Loans (Credit Quality Indicators Vintage) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		$ 226,361		$ 1,616,371
Term loans amortized cost, prior year		1,536,710		1,189,746
Term loans amortized cost, two years ago		1,189,199		532,413
Term loans amortized cost, three years ago		525,439		407,075
Term loans amortized cost, four years ago		405,227		341,778
Term loans amortized cost, five years ago or more		995,689		675,484
Revolving loans amortized cost		336,338		335,300
Revolving loans converted to term loans		13,006		11,972
Total		5,227,969		5,110,139
Gross charge-offs, current year		53
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		8
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		61	$ 36
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		94,852		612,175
Term loans amortized cost, prior year		556,396		405,386
Term loans amortized cost, two years ago		416,307		178,117
Term loans amortized cost, three years ago		180,270		194,529
Term loans amortized cost, four years ago		196,701		178,234
Term loans amortized cost, five years ago or more		454,423		253,037
Revolving loans amortized cost		9,033		6,389
Revolving loans converted to term loans		1,154		1,437
Total		1,909,136		1,829,304
Gross charge-offs, current year		0
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		0
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		0	0
Commercial Real Estate | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		74,365		591,596
Term loans amortized cost, prior year		556,396		383,062
Term loans amortized cost, two years ago		394,005		177,286
Term loans amortized cost, three years ago		179,602		170,259
Term loans amortized cost, four years ago		168,940		148,371
Term loans amortized cost, five years ago or more		413,854		242,061
Revolving loans amortized cost		8,931		6,243
Revolving loans converted to term loans		1,154		1,437
Total		1,797,247		1,720,315
Commercial Real Estate | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		20,487		20,579
Term loans amortized cost, prior year		0		22,324
Term loans amortized cost, two years ago		22,302		328
Term loans amortized cost, three years ago		668		24,270
Term loans amortized cost, four years ago		27,761		28,676
Term loans amortized cost, five years ago or more		38,968		10,564
Revolving loans amortized cost		102		146
Revolving loans converted to term loans		0		0
Total		110,288		106,887
Commercial Real Estate | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		0		0
Term loans amortized cost, prior year		0		0
Term loans amortized cost, two years ago		0		503
Term loans amortized cost, three years ago		0		0
Term loans amortized cost, four years ago		0		1,187
Term loans amortized cost, five years ago or more		1,601		412
Revolving loans amortized cost		0		0
Revolving loans converted to term loans		0		0
Total		1,601		2,102
Commercial & Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		15,645		140,718
Term loans amortized cost, prior year		121,057		63,405
Term loans amortized cost, two years ago		59,380		71,265
Term loans amortized cost, three years ago		67,621		86,477
Term loans amortized cost, four years ago		83,688		86,438
Term loans amortized cost, five years ago or more		168,863		114,241
Revolving loans amortized cost		92,487		93,108
Revolving loans converted to term loans		979		745
Total		609,720		656,397
Gross charge-offs, current year	[1]	11
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		0
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		11	5
Commercial & Industrial | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		4,116		127,152
Term loans amortized cost, prior year		120,221		63,180
Term loans amortized cost, two years ago		59,156		71,265
Term loans amortized cost, three years ago		67,621		86,470
Term loans amortized cost, four years ago		82,807		85,011
Term loans amortized cost, five years ago or more		167,451		114,241
Revolving loans amortized cost		91,060		90,987
Revolving loans converted to term loans		979		745
Total		593,411		639,051
Commercial & Industrial | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		11,529		13,566
Term loans amortized cost, prior year		836		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		185		1,427
Term loans amortized cost, five years ago or more		1,412		0
Revolving loans amortized cost		1,427		1,426
Revolving loans converted to term loans		0		0
Total		15,389		16,419
Commercial & Industrial | Classified [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		0		0
Term loans amortized cost, prior year		0		225
Term loans amortized cost, two years ago		224		0
Term loans amortized cost, three years ago		0		7
Term loans amortized cost, four years ago		696		0
Term loans amortized cost, five years ago or more		0		0
Revolving loans amortized cost		0		695
Revolving loans converted to term loans		0		0
Total		920		927
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		108,758		838,566
Term loans amortized cost, prior year		836,112		708,360
Term loans amortized cost, two years ago		701,315		277,613
Term loans amortized cost, three years ago		272,536		123,364
Term loans amortized cost, four years ago		122,302		74,856
Term loans amortized cost, five years ago or more		362,232		300,243
Revolving loans amortized cost		0		0
Revolving loans converted to term loans		0		0
Total		2,403,255		2,323,002
Gross charge-offs, current year		0
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		0
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		0	0
Residential Real Estate | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		108,758		838,566
Term loans amortized cost, prior year		836,112		707,760
Term loans amortized cost, two years ago		700,923		277,613
Term loans amortized cost, three years ago		272,006		123,098
Term loans amortized cost, four years ago		120,896		72,541
Term loans amortized cost, five years ago or more		358,830		294,549
Revolving loans amortized cost		0		0
Revolving loans converted to term loans		0		0
Total		2,397,525		2,314,127
Residential Real Estate | 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		600
Term loans amortized cost, two years ago		392		0
Term loans amortized cost, three years ago		530		266
Term loans amortized cost, four years ago		1,406		2,315
Term loans amortized cost, five years ago or more		3,402		5,694
Revolving loans amortized cost		0		0
Revolving loans converted to term loans		0		0
Total		5,730		8,875
Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		5,140		20,665
Term loans amortized cost, prior year		18,965		8,308
Term loans amortized cost, two years ago		7,993		3,742
Term loans amortized cost, three years ago		3,585		2,406
Term loans amortized cost, four years ago		2,319		2,015
Term loans amortized cost, five years ago or more		5,407		3,237
Revolving loans amortized cost		234,596		235,552
Revolving loans converted to term loans		10,873		9,790
Total		288,878		285,715
Gross charge-offs, current year		0
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		0
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		0	0
Home Equity | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		5,140		20,665
Term loans amortized cost, prior year		18,965		8,308
Term loans amortized cost, two years ago		7,993		3,742
Term loans amortized cost, three years ago		3,585		2,406
Term loans amortized cost, four years ago		2,319		1,947
Term loans amortized cost, five years ago or more		5,344		3,139
Revolving loans amortized cost		234,279		235,004
Revolving loans converted to term loans		10,420		9,268
Total		288,045		284,479
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		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		68
Term loans amortized cost, five years ago or more		63		98
Revolving loans amortized cost		317		548
Revolving loans converted to term loans		453		522
Total		833		1,236
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		1,966		4,247
Term loans amortized cost, prior year		4,180		4,287
Term loans amortized cost, two years ago		4,204		1,676
Term loans amortized cost, three years ago		1,427		299
Term loans amortized cost, four years ago		217		235
Term loans amortized cost, five years ago or more		4,764		4,726
Revolving loans amortized cost		222		251
Revolving loans converted to term loans		0		0
Total		16,980		15,721
Gross charge-offs, current year	[1]	42
Gross charge-offs, prior year		0
Gross charge-offs, two years ago		8
Gross charge-offs, three years ago		0
Gross charge-offs, four years ago		0
Gross charge-offs, five years ago or more		0
Gross charge-offs, revolving loans		0
Gross charge-offs, revolving loans converted to term loans		0
Total gross charge-offs		50	$ 31
Other | Current [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		1,951		4,231
Term loans amortized cost, prior year		4,180		4,287
Term loans amortized cost, two years ago		4,204		1,676
Term loans amortized cost, three years ago		1,427		299
Term loans amortized cost, four years ago		217		235
Term loans amortized cost, five years ago or more		4,764		4,726
Revolving loans amortized cost		222		251
Revolving loans converted to term loans		0		0
Total		16,965		15,705
Other | Past Due [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost, current year		15		16
Term loans amortized cost, prior year		0		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		$ 15		$ 16

[1] Gross charge-offs in 2023 represent charge-offs of business and consumer account overdraft balances.