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Acquisitions & Divestitures - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 08, 2019 USD ($) office $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Mar. 07, 2019 $ / shares | Feb. 10, 2017 USD ($) shares branch $ / shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold |  | $ 167,256,000 | $ 196,552,000 |  |  |
Number of operating JCB branches | branch |  |  |  |  |  | 13
Total shares awarded to JCB shareholders | shares |  |  |  |  |  | 3,300,000
Sale of Stock, Consideration Received Per Transaction | $ / shares |  |  |  |  |  | $ 85.39
EFSC common stock offered per share of JCB common stock | shares |  |  |  |  |  | 2.75
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  |  | $ 29,300,000
EFSC Closing Stock Price |  |  |  |  |  | 42.95
Transaction value including JCB's common stock and stock options |  |  |  |  |  | $ 171,000,000.0
Business Combination, Acquisition Related Costs |  |  |  | $ 6,500,000 |  |
Interest-earning deposits greater than 90 days |  | 3,730,000 | 3,185,000 |  |  |
Securities available-for-sale |  | 1,135,317,000 | 721,369,000 |  |  |
Loans and Leases Receivable, Net Amount |  | 5,271,049,000 | 4,306,525,000 |  |  |
Fixed assets, net |  | 60,013,000 | 32,109,000 |  |  |
Intangible assets, net |  | 26,076,000 | 8,553,000 |  |  |
Deposits |  | 5,771,023,000 | 4,587,985,000 |  |  |
Subordinated debentures and notes |  | 141,258,000 | 118,156,000 |  |  |
Other liabilities |  | 66,747,000 | 42,267,000 |  |  |
Goodwill |  | 210,344,000 | 117,345,000 |  |  |
As Recorded by Acquiree [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold | $ 13,899,000 |  |  |  |  |
Interest-earning deposits greater than 90 days | 100,000 |  |  |  |  |
Securities available-for-sale | 428,715,000 |  |  |  |  |
Loans and Leases Receivable, Net Amount | 705,057,000 |  |  |  |  |
Other Real Estate | 5,284,000 |  |  |  |  |
Other Investments | 6,673,000 |  |  |  |  |
Fixed assets, net | 27,586,000 |  |  |  |  |
Accrued interest receivable | 3,997,000 |  |  |  |  |
Intangible assets, net | 0 |  |  |  |  |
Deferred Tax Assets, State Taxes | 10,708,000 |  |  |  |  |
Other assets | 35,045,000 |  |  |  |  |
Total assets acquired | 1,237,064,000 |  |  |  |  |
Deposits | 1,081,151,000 |  |  |  |  |
Subordinated debentures and notes | 26,806,000 |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 6,800,000 |  |  |  |  |
Accrued interest payable | 370,000 |  |  |  |  |
Other liabilities | 5,842,000 |  |  |  |  |
Total Liabilities Assumed | 1,120,969,000 |  |  |  |  |
Net assets acquired (assumed) | 116,095,000 |  |  |  |  |
Adjustments associated with acquisition [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold | 0 |  |  |  |  |
Interest-earning deposits greater than 90 days | 0 |  |  |  |  |
Securities available-for-sale | (619,000) |  |  |  |  |
Loans and Leases Receivable, Net Amount | (20,743,000) |  |  |  |  |
Other Real Estate | (2,059,000) |  |  |  |  |
Other Investments | 0 |  |  |  |  |
Fixed assets, net | (300,000) |  |  |  |  |
Accrued interest receivable | 0 |  |  |  |  |
Intangible assets, net | 23,066,000 |  |  |  |  |
Deferred Tax Assets, State Taxes | (2,386,000) |  |  |  |  |
Other assets | (1,484,000) |  |  |  |  |
Total assets acquired | (4,525,000) |  |  |  |  |
Deposits | 36,000 |  |  |  |  |
Subordinated debentures and notes | (3,972,000) |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 171,000 |  |  |  |  |
Accrued interest payable | 0 |  |  |  |  |
Other liabilities | (827,000) |  |  |  |  |
Total Liabilities Assumed | (4,592,000) |  |  |  |  |
Net assets acquired (assumed) | $ 67,000 |  |  |  |  |
Trinity Capital Corporation [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Banking Offices | office | 6 |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 1.84 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable Per Acquired Share | 0.1972 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 4,000,000.0 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 37,275,000 |  |  |  |  |
Share Price | $ / shares |  |  |  |  | $ 43.07 |
Business Combination, Consideration Transferred | 209,160,000 |  |  |  |  |
Business Acquisition, Transaction Costs |  | 18,000,000.0 | 1,300,000 |  |  |
Goodwill, Acquired During Period | 93,000,000.0 |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold | 13,899,000 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 296,677,000 | 286,076,000 |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 107,626,000 | $ 85,579,000 |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares |  | $ 4.11 | $ 3.14 |  |  |
Interest-earning deposits greater than 90 days | 100,000 |  |  |  |  |
Securities available-for-sale | 428,096,000 |  |  |  |  |
Loans and Leases Receivable, Net Amount | 684,314,000 |  |  |  |  |
Other Real Estate | 3,225,000 |  |  |  |  |
Other Investments | 6,673,000 |  |  |  |  |
Fixed assets, net | 27,286,000 |  |  |  |  |
Accrued interest receivable | 3,997,000 |  |  |  |  |
Intangible assets, net | 23,066,000 |  |  |  |  |
Deferred Tax Assets, State Taxes | 8,322,000 |  |  |  |  |
Other assets | 33,561,000 |  |  |  |  |
Total assets acquired | 1,232,539,000 |  |  |  |  |
Deposits | 1,081,187,000 |  |  |  |  |
Subordinated debentures and notes | 22,834,000 |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 6,971,000 |  |  |  |  |
Accrued interest payable | 370,000 |  |  |  |  |
Other liabilities | 5,015,000 |  |  |  |  |
Total Liabilities Assumed | 1,116,377,000 |  |  |  |  |
Net assets acquired (assumed) | 116,162,000 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 171,885,000 |  |  |  |  |
Goodwill | $ 92,998,000 |  |  |  |  |
Core Deposits [Member] | Trinity Capital Corporation [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |  |

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