Business Combinations Narrative (Details)			3 Months Ended		12 Months Ended
	Nov. 15, 2018 USD ($) $ / shares shares	May 01, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 4.00		$ 4.00	$ 4
Goodwill, Acquired During Period			$ 18,636,000
SCB Bancorp [Member]
Business Acquisition [Line Items]
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
Shares, Issued | shares	1,330,571
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 479,056,000
Goodwill, Acquired During Period					$ 18,600,000
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	65,112,000
First BancTrust [Member]
Business Acquisition [Line Items]
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 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
Acquired Book Value [Member] | SCB Bancorp [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	457,324,000
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	$ 65,112,000
Acquired Book Value [Member] | First BancTrust [Member]
Business Acquisition [Line Items]
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