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Loans and Allowance for Loan Losses (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) alternative	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	$ 2,551,000	$ 1,489,000	$ 5,483,000	$ 5,051,000	$ 7,462,000
Gross loans						$ 2,408,043,000	$ 1,946,114,000
Loans Receivable Held-for-sale, Amount						940,000	1,025,000
loans and leases receivable gross excluding loans held for sale						2,407,103,000	1,945,089,000
Less [Abstract]
Net deferred loan fees, premiums and discounts						7,883,000	6,613,000
Allowance for loan losses	22,045,000	18,209,000	19,977,000	16,753,000	16,753,000	23,839,000	19,977,000	$ 18,589,000
Net loans						2,375,381,000	1,918,499,000
Increase (Decrease) in loans receivable			456,900,000
Impaired Loans [Abstract]
Minimum value of loans individually measured for impairment			$ 250,000
Number of alternatives for measuring impaired loans receivable | alternative			3
Allowance for Loan Losses [Abstract]
Balance, beginning of period	22,045,000	18,209,000	$ 19,977,000	16,753,000	16,753,000
Provision for Loan and Lease Losses	2,551,000	1,489,000	5,483,000	5,051,000
Losses charged off	(846,000)	(1,409,000)	(2,041,000)	(3,890,000)	(5,195,000)
Recoveries	89,000	300,000	420,000	675,000	957,000
Balance, end of period	23,839,000	18,589,000	$ 23,839,000	18,589,000	19,977,000
Ending Balance [Abstract]
Individually evaluated for impairment						1,108,000	614,000	295,000
Collectively evaluated for impairment						22,320,000	19,354,000	18,294,000
Financing Receivable, Allowance for Credit Losses								0
Ending Balance [Abstract]
Individually evaluated for impairment						17,833,000	13,086,000	9,776,000
Collectively evaluated for impairment						2,367,922,000	1,926,156,000	1,852,302,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						2,400,160,000	1,939,501,000	1,867,562,000
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						91,768,000	107,721,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						91,355,000	107,594,000
Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						191,812,000	127,232,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						191,724,000	127,183,000
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						368,759,000	294,483,000
Ending Balance [Abstract]
Period When Loans are Charged-down			180 days
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						367,343,000	293,667,000
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						100,881,000	61,966,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						100,368,000	61,798,000
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						818,093,000	684,639,000
Loans Receivable Additional Information [Abstract]
Debt coverage ratio			1.20x
Amortization period of loans			twenty years
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						814,574,000	681,757,000
Commercial real estate | Minimum [Member]
Loans Receivable Additional Information [Abstract]
Maximum Loan-to-value Ratio (in hundredths)			65.00%
Commercial real estate | Maximum [Member]
Loans Receivable Additional Information [Abstract]
Maximum Loan-to-value Ratio (in hundredths)			80.00%
Loans secured by real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						1,571,313,000	1,276,041,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						1,565,364,000	1,271,999,000
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						120,812,000	86,602,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						120,770,000	86,631,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						541,099,000	445,378,000
Loans Receivable Additional Information [Abstract]
Maximum Loan-to-value Ratio (in hundredths)			80.00%
Amortization period of loans			seven years
Loans Receivable, Time Period			one year
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						540,387,000	444,263,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	165,000	72,000	$ 400,000	179,000	361,000
Gross loans						57,788,000	30,070,000
Less [Abstract]
Allowance for loan losses	928,000	716,000	803,000	693,000	693,000	1,042,000	803,000	691,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	928,000	716,000	803,000	693,000	693,000
Losses charged off	(133,000)	(160,000)	(397,000)	(397,000)	(521,000)
Recoveries	82,000	63,000	236,000	216,000	270,000
Balance, end of period	1,042,000	691,000	1,042,000	691,000	803,000
Ending Balance [Abstract]
Individually evaluated for impairment						1,000	1,000	2,000
Collectively evaluated for impairment						1,041,000	802,000	689,000
Ending Balance [Abstract]
Individually evaluated for impairment						159,000	200,000	210,000
Collectively evaluated for impairment						69,048,000	38,870,000	32,892,000
Loans Receivable, Net						69,212,000	39,070,000	33,102,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						57,248,000	29,749,000
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						117,031,000	108,023,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						116,391,000	106,859,000
Agricultural and Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						312,600,000	213,800,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ 98,800,000
Loans Receivable Additional Information [Abstract]
Maximum Loan-to-value Ratio (in hundredths)			65.00%
Amortization period of loans			twenty five years
Loans Receivable, Time Period			one year
Other Grain Farming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						236,800,000	170,800,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ 66,000,000
Motels and Hotels Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						129,500,000
Non-residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						235,200,000
Residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						230,200,000
Other Gambling Industries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						96,300,000
Unsecured Open-end Loans [Member]
Ending Balance [Abstract]
Period When Loans are Charged-down			180 days
Other Secured Loans [Member]
Ending Balance [Abstract]
Period When Loans are Charged-down			120 days
Commercial/ Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	1,197,000	1,440,000	$ 3,467,000	4,573,000	6,884,000
Less [Abstract]
Allowance for loan losses	18,663,000	14,747,000	16,546,000	12,901,000	12,901,000	19,426,000	16,546,000	15,103,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	18,663,000	14,747,000	16,546,000	12,901,000	12,901,000
Losses charged off	(439,000)	(1,242,000)	(715,000)	(2,725,000)	(3,795,000)
Recoveries	5,000	158,000	128,000	354,000	556,000
Balance, end of period	19,426,000	15,103,000	19,426,000	15,103,000	16,546,000
Ending Balance [Abstract]
Individually evaluated for impairment						858,000	586,000	168,000
Collectively evaluated for impairment						18,157,000	15,951,000	14,935,000
Ending Balance [Abstract]
Individually evaluated for impairment						14,924,000	11,372,000	7,635,000
Collectively evaluated for impairment						1,605,717,000	1,360,156,000	1,287,821,000
Loans Receivable, Net						1,632,076,000	1,371,787,000	1,300,940,000
Agricultural/ Agricultural Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	247,000	(57,000)	405,000	98,000	153,000
Less [Abstract]
Allowance for loan losses	1,900,000	1,743,000	1,742,000	2,249,000	2,249,000	2,054,000	1,742,000	1,687,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	1,900,000	1,743,000	1,742,000	2,249,000	2,249,000
Losses charged off	(93,000)	0	(93,000)	(662,000)	(662,000)
Recoveries	0	1,000	0	2,000	2,000
Balance, end of period	2,054,000	1,687,000	2,054,000	1,687,000	1,742,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	2,000	0
Collectively evaluated for impairment						2,054,000	1,740,000	1,687,000
Ending Balance [Abstract]
Individually evaluated for impairment						42,000	488,000	513,000
Collectively evaluated for impairment						312,145,000	213,033,000	206,669,000
Loans Receivable, Net						312,191,000	213,521,000	207,182,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	942,000	(2,000)	1,211,000	167,000	100,000
Less [Abstract]
Allowance for loan losses	554,000	969,000	$ 886,000	874,000	874,000	1,317,000	886,000	1,038,000
Loans Receivable Additional Information [Abstract]
Maximum Loan-to-value Ratio (in hundredths)			80.00%
Amortization period of loans			twenty five years
Balloon period			five years
Allowance for Loan Losses [Abstract]
Balance, beginning of period	554,000	969,000	$ 886,000	874,000	874,000
Losses charged off	(181,000)	(7,000)	(836,000)	(106,000)	(217,000)
Recoveries	2,000	78,000	56,000	103,000	129,000
Balance, end of period	1,317,000	1,038,000	1,317,000	1,038,000	886,000
Ending Balance [Abstract]
Individually evaluated for impairment						249,000	25,000	125,000
Collectively evaluated for impairment						1,068,000	861,000	913,000
Ending Balance [Abstract]
Individually evaluated for impairment						2,708,000	1,026,000	1,418,000
Collectively evaluated for impairment						381,012,000	314,097,000	324,920,000
Loans Receivable, Net						386,681,000	315,123,000	326,338,000
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	0	36,000	0	34,000	(36,000)
Less [Abstract]
Allowance for loan losses	0	34,000	0	36,000	36,000	0	0	70,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	0	34,000	0	36,000	36,000
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Balance, end of period	$ 0	$ 70,000	0	$ 70,000	$ 0
Ending Balance [Abstract]
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						0	0	70,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						0	0	0
Loans Receivable, Net						0	0	0
Financial Asset Acquired with Credit Deterioration [Member]
Less [Abstract]
Net loans						13,994,000	250,000
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						411,000	9,000	0
Ending Balance [Abstract]
Financing Receivable, Net						14,405,000	259,000	5,484,000
Financial Asset Acquired with Credit Deterioration [Member] | Construction and land development
Ending Balance [Abstract]
Financing Receivable, Net						292,000
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural real estate
Ending Balance [Abstract]
Financing Receivable, Net						0
Financial Asset Acquired with Credit Deterioration [Member] | 1-4 Family residential properties
Ending Balance [Abstract]
Financing Receivable, Net						2,961,000	0
Financial Asset Acquired with Credit Deterioration [Member] | Multifamily residential properties
Ending Balance [Abstract]
Financing Receivable, Net						3,912,000	0
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural loans
Ending Balance [Abstract]
Financing Receivable, Net						4,000	0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial loans
Ending Balance [Abstract]
Financing Receivable, Net						67,000	8,000
Financial Asset Acquired with Credit Deterioration [Member] | Consumer loans
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						5,000	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial/ Commercial Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						411,000	9,000	0
Ending Balance [Abstract]
Financing Receivable, Net						11,435,000	259,000	5,484,000
Financial Asset Acquired with Credit Deterioration [Member] | Agricultural/ Agricultural Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						4,000	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						2,961,000	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						$ 0	$ 0	$ 0
First BancTrust [Member] | Agricultural and Farm Loans [Member]
Less [Abstract]
Increase (Decrease) in loans receivable			$ 81,800,000

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The useful life of the loan receivable.

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The ratio used to analyze the amount of debt that can be supported by the cash flow generated from the property. The calculation is the net income generated by the property divided by the commercial mortgage payment.

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The amount of the mortgage loan as a percentage of the total appraised value of the real property. Loan-to-value is one of the key risk factors that lenders assess when qualifying borrowers for a mortgage.

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Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes Loans held-for-sale and loans and leases covered under loss sharing agreements.

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Minimum value of loans individually measured for impairment.

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The amount of time when past due loans receivable are written-off.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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