Loans (Credit Quality Indicators Vintage) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Term loans amortized cost, current fiscal year	$ 878,981	$ 1,616,371
Term loans amortized cost, one year before current fiscal year	1,551,627	1,189,746
Term loans amortized cost, two years before current fiscal year	1,144,330	532,413
Term loans amortized cost, three years before current fiscal year	478,623	407,075
Term loans amortized cost, four years before current fiscal year	372,009	341,778
Term loans amortized cost, five years or more before current fiscal year	831,226	675,484
Revolving loans amortized cost	375,764	335,300
Revolving loans converted to term loans	15,146	11,972
Total	5,647,706	5,110,139
Gross charge-offs, current year	196
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	373
Gross charge-offs, revolving loans	0
Gross charge-offs, revolving loans converted to term loans	0
Total gross charge-offs	577
Commercial Real Estate
Term loans amortized cost, current fiscal year	348,969	612,175
Term loans amortized cost, one year before current fiscal year	598,946	405,386
Term loans amortized cost, two years before current fiscal year	414,898	178,117
Term loans amortized cost, three years before current fiscal year	168,451	194,529
Term loans amortized cost, four years before current fiscal year	181,982	178,234
Term loans amortized cost, five years or more before current fiscal year	349,986	253,037
Revolving loans amortized cost	42,095	6,389
Revolving loans converted to term loans	1,032	1,437
Total	2,106,359	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	373
Gross charge-offs, revolving loans	0
Gross charge-offs, revolving loans converted to term loans	0
Total gross charge-offs	373
Commercial Real Estate | Pass
Term loans amortized cost, current fiscal year	327,139	591,596
Term loans amortized cost, one year before current fiscal year	598,946	383,062
Term loans amortized cost, two years before current fiscal year	396,468	177,286
Term loans amortized cost, three years before current fiscal year	168,451	170,259
Term loans amortized cost, four years before current fiscal year	167,484	148,371
Term loans amortized cost, five years or more before current fiscal year	333,356	242,061
Revolving loans amortized cost	42,095	6,243
Revolving loans converted to term loans	1,032	1,437
Total	2,034,971	1,720,315
Commercial Real Estate | Special Mention
Term loans amortized cost, current fiscal year	0	20,579
Term loans amortized cost, one year before current fiscal year	0	22,324
Term loans amortized cost, two years before current fiscal year	0	328
Term loans amortized cost, three years before current fiscal year	0	24,270
Term loans amortized cost, four years before current fiscal year	0	28,676
Term loans amortized cost, five years or more before current fiscal year	16,630	10,564
Revolving loans amortized cost	0	146
Revolving loans converted to term loans	0	0
Total	16,630	106,887
Commercial Real Estate | Classified
Term loans amortized cost, current fiscal year	21,830	0
Term loans amortized cost, one year before current fiscal year	0	0
Term loans amortized cost, two years before current fiscal year	18,430	503
Term loans amortized cost, three years before current fiscal year	0	0
Term loans amortized cost, four years before current fiscal year	14,498	1,187
Term loans amortized cost, five years or more before current fiscal year	0	412
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	54,758	2,102
Commercial & Industrial
Term loans amortized cost, current fiscal year	66,726	140,718
Term loans amortized cost, one year before current fiscal year	125,712	63,405
Term loans amortized cost, two years before current fiscal year	52,471	71,265
Term loans amortized cost, three years before current fiscal year	49,812	86,477
Term loans amortized cost, four years before current fiscal year	73,739	86,438
Term loans amortized cost, five years or more before current fiscal year	145,361	114,241
Revolving loans amortized cost	90,664	93,108
Revolving loans converted to term loans	587	745
Total	605,072	656,397
Gross charge-offs, current year	37
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	37
Commercial & Industrial | Pass
Term loans amortized cost, current fiscal year	55,607	127,152
Term loans amortized cost, one year before current fiscal year	124,894	63,180
Term loans amortized cost, two years before current fiscal year	52,282	71,265
Term loans amortized cost, three years before current fiscal year	49,812	86,470
Term loans amortized cost, four years before current fiscal year	72,876	85,011
Term loans amortized cost, five years or more before current fiscal year	145,361	114,241
Revolving loans amortized cost	90,664	90,987
Revolving loans converted to term loans	587	745
Total	592,083	639,051
Commercial & Industrial | Special Mention
Term loans amortized cost, current fiscal year	11,119	13,566
Term loans amortized cost, one year before current fiscal year	0	0
Term loans amortized cost, two years before current fiscal year	0	0
Term loans amortized cost, three years before current fiscal year	0	0
Term loans amortized cost, four years before current fiscal year	181	1,427
Term loans amortized cost, five years or more before current fiscal year	0	0
Revolving loans amortized cost	0	1,426
Revolving loans converted to term loans	0	0
Total	11,300	16,419
Commercial & Industrial | Classified
Term loans amortized cost, current fiscal year	0	0
Term loans amortized cost, one year before current fiscal year	818	225
Term loans amortized cost, two years before current fiscal year	189	0
Term loans amortized cost, three years before current fiscal year	0	7
Term loans amortized cost, four years before current fiscal year	682	0
Term loans amortized cost, five years or more before current fiscal year	0	0
Revolving loans amortized cost	0	695
Revolving loans converted to term loans	0	0
Total	1,689	927
Residential Real Estate [Member]
Term loans amortized cost, current fiscal year	431,563	838,566
Term loans amortized cost, one year before current fiscal year	808,442	708,360
Term loans amortized cost, two years before current fiscal year	666,447	277,613
Term loans amortized cost, three years before current fiscal year	256,440	123,364
Term loans amortized cost, four years before current fiscal year	114,056	74,856
Term loans amortized cost, five years or more before current fiscal year	327,530	300,243
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	2,604,478	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
Residential Real Estate [Member] | Current
Term loans amortized cost, current fiscal year	431,563	838,566
Term loans amortized cost, one year before current fiscal year	808,442	707,760
Term loans amortized cost, two years before current fiscal year	666,447	277,613
Term loans amortized cost, three years before current fiscal year	255,554	123,098
Term loans amortized cost, four years before current fiscal year	113,462	72,541
Term loans amortized cost, five years or more before current fiscal year	320,894	294,549
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	2,596,362	2,314,127
Residential Real Estate [Member] | Past Due
Term loans amortized cost, current fiscal year	0	0
Term loans amortized cost, one year before current fiscal year	0	600
Term loans amortized cost, two years before current fiscal year	0	0
Term loans amortized cost, three years before current fiscal year	886	266
Term loans amortized cost, four years before current fiscal year	594	2,315
Term loans amortized cost, five years or more before current fiscal year	6,636	5,694
Revolving loans amortized cost	0	0
Revolving loans converted to term loans	0	0
Total	8,116	8,875
Home Equity [Member]
Term loans amortized cost, current fiscal year	24,925	20,665
Term loans amortized cost, one year before current fiscal year	14,997	8,308
Term loans amortized cost, two years before current fiscal year	6,829	3,742
Term loans amortized cost, three years before current fiscal year	2,919	2,406
Term loans amortized cost, four years before current fiscal year	2,112	2,015
Term loans amortized cost, five years or more before current fiscal year	4,525	3,237
Revolving loans amortized cost	242,760	235,552
Revolving loans converted to term loans	13,527	9,790
Total	312,594	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
Home Equity [Member] | Current
Term loans amortized cost, current fiscal year	24,925	20,665
Term loans amortized cost, one year before current fiscal year	14,997	8,308
Term loans amortized cost, two years before current fiscal year	6,829	3,742
Term loans amortized cost, three years before current fiscal year	2,919	2,406
Term loans amortized cost, four years before current fiscal year	1,982	1,947
Term loans amortized cost, five years or more before current fiscal year	3,696	3,139
Revolving loans amortized cost	241,459	235,004
Revolving loans converted to term loans	12,591	9,268
Total	309,398	284,479
Home Equity [Member] | Past Due
Term loans amortized cost, current fiscal year	0	0
Term loans amortized cost, one year before current fiscal year	0	0
Term loans amortized cost, two years before current fiscal year	0	0
Term loans amortized cost, three years before current fiscal year	0	0
Term loans amortized cost, four years before current fiscal year	130	68
Term loans amortized cost, five years or more before current fiscal year	829	98
Revolving loans amortized cost	1,301	548
Revolving loans converted to term loans	936	522
Total	3,196	1,236
Other Consumer [Member]
Term loans amortized cost, current fiscal year	6,798	4,247
Term loans amortized cost, one year before current fiscal year	3,530	4,287
Term loans amortized cost, two years before current fiscal year	3,685	1,676
Term loans amortized cost, three years before current fiscal year	1,001	299
Term loans amortized cost, four years before current fiscal year	120	235
Term loans amortized cost, five years or more before current fiscal year	3,824	4,726
Revolving loans amortized cost	245	251
Revolving loans converted to term loans	0	0
Total	19,203	15,721
Gross charge-offs, current year	159
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	167
Other Consumer [Member] | Current
Term loans amortized cost, current fiscal year	6,777	4,231
Term loans amortized cost, one year before current fiscal year	3,530	4,287
Term loans amortized cost, two years before current fiscal year	3,685	1,676
Term loans amortized cost, three years before current fiscal year	1,001	299
Term loans amortized cost, four years before current fiscal year	120	235
Term loans amortized cost, five years or more before current fiscal year	3,824	4,726
Revolving loans amortized cost	243	251
Revolving loans converted to term loans	0	0
Total	19,180	15,705
Other Consumer [Member] | Past Due
Term loans amortized cost, current fiscal year	21	16
Term loans amortized cost, one year before current fiscal year	0	0
Term loans amortized cost, two years before current fiscal year	0	0
Term loans amortized cost, three years before current fiscal year	0	0
Term loans amortized cost, four years before current fiscal year	0	0
Term loans amortized cost, five years or more before current fiscal year	0	0
Revolving loans amortized cost	2	0
Revolving loans converted to term loans	0	0
Total	$ 23	$ 16