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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Loans	Dec. 31, 2016 USD ($) Loans	Dec. 31, 2015 USD ($) Loans	Jun. 30, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Reserves specific to modified loans	$ 36	$ 82
Additional commitments to lend	0
Outstanding Recorded Investment	$ 3,551	$ 3,109
Defaults on troubled debt restructurings | Loans		0
Real Estate and Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	3
Pre-Modification Outstanding Recorded Investment	$ 549
Principal Modification	0
Post Modification Outstanding Recorded Investment	1,125
Outstanding Recorded Investment	$ 1,110
Real Estate | 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	$ 51
Consumer | Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	2
Pre-Modification Outstanding Recorded Investment	$ 490
Principal Modification	0
Post Modification Outstanding Recorded Investment	1,066
Outstanding Recorded Investment	$ 1,059
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans		2	2
Pre-Modification Outstanding Recorded Investment		$ 45	$ 42
Principal Modification		0	0
Post Modification Outstanding Recorded Investment		$ 45	42
Outstanding Recorded Investment			$ 30	$ 40

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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