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Loans and Allowance for Loan Losses (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) alternative	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	$ 1,877,000	$ 1,840,000	$ 2,932,000	$ 3,562,000	$ 7,462,000
Gross loans						$ 2,387,345,000	$ 1,946,114,000
Loans Receivable Held-for-sale, Amount						2,454,000	1,025,000
loans and leases receivable gross excluding loans held for sale						2,384,891,000	1,945,089,000
Less [Abstract]
Net deferred loan fees, premiums and discounts						10,662,000	6,613,000
Allowance for loan losses	20,771,000	17,846,000	19,977,000	16,753,000	16,753,000	22,045,000	19,977,000	$ 18,209,000
Net loans						2,352,184,000	1,918,499,000
Increase (Decrease) in loans receivable			433,700,000
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	20,771,000	17,846,000	$ 19,977,000	16,753,000	16,753,000
Provision for Loan and Lease Losses	1,877,000	1,840,000	2,932,000	3,562,000
Losses charged off	(719,000)	(1,718,000)	(1,195,000)	(2,481,000)	(5,195,000)
Recoveries	116,000	241,000	331,000	375,000	957,000
Balance, end of period	22,045,000	18,209,000	$ 22,045,000	18,209,000	19,977,000
Ending Balance [Abstract]
Individually evaluated for impairment						542,000	614,000	242,000
Collectively evaluated for impairment						21,503,000	19,354,000	17,967,000
Financing Receivable, Allowance for Credit Losses								0
Ending Balance [Abstract]
Individually evaluated for impairment						15,209,000	13,086,000	7,656,000
Collectively evaluated for impairment						2,345,448,000	1,926,156,000	1,811,868,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						2,376,683,000	1,939,501,000	1,825,634,000
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						88,945,000	107,721,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						88,481,000	107,594,000
Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						185,217,000	127,232,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						184,887,000	127,183,000
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						380,302,000	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						378,573,000	293,667,000
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						106,728,000	61,966,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						105,948,000	61,798,000
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						807,630,000	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						803,362,000	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						1,568,822,000	1,276,041,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						1,561,251,000	1,271,999,000
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						113,823,000	86,602,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						113,533,000	86,631,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						503,423,000	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						502,211,000	444,263,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	132,000	57,000	$ 235,000	107,000	361,000
Gross loans						59,932,000	30,070,000
Less [Abstract]
Allowance for loan losses	861,000	751,000	803,000	693,000	693,000	928,000	803,000	716,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	861,000	751,000	803,000	693,000	693,000
Losses charged off	(128,000)	(135,000)	(264,000)	(237,000)	(521,000)
Recoveries	63,000	43,000	154,000	153,000	270,000
Balance, end of period	928,000	716,000	928,000	716,000	803,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	1,000	1,000
Collectively evaluated for impairment						928,000	802,000	715,000
Ending Balance [Abstract]
Individually evaluated for impairment						153,000	200,000	248,000
Collectively evaluated for impairment						73,773,000	38,870,000	35,611,000
Loans Receivable, Net						73,932,000	39,070,000	35,859,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						59,090,000	29,749,000
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						141,345,000	108,023,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						140,598,000	106,859,000
Agricultural and Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						299,000,000	213,800,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ 85,200,000
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						172,300,000	170,800,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ 1,500,000
Motels and Hotels Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						121,100,000
Non-residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						189,700,000
Residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						130,000,000
Other Gambling Industries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						95,400,000
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)	1,334,000	1,667,000	$ 2,270,000	3,133,000	6,884,000
Less [Abstract]
Allowance for loan losses	17,368,000	13,771,000	16,546,000	12,901,000	12,901,000	18,166,000	16,546,000	14,747,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	17,368,000	13,771,000	16,546,000	12,901,000	12,901,000
Losses charged off	(536,000)	(871,000)	(773,000)	(1,483,000)	(3,795,000)
Recoveries	0	180,000	123,000	196,000	556,000
Balance, end of period	18,166,000	14,747,000	18,166,000	14,747,000	16,546,000
Ending Balance [Abstract]
Individually evaluated for impairment						493,000	586,000	194,000
Collectively evaluated for impairment						17,673,000	15,951,000	14,553,000
Ending Balance [Abstract]
Individually evaluated for impairment						12,163,000	11,372,000	5,653,000
Collectively evaluated for impairment						1,593,116,000	1,360,156,000	1,241,763,000
Loans Receivable, Net						1,617,579,000	1,371,787,000	1,253,526,000
Agricultural/ Agricultural Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	319,000	86,000	158,000	155,000	153,000
Less [Abstract]
Allowance for loan losses	1,581,000	2,319,000	1,742,000	2,249,000	2,249,000	1,900,000	1,742,000	1,743,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	1,581,000	2,319,000	1,742,000	2,249,000	2,249,000
Losses charged off	0	(662,000)	0	(662,000)	(662,000)
Recoveries	0	0	0	1,000	2,000
Balance, end of period	1,900,000	1,743,000	1,900,000	1,743,000	1,742,000
Ending Balance [Abstract]
Individually evaluated for impairment						30,000	2,000	0
Collectively evaluated for impairment						1,870,000	1,740,000	1,743,000
Ending Balance [Abstract]
Individually evaluated for impairment						150,000	488,000	261,000
Collectively evaluated for impairment						294,768,000	213,033,000	202,620,000
Loans Receivable, Net						295,156,000	213,521,000	202,881,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	92,000	23,000	269,000	169,000	100,000
Less [Abstract]
Allowance for loan losses	961,000	978,000	$ 886,000	874,000	874,000	1,051,000	886,000	969,000
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	961,000	978,000	$ 886,000	874,000	874,000
Losses charged off	(55,000)	(50,000)	(158,000)	(99,000)	(217,000)
Recoveries	53,000	18,000	54,000	25,000	129,000
Balance, end of period	1,051,000	969,000	1,051,000	969,000	886,000
Ending Balance [Abstract]
Individually evaluated for impairment						19,000	25,000	47,000
Collectively evaluated for impairment						1,032,000	861,000	922,000
Ending Balance [Abstract]
Individually evaluated for impairment						2,743,000	1,026,000	1,494,000
Collectively evaluated for impairment						383,791,000	314,097,000	331,874,000
Loans Receivable, Net						390,016,000	315,123,000	333,368,000
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	0	7,000	0	(2,000)	(36,000)
Less [Abstract]
Allowance for loan losses	0	27,000	0	36,000	36,000	0	0	34,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	0	27,000	0	36,000	36,000
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Balance, end of period	$ 0	$ 34,000	0	$ 34,000	$ 0
Ending Balance [Abstract]
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						0	0	34,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						0	0	0
Loans Receivable, Net						0	0	0
Receivables Acquired with Deteriorated Credit Quality [Member]
Less [Abstract]
Net loans						16,026,000	250,000
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	9,000	0
Ending Balance [Abstract]
Financing Receivable, Net						16,026,000	259,000	6,110,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction and land development
Ending Balance [Abstract]
Financing Receivable, Net						299,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Agricultural real estate
Ending Balance [Abstract]
Financing Receivable, Net						121,000
Receivables Acquired with Deteriorated Credit Quality [Member] | 1-4 Family residential properties
Ending Balance [Abstract]
Financing Receivable, Net						3,183,000	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Multifamily residential properties
Ending Balance [Abstract]
Financing Receivable, Net						3,951,000	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Agricultural loans
Ending Balance [Abstract]
Financing Receivable, Net						117,000	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial loans
Ending Balance [Abstract]
Financing Receivable, Net						569,000	8,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer loans
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						6,000	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial/ Commercial Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	9,000	0
Ending Balance [Abstract]
Financing Receivable, Net						12,300,000	259,000	6,110,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Agricultural/ Agricultural Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						238,000	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	0	0
Ending Balance [Abstract]
Financing Receivable, Net						3,482,000	0	0
Receivables Acquired with Deteriorated Credit Quality [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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- Definition

The useful life of the loan receivable.

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The period of time when the final, large payment is due on a real estate loan.

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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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Specifies the time period covered by the loan receivable.

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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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Number of alternatives for measuring impaired loans receivable.

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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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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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