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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
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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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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