Loans (Credit Quality Indicators Vintage) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	$ 727,179	$ 1,058,859
Term loans amortized cost, prior year	818,741	734,581
Term loans amortized cost, two years ago	673,776	554,968
Term loans amortized cost, three years ago	472,721	476,043
Term loans amortized cost, four years ago	399,911	325,496
Term loans amortized cost, five years ago or more	865,406	699,479
Revolving loans amortized cost	328,531	330,433
Revolving loans converted to term loans	13,535	16,131
Total	4,299,800	4,195,990
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	192,108	285,054
Term loans amortized cost, prior year	258,447	374,110
Term loans amortized cost, two years ago	359,854	300,304
Term loans amortized cost, three years ago	253,258	252,532
Term loans amortized cost, four years ago	224,449	147,808
Term loans amortized cost, five years ago or more	371,593	259,726
Revolving loans amortized cost	7,581	11,104
Revolving loans converted to term loans	2,334	2,386
Total	1,669,624	1,633,024
Commercial Real Estate | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	186,095	283,341
Term loans amortized cost, prior year	256,609	353,875
Term loans amortized cost, two years ago	330,127	260,917
Term loans amortized cost, three years ago	214,239	236,310
Term loans amortized cost, four years ago	208,316	136,490
Term loans amortized cost, five years ago or more	348,282	249,359
Revolving loans amortized cost	7,173	10,333
Revolving loans converted to term loans	2,334	2,386
Total	1,553,175	1,533,011
Commercial Real Estate | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	6,013	756
Term loans amortized cost, prior year	880	20,235
Term loans amortized cost, two years ago	29,727	39,387
Term loans amortized cost, three years ago	39,019	16,222
Term loans amortized cost, four years ago	16,133	11,318
Term loans amortized cost, five years ago or more	23,311	10,367
Revolving loans amortized cost	408	771
Revolving loans converted to term loans	0	0
Total	115,491	99,056
Commercial Real Estate | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0	957
Term loans amortized cost, prior year	958	0
Term loans amortized cost, two years ago	0	0
Term loans amortized cost, three years ago	0	0
Term loans amortized cost, four years ago	0	0
Term loans amortized cost, five years ago or more	0	0
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	958	957
Commercial & Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	137,678	295,019
Term loans amortized cost, prior year	134,293	96,497
Term loans amortized cost, two years ago	109,346	101,356
Term loans amortized cost, three years ago	97,039	63,631
Term loans amortized cost, four years ago	60,080	47,586
Term loans amortized cost, five years ago or more	121,025	112,344
Revolving loans amortized cost	103,919	99,623
Revolving loans converted to term loans	1,129	1,352
Total	764,509	817,408
Commercial & Industrial | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	137,678	293,493
Term loans amortized cost, prior year	133,756	95,775
Term loans amortized cost, two years ago	108,668	98,146
Term loans amortized cost, three years ago	92,357	56,792
Term loans amortized cost, four years ago	53,552	44,445
Term loans amortized cost, five years ago or more	104,976	91,128
Revolving loans amortized cost	102,733	95,817
Revolving loans converted to term loans	1,127	1,296
Total	734,847	776,892
Commercial & Industrial | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0	1,123
Term loans amortized cost, prior year	0	722
Term loans amortized cost, two years ago	678	3,210
Term loans amortized cost, three years ago	4,682	6,839
Term loans amortized cost, four years ago	6,528	3,141
Term loans amortized cost, five years ago or more	13,257	14,853
Revolving loans amortized cost	1,186	3,806
Revolving loans converted to term loans	0	56
Total	26,331	33,750
Commercial & Industrial | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0	403
Term loans amortized cost, prior year	537	0
Term loans amortized cost, two years ago	0	0
Term loans amortized cost, three years ago	0	0
Term loans amortized cost, four years ago	0	0
Term loans amortized cost, five years ago or more	2,792	6,363
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	2	0
Total	3,331	6,766
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	386,456	463,715
Term loans amortized cost, prior year	413,185	254,926
Term loans amortized cost, two years ago	197,802	148,149
Term loans amortized cost, three years ago	118,285	156,862
Term loans amortized cost, four years ago	113,251	128,249
Term loans amortized cost, five years ago or more	361,410	315,411
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	1,590,389	1,467,312
Residential Real Estate | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	386,456	463,477
Term loans amortized cost, prior year	412,948	253,228
Term loans amortized cost, two years ago	196,129	146,839
Term loans amortized cost, three years ago	117,079	155,976
Term loans amortized cost, four years ago	112,458	128,139
Term loans amortized cost, five years ago or more	358,663	309,314
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	1,583,733	1,456,973
Residential Real Estate | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0	238
Term loans amortized cost, prior year	237	1,698
Term loans amortized cost, two years ago	1,673	1,310
Term loans amortized cost, three years ago	1,206	886
Term loans amortized cost, four years ago	793	110
Term loans amortized cost, five years ago or more	2,747	6,097
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	6,656	10,339
Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	6,059	9,838
Term loans amortized cost, prior year	7,919	6,806
Term loans amortized cost, two years ago	5,261	3,922
Term loans amortized cost, three years ago	3,070	1,474
Term loans amortized cost, four years ago	1,260	1,217
Term loans amortized cost, five years ago or more	4,391	4,141
Revolving loans amortized cost	216,770	219,395
Revolving loans converted to term loans	10,072	12,392
Total	254,802	259,185
Home Equity | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	6,059	9,838
Term loans amortized cost, prior year	7,919	6,771
Term loans amortized cost, two years ago	5,261	3,898
Term loans amortized cost, three years ago	3,041	1,474
Term loans amortized cost, four years ago	1,260	1,217
Term loans amortized cost, five years ago or more	4,258	3,955
Revolving loans amortized cost	216,565	219,085
Revolving loans converted to term loans	9,208	11,280
Total	253,571	257,518
Home Equity | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0	0
Term loans amortized cost, prior year	0	35
Term loans amortized cost, two years ago	0	24
Term loans amortized cost, three years ago	29	0
Term loans amortized cost, four years ago	0	0
Term loans amortized cost, five years ago or more	133	186
Revolving loans amortized cost	205	310
Revolving loans converted to term loans	864	1,112
Total	1,231	1,667
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	4,878	5,233
Term loans amortized cost, prior year	4,897	2,242
Term loans amortized cost, two years ago	1,513	1,237
Term loans amortized cost, three years ago	1,069	1,544
Term loans amortized cost, four years ago	871	636
Term loans amortized cost, five years ago or more	6,987	7,857
Revolving loans amortized cost	261	311
Revolving loans converted to term loans	0	1
Total	20,476	19,061
Other | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	4,865	5,214
Term loans amortized cost, prior year	4,887	2,241
Term loans amortized cost, two years ago	1,508	1,237
Term loans amortized cost, three years ago	1,069	1,544
Term loans amortized cost, four years ago	871	548
Term loans amortized cost, five years ago or more	6,987	7,850
Revolving loans amortized cost	261	308
Revolving loans converted to term loans	0	1
Total	20,448	18,943
Other | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	13	19
Term loans amortized cost, prior year	10	1
Term loans amortized cost, two years ago	5	0
Term loans amortized cost, three years ago	0	0
Term loans amortized cost, four years ago	0	88
Term loans amortized cost, five years ago or more	0	7
Revolving loans amortized cost	0	3
Revolving loans converted to term loans	0	0
Total	$ 28	$ 118