Loans (Credit Quality Indicators Vintage) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Term loans amortized cost, current fiscal year	$ 1,058,859
Term loans amortized cost, one year before current fiscal year	734,581
Term loans amortized cost, two years before current fiscal year	554,968
Term loans amortized cost, three years before current fiscal year	476,043
Term loans amortized cost, four years before current fiscal year	325,496
Term loans amortized cost, five years or more before current fiscal year	699,479
Revolving loans amortized cost	330,433
Revolving loans converted to term loans	16,131
Total	4,195,990
Commercial Real Estate [Member]
Term loans amortized cost, current fiscal year	285,054
Term loans amortized cost, one year before current fiscal year	374,110
Term loans amortized cost, two years before current fiscal year	300,304
Term loans amortized cost, three years before current fiscal year	252,532
Term loans amortized cost, four years before current fiscal year	147,808
Term loans amortized cost, five years or more before current fiscal year	259,726
Revolving loans amortized cost	11,104
Revolving loans converted to term loans	2,386
Total	1,633,024
Commercial Real Estate [Member] | Pass
Term loans amortized cost, current fiscal year	283,341
Term loans amortized cost, one year before current fiscal year	353,875
Term loans amortized cost, two years before current fiscal year	260,917
Term loans amortized cost, three years before current fiscal year	236,310
Term loans amortized cost, four years before current fiscal year	136,490
Term loans amortized cost, five years or more before current fiscal year	249,359
Revolving loans amortized cost	10,333
Revolving loans converted to term loans	2,386
Total	1,533,011
Commercial Real Estate [Member] | Special Mention
Term loans amortized cost, current fiscal year	756
Term loans amortized cost, one year before current fiscal year	20,235
Term loans amortized cost, two years before current fiscal year	39,387
Term loans amortized cost, three years before current fiscal year	16,222
Term loans amortized cost, four years before current fiscal year	11,318
Term loans amortized cost, five years or more before current fiscal year	10,367
Revolving loans amortized cost	771
Revolving loans converted to term loans	0
Total	99,056
Commercial Real Estate [Member] | Classified
Term loans amortized cost, current fiscal year	957
Term loans amortized cost, one year before current fiscal year	0
Term loans amortized cost, two years before current fiscal year	0
Term loans amortized cost, three years before current fiscal year	0
Term loans amortized cost, four years before current fiscal year	0
Term loans amortized cost, five years or more before current fiscal year	0
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	957
Commercial & Industrial [Member]
Term loans amortized cost, current fiscal year	295,019
Term loans amortized cost, one year before current fiscal year	96,497
Term loans amortized cost, two years before current fiscal year	101,356
Term loans amortized cost, three years before current fiscal year	63,631
Term loans amortized cost, four years before current fiscal year	47,586
Term loans amortized cost, five years or more before current fiscal year	112,344
Revolving loans amortized cost	99,623
Revolving loans converted to term loans	1,352
Total	817,408
Commercial & Industrial [Member] | Pass
Term loans amortized cost, current fiscal year	293,493
Term loans amortized cost, one year before current fiscal year	95,775
Term loans amortized cost, two years before current fiscal year	98,146
Term loans amortized cost, three years before current fiscal year	56,792
Term loans amortized cost, four years before current fiscal year	44,445
Term loans amortized cost, five years or more before current fiscal year	91,128
Revolving loans amortized cost	95,817
Revolving loans converted to term loans	1,296
Total	776,892
Commercial & Industrial [Member] | Special Mention
Term loans amortized cost, current fiscal year	1,123
Term loans amortized cost, one year before current fiscal year	722
Term loans amortized cost, two years before current fiscal year	3,210
Term loans amortized cost, three years before current fiscal year	6,839
Term loans amortized cost, four years before current fiscal year	3,141
Term loans amortized cost, five years or more before current fiscal year	14,853
Revolving loans amortized cost	3,806
Revolving loans converted to term loans	56
Total	33,750
Commercial & Industrial [Member] | Classified
Term loans amortized cost, current fiscal year	403
Term loans amortized cost, one year before current fiscal year	0
Term loans amortized cost, two years before current fiscal year	0
Term loans amortized cost, three years before current fiscal year	0
Term loans amortized cost, four years before current fiscal year	0
Term loans amortized cost, five years or more before current fiscal year	6,363
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	6,766
Residential Real Estate [Member]
Term loans amortized cost, current fiscal year	463,715
Term loans amortized cost, one year before current fiscal year	254,926
Term loans amortized cost, two years before current fiscal year	148,149
Term loans amortized cost, three years before current fiscal year	156,862
Term loans amortized cost, four years before current fiscal year	128,249
Term loans amortized cost, five years or more before current fiscal year	315,411
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	1,467,312
Residential Real Estate [Member] | Current
Term loans amortized cost, current fiscal year	463,477
Term loans amortized cost, one year before current fiscal year	253,228
Term loans amortized cost, two years before current fiscal year	146,839
Term loans amortized cost, three years before current fiscal year	155,976
Term loans amortized cost, four years before current fiscal year	128,139
Term loans amortized cost, five years or more before current fiscal year	309,314
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	1,456,973
Residential Real Estate [Member] | Past Due
Term loans amortized cost, current fiscal year	238
Term loans amortized cost, one year before current fiscal year	1,698
Term loans amortized cost, two years before current fiscal year	1,310
Term loans amortized cost, three years before current fiscal year	886
Term loans amortized cost, four years before current fiscal year	110
Term loans amortized cost, five years or more before current fiscal year	6,097
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	10,339
Home Equity [Member]
Term loans amortized cost, current fiscal year	9,838
Term loans amortized cost, one year before current fiscal year	6,806
Term loans amortized cost, two years before current fiscal year	3,922
Term loans amortized cost, three years before current fiscal year	1,474
Term loans amortized cost, four years before current fiscal year	1,217
Term loans amortized cost, five years or more before current fiscal year	4,141
Revolving loans amortized cost	219,395
Revolving loans converted to term loans	12,392
Total	259,185
Home Equity [Member] | Current
Term loans amortized cost, current fiscal year	9,838
Term loans amortized cost, one year before current fiscal year	6,771
Term loans amortized cost, two years before current fiscal year	3,898
Term loans amortized cost, three years before current fiscal year	1,474
Term loans amortized cost, four years before current fiscal year	1,217
Term loans amortized cost, five years or more before current fiscal year	3,955
Revolving loans amortized cost	219,085
Revolving loans converted to term loans	11,280
Total	257,518
Home Equity [Member] | Past Due
Term loans amortized cost, current fiscal year	0
Term loans amortized cost, one year before current fiscal year	35
Term loans amortized cost, two years before current fiscal year	24
Term loans amortized cost, three years before current fiscal year	0
Term loans amortized cost, four years before current fiscal year	0
Term loans amortized cost, five years or more before current fiscal year	186
Revolving loans amortized cost	310
Revolving loans converted to term loans	1,112
Total	1,667
Other Consumer [Member]
Term loans amortized cost, current fiscal year	5,233
Term loans amortized cost, one year before current fiscal year	2,242
Term loans amortized cost, two years before current fiscal year	1,237
Term loans amortized cost, three years before current fiscal year	1,544
Term loans amortized cost, four years before current fiscal year	636
Term loans amortized cost, five years or more before current fiscal year	7,857
Revolving loans amortized cost	311
Revolving loans converted to term loans	1
Total	19,061
Other Consumer [Member] | Current
Term loans amortized cost, current fiscal year	5,214
Term loans amortized cost, one year before current fiscal year	2,241
Term loans amortized cost, two years before current fiscal year	1,237
Term loans amortized cost, three years before current fiscal year	1,544
Term loans amortized cost, four years before current fiscal year	548
Term loans amortized cost, five years or more before current fiscal year	7,850
Revolving loans amortized cost	308
Revolving loans converted to term loans	1
Total	18,943
Other Consumer [Member] | Past Due
Term loans amortized cost, current fiscal year	19
Term loans amortized cost, one year before current fiscal year	1
Term loans amortized cost, two years before current fiscal year	0
Term loans amortized cost, three years before current fiscal year	0
Term loans amortized cost, four years before current fiscal year	88
Term loans amortized cost, five years or more before current fiscal year	7
Revolving loans amortized cost	3
Revolving loans converted to term loans	0
Total	$ 118