Allowance For Credit Losses (Financing Receivable, Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,663,966	$ 3,618,825	$ 3,616,099
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	104,724
2019	72,849
2018	62,702
2017	32,876
2016	18,235
Prior	13,558
Revolving Loans, Amortized Cost Basis	79,036
Total	383,980		308,015
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	230,963
2019	342,713
2018	189,189
2017	163,382
2016	171,856
Prior	338,938
Revolving Loans, Amortized Cost Basis	27,660
Total	1,464,701		1,459,737
1-4 Family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	17,422
2019	19,789
2018	9,164
2017	8,530
2016	7,126
Prior	41,514
Revolving Loans, Amortized Cost Basis	10,526
Total	114,071
Hotels
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24,327
2019	110,813
2018	26,376
2017	49,470
2016	26,023
Prior	58,980
Revolving Loans, Amortized Cost Basis	0
Total	295,989
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	69,894
2019	58,595
2018	3,371
2017	21,086
2016	32,657
Prior	27,638
Revolving Loans, Amortized Cost Basis	1,153
Total	214,394
Non Residential Non-Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	100,991
2019	117,014
2018	119,789
2017	55,495
2016	81,313
Prior	143,653
Revolving Loans, Amortized Cost Basis	10,559
Total	628,814
Non Residential Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	18,329
2019	36,502
2018	30,489
2017	28,801
2016	24,737
Prior	67,153
Revolving Loans, Amortized Cost Basis	5,422
Total	211,433
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	323,949
2019	257,535
2018	197,698
2017	147,445
2016	114,456
Prior	460,372
Revolving Loans, Amortized Cost Basis	119,810
Total	1,621,265		1,640,396
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	323,949
2019	257,334
2018	197,654
2017	147,323
2016	114,310
Prior	458,828
Revolving Loans, Amortized Cost Basis	117,884
Total	1,617,282
Residential real estate | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	201
2018	44
2017	122
2016	146
Prior	1,544
Revolving Loans, Amortized Cost Basis	1,926
Total	3,983
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,765
2019	6,757
2018	6,363
2017	2,373
2016	1,828
Prior	11,233
Revolving Loans, Amortized Cost Basis	103,816
Total	140,135		148,928
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7,765
2019	6,757
2018	6,363
2017	2,373
2016	1,828
Prior	11,233
Revolving Loans, Amortized Cost Basis	103,742
Total	140,061
Home equity | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans, Amortized Cost Basis	74
Total	74
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13,561
2019	16,784
2018	10,371
2017	3,805
2016	2,055
Prior	2,106
Revolving Loans, Amortized Cost Basis	1,859
Total	50,541		54,263
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13,561
2019	16,784
2018	10,371
2017	3,805
2016	2,055
Prior	2,106
Revolving Loans, Amortized Cost Basis	1,859
Total	50,541
Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans, Amortized Cost Basis	0
Total	0
Noncommercial Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total			1,843,587
Commercial Industrial Loans And Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total			1,767,752
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total			1,685,491
Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	104,483
2019	71,222
2018	61,613
2017	32,056
2016	17,912
Prior	10,944
Revolving Loans, Amortized Cost Basis	76,538
Total	374,768		276,847
Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	229,396
2019	314,931
2018	183,421
2017	149,838
2016	161,976
Prior	304,069
Revolving Loans, Amortized Cost Basis	27,339
Total	1,370,970		1,408,644
Pass | 1-4 Family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	17,131
2019	19,426
2018	9,164
2017	7,563
2016	6,859
Prior	35,406
Revolving Loans, Amortized Cost Basis	10,526
Total	106,075
Pass | Hotels
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,983
2019	95,401
2018	26,376
2017	39,848
2016	21,521
Prior	44,727
Revolving Loans, Amortized Cost Basis	0
Total	251,856
Pass | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	69,894
2019	56,692
2018	2,815
2017	21,086
2016	32,657
Prior	27,559
Revolving Loans, Amortized Cost Basis	1,153
Total	211,856
Pass | Non Residential Non-Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	100,384
2019	115,117
2018	118,026
2017	55,387
2016	80,109
Prior	142,361
Revolving Loans, Amortized Cost Basis	10,399
Total	621,783
Pass | Non Residential Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	18,004
2019	28,295
2018	27,040
2017	25,954
2016	20,830
Prior	54,016
Revolving Loans, Amortized Cost Basis	5,261
Total	179,400
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total			16,310
Special mention | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	83
2019	43
2018	14
2017	60
2016	0
Prior	437
Revolving Loans, Amortized Cost Basis	414
Total	1,051		2,472
Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	396
2019	5,287
2018	1,209
2017	156
2016	185
Prior	3,643
Revolving Loans, Amortized Cost Basis	0
Total	10,876		13,838
Special mention | 1-4 Family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	171
2019	0
2018	0
2017	24
2016	162
Prior	957
Revolving Loans, Amortized Cost Basis	0
Total	1,314
Special mention | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1,903
2018	556
2017	0
2016	0
Prior	0
Revolving Loans, Amortized Cost Basis	0
Total	2,459
Special mention | Non Residential Non-Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	17
2019	511
2018	597
2017	43
2016	0
Prior	149
Revolving Loans, Amortized Cost Basis	0
Total	1,317
Special mention | Non Residential Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	208
2019	2,873
2018	56
2017	89
2016	23
Prior	2,537
Revolving Loans, Amortized Cost Basis	0
Total	5,786
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total			65,951
Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	158
2019	1,584
2018	1,075
2017	760
2016	323
Prior	2,177
Revolving Loans, Amortized Cost Basis	2,084
Total	8,161		28,696
Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,171
2019	22,495
2018	4,559
2017	13,388
2016	9,695
Prior	31,226
Revolving Loans, Amortized Cost Basis	321
Total	82,855		37,255
Substandard | 1-4 Family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	120
2019	363
2018	0
2017	943
2016	105
Prior	5,151
Revolving Loans, Amortized Cost Basis	0
Total	6,682
Substandard | Hotels
Financing Receivable, Credit Quality Indicator [Line Items]
2020	344
2019	15,412
2018	0
2017	9,622
2016	4,502
Prior	14,253
Revolving Loans, Amortized Cost Basis	0
Total	44,133
Substandard | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	79
Revolving Loans, Amortized Cost Basis	0
Total	79
Substandard | Non Residential Non-Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	590
2019	1,386
2018	1,166
2017	65
2016	1,204
Prior	1,143
Revolving Loans, Amortized Cost Basis	160
Total	5,714
Substandard | Non Residential Owner Occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	117
2019	5,334
2018	3,393
2017	2,758
2016	3,884
Prior	10,600
Revolving Loans, Amortized Cost Basis	161
Total	$ 26,247
Non-performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total			3,476
Non-performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total			531
Non-performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total			0
Non-performing | Noncommercial Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total			4,007
Performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total			1,636,920
Performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total			148,397
Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total			54,263
Performing | Noncommercial Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total			$ 1,839,580