Fair Value (Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Recurring Basis | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative financial instruments	$ 681	$ 725
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for sale	0	67,224
Derivative financial instruments	0	0
Level 3 | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative financial instruments	681	725
Level 3 | Recurring Basis | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative financial instruments	681	725
Valuation Technique, Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for sale		67,224
Servicing rights	$ 5,621	7,143
Valuation Technique, Discounted Cash Flow | Level 3 | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative financial instruments		$ 725
Valuation Technique, Discounted Cash Flow | Level 3 | Interest rate lock commitments | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0
Valuation Technique, Discounted Cash Flow | Level 3 | Interest rate lock commitments | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.99
Valuation Technique, Discounted Cash Flow | Measurement Input, Closing Ratio | Level 3 | Interest rate lock commitments | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.90	0.91
Valuation Technique, Discounted Cash Flow | Measurement Input, Closing Ratio | Level 3 | Interest rate lock commitments | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0
Valuation Technique, Discounted Cash Flow | Measurement Input, Closing Ratio | Level 3 | Interest rate lock commitments | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.99
Valuation Technique, Modified Appraised Value | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 6,914	$ 6,153
Valuation Technique, Modified Appraised Value | Level 3 | Commercial
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	15,173	12,932
Valuation Technique, Modified Appraised Value | Level 3 | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	4,592	405
Valuation Technique, Modified Appraised Value | Level 3 | Agricultural and Agricultural Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	12,623	11,070
Valuation Technique, Modified Appraised Value | Level 3 | Residential Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	3,088	478
Valuation Technique, Modified Appraised Value | Level 3 | Consumer
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	988	624
Valuation Technique, Modified Appraised Value | Level 3 | Recurring Basis | Premises, Furniture and Equipment Held for Sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	$ 2,967	$ 7,258
Valuation Technique, Modified Appraised Value | Measurement Input, Appraised Value | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Measurement Input, Appraised Value | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	10.00%	10.00%
Valuation Technique, Modified Appraised Value | Measurement Input, Appraised Value | Level 3 | Premises, Furniture and Equipment Held for Sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Measurement Input, Appraised Value | Level 3 | Premises, Furniture and Equipment Held for Sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	10.00%	10.00%
Valuation Technique, Modified Appraised Value | Residential Real Estate | Measurement Input, Appraised Value | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Residential Real Estate | Measurement Input, Appraised Value | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	25.00%	24.00%
Valuation Technique, Modified Appraised Value | Consumer | Measurement Input, Discount Rate | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Consumer | Measurement Input, Discount Rate | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	10.00%	14.00%
Valuation Technique, Modified Appraised Value | Commercial | Measurement Input, Appraised Value | Level 3 | Commercial | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Commercial | Measurement Input, Appraised Value | Level 3 | Commercial | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	25.00%	8.00%
Valuation Technique, Modified Appraised Value | Commercial | Measurement Input, Appraised Value | Level 3 | Commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%	0.00%
Valuation Technique, Modified Appraised Value | Commercial | Measurement Input, Appraised Value | Level 3 | Commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	14.00%	19.00%
Valuation Technique, Modified Appraised Value | Agricultural and Agricultural Real Estate | Measurement Input, Appraised Value | Level 3 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	0.00%
Valuation Technique, Modified Appraised Value | Agricultural and Agricultural Real Estate | Measurement Input, Appraised Value | Level 3 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Pretax discount rate (percent)	15.00%	24.00%
Interest rate lock commitments | Valuation Technique, Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative financial instruments	$ 681