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Acquisitions & Divestitures - Summary of Balance Sheet Amounts Relative to Branches Sold (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Feb. 10, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net income as reported | $ 16,315,000 | $ 11,832,000 | $ 40,661,000 | $ 35,209,000 |  |
Cash and cash equivalents | 183,108,000 |  | 183,108,000 |  |  | $ 198,802,000
Property, Plant and Equipment, Net | 32,803,000 |  | 32,803,000 |  |  | 14,910,000
Interest Receivable | 14,213,000 |  | 14,213,000 |  |  | 11,117,000
Goodwill | 117,345,000 |  | 117,345,000 |  |  | 30,334,000
Other Intangible Assets | 11,745,000 |  | 11,745,000 |  |  | 2,151,000
Deposits | 4,059,211,000 |  | 4,059,211,000 |  |  | 3,233,361,000
Other Borrowings | 209,104,000 |  | 209,104,000 |  |  | 276,980,000
Interest Payable | 2,007,000 |  | 2,007,000 |  |  | 1,105,000
Other Liabilities | $ 37,869,000 |  | $ 37,869,000 |  |  | $ 77,244,000
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  | $ 29,300,000 |
Common shares issued related to acquisition | 141,729,000 | 0 | 141,729,000 | 0 |  |
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 |  |  | $ 155,907,000 | $ 146,623,000 |  |
Net income as reported |  |  | $ 40,151,000 | $ 42,298,000 |  |
Diluted Earnings Per Share Pro Forma | $ / shares |  |  | $ 1.70 | $ 1.80 |  |
As Recorded by JCB [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 33,739,000 |
Interest-bearing Deposit Liabilities |  |  |  |  | 1,715,000 |
Securities |  |  |  |  | 148,670,000 |
Portfolio loans, net |  |  |  |  | 685,905,000 |
Other real estate owned |  |  |  |  | 6,762,000 |
Other Investments |  |  |  |  | 2,695,000 |
Property, Plant and Equipment, Net |  |  |  |  | 21,780,000 |
Interest Receivable |  |  |  |  | 2,794,000 |
Goodwill |  |  |  |  | 7,806,000 |
Other Intangible Assets |  |  |  |  | 25,000 |
Deferred Tax Assets |  |  |  |  | 4,634,000 |
Other Assets |  |  |  |  | 19,107,000 |
Total assets acquired |  |  |  |  | 935,632,000 |
Deposits |  |  |  |  | 764,539,000 |
Other Borrowings |  |  |  |  | 55,430,000 |
Trust preferred securities |  |  |  |  | 12,887,000 |
Interest Payable |  |  |  |  | 653,000 |
Other Liabilities |  |  |  |  | 5,006,000 |
Total Liabilities Assumed |  |  |  |  | 838,515,000 |
Net assets acquired |  |  |  |  | 97,117,000 |
Adjustments associated with acquisition [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 0 |
Interest-bearing Deposit Liabilities |  |  |  |  | 0 |
Securities |  |  |  |  | 0 |
Portfolio loans, net |  |  |  |  | (11,094,000) |
Other real estate owned |  |  |  |  | (5,082,000) |
Other Investments |  |  |  |  | 0 |
Property, Plant and Equipment, Net |  |  |  |  | (3,325,000) |
Interest Receivable |  |  |  |  | 0 |
Goodwill |  |  |  |  | (7,806,000) |
Other Intangible Assets |  |  |  |  | 11,489,000 |
Deferred Tax Assets |  |  |  |  | 3,991,000 |
Other Assets |  |  |  |  | (296,000) |
Total assets acquired |  |  |  |  | (12,123,000) |
Deposits |  |  |  |  | 629,000 |
Other Borrowings |  |  |  |  | 681,000 |
Trust preferred securities |  |  |  |  | (382,000) |
Interest Payable |  |  |  |  | 0 |
Other Liabilities |  |  |  |  | 65,000 |
Total Liabilities Assumed |  |  |  |  | 993,000 |
Net assets acquired |  |  |  |  | (13,116,000) |
As Recorded by EFSC [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 33,739,000 |
Interest-bearing Deposit Liabilities |  |  |  |  | 1,715,000 |
Securities |  |  |  |  | 148,670,000 |
Portfolio loans, net |  |  |  |  | 674,811,000 |
Other real estate owned |  |  |  |  | 1,680,000 |
Other Investments |  |  |  |  | 2,695,000 |
Property, Plant and Equipment, Net |  |  |  |  | 18,455,000 |
Interest Receivable |  |  |  |  | 2,794,000 |
Goodwill |  |  |  |  | 0 |
Other Intangible Assets |  |  |  |  | 11,514,000 |
Deferred Tax Assets |  |  |  |  | 8,625,000 |
Other Assets |  |  |  |  | 18,811,000 |
Total assets acquired |  |  |  |  | 923,509,000 |
Deposits |  |  |  |  | 765,168,000 |
Other Borrowings |  |  |  |  | 56,111,000 |
Trust preferred securities |  |  |  |  | 12,505,000 |
Interest Payable |  |  |  |  | 653,000 |
Other Liabilities |  |  |  |  | 5,071,000 |
Total Liabilities Assumed |  |  |  |  | 839,508,000 |
Net assets acquired |  |  |  |  | 84,001,000 |
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  | $ 29,283,000 |
Common shares issued related 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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