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Loans and Allowance for Loan Losses (Details 10) - Capstone Bancshares Inc. [Member] - Purchased Credit Impaired Loans [Member] $ in Thousands	Dec. 31, 2017 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractual principal and interest at acquisition	$ 25,288
Nonaccretable difference	5,725
Expected cash flows at acquisition	19,563
Accretable yield	2,581
Basis in PCI loans at acquisition-estimated fair value	$ 16,982

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- Definition

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Nonaccretable Difference

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- Definition

Amount of 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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+ References

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-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
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Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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