Fair Value Disclosures, Quantitative Information About Level 3 (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impaired Loans Commercial [Member]
Ranges and Weighted Average [Abstract]
Total Impaired collateral value	$ 400,000	$ 700,000
Impaired Loans Commercial [Member] | Minimum [Member]
Ranges and Weighted Average [Abstract]
Discount rate	5.00%	20.00%
Impaired Loans Commercial [Member] | Maximum [Member]
Ranges and Weighted Average [Abstract]
Discount rate	97.00%	80.00%
Installment [Member]
Ranges and Weighted Average [Abstract]
Total Impaired collateral value	$ 200,000
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Significant Un-observable Inputs (Level 3) [Member]
Asset Fair Value [Abstract]
Servicing asset fair value	$ 19,909,000	$ 21,400,000
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Present Value of Net Servicing Revenue [Member] | Significant Un-observable Inputs (Level 3) [Member] | Float Rate [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	0.0229	0.0257
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Minimum [Member] | Significant Un-observable Inputs (Level 3) [Member] | Cost to Service [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	66	68
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Minimum [Member] | Significant Un-observable Inputs (Level 3) [Member] | Ancillary Income [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	20	20
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Minimum [Member] | Present Value of Net Servicing Revenue [Member] | Significant Un-observable Inputs (Level 3) [Member] | Discount Rate [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	0.1	0.1000
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Maximum [Member] | Significant Un-observable Inputs (Level 3) [Member] | Cost to Service [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	217	216
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Maximum [Member] | Significant Un-observable Inputs (Level 3) [Member] | Ancillary Income [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	36	36
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Maximum [Member] | Present Value of Net Servicing Revenue [Member] | Significant Un-observable Inputs (Level 3) [Member] | Discount Rate [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	0.13	0.1300
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Weighted Average [Member] | Significant Un-observable Inputs (Level 3) [Member] | Cost to Service [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	80	81
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Weighted Average [Member] | Significant Un-observable Inputs (Level 3) [Member] | Ancillary Income [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	23	23
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Weighted Average [Member] | Present Value of Net Servicing Revenue [Member] | Significant Un-observable Inputs (Level 3) [Member] | Discount Rate [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	0.1014	0.1015
Recurring Basis [Member] | Capitalized Mortgage Loan Servicing Rights [Member] | Weighted Average [Member] | Present Value of Net Servicing Revenue [Member] | Significant Un-observable Inputs (Level 3) [Member] | Float Rate [Member]
Ranges and Weighted Average [Abstract]
Servicing asset measurement input	0.0229	0.0257
Nonrecurring Basis [Member] | Impaired Loans Commercial [Member] | Significant Un-observable Inputs (Level 3) [Member]
Asset Fair Value [Abstract]
Impaired loans fair value	$ 1,654,000	$ 2,566,000
Nonrecurring Basis [Member] | Impaired Loans Commercial [Member] | Minimum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	(0.480)	(0.325)
Nonrecurring Basis [Member] | Impaired Loans Commercial [Member] | Maximum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	0.600	0.600
Nonrecurring Basis [Member] | Impaired Loans Commercial [Member] | Weighted Average [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	(0.051)	(0.019)
Nonrecurring Basis [Member] | Impaired Loans Mortgage [Member] | Significant Un-observable Inputs (Level 3) [Member]
Asset Fair Value [Abstract]
Impaired loans fair value	$ 2,060,000	$ 905,000
Nonrecurring Basis [Member] | Impaired Loans Mortgage [Member] | Minimum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	(0.412)	(0.401)
Nonrecurring Basis [Member] | Impaired Loans Mortgage [Member] | Maximum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	0.504	0.256
Nonrecurring Basis [Member] | Impaired Loans Mortgage [Member] | Weighted Average [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Impaired loans measurement input	(0.019)	0.007
Nonrecurring Basis [Member] | Other Real Estate Mortgage [Member] | Significant Un-observable Inputs (Level 3) [Member]
Asset Fair Value [Abstract]
Other real estate fair value	$ 188,000	$ 154,000
Nonrecurring Basis [Member] | Other Real Estate Mortgage [Member] | Minimum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Other real estate measurement input	(0.309)	0
Nonrecurring Basis [Member] | Other Real Estate Mortgage [Member] | Maximum [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Other real estate measurement input	0.779	0.341
Nonrecurring Basis [Member] | Other Real Estate Mortgage [Member] | Weighted Average [Member] | Sales Comparison Approach [Member] | Significant Un-observable Inputs (Level 3) [Member] | Adjustment for Differences Between Comparable Sales [Member]
Ranges and Weighted Average [Abstract]
Other real estate measurement input	0.047	0.112