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Business Combinations Assets Acquired and Liabilities Assumed (Details) - First Clover Leaf [Member] - USD ($)
 3 Months Ended 6 Months Ended
Sep. 08, 2016
Jun. 30, 2017
Jun. 30, 2017
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 16,785,000    
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 (27,133,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 668,905,000    
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 2,103,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 580,434,000    
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     $ 3,293,000
Business Combination, Acquisition Related Costs   $ 1,953,000  
Finite-Lived Intangible Asset, Useful Life     10 years
Acquired Book Value [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]      
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 5,400,000    
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 3,159,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 10,117,000    
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 0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 1,376,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 8,741,000    
Fair Value Adjustments, Accretable portion [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans $ 8,400,000