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Acquisitions & Divestitures - Summary of Balance Sheet Amounts Relative to Branches Sold (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Feb. 10, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold | $ 153,323,000 |  |  |  | $ 198,802,000 |  |  |  | $ 153,323,000 | $ 198,802,000 |  |
Loans and Leases Receivable, Net Amount | 4,054,473,000 |  |  |  | 3,114,752,000 |  |  |  | 4,054,473,000 | 3,114,752,000 |  |
Fixed assets, net | 32,618,000 |  |  |  | 14,910,000 |  |  |  | 32,618,000 | 14,910,000 |  |
Accrued interest receivable | 14,069,000 |  |  |  | 11,117,000 |  |  |  | 14,069,000 | 11,117,000 |  |
Goodwill | 117,345,000 |  |  |  | 30,334,000 |  |  |  | 117,345,000 | 30,334,000 | $ 30,334,000 |
Intangible assets, net | 11,056,000 |  |  |  | 2,151,000 |  |  |  | 11,056,000 | 2,151,000 |  |
Deposits | 4,156,414,000 |  |  |  | 3,233,361,000 |  |  |  | 4,156,414,000 | 3,233,361,000 |  |
Other borrowings | 253,674,000 |  |  |  | 276,980,000 |  |  |  | 253,674,000 | 276,980,000 |  |
Investments trust preferred securities | 2,100,000 |  |  |  |  |  |  |  | 2,100,000 |  |  |
Accrued interest payable | 1,730,000 |  |  |  | 1,105,000 |  |  |  | 1,730,000 | 1,105,000 |  |
Other liabilities | 37,986,000 |  |  |  | 77,244,000 |  |  |  | 37,986,000 | 77,244,000 |  |
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  |  |  |  |  |  |  |  | $ 29,300,000
Net income | 7,529,000 | $ 16,315,000 | $ 11,955,000 | $ 12,391,000 | $ 13,628,000 | $ 11,832,000 | $ 12,352,000 | $ 11,025,000 | 48,190,000 | 48,837,000 | $ 38,450,000 |
Transaction value including JCB's common stock and stock options |  |  |  |  |  |  |  |  |  |  |  | 171,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  |  |  |  |  | 87,000,000
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 213,910,000 | 199,033,000 |  |
Net income |  |  |  |  |  |  |  |  | $ 47,227,000 | $ 56,994,000 |  |
Diluted Earnings Per Share Pro Forma | $ / shares |  |  |  |  |  |  |  |  | $ 2.03 | $ 2.42 |  |
As Recorded by JCB [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold |  |  |  |  |  |  |  |  |  |  |  | 33,739,000
Interest-bearing Deposit Liabilities |  |  |  |  |  |  |  |  |  |  |  | 1,715,000
Secured borrowings |  |  |  |  |  |  |  |  |  |  |  | 148,670,000
Loans and Leases Receivable, Net Amount |  |  |  |  |  |  |  |  |  |  |  | 685,905,000
Other Real Estate |  |  |  |  |  |  |  |  |  |  |  | 6,762,000
Other Investments |  |  |  |  |  |  |  |  |  |  |  | 2,695,000
Fixed assets, net |  |  |  |  |  |  |  |  |  |  |  | 21,780,000
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  | 2,794,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 7,806,000
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  | 25,000
Deferred Tax Assets, State Taxes |  |  |  |  |  |  |  |  |  |  |  | 4,634,000
Other assets |  |  |  |  |  |  |  |  |  |  |  | 19,107,000
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  | 935,632,000
Deposits |  |  |  |  |  |  |  |  |  |  |  | 764,539,000
Other borrowings |  |  |  |  |  |  |  |  |  |  |  | 55,430,000
Investments trust preferred securities |  |  |  |  |  |  |  |  |  |  |  | 12,887,000
Accrued interest payable |  |  |  |  |  |  |  |  |  |  |  | 653,000
Other liabilities |  |  |  |  |  |  |  |  |  |  |  | 5,006,000
Total Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  | 838,515,000
Net assets acquired (assumed) |  |  |  |  |  |  |  |  |  |  |  | 97,117,000
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-bearing Deposit Liabilities |  |  |  |  |  |  |  |  |  |  |  | 0
Secured borrowings |  |  |  |  |  |  |  |  |  |  |  | 0
Loans and Leases Receivable, Net Amount |  |  |  |  |  |  |  |  |  |  |  | (11,094,000)
Other Real Estate |  |  |  |  |  |  |  |  |  |  |  | (5,082,000)
Other Investments |  |  |  |  |  |  |  |  |  |  |  | 0
Fixed assets, net |  |  |  |  |  |  |  |  |  |  |  | (3,325,000)
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  | 0
Goodwill |  |  |  |  |  |  |  |  |  |  |  | (7,806,000)
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  | 11,489,000
Deferred Tax Assets, State Taxes |  |  |  |  |  |  |  |  |  |  |  | 3,991,000
Other assets |  |  |  |  |  |  |  |  |  |  |  | (296,000)
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  | (12,123,000)
Deposits |  |  |  |  |  |  |  |  |  |  |  | 629,000
Other borrowings |  |  |  |  |  |  |  |  |  |  |  | 681,000
Investments trust preferred securities |  |  |  |  |  |  |  |  |  |  |  | (382,000)
Accrued interest payable |  |  |  |  |  |  |  |  |  |  |  | 0
Other liabilities |  |  |  |  |  |  |  |  |  |  |  | 65,000
Total Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  | 993,000
Net assets acquired (assumed) |  |  |  |  |  |  |  |  |  |  |  | (13,116,000)
As Recorded by EFSC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold |  |  |  |  |  |  |  |  |  |  |  | 33,739,000
Interest-bearing Deposit Liabilities |  |  |  |  |  |  |  |  |  |  |  | 1,715,000
Secured borrowings |  |  |  |  |  |  |  |  |  |  |  | 148,670,000
Loans and Leases Receivable, Net Amount |  |  |  |  |  |  |  |  |  |  |  | 674,811,000
Other Real Estate |  |  |  |  |  |  |  |  |  |  |  | 1,680,000
Other Investments |  |  |  |  |  |  |  |  |  |  |  | 2,695,000
Fixed assets, net |  |  |  |  |  |  |  |  |  |  |  | 18,455,000
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  | 2,794,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 0
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  | 11,514,000
Deferred Tax Assets, State Taxes | $ 8,600,000 |  |  |  |  |  |  |  | $ 8,600,000 |  |  | 8,625,000
Other assets |  |  |  |  |  |  |  |  |  |  |  | 18,811,000
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  | 923,509,000
Deposits |  |  |  |  |  |  |  |  |  |  |  | 765,168,000
Other borrowings |  |  |  |  |  |  |  |  |  |  |  | 56,111,000
Investments trust preferred securities |  |  |  |  |  |  |  |  |  |  |  | 12,505,000
Accrued interest payable |  |  |  |  |  |  |  |  |  |  |  | 653,000
Other liabilities |  |  |  |  |  |  |  |  |  |  |  | 5,071,000
Total Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  | 839,508,000
Net assets acquired (assumed) |  |  |  |  |  |  |  |  |  |  |  | 84,001,000
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  |  |  |  |  |  |  |  | $ 29,283,000
Common shares issued in relation to acquisition |  |  |  |  |  |  |  |  |  |  |  | 141,729,000
Transaction value including JCB's common stock and stock options |  |  |  |  |  |  |  |  |  |  |  | $ 171,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  |  |  |  |  | $ 87,011,000.00

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