Business Combinations Assets Acquired and Liabilities Assumed (Details) - USD ($)		3 Months Ended	9 Months Ended
	Sep. 08, 2016	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand	$ 59,320,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(109,174,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(438,265,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	0
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(1,987,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	(11,581,000)
Business Acquisition, Goodwill, Non-deductible Amount	19,143,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4,660,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	(26,849,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	670,979,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	536,686,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	23,263,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	15,113,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	3,269,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	4,177,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	582,508,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	88,471,000
Aggregate Total Of Cash Paid In Business Combination	22,545,000
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	65,926,000
Business Combination, Value of Total Consideration Paid	88,471,000
Business Combination, Aggregate Acquisition Costs			$ 3,302,000
Business Combination, Acquisition Related Costs		$ 1,962,000
Acquired Book Value [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand	59,320,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(109,911,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(448,668,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	(6,928,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(2,741,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	(9,618,000)
Business Acquisition, Goodwill, Non-deductible Amount	11,385,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	99,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	(23,974,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	658,788,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	534,692,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	23,263,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	15,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	4,000,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	2,103,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	579,058,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	79,730,000
Fair Value Adjustment [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand	0
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(737,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(10,403,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	(6,928,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(754,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	1,963,000
Business Acquisition, Goodwill, Non-deductible Amount	7,758,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4,561,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	2,875,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	12,191,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,994,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	113,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	(731,000)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	2,074,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	3,450,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	8,741,000
Fair Value Adjustments, Accretable portion [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	$ 8,400,000