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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Loans	Sep. 30, 2017 USD ($) Loans	Sep. 30, 2018 USD ($) Loans contract	Sep. 30, 2017 USD ($) Loans contract	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 3,393		$ 3,393		$ 3,551
Reserves specific to modified loans	189		189		$ 36
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		$ 0
Number of Loans | Loans	0	0
Defaults on troubled debt restructurings | contract			0	0
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 31		$ 31
Number of Loans | Loans			1
Pre-Modification Outstanding Recorded Investment			$ 38
Principal Modification			0
Post Modification Outstanding Recorded Investment			38
Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	163		$ 163
Number of Loans | Loans			1
Pre-Modification Outstanding Recorded Investment			$ 166
Principal Modification			0
Post Modification Outstanding Recorded Investment			166
Real Estate | Agricultural real estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		$ 51		$ 51
Number of Loans | Loans				1
Pre-Modification Outstanding Recorded Investment				$ 59
Principal Modification				0
Post Modification Outstanding Recorded Investment				59
Consumer | Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		62		$ 62
Number of Loans | Loans				1
Pre-Modification Outstanding Recorded Investment				$ 62
Principal Modification				0
Post Modification Outstanding Recorded Investment				66
Real Estate and Consumer
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		$ 113		$ 113
Number of Loans | Loans				2
Pre-Modification Outstanding Recorded Investment				$ 121
Principal Modification				0
Post Modification Outstanding Recorded Investment				$ 125
Commercial and Real Estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 194		$ 194
Number of Loans | Loans			2
Pre-Modification Outstanding Recorded Investment			$ 204
Principal Modification			0
Post Modification Outstanding Recorded Investment			$ 204

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