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Loans and Allowance for Loan and Lease Losses - Schedule of Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Accounts Notes And Loans Receivable [Line Items]
Pre Modification Recorded Investment | $		$ 18,214
Number of Loans | loan		31
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Pre Modification Recorded Investment | $	$ 8,831	$ 16,612	$ 1,544
Number of Loans | loan	8	27	4
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Pre Modification Recorded Investment | $		$ 809
Number of Loans | loan		3
Farmland
Accounts Notes And Loans Receivable [Line Items]
Pre Modification Recorded Investment | $		$ 793
Number of Loans | loan		1

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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