Loans (Credit Quality Indicators Vintage) (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	$ 727,908
Term loans amortized cost, prior year	814,040
Term loans amortized cost, two years ago	636,607
Term loans amortized cost, three years ago	532,918
Term loans amortized cost, four years ago	381,767
Term loans amortized cost, five years ago or more	825,427
Revolving loans amortized cost	351,806
Revolving loans converted to term loans	17,168
Total	4,287,641
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	204,928
Term loans amortized cost, prior year	376,942
Term loans amortized cost, two years ago	338,798
Term loans amortized cost, three years ago	258,672
Term loans amortized cost, four years ago	150,315
Term loans amortized cost, five years ago or more	287,004
Revolving loans amortized cost	11,917
Revolving loans converted to term loans	2,422
Total	1,630,998
Commercial Real Estate | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	204,928
Term loans amortized cost, prior year	376,942
Term loans amortized cost, two years ago	338,798
Term loans amortized cost, three years ago	249,371
Term loans amortized cost, four years ago	150,315
Term loans amortized cost, five years ago or more	285,727
Revolving loans amortized cost	11,917
Revolving loans converted to term loans	2,422
Total	1,620,420
Commercial Real Estate | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	9,301
Term loans amortized cost, four years ago	0
Term loans amortized cost, five years ago or more	846
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	10,147
Commercial Real Estate | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	0
Term loans amortized cost, four years ago	0
Term loans amortized cost, five years ago or more	431
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	431
Commercial & Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	286,915
Term loans amortized cost, prior year	103,671
Term loans amortized cost, two years ago	84,136
Term loans amortized cost, three years ago	66,276
Term loans amortized cost, four years ago	68,551
Term loans amortized cost, five years ago or more	136,771
Revolving loans amortized cost	104,595
Revolving loans converted to term loans	1,530
Total	852,445
Commercial & Industrial | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	286,230
Term loans amortized cost, prior year	103,671
Term loans amortized cost, two years ago	84,136
Term loans amortized cost, three years ago	63,842
Term loans amortized cost, four years ago	68,551
Term loans amortized cost, five years ago or more	112,282
Revolving loans amortized cost	100,844
Revolving loans converted to term loans	1,462
Total	821,018
Commercial & Industrial | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	271
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	2,434
Term loans amortized cost, four years ago	0
Term loans amortized cost, five years ago or more	16,897
Revolving loans amortized cost	1,630
Revolving loans converted to term loans	68
Total	21,300
Commercial & Industrial | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	414
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	0
Term loans amortized cost, four years ago	0
Term loans amortized cost, five years ago or more	7,592
Revolving loans amortized cost	2,121
Revolving loans converted to term loans	0
Total	10,127
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	227,967
Term loans amortized cost, prior year	322,191
Term loans amortized cost, two years ago	206,627
Term loans amortized cost, three years ago	203,562
Term loans amortized cost, four years ago	160,697
Term loans amortized cost, five years ago or more	387,179
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	1,508,223
Residential Real Estate | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	227,967
Term loans amortized cost, prior year	321,681
Term loans amortized cost, two years ago	205,996
Term loans amortized cost, three years ago	201,423
Term loans amortized cost, four years ago	160,586
Term loans amortized cost, five years ago or more	378,071
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	1,495,724
Residential Real Estate | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0
Term loans amortized cost, prior year	510
Term loans amortized cost, two years ago	631
Term loans amortized cost, three years ago	2,139
Term loans amortized cost, four years ago	111
Term loans amortized cost, five years ago or more	9,108
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	12,499
Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	6,958
Term loans amortized cost, prior year	8,591
Term loans amortized cost, two years ago	5,204
Term loans amortized cost, three years ago	2,284
Term loans amortized cost, four years ago	1,375
Term loans amortized cost, five years ago or more	5,039
Revolving loans amortized cost	234,967
Revolving loans converted to term loans	13,214
Total	277,632
Home Equity | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	6,958
Term loans amortized cost, prior year	8,591
Term loans amortized cost, two years ago	5,204
Term loans amortized cost, three years ago	2,108
Term loans amortized cost, four years ago	1,375
Term loans amortized cost, five years ago or more	5,026
Revolving loans amortized cost	234,470
Revolving loans converted to term loans	12,267
Total	275,999
Home Equity | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	0
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	176
Term loans amortized cost, four years ago	0
Term loans amortized cost, five years ago or more	13
Revolving loans amortized cost	497
Revolving loans converted to term loans	947
Total	1,633
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	1,140
Term loans amortized cost, prior year	2,645
Term loans amortized cost, two years ago	1,842
Term loans amortized cost, three years ago	2,124
Term loans amortized cost, four years ago	829
Term loans amortized cost, five years ago or more	9,434
Revolving loans amortized cost	327
Revolving loans converted to term loans	2
Total	18,343
Other | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	1,132
Term loans amortized cost, prior year	2,645
Term loans amortized cost, two years ago	1,842
Term loans amortized cost, three years ago	2,113
Term loans amortized cost, four years ago	742
Term loans amortized cost, five years ago or more	9,434
Revolving loans amortized cost	327
Revolving loans converted to term loans	2
Total	18,237
Other | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year	8
Term loans amortized cost, prior year	0
Term loans amortized cost, two years ago	0
Term loans amortized cost, three years ago	11
Term loans amortized cost, four years ago	87
Term loans amortized cost, five years ago or more	0
Revolving loans amortized cost	0
Revolving loans converted to term loans	0
Total	$ 106