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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total net securities brokerage revenue | $ 1,765 | $ 1,836 | $ 5,597 | $ 5,315
Electronic banking fees | 5,253 | 6,139 | 18,299 | 16,697
Mortgage banking income | 2,588 | 1,521 | 5,262 | 4,297
Net gain on other real estate owned and other assets | 158 | 150 | 670 | 641
Total Service Charges on Deposits [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 7,056 | 6,313 | 19,803 | 16,282
Trust Account fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 4,265 | 4,006 | $ 13,529 | 11,856
Point of revenue recognition |  |  | Over time |
WesMark Fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 2,160 | 2,259 | $ 6,351 | 6,664
Point of revenue recognition |  |  | Over time |
Total Trust Fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 6,425 | 6,265 | $ 19,880 | 18,520
Commercial Banking Fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 513 | 563 | $ 1,480 | 1,406
Point of revenue recognition |  |  | Over time |
Personal Service Charges [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total trust fees/Total service charges on deposits | 6,543 | 5,750 | $ 18,323 | 14,876
Point of revenue recognition |  |  | At a point in time & over time |
Annuity Commissions [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total net securities brokerage revenue | 1,204 | 1,326 | $ 4,018 | 3,836
Point of revenue recognition |  |  | At a point in time |
Equity And Debt Security Trades [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total net securities brokerage revenue | 151 | 116 | $ 356 | 304
Point of revenue recognition |  |  | At a point in time |
Managed Money [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total net securities brokerage revenue | 153 | 173 | $ 484 | 477
Point of revenue recognition |  |  | Over time |
Trail Commissions [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Total net securities brokerage revenue | 257 | 221 | $ 739 | 698
Point of revenue recognition |  |  | Over time |
Payment Processing Fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Payment Processing Fees | $ 709 | $ 311 | $ 2,142 | $ 311
Point of revenue recognition |  |  | At a point in time & over time |
Electronic Banking Fees [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Point of revenue recognition |  |  | At a point in time |
Mortgage [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Point of revenue recognition |  |  | At a point in time |
Other Real Estate Owned and Other Assets [Member] |  |  |  |
Schedule of Revenue Recognition [Line Items] |  |  |  |
Point of revenue recognition |  |  | At a point in time |

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- Definition Amount of commission revenue from buying and selling securities on behalf of customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 05 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68070981&loc=d3e40544-110947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(b)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned and other assets, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned and other assets after acquisition or physical possession. + References No definition available. + Details
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- Definition The non interest income derived from mortgage banking.Includes fees earned from loans sold in the secondary market, gains and losses on the sale of mortgage loans to investors, and gains and losses resulting from mortgage-related derivative financial instruments. + References No definition available. + Details
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