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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Part III (PCI Loans) (Details) - USD ($)	Sep. 30, 2018	May 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 08, 2016
Carrying Amount [Abstract]
Allowance for loan losses				$ 0
Carrying amount, net of allowance	$ 2,375,381,000		$ 1,918,499,000
Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	14,405,000		259,000	5,484,000
Allowance for loan losses	(411,000)		(9,000)	0
Carrying amount, net of allowance	13,994,000		250,000
Agricultural loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	4,000		0
Construction and land development | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	292,000
Agricultural real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	0
1-4 Family residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	2,961,000		0
Multifamily residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	3,912,000		0
Commercial real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	7,164,000		251,000
Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	14,329,000		251,000
Commercial and industrial loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	67,000		8,000
Consumer loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	5,000		0	0
Allowance for loan losses	0		$ 0	$ 0
First Clover Leaf [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Contractual Payments at Acquisition [Abstract]
Contractually required payments	379,000				$ 10,650,000
Fair value of acquired loans at acquisition	241,000				$ 8,688,000
First BancTrust [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Contractual Payments at Acquisition [Abstract]
Contractually required payments	17,646,000	$ 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	$ 14,164,000	$ 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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