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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Loans	Dec. 31, 2017 USD ($) Loans	Dec. 31, 2016 USD ($) Loans
Financing Receivable, Modifications [Line Items]
Reserves specific to modified loans	$ 50	$ 36
Additional commitments to lend	0
Outstanding Recorded Investment	$ 3,220	$ 3,551
Defaults on troubled debt restructurings | Loans		0
Real Estate and Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	2	3
Pre-Modification Outstanding Recorded Investment	$ 204	$ 549
Principal Modification	0	0
Post Modification Outstanding Recorded Investment	204	1,125
Outstanding Recorded Investment	$ 191	$ 1,110
Real Estate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 166
Principal Modification	0
Post Modification Outstanding Recorded Investment	166
Outstanding Recorded Investment	$ 161
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	1		2
Pre-Modification Outstanding Recorded Investment	$ 38		$ 45
Principal Modification	0		0
Post Modification Outstanding Recorded Investment	38		45
Outstanding Recorded Investment	$ 30		$ 40

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