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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Loans contract	Mar. 31, 2016 USD ($) Loans contract	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0
Outstanding Recorded Investment	3,058		$ 3,109
Reserves specific to modified loans	$ 73		$ 82
Defaults on troubled debt restructurings | contract	0	0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	2	2
Pre-Modification Outstanding Recorded Investment	$ 121	$ 45
Principal Modification	0	0
Post Modification Outstanding Recorded Investment	125	45
Outstanding Recorded Investment	$ 125	$ 45
Agricultural real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 59
Principal Modification	0
Post Modification Outstanding Recorded Investment	59
Outstanding Recorded Investment	$ 59
Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 62
Principal Modification	0
Post Modification Outstanding Recorded Investment	66
Outstanding Recorded Investment	$ 66

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+ 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=49124121&loc=SL6953676-111524

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-Topic 310
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-Section 50
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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
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