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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Loans	Dec. 31, 2018 USD ($) Loans	Dec. 31, 2017 USD ($) Loans
Financing Receivable, Modifications [Line Items]
Reserves specific to modified loans	$ 38	$ 50
Additional commitments to lend	0
Outstanding Recorded Investment	$ 2,362	$ 3,220
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
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans		1
Pre-Modification Outstanding Recorded Investment		$ 38
Principal Modification		0
Post Modification Outstanding Recorded Investment		38
Outstanding Recorded Investment		30
Real Estate | Agricultural real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans			1
Pre-Modification Outstanding Recorded Investment			$ 59
Post Modification Outstanding Recorded Investment			59
Outstanding Recorded Investment			$ 51
Real Estate | Commercial real estate
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
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	3		2
Pre-Modification Outstanding Recorded Investment	$ 532		$ 490
Principal Modification	0		0
Post Modification Outstanding Recorded Investment	532		1,066
Outstanding Recorded Investment	$ 446		$ 1,059

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