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Business Combinations Narrative (Details)
 3 Months Ended 12 Months Ended
Nov. 15, 2018
USD ($)
$ / shares
shares
May 01, 2018
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
$ / shares
Business Acquisition [Line Items]            
Common stock, par value (in dollars per share) | $ / shares     $ 4.00   $ 4.00 $ 4
Goodwill, Acquired During Period     $ 18,351,000      
SCB Bancorp [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 12,298,000          
Percent Of Acquiree Outstanding Stock Being Acquired In Merger         1  
Right To Receive Value of Cash Option | $ / shares $ 307.93          
Right To Receive Value Of Share Option | shares 8.0228          
Aggregate Total Of Cash Paid In Business Combination $ 19,046,000          
Common stock, par value (in dollars per share) | $ / shares $ 7.50          
Dividends $ 25,000,000          
Shares, Issued | shares 1,330,571          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 478,629,000          
Goodwill, Acquired During Period         $ 18,400,000  
Business Acquisition, Transaction Costs     3,700,000   3,700,000  
Business Acquisition, YTD Transaction Costs     2,800,000   $ 2,800,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 347,971,000          
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans 247,561,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 65,095,000          
Finite-Lived Intangible Asset, Useful Life   10 years        
SCB Bancorp-Ag Services [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 4,200,000          
Finite-Lived Intangible Asset, Useful Life   12 years        
SCB Bancorp-Insurance [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 8,100,000          
Finite-Lived Intangible Asset, Useful Life   11 years        
First BancTrust [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   $ 4,735,000        
Percent Of Acquiree Outstanding Stock Being Acquired In Merger         1  
Right To Receive Value of Cash Option | $ / shares   $ 5.00        
Right To Receive Value Of Share Option | shares   0.800        
Aggregate Total Of Cash Paid In Business Combination   $ 10,275,000        
Common stock, par value (in dollars per share) | $ / shares   $ 0.01        
Shares, Issued | shares   1,643,900        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 501,285,000        
Goodwill, Acquired During Period       $ 26,491,000 $ 26,500,000  
Business Acquisition, Transaction Costs     5,200,000   5,200,000  
Business Acquisition, YTD Transaction Costs     $ 191,000   $ 191,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   385,624,000        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   363,281,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 20,598,000        
Sale of Stock, Price Per Share | $ / shares   $ 37.32        
Finite-Lived Intangible Asset, Useful Life   10 years        
Fair Value Adjustments [Member] | SCB Bancorp [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 11,070,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 21,322,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 343,000          
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans 7,868,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 0          
Fair Value Adjustments [Member] | First BancTrust [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   $ 1,451,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   26,432,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   1,301,000        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   7,875,000        
Acquired Book Value [Member] | SCB Bancorp [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 1,228,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 457,307,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits 348,314,000          
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans 255,429,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 65,095,000          
Acquired Book Value [Member] | First BancTrust [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   6,186,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   474,853,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits   384,323,000        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   371,156,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 20,598,000