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Borrowings and Borrowing Capacity - Summary of Junior Subordinated Debentures (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Face Value | $ 51,031,000 |
Carrying Value | 39,083,000 | $ 38,623,000
National Bancshares Capital Trusts II |  |
Debt Instrument [Line Items] |  |
Face Value | 15,464,000 |
Carrying Value | $ 12,975,000 |
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 | 5.79% |
National Bancshares Capital Trusts III |  |
Debt Instrument [Line Items] |  |
Face Value | $ 17,526,000 |
Carrying Value | $ 12,576,000 |
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 | 4.08% |
ColoEast Capital Trust I |  |
Debt Instrument [Line Items] |  |
Face Value | $ 5,155,000 |
Carrying Value | $ 3,478,000 |
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 | 4.40% |
ColoEast Capital Trust II |  |
Debt Instrument [Line Items] |  |
Face Value | $ 6,700,000 |
Carrying Value | $ 4,554,000 |
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 | 4.59% |
Valley Bancorp Statutory Trust I |  |
Debt Instrument [Line Items] |  |
Face Value | $ 3,093,000 |
Carrying Value | $ 2,855,000 |
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 | 6.22% |
Valley Bancorp Statutory Trust II |  |
Debt Instrument [Line Items] |  |
Face Value | $ 3,093,000 |
Carrying Value | $ 2,645,000 |
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 | 5.54% |

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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 The average effective interest rate during the reporting period. + References Reference 1: 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=114775744&loc=d3e28551-108399 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=6877327&loc=d3e13212-122682 + 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://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=6879938&loc=d3e572229-122910 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=6876686&loc=d3e534808-122878 + Details
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