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Loans and the Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 20, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) Contract | Dec. 31, 2018 USD ($) Contract
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Net Deferred loan (costs) and fees |  | $ 3,200,000 | $ 4,500,000 | $ 3,200,000
Unamortized discount on purchased loans from acquisitions |  | 49,300,000 | 36,800,000 | 49,300,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard |  | 22,900,000 | 23,300,000 | 22,900,000
Internally assigned loan grades to residential real estate, home equity and consumer loans |  | 3,900,000 | 3,500,000 | 3,900,000
Loans acquired with deteriorated credit quality |  | 9,741,000 | $ 10,550,000 | $ 9,741,000
Number of restructured contracts greater than $0 million | Contract |  |  | 0 | 0
Threshold for TDR |  | 1,000,000.0 | $ 1,000,000.0 | $ 1,000,000.0
Accruing and non accrual TDR permitted interest-only payment period |  |  | 3 months |
Unfunded commitments to debtors for impaired loans |  | 100,000 | $ 200,000 | 100,000
Other real estate owned |  | 7,173,000 | 3,662,000 | 7,173,000
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality |  | 2,430,000 | 1,564,000 | 2,430,000
Other real estate owned |  | 1,300,000 | 600,000 | 1,300,000
Foreclosure proceedings in process on residential real estate loans |  | 6,000,000.0 | 4,700,000 | 6,000,000.0
Cost Recovery Method [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality, fair value | $ 2,400,000 |  |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans acquired with deteriorated credit quality |  | 900,000 | 842,000 | 900,000
Commercial and Industrial [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Annual sales of borrowers |  |  | 100,000,000 |
Farmers Capital Bank Corporation [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Unamortized discount on purchased loans from acquisitions |  | 23,400,000 | 16,900,000 | $ 23,400,000
Portfolio loans, net of unearned income | 1,064,800,000 |  |  |
Fair value of acquired loans | 1,025,800,000 |  |  |
Fair market value adjustment of acquired loans | 988,300,000 |  |  |
Fair market value adjustment of acquired loans | 26,000,000.0 |  |  |
Loans acquired with deteriorated credit quality | 5,300,000 |  | 3,000,000.0 |
Loans acquired with deteriorated credit quality, fair value | $ 4,600,000 |  |  |
Loans acquired with deteriorated credit quality outstanding customer balance |  |  | 3,500,000 |
Acquired impaired loans allowances for loan losses |  |  | $ 0 |
Acquired loans, sold book value |  | 45,200,000 |  |
Acquired loans, sold |  | $ 32,900,000 |  |

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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