Business Combinations Assets Acquired and Liabilities Assumed (Details) - USD ($)			3 Months Ended
	Nov. 15, 2018	May 01, 2018	Mar. 31, 2019
SCB Bancorp [Member]
Business Acquisition [Line Items]
Cash and due from banks	$ 65,112,000
Investment Securities	(97,504,000)
Loans	(247,561,000)
Allowance for loan losses	0
Other real estate owned	(438,000)
Premises and equipment	(11,068,000)
Goodwill	18,356,000
Core deposit intangible	7,269,000
Other Intangibles	12,298,000
Other assets	(19,023,000)
Total assets acquired	478,629,000
Deposits	347,971,000
Securities sold under agreements to repurchase	21,180,000
FHLB advances	18,971,000
Other borrowings	7,724,000
Junior subordinated debentures	0
Other liabilities	15,477,000
Total liabilities assumed	(411,323,000)
Net assets acquired	67,306,000
Aggregate Total Of Cash Paid In Business Combination	19,046,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	48,260,000
Business Combination, Value of Total Consideration Paid	$ 67,306,000
Business Combination, Acquisition Related Costs			$ 1,200,000
Business Acquisition YTD Transaction Costs			283,000
Finite-Lived Intangible Asset, Useful Life	10 years
SCB Bancorp-Ag Services [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
SCB Bancorp-Insurance [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	11 years
First BancTrust [Member]
Business Acquisition [Line Items]
Cash and due from banks		$ 20,598,000
Investment Securities		(59,586,000)
Loans		(363,281,000)
Allowance for loan losses		0
Other real estate owned		(535,000)
Premises and equipment		(9,437,000)
Goodwill		26,491,000
Core deposit intangible		5,224,000
Other assets		(16,133,000)
Total assets acquired		501,285,000
Deposits		385,624,000
FHLB advances		30,672,000
Junior subordinated debentures		4,735,000
Other liabilities		8,629,000
Total liabilities assumed		(429,660,000)
Net assets acquired		71,625,000
Aggregate Total Of Cash Paid In Business Combination		10,275,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		61,350,000
Business Combination, Value of Total Consideration Paid		$ 71,625,000
Business Combination, Acquisition Related Costs			5,100,000
Business Acquisition YTD Transaction Costs			$ 153,000
Finite-Lived Intangible Asset, Useful Life		10 years
Acquired Book Value [Member] | SCB Bancorp [Member]
Business Acquisition [Line Items]
Cash and due from banks	$ 65,112,000
Investment Securities	(97,545,000)
Loans	(255,429,000)
Allowance for loan losses	(4,491,000)
Other real estate owned	(783,000)
Premises and equipment	(10,115,000)
Goodwill	6,745,000
Core deposit intangible	0
Other Intangibles	1,228,000
Other assets	(24,858,000)
Total assets acquired	457,324,000
Deposits	348,314,000
Securities sold under agreements to repurchase	21,180,000
FHLB advances	19,000,000
Other borrowings	7,724,000
Junior subordinated debentures	0
Other liabilities	15,477,000
Total liabilities assumed	(411,695,000)
Net assets acquired	45,629,000
Acquired Book Value [Member] | First BancTrust [Member]
Business Acquisition [Line Items]
Cash and due from banks		$ 20,598,000
Investment Securities		(59,906,000)
Loans		(371,156,000)
Allowance for loan losses		(4,412,000)
Other real estate owned		(547,000)
Premises and equipment		(10,126,000)
Goodwill		543,000
Core deposit intangible		0
Other assets		(16,389,000)
Total assets acquired		474,853,000
Deposits		384,323,000
FHLB advances		31,000,000
Junior subordinated debentures		6,186,000
Other liabilities		8,665,000
Total liabilities assumed		(430,174,000)
Net assets acquired		44,679,000
Fair Value Adjustment [Member] | SCB Bancorp [Member]
Business Acquisition [Line Items]
Cash and due from banks	0
Investment Securities	(41,000)
Loans	(7,868,000)
Allowance for loan losses	(4,491,000)
Other real estate owned	(345,000)
Premises and equipment	(953,000)
Goodwill	11,611,000
Core deposit intangible	7,269,000
Other Intangibles	11,070,000
Other assets	5,835,000
Total assets acquired	21,305,000
Deposits	(343,000)
Securities sold under agreements to repurchase	0
FHLB advances	(29,000)
Other borrowings	0
Junior subordinated debentures	0
Other liabilities	0
Total liabilities assumed	372,000
Net assets acquired	21,677,000
Fair Value Adjustment [Member] | SCB Bancorp-Ag Services [Member]
Business Acquisition [Line Items]
Other Intangibles	4,200,000
Fair Value Adjustment [Member] | SCB Bancorp-Insurance [Member]
Business Acquisition [Line Items]
Other Intangibles	8,100,000
Fair Value Adjustment [Member] | First BancTrust [Member]
Business Acquisition [Line Items]
Cash and due from banks		0
Investment Securities		(320,000)
Loans		(7,875,000)
Allowance for loan losses		(4,412,000)
Other real estate owned		(12,000)
Premises and equipment		(689,000)
Goodwill		25,948,000
Core deposit intangible		5,224,000
Other Intangibles		(5,224,000)
Other assets		(256,000)
Total assets acquired		26,432,000
Deposits		1,301,000
FHLB advances		(328,000)
Junior subordinated debentures		(1,451,000)
Other liabilities		(36,000)
Total liabilities assumed		(514,000)
Net assets acquired		26,946,000
Fair Value Adjustments, Accretable portion [Member] | SCB Bancorp [Member]
Business Acquisition [Line Items]
Loans	$ 7,200,000
Fair Value Adjustments, Accretable portion [Member] | First BancTrust [Member]
Business Acquisition [Line Items]
Loans		$ 3,600,000