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Borrowings and Borrowing Capacity - Summary of Junior Subordinated Debentures (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Face Value | $ 51,031,000 |
Carrying Value | 38,623,000 | $ 32,740,000
National Bancshares Capital Trusts II |  |
Debt Instrument [Line Items] |  |
Face Value | 15,464,000 |
Carrying Value | $ 12,861,000 |
Maturity Date | 2033-09 |
National Bancshares Capital Trusts II | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 3.00% |
Interest Rate | 4.59% |
National Bancshares Capital Trusts III |  |
Debt Instrument [Line Items] |  |
Face Value | $ 17,526,000 |
Carrying Value | $ 12,389,000 |
Maturity Date | 2036-07 |
National Bancshares Capital Trusts III | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 1.64% |
Interest Rate | 3.00% |
ColoEast Capital Trust I |  |
Debt Instrument [Line Items] |  |
Face Value | $ 5,155,000 |
Carrying Value | $ 3,417,000 |
Maturity Date | 2035-09 |
ColoEast Capital Trust I | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 1.60% |
Interest Rate | 3.29% |
ColoEast Capital Trust II |  |
Debt Instrument [Line Items] |  |
Face Value | $ 6,700,000 |
Carrying Value | $ 4,485,000 |
Maturity Date | 2037-03 |
ColoEast Capital Trust II | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 1.79% |
Interest Rate | 3.48% |
Valley Bancorp Statutory Trust I |  |
Debt Instrument [Line Items] |  |
Face Value | $ 3,093,000 |
Carrying Value | $ 2,844,000 |
Maturity Date | 2032-09 |
Valley Bancorp Statutory Trust I | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 3.40% |
Interest Rate | 5.07% |
Valley Bancorp Statutory Trust II |  |
Debt Instrument [Line Items] |  |
Face Value | $ 3,093,000 |
Carrying Value | $ 2,627,000 |
Maturity Date | 2034-07 |
Valley Bancorp Statutory Trust II | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Interest Rate, Description | LIBOR + 2.75% |
Interest Rate | 4.35% |

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- Definition Including the current and noncurrent portions, the face value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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