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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Loans	Jun. 30, 2017 USD ($) Loans	Jun. 30, 2018 USD ($) Loans contract	Jun. 30, 2017 USD ($) Loans contract	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 6,622		$ 6,622		$ 3,551
Reserves specific to modified loans	195		195		$ 36
Loans and Leases Receivable, Impaired, Commitment to Lend	0		$ 0
Number of Loans | Loans		0
Defaults on troubled debt restructurings | contract			0	0
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	36		$ 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		$ 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	$ 59	$ 3,050	$ 59
Number of Loans | Loans	1		1	1
Pre-Modification Outstanding Recorded Investment	$ 3,050		$ 3,050	$ 59
Principal Modification	0		0	0
Post Modification Outstanding Recorded Investment	3,050		3,050	59
Consumer | Equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment		64		$ 64
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		$ 123		$ 123
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	$ 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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