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Loans and Allowance for Loan Losses (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) alternative	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	$ 1,840,000	$ 733,000	$ 3,562,000	$ 846,000	$ 2,826,000
Gross loans						$ 1,833,349,000	$ 1,836,251,000
Loans Receivable Held-for-sale, Amount						1,932,000	1,175,000
loans and leases receivable gross excluding loans held for sale						1,831,417,000	1,835,076,000
Less [Abstract]
Net deferred loan fees, premiums and discounts						7,715,000	10,259,000
Allowance for loan losses	17,846,000	14,736,000	16,753,000	14,576,000	14,576,000	18,209,000	16,753,000	$ 15,164,000
Net loans						1,805,493,000	1,808,064,000
Increase (Decrease) in loans receivable			(2,600,000)
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	17,846,000	14,736,000	$ 16,753,000	14,576,000	14,576,000
Provision for Loan and Lease Losses	1,840,000	733,000	3,562,000	846,000
Losses charged off	(1,718,000)	(739,000)	(2,481,000)	(976,000)	(1,675,000)
Recoveries	241,000	434,000	375,000	718,000	1,026,000
Balance, end of period	18,209,000	15,164,000	$ 18,209,000	15,164,000	16,753,000
Ending Balance [Abstract]
Individually evaluated for impairment						242,000	858,000	297,000
Collectively evaluated for impairment						17,967,000	15,881,000	14,867,000
Financing Receivable, Allowance for Credit Losses								0
Ending Balance [Abstract]
Individually evaluated for impairment						7,656,000	5,266,000	2,006,000
Collectively evaluated for impairment						1,811,868,000	1,812,640,000	1,313,181,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						1,825,634,000	1,825,992,000	1,315,187,000
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						68,847,000	49,366,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						68,681,000	49,104,000
Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						123,508,000	126,216,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						123,420,000	126,108,000
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						311,699,000	328,119,000
Ending Balance [Abstract]
Period When Loans are Charged-down			180 days
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						310,522,000	326,415,000
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						72,660,000	83,478,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						72,492,000	83,200,000
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						635,420,000	633,694,000
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						632,492,000	630,135,000
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						1,212,134,000	1,220,873,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						1,207,607,000	1,214,962,000
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						79,763,000	86,735,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						79,759,000	86,685,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						422,982,000	412,637,000
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						421,280,000	409,033,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	57,000	88,000	$ 107,000	211,000	501,000
Gross loans						33,132,000	38,404,000
Less [Abstract]
Allowance for loan losses	751,000	710,000	693,000	642,000	642,000	716,000	693,000	733,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	751,000	710,000	693,000	642,000	642,000
Losses charged off	(135,000)	(109,000)	(237,000)	(222,000)	(664,000)
Recoveries	43,000	44,000	153,000	102,000	214,000
Balance, end of period	716,000	733,000	716,000	733,000	693,000
Ending Balance [Abstract]
Individually evaluated for impairment						1,000	0	0
Collectively evaluated for impairment						715,000	693,000	733,000
Ending Balance [Abstract]
Individually evaluated for impairment						248,000	213,000	21,000
Collectively evaluated for impairment						35,611,000	41,644,000	41,656,000
Loans Receivable, Net						35,859,000	41,857,000	41,677,000
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						32,814,000	38,028,000
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						85,338,000	77,602,000
Ending Balance [Abstract]
Loans and Leases Receivable, Including Held for Sale, Net of Deferred Income						84,174,000	77,284,000
Agricultural and Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						203,300,000	213,000,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ (9,700,000)
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						164,700,000	171,300,000
Less [Abstract]
Increase (Decrease) in loans receivable			$ (6,600,000)
Motels and Hotels Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						120,500,000
Non-residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						145,800,000
Residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans						129,700,000
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)	1,667,000	388,000	$ 3,133,000	613,000	1,467,000
Less [Abstract]
Allowance for loan losses	13,771,000	11,789,000	12,901,000	11,379,000	11,379,000	14,747,000	12,901,000	11,995,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	13,771,000	11,789,000	12,901,000	11,379,000	11,379,000
Losses charged off	(871,000)	(572,000)	(1,483,000)	(612,000)	(747,000)
Recoveries	180,000	390,000	196,000	615,000	802,000
Balance, end of period	14,747,000	11,995,000	14,747,000	11,995,000	12,901,000
Ending Balance [Abstract]
Individually evaluated for impairment						194,000	192,000	297,000
Collectively evaluated for impairment						14,553,000	12,695,000	11,698,000
Ending Balance [Abstract]
Individually evaluated for impairment						5,653,000	1,956,000	1,555,000
Collectively evaluated for impairment						1,241,763,000	1,199,003,000	855,595,000
Loans Receivable, Net						1,253,526,000	1,204,799,000	857,150,000
Agricultural/ Agricultural Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	86,000	179,000	155,000	111,000	933,000
Less [Abstract]
Allowance for loan losses	2,319,000	1,270,000	2,249,000	1,337,000	1,337,000	1,743,000	2,249,000	1,449,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	2,319,000	1,270,000	2,249,000	1,337,000	1,337,000
Losses charged off	(662,000)	0	(662,000)	0	(30,000)
Recoveries	0	0	1,000	1,000	9,000
Balance, end of period	1,743,000	1,449,000	1,743,000	1,449,000	2,249,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	660,000	0
Collectively evaluated for impairment						1,743,000	1,589,000	1,449,000
Ending Balance [Abstract]
Individually evaluated for impairment						261,000	1,345,000	430,000
Collectively evaluated for impairment						202,620,000	211,168,000	194,384,000
Loans Receivable, Net						202,881,000	212,513,000	194,814,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	23,000	56,000	169,000	72,000	113,000
Less [Abstract]
Allowance for loan losses	978,000	926,000	$ 874,000	994,000	994,000	969,000	874,000	924,000
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	978,000	926,000	$ 874,000	994,000	994,000
Losses charged off	(50,000)	(58,000)	(99,000)	(142,000)	(234,000)
Recoveries	18,000	0	25,000	0	1,000
Balance, end of period	969,000	924,000	969,000	924,000	874,000
Ending Balance [Abstract]
Individually evaluated for impairment						47,000	6,000	0
Collectively evaluated for impairment						922,000	868,000	924,000
Ending Balance [Abstract]
Individually evaluated for impairment						1,494,000	1,752,000	0
Collectively evaluated for impairment						331,874,000	360,825,000	221,546,000
Loans Receivable, Net						333,368,000	366,823,000	221,546,000
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	7,000	22,000	(2,000)	(161,000)	(188,000)
Less [Abstract]
Allowance for loan losses	27,000	41,000	36,000	224,000	224,000	34,000	36,000	63,000
Allowance for Loan Losses [Abstract]
Balance, beginning of period	27,000	41,000	36,000	224,000	224,000
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Balance, end of period	$ 34,000	$ 63,000	$ 34,000	$ 63,000	$ 36,000
Ending Balance [Abstract]
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						34,000	36,000	63,000
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						6,110,000	8,072,000
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	14,000	0
Ending Balance [Abstract]
Financing Receivable, Net						6,110,000	8,086,000	0
Receivables Acquired with Deteriorated Credit Quality [Member] | 1-4 Family residential properties
Ending Balance [Abstract]
Financing Receivable, Net						0	827,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Multifamily residential properties
Ending Balance [Abstract]
Financing Receivable, Net						3,396,000	3,419,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial loans
Ending Balance [Abstract]
Financing Receivable, Net						16,000	24,000
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						0	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial/ Commercial Real Estate
Ending Balance [Abstract]
Financing Receivable, Allowance for Credit Losses						0	14,000	0
Ending Balance [Abstract]
Financing Receivable, Net						6,110,000	3,840,000	0
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						0	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						0	4,246,000	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

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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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The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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The face amount of loans that will be sold to other entities.

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