage |  |  | 4.25% |  |  |  |  |  |
Notes payable to related parties |  |  |  |  |  |  | $ 1,700,000 |  | 1,700,000
Subordinated Notes Due 2028 [Member] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Jan. 01, 2028 |  |
Debt instrument, interest rate, effective percentage |  |  |  | 5.25% |  |  |  |  |
Debt instrument, Description of variable rate basis |  |  |  |  |  |  | The 2017 Notes bear interest at a rate of 5.25% per year for the first five years and then float at the Wall Street Journal’s Prime Rate plus 0.50%, provided that the interest rate applicable to the outstanding principal balance will at no time be less than 5.0%. |  |
Subordinated debt issuance |  |  |  | $ 10,000,000 |  |  |  |  |
Debt instrument, payment terms |  |  |  |  |  |  | Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on July 15, 2018, for the first five years after issuance and will be payable quarterly in arrears thereafter on January 15, April 15, July 15, and October 15. |  |
Debt instrument, redemption, description |  |  |  |  |  |  | The 2017 Notes bear interest at a rate of 5.25% per year for the first five years and then float at the Wall Street Journal’s Prime Rate plus 0.50%, provided that the interest rate applicable to the outstanding principal balance will at no time be less than 5.0%. Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on July 15, 2018, for the first five years after issuance and will be payable quarterly in arrears thereafter on January 15, April 15, July 15, and October 15. The 2017 Notes will mature on January 1, 2028 and are redeemable in whole or in part, without premium or penalty, at any time on or after December 21, 2022, and prior to January 1, 2028. Additionally, Mid Penn may redeem the 2017 Notes in whole at any time, or in part from time to time, upon at least 30 days’ notice if: (i) a change or prospective change in law occurs that could prevent Mid Penn from deducting interest payable on the 2017 Notes for U.S. federal income tax purposes; (ii) an event occurs that precludes the 2017 Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) Mid Penn becomes required to register as an investment company under the Investment Company Act of 1940, as amended. In the event of a redemption described in the previous sentence, Mid Penn will redeem the 2017 Notes at 100% of the principal amount of the 2017 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. |  |
Notes payable to related parties |  |  |  |  |  |  | $ 1,450,000 |  | 1,450,000
Unamortized debt issuance cost |  |  |  |  |  |  | $ 38,000 |  | 44,000
Subordinated Notes Due 2028 [Member] | WSJ Prime Rate [Member] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |
Subordinated Notes Due 2028 [Member] | WSJ Prime Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  | 5.00% |  |  |  |  |
Subordinated Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Dec. 09, 2025 |  |
Debt instrument, interest rate, effective percentage |  |  |  |  |  | 5.15% |  |  |
Debt instrument, Description of variable rate basis |  |  |  |  |  |  | The 2015 Notes paid interest at a rate of 5.15% per year for the first five years outstanding, including the three months ended March 31, 2020. Beginning January 1, 2021, the 2015 Notes bear interest at a floating rate based on the Wall Street Journal’s Prime Rate plus 0.50%, provided that the interest rate applicable to the outstanding principal balance will at no time be less than 4.0%. |  |
Subordinated debt issuance |  |  |  |  |  | $ 7,500,000 |  |  |
Debt instrument, payment terms |  |  |  |  |  |  | Interest is payable quarterly in arrears on January 1, April 1, July 1 and October 1 of each year, beginning on January 1, 2016. |  |
Debt instrument, redemption, description |  |  |  |  |  |  | The 2015 Notes paid interest at a rate of 5.15% per year for the first five years outstanding, including the three months ended March 31, 2020. Beginning January 1, 2021, the 2015 Notes bear interest at a floating rate based on the Wall Street Journal’s Prime Rate plus 0.50%, provided that the interest rate applicable to the outstanding principal balance will at no time be less than 4.0%. Interest is payable quarterly in arrears on January 1, April 1, July 1 and October 1 of each year, beginning on January 1, 2016. The 2015 Notes will mature on December 9, 2025 and are redeemable in whole or in part, without premium or penalty, at any time on or after December 9, 2020, and prior to December 9, 2025. Additionally, Mid Penn may redeem the 2015 Notes in whole at any time, or in part from time to time, upon at least 30 days’ notice if: (i) a change or prospective change in law occurs that could prevent Mid Penn from deducting interest payable on the 2015 Notes for U.S. federal income tax purposes; (ii) an event occurs that precludes the 2015 Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) Mid Penn becomes required to register as an investment company under the Investment Company Act of 1940, as amended, in each case at 100% of the principal amount of the 2015 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. |  |
Notes payable to related parties |  |  |  |  |  |  | $ 1,930,000 |  | 1,930,000
Unamortized debt issuance cost |  |  |  |  |  |  | $ 38,000 |  | $ 44,000
Subordinated Notes Due 2025 [Member] | WSJ Prime Rate [Member] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |
Subordinated Notes Due 2025 [Member] | WSJ Prime Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  |  | 4.00% |  |  |
Riverview Acquisition [Member] |  |  |  |  |  |  |  |  |
Subordinate debt assumed | 25,000,000 |  |  |  |  |  |  |  |
Subordinated debt fair value premium | $ 2,302,000 |  |  |  |  |  |  |  |
Riverview agreement date | Oct. 06, 2020 |  |  |  |  |  |  |  |
Debt instrument, maturity date | Oct. 15, 2030 |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage | 5.75% |  |  |  |  |  |  |  |
Debt instrument, Description of variable rate basis | quarterly to an interest rate per annum equal to the then current three-month secured overnight financing rate (“SOFR”) plus 563 basis points, payable quarterly until maturity. Mid Penn may redeem the Notes at par, in whole or in part, at its option, anytime beginning on October 15, 2025 |  |  |  |  |  |  |  |
CBT 2017 Notes [Member] |  |  |  |  |  |  |  |  |
Debt instrument acquisition date |  |  |  |  | Oct. 01, 2017 |  |  |  |
Subordinated debentures issued |  |  |  |  | 5,155,000 |  |  |  |
Debt instrument face value percentage |  |  |  |  | 100.00% |  |  |  |
CBT 2017 Notes [Member] | Three-Month LIBOR Rate Plus 2.95% [Member] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  | 2.95% |  |  |  |
CBT 2015 Notes [Member] |  |  |  |  |  |  |  |  |
Subordinated debentures issued |  |  |  |  | 4,124,000 |  |  |  |
Debt instrument face value percentage |  |  |  |  | 100.00% |  |  |  |
CBT 2017 Notes and CBT 2015 Notes [Member] |  |  |  |  |  |  |  |  |
Debt instrument fair value premium |  |  |  |  | $ 6,000 |  |  |  |

X
- Definition Business combination long term debt fair value premium. + References No definition available. + Details
Name: | mpb_BusinessCombinationLongTermDebtFairValuePremium
Namespace Prefix: | mpb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument agreement date. + References No definition available. + Details
Name: | mpb_DebtInstrumentAgreementDate
Namespace Prefix: | mpb_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument face value percentage. + References No definition available. + Details
Name: | mpb_DebtInstrumentFaceValuePercentage
Namespace Prefix: | mpb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instruments acquisition date. + References No definition available. + Details
Name: | mpb_DebtInstrumentsAcquisitionDate
Namespace Prefix: | mpb_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of reference rate used for variable rate of debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment. + 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(a)(3)) -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 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPaymentTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of debt redemption features under terms of the debt agreement. + 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 e -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for notes payable (written promise to pay), due to related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpb_SubordinatedNotesDueDecemberTwoThousandAndThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpb_SubordinatedNotesDueMarchTwoThousandAndThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpb_SubordinatedNotesDueTwoThousandAndTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpb_SubordinatedNotesDueTwoThousandAndTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpb_RiverviewAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpb_CBTTwoThousandSeventeenNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpb_ThreeMonthLiborRatePlusTwoPointNineFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpb_CBTTwoThousandFifteenNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpb_CBTTwoThousandSeventeenNotesAndCBTTwoThousandFifteenNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |