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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses (PCI Loans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 15, 2018	May 01, 2018	Dec. 31, 2017
Carrying Amount [Abstract]
Loans Receivable, Net	$ 2,695,347,000	$ 2,644,519,000
Loans and Leases Receivable, Net Amount	2,666,616,000	2,616,822,000
Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	4,951,000	2,937,000
Financing Receivable, Allowance for Credit Losses	365,000	1,235,000			$ 9,000
Financing Receivable, Allowance for Credit Losses Reversed	1,229,000	65,000
Loans and Leases Receivable, Net Amount	4,586,000	1,702,000
Contractual Payments at Acquisition [Abstract]
Financing Receivable, Net	4,951,000	15,623,000			259,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	910,000
Construction Loans [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	94,142,000	50,619,000
Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	256,000	872,000
1-4 Family residential properties
Carrying Amount [Abstract]
Loans Receivable, Net	336,427,000	373,518,000
1-4 Family residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	371,000	206,000
Multifamily residential properties
Carrying Amount [Abstract]
Loans Receivable, Net	153,948,000	184,051,000
Multifamily residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	2,077,000	891,000
Commercial real estate
Carrying Amount [Abstract]
Loans Receivable, Net	995,702,000	906,850,000
Commercial real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	2,247,000	946,000
Loans secured by real estate
Carrying Amount [Abstract]
Loans Receivable, Net	1,820,460,000	1,746,738,000
Loans secured by real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	4,951,000	2,915,000
Agricultural Loans [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	136,124,000	135,877,000
Agricultural Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	0	4,000
Commercial and industrial loans
Carrying Amount [Abstract]
Loans Receivable, Net	528,973,000	557,011,000
Commercial and industrial loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	0	15,000
Consumer Loan [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	83,183,000	91,516,000
Consumer Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	0	3,000
Financing Receivable, Allowance for Credit Losses	0	0			0
Contractual Payments at Acquisition [Abstract]
Financing Receivable, Net	$ 0	$ 3,000			$ 0
First BancTrust [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Contractual Payments at Acquisition [Abstract]
Business Combination, Acquired Receivables, Gross Contractual Amount				$ 20,357,000
Certain Loans Acquired In A Transfer. Nonaccretable Difference				(4,231,000)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition				16,126,000
Certain Loans Acquired in Transfer, Accretable Yield				0
Business Combination, Acquired Receivable, Fair Value				$ 16,126,000
SCB Bancorp [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Contractual Payments at Acquisition [Abstract]
Business Combination, Acquired Receivables, Gross Contractual Amount			$ 3,282,000
Certain Loans Acquired In A Transfer. Nonaccretable Difference			(688,000)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition			2,594,000
Certain Loans Acquired in Transfer, Accretable Yield			0
Business Combination, Acquired Receivable, Fair Value			$ 2,594,000

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The aggregate deficiency of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Financing Receivable, Allowance for Credit Losses Reversed

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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