Loans (Commercial Loan Portfolio Categorized by Internally Assigned Asset Classification) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
2020	$ 44,451
2019	123,012
2018	100,571
2017	70,376
2016	15,948
Prior	30,725
Revolving Loans Amortized Cost Basis	203,785
Revolving Loans Converted to Term	0
Total	588,868
Commercial Business [Member] | Uncriticized [Member]
Financing Receivable Recorded Investment [Line Items]
2020	44,451
2019	120,112
2018	99,167
2017	67,821
2016	15,277
Prior	26,344
Revolving Loans Amortized Cost Basis	195,088
Revolving Loans Converted to Term	0
Total	568,260
Commercial Business [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	2,706
2018	231
2017	1,688
2016	218
Prior	181
Revolving Loans Amortized Cost Basis	4,284
Revolving Loans Converted to Term	0
Total	9,308
Commercial Business [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	194
2018	1,173
2017	867
2016	453
Prior	4,200
Revolving Loans Amortized Cost Basis	4,407
Revolving Loans Converted to Term	0
Total	11,294
Commercial Business [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	6
Revolving Loans Converted to Term	0
Total	6
Commercial Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
2020	46,283
2019	284,806
2018	214,901
2017	213,122
2016	110,695
Prior	236,841
Revolving Loans Amortized Cost Basis	728
Revolving Loans Converted to Term	0
Total	1,107,376
Commercial Mortgage [Member] | Uncriticized [Member]
Financing Receivable Recorded Investment [Line Items]
2020	46,283
2019	282,360
2018	214,637
2017	211,456
2016	109,525
Prior	232,204
Revolving Loans Amortized Cost Basis	529
Revolving Loans Converted to Term	0
Total	1,096,994
Commercial Mortgage [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	0
2018	35
2017	41
2016	1,013
Prior	250
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	1,339
Commercial Mortgage [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	2,446
2018	229
2017	1,625
2016	157
Prior	4,387
Revolving Loans Amortized Cost Basis	199
Revolving Loans Converted to Term	0
Total	9,043
Commercial Mortgage [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	$ 0