Loans (Loans By Risk Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	$ 2,911,437	$ 2,876,147	$ 2,873,525
Financing Receivable, Originated in Current Fiscal Year	122,131
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	492,999
Financing Receivable, Originated Two Years before Latest Fiscal Year	372,855
Financing Receivable, Originated Three Years before Latest Fiscal Year	325,707
Financing Receivable, Originated Four Years before Latest Fiscal Year	280,902
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	816,789
Financing Receivable, Revolving	500,054
Financing Receivable Revolving Loans Converted to Term Loan	61,109
Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	110,865		88,518
Financing Receivable, Originated in Current Fiscal Year	4,092
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	38,085
Financing Receivable, Originated Two Years before Latest Fiscal Year	30,264
Financing Receivable, Originated Three Years before Latest Fiscal Year	34,567
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,277
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,928
Financing Receivable, Revolving	652
Financing Receivable Revolving Loans Converted to Term Loan	1,085
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	897,817		833,238
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	654,530		662,993
Financing Receivable, Originated in Current Fiscal Year	34,844
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	124,028
Financing Receivable, Originated Two Years before Latest Fiscal Year	85,173
Financing Receivable, Originated Three Years before Latest Fiscal Year	111,278
Financing Receivable, Originated Four Years before Latest Fiscal Year	121,240
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	288,657
Financing Receivable, Revolving	132,597
Financing Receivable Revolving Loans Converted to Term Loan	20,932
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	654,530		662,993
Financing Receivable, Originated in Current Fiscal Year	27,851
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	117,693
Financing Receivable, Originated Two Years before Latest Fiscal Year	87,303
Financing Receivable, Originated Three Years before Latest Fiscal Year	57,294
Financing Receivable, Originated Four Years before Latest Fiscal Year	55,365
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	95,047
Financing Receivable, Revolving	213,977
Financing Receivable Revolving Loans Converted to Term Loan	34,392
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	625,366		661,476
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	128,011		132,704
Financing Receivable, Originated in Current Fiscal Year	3,209
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14,712
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,145
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,905
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,208
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	48,551
Financing Receivable, Revolving	16,281
Financing Receivable Revolving Loans Converted to Term Loan	4,510
Consumer, direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	418,066		417,185
Financing Receivable, Originated in Current Fiscal Year	34,969
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	122,879
Financing Receivable, Originated Two Years before Latest Fiscal Year	104,388
Financing Receivable, Originated Three Years before Latest Fiscal Year	61,567
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,552
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	9,438
Financing Receivable, Revolving	55,273
Financing Receivable Revolving Loans Converted to Term Loan	0
Consumer, Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	76,172		76,533
Financing Receivable, Originated in Current Fiscal Year	7,736
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23,732
Financing Receivable, Originated Two Years before Latest Fiscal Year	17,511
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,697
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,335
Financing Receivable, Revolving	10,123
Financing Receivable Revolving Loans Converted to Term Loan	0
Bank Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	610		878
Financing Receivable, Originated in Current Fiscal Year	610
Total Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	2,911,437		$ 2,873,525
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	625,366
Financing Receivable, Originated in Current Fiscal Year	8,820
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	51,870
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,071
Financing Receivable, Originated Three Years before Latest Fiscal Year	37,058
Financing Receivable, Originated Four Years before Latest Fiscal Year	54,563
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	368,833
Financing Receivable, Revolving	71,151
Financing Receivable Revolving Loans Converted to Term Loan	190
Pass [Member] | Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	109,215
Financing Receivable, Originated in Current Fiscal Year	4,092
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	38,085
Financing Receivable, Originated Two Years before Latest Fiscal Year	30,264
Financing Receivable, Originated Three Years before Latest Fiscal Year	34,158
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,277
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	839
Financing Receivable, Revolving	500
Financing Receivable Revolving Loans Converted to Term Loan	1,085
Pass [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	846,524
Financing Receivable, Originated in Current Fiscal Year	34,844
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	123,054
Financing Receivable, Originated Two Years before Latest Fiscal Year	83,513
Financing Receivable, Originated Three Years before Latest Fiscal Year	107,026
Financing Receivable, Originated Four Years before Latest Fiscal Year	114,584
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	261,144
Financing Receivable, Revolving	122,359
Financing Receivable Revolving Loans Converted to Term Loan	20,711
Pass [Member] | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	631,456
Financing Receivable, Originated in Current Fiscal Year	27,851
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	115,319
Financing Receivable, Originated Two Years before Latest Fiscal Year	86,120
Financing Receivable, Originated Three Years before Latest Fiscal Year	53,941
Financing Receivable, Originated Four Years before Latest Fiscal Year	54,880
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	89,840
Financing Receivable, Revolving	203,505
Financing Receivable Revolving Loans Converted to Term Loan	32,037
Pass [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	128,011
Financing Receivable, Originated in Current Fiscal Year	3,209
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14,712
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,145
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,905
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,208
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	48,551
Financing Receivable, Revolving	16,281
Financing Receivable Revolving Loans Converted to Term Loan	4,510
Pass [Member] | Consumer, direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	418,066
Financing Receivable, Originated in Current Fiscal Year	34,969
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	122,879
Financing Receivable, Originated Two Years before Latest Fiscal Year	104,388
Financing Receivable, Originated Three Years before Latest Fiscal Year	61,567
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,552
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	9,438
Financing Receivable, Revolving	55,273
Financing Receivable Revolving Loans Converted to Term Loan	0
Pass [Member] | Consumer, Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	76,172
Financing Receivable, Originated in Current Fiscal Year	7,736
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23,732
Financing Receivable, Originated Two Years before Latest Fiscal Year	17,511
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,697
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,335
Financing Receivable, Revolving	10,123
Financing Receivable Revolving Loans Converted to Term Loan	0
Pass [Member] | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	625,080
Financing Receivable, Originated in Current Fiscal Year	8,820
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	51,870
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,071
Financing Receivable, Originated Three Years before Latest Fiscal Year	37,058
Financing Receivable, Originated Four Years before Latest Fiscal Year	54,563
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	368,621
Financing Receivable, Revolving	71,077
Financing Receivable Revolving Loans Converted to Term Loan	190
Special Mention [Member] | Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	152
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	152
Financing Receivable Revolving Loans Converted to Term Loan	0
Special Mention [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	15,280
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	44
Financing Receivable, Originated Two Years before Latest Fiscal Year	584
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,054
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,570
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,394
Financing Receivable, Revolving	1,634
Financing Receivable Revolving Loans Converted to Term Loan	125
Special Mention [Member] | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	6,659
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	205
Financing Receivable, Originated Two Years before Latest Fiscal Year	181
Financing Receivable, Originated Three Years before Latest Fiscal Year	168
Financing Receivable, Originated Four Years before Latest Fiscal Year	8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,396
Financing Receivable, Revolving	4,701
Financing Receivable Revolving Loans Converted to Term Loan	15
Special Mention [Member] | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	2
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2
Financing Receivable, Revolving	0
Financing Receivable Revolving Loans Converted to Term Loan	0
Substandard [Member] | Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	1,498
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	409
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,089
Financing Receivable, Revolving	0
Financing Receivable Revolving Loans Converted to Term Loan	0
Substandard [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	35,894
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	930
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,076
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,198
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,086
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	21,000
Financing Receivable, Revolving	8,604
Financing Receivable Revolving Loans Converted to Term Loan	96
Substandard [Member] | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	15,832
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,169
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,002
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,185
Financing Receivable, Originated Four Years before Latest Fiscal Year	470
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,578
Financing Receivable, Revolving	5,428
Financing Receivable Revolving Loans Converted to Term Loan	2,147
Substandard [Member] | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	284
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	210
Financing Receivable, Revolving	74
Financing Receivable Revolving Loans Converted to Term Loan	0
Doubtful [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	119
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	119
Financing Receivable, Revolving	0
Financing Receivable Revolving Loans Converted to Term Loan	0
Doubtful [Member] | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	583
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	233
Financing Receivable, Revolving	343
Financing Receivable Revolving Loans Converted to Term Loan	193
Originated Loans | Bank Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	$ 610