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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) Loans contract	Jun. 30, 2018 USD ($) Loans contract	Jun. 30, 2019 USD ($) Loans contract	Jun. 30, 2018 USD ($) Loans contract	Dec. 31, 2018 USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 3,125		$ 3,125		$ 3,220
Reserves specific to modified loans	62		62		50
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		$ 0
Defaults on troubled debt restructurings | contract	0	0	0	0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans			2
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment					36
Number of Loans | Loans				1
Pre-Modification Outstanding Recorded Investment				$ 38
Principal Modification				0
Post Modification Outstanding Recorded Investment				38
Real Estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		$ 3,215		$ 3,215
Number of Loans | Loans				2
Pre-Modification Outstanding Recorded Investment				$ 3,216
Principal Modification				0
Post Modification Outstanding Recorded Investment				$ 3,216
Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment					$ 165
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		$ 3,050		$ 3,050
Number of Loans | Loans		1		1
Pre-Modification Outstanding Recorded Investment		$ 3,050		$ 3,050
Principal Modification				0
Post Modification Outstanding Recorded Investment		3,050		3,050
Consumer
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 128		$ 128
Number of Loans | Loans			2
Pre-Modification Outstanding Recorded Investment			$ 132
Principal Modification			0
Post Modification Outstanding Recorded Investment			132
Consumer | Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 115		$ 115
Number of Loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 119
Principal Modification	0
Post Modification Outstanding Recorded Investment	$ 119
Commercial and Real Estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		$ 3,251		$ 3,251
Number of Loans | Loans				3
Pre-Modification Outstanding Recorded Investment				$ 3,254
Principal Modification				0
Post Modification Outstanding Recorded Investment				$ 3,254

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