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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Part III (PCI Loans) (Details) - USD ($) | Jun. 30, 2018 | May 01, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Sep. 08, 2016
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Carrying Amount [Abstract] |  |  |  |  |
Allowance for loan losses |  |  |  | $ 0 |
Carrying amount, net of allowance | $ 2,352,184,000 |  | $ 1,918,499,000 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 16,026,000 |  | 259,000 | 6,110,000 |
Allowance for loan losses | 0 |  | (9,000) | 0 |
Carrying amount, net of allowance | 16,026,000 |  | 250,000 |  |
Agricultural loans | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 117,000 |  | 0 |  |
Construction and land development | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 299,000 |  |  |  |
Agricultural real estate | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 121,000 |  |  |  |
1-4 Family residential properties | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 3,183,000 |  | 0 |  |
Multifamily residential properties | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 3,951,000 |  | 0 |  |
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 7,780,000 |  | 251,000 |  |
Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 15,334,000 |  | 251,000 |  |
Commercial and industrial loans | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 569,000 |  | 8,000 |  |
Consumer loans | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Carrying Amount [Abstract] |  |  |  |  |
Carrying amount | 6,000 |  | 0 | 0 |
Allowance for loan losses | 0 |  | $ 0 | $ 0 |
First Clover Leaf [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Contractually required payments | 385,000 |  |  |  | $ 10,650,000
Fair value of acquired loans at acquisition | 247,000 |  |  |  | $ 8,688,000
First BancTrust [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |  |
Contractually required payments | 20,011,000 | $ 20,357,000 |  |  |
Certain Loans Acquired In A Transfer Nonaccretable Difference |  | (4,231,000) |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition |  | 16,126,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield | 0 |  |  |  |
Fair value of acquired loans at acquisition | $ 15,780,000 | $ 16,126,000 |  |  |

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