Loans (Residential, Home Equity and Consumer Loans Based on Payment Activity) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,018,416		$ 3,081,973
Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,188
2019	34,319
2018	13,103
2017	4,485
2016	2,131
Prior	3,395
Revolving Loans Amortized Cost Basis	2,464
Total	68,085	$ 69,264	81,217
Total			81,429
Consumer Loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8,188
2019	34,295
2018	13,090
2017	4,485
2016	2,128
Prior	3,329
Revolving Loans Amortized Cost Basis	2,433
Total	67,948
Total			81,314
Consumer Loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2019	24
2018	13
2016	3
Prior	66
Revolving Loans Amortized Cost Basis	31
Total	137
Total			115
Home Equity Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2018	34
2017	111
2016	71
Prior	353
Revolving Loans Amortized Cost Basis	223,737
Total	224,306	225,790	225,755
Total			226,775
Home Equity Loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2018	34
2017	111
2016	71
Prior	353
Revolving Loans Amortized Cost Basis	223,437
Total	224,006
Total			226,695
Home Equity Loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Amortized Cost Basis	300
Total	300
Total			80
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,839
2019	31,939
2018	44,932
2017	41,082
2016	36,492
Prior	132,266
Total	293,550	$ 305,002	304,855
Total			305,560
Residential Mortgage Loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,839
2019	31,939
2018	44,932
2017	41,010
2016	36,277
Prior	130,261
Total	291,258
Total			303,065
Residential Mortgage Loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2017	72
2016	215
Prior	2,005
Total	$ 2,292
Total			$ 2,495