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Disclosure - Note 6 - FDIC Indemnification Asset - Changes in Receivable From FDIC (Details) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-6-fdic-indemnification-asset-changes-in-receivable-from-fdic-details Note 6 - FDIC Indemnification Asset - Changes in Receivable From FDIC (Details) Details 66 false false R67.htm 066 - Disclosure - Note 7 - Deposits - Components of Deposits (Details) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-7-deposits-components-of-deposits-details Note 7 - Deposits - Components of Deposits (Details) Details 67 false false R68.htm 067 - Disclosure - Note 8 - Borrowings (Details Textual) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-8-borrowings-details-textual Note 8 - Borrowings (Details Textual) Details http://www.firstcommunitybank.com/20180930/role/statement-note-8-borrowings-tables 68 false false R69.htm 068 - Disclosure - Note 8 - Borrowings - Components of Borrowings (Details) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-8-borrowings-components-of-borrowings-details Note 8 - 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Note 9 - Derivative Instruments and Hedging Activities - Effect of Derivative and Hedging Activity, on Consolidated Statements of Income (Details) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-9-derivative-instruments-and-hedging-activities-effect-of-derivative-and-hedging-activity-on-consolidated-statements-of-income-details Note 9 - Derivative Instruments and Hedging Activities - Effect of Derivative and Hedging Activity, on Consolidated Statements of Income (Details) Details 72 false false R73.htm 072 - Disclosure - Note 10 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) Sheet http://www.firstcommunitybank.com/20180930/role/statement-note-10-employee-benefit-plans-components-of-net-periodic-pension-cost-and-assumed-discount-rate-details Note 10 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) Details 73 false false R74.htm 073 - Disclosure - Note 11 - Earnings Per Share - 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