Loans and Allowance for Credit Losses (Loan risk ratings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Credit quality categories
Prior	$ 1,088,954		$ 1,088,954
2019	280,670		280,670
2020	470,293		470,293
2021	854,131		854,131
2022	1,116,583		1,116,583
2023	589,324		589,324
Revolving Loans	212,330		212,330
Revolving Converted to Term Loans	5,434		5,434
Total	4,617,719		4,617,719		$ 2,556,107
Total gross charge-offs	(1,502)	$ (202)	(1,786)	$ (457)
Loans Evaluated By Performing Status
Credit quality categories
Prior	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	6,099		6,099
Revolving Converted to Term Loans	0		0
Total	6,099		6,099
Total gross charge-offs			(60)
Current period gross charge-offs
Gross charge-offs, prior			0
Gross charge-offs, 2019			0
Gross charge-offs, 2020			0
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			(60)
Revolving Converted to Term Loans			0
Total loans by risk category
Credit quality categories
Prior	1,088,954		1,088,954
2019	280,670		280,670
2020	470,293		470,293
2021	854,131		854,131
2022	1,116,583		1,116,583
2023	589,324		589,324
Revolving Loans	206,231		206,231
Revolving Converted to Term Loans	5,434		5,434
Total	4,611,620		4,611,620
Total gross charge-offs			(1,726)
Current period gross charge-offs
Gross charge-offs, prior			(558)
Gross charge-offs, 2019			0
Gross charge-offs, 2020			(830)
Gross charge-offs, 2021			(3)
Gross charge-offs, 2022			(1)
Gross charge-offs, 2023			(328)
Revolving Loans			(1)
Revolving Converted to Term Loans			(5)
Pass
Credit quality categories
Prior	1,067,888		1,067,888
2019	278,121		278,121
2020	470,293		470,293
2021	846,823		846,823
2022	1,112,007		1,112,007
2023	589,324		589,324
Revolving Loans	205,011		205,011
Revolving Converted to Term Loans	4,719		4,719
Total	4,574,186		4,574,186
Special Mention
Credit quality categories
Prior	14,109		14,109
2019	400		400
2020	0		0
2021	6,624		6,624
2022	4,475		4,475
2023	0		0
Revolving Loans	268		268
Revolving Converted to Term Loans	669		669
Total	26,545		26,545
Substandard
Credit quality categories
Prior	6,957		6,957
2019	2,149		2,149
2020	0		0
2021	684		684
2022	101		101
2023	0		0
Revolving Loans	952		952
Revolving Converted to Term Loans	46		46
Total	10,889		10,889
Construction
Credit quality categories
Prior	27,381		27,381
2019	14,732		14,732
2020	29,531		29,531
2021	40,505		40,505
2022	135,418		135,418
2023	72,852		72,852
Revolving Loans	8,331		8,331
Revolving Converted to Term Loans	0		0
Total	328,750		328,750
Total gross charge-offs			0
Current period gross charge-offs
Gross charge-offs, prior			0
Gross charge-offs, 2019			0
Gross charge-offs, 2020			0
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			0
Revolving Converted to Term Loans			0
Construction | Pass
Credit quality categories
Prior	27,243		27,243
2019	14,732		14,732
2020	29,531		29,531
2021	40,493		40,493
2022	135,418		135,418
2023	72,852		72,852
Revolving Loans	8,331		8,331
Revolving Converted to Term Loans	0		0
Total	328,600		328,600
Construction | Substandard
Credit quality categories
Prior	138		138
2019	0		0
2020	0		0
2021	12		12
2022	0		0
2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total	150		150
Residential real estate
Credit quality categories
Prior	335,544		335,544
2019	55,347		55,347
2020	107,259		107,259
2021	248,445		248,445
2022	355,912		355,912
2023	218,563		218,563
Revolving Loans	117,518		117,518
Revolving Converted to Term Loans	876		876
Total	1,439,464		1,439,464		810,497
Total gross charge-offs	0	0	0	(4)
Current period gross charge-offs
Gross charge-offs, prior			0
Gross charge-offs, 2019			0
Gross charge-offs, 2020			0
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			0
Revolving Converted to Term Loans			0
Residential real estate | Pass
Credit quality categories
Prior	330,183		330,183
2019	55,088		55,088
2020	107,259		107,259
2021	248,445		248,445
2022	355,912		355,912
2023	218,563		218,563
Revolving Loans	116,868		116,868
Revolving Converted to Term Loans	876		876
Total	1,433,194		1,433,194
Residential real estate | Special Mention
Credit quality categories
Prior	41		41
2019	259		259
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	192		192
Revolving Converted to Term Loans	0		0
Total	492		492
Residential real estate | Substandard
Credit quality categories
Prior	5,320		5,320
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	458		458
Revolving Converted to Term Loans	0		0
Total	5,778		5,778
Commercial real estate
Credit quality categories
Prior	699,413		699,413
2019	194,867		194,867
2020	302,597		302,597
2021	437,647		437,647
2022	434,689		434,689
2023	195,260		195,260
Revolving Loans	16,420		16,420
Revolving Converted to Term Loans	2,628		2,628
Total	2,283,521		2,283,521		1,065,409
Total gross charge-offs	(1,327)	0	(1,327)	(6)
Current period gross charge-offs
Gross charge-offs, prior			(513)
Gross charge-offs, 2019			0
Gross charge-offs, 2020			(814)
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			0
Revolving Converted to Term Loans			0
Commercial real estate | Pass
Credit quality categories
Prior	683,984		683,984
2019	192,789		192,789
2020	302,597		302,597
2021	430,908		430,908
2022	430,214		430,214
2023	195,260		195,260
Revolving Loans	16,420		16,420
Revolving Converted to Term Loans	2,202		2,202
Total	2,254,374		2,254,374
Commercial real estate | Special Mention
Credit quality categories
Prior	13,931		13,931
2019	141		141
2020	0		0
2021	6,184		6,184
2022	4,475		4,475
2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	426		426
Total	25,157		25,157
Commercial real estate | Substandard
Credit quality categories
Prior	1,498		1,498
2019	1,937		1,937
2020	0		0
2021	555		555
2022	0		0
2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total	3,990		3,990
Commercial
Credit quality categories
Prior	25,934		25,934
2019	14,440		14,440
2020	15,332		15,332
2021	43,649		43,649
2022	40,360		40,360
2023	24,582		24,582
Revolving Loans	63,247		63,247
Revolving Converted to Term Loans	1,930		1,930
Total	229,474		229,474		147,856
Total gross charge-offs	0	(202)	0	(416)
Current period gross charge-offs
Gross charge-offs, prior			0
Gross charge-offs, 2019			0
Gross charge-offs, 2020			0
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			0
Revolving Converted to Term Loans			0
Commercial | Pass
Credit quality categories
Prior	25,796		25,796
2019	14,254		14,254
2020	15,332		15,332
2021	43,209		43,209
2022	40,337		40,337
2023	24,582		24,582
Revolving Loans	62,679		62,679
Revolving Converted to Term Loans	1,641		1,641
Total	227,830		227,830
Commercial | Special Mention
Credit quality categories
Prior	137		137
2019	0		0
2020	0		0
2021	440		440
2022	0		0
2023	0		0
Revolving Loans	75		75
Revolving Converted to Term Loans	243		243
Total	895		895
Commercial | Substandard
Credit quality categories
Prior	1		1
2019	186		186
2020	0		0
2021	0		0
2022	23		23
2023	0		0
Revolving Loans	493		493
Revolving Converted to Term Loans	46		46
Total	749		749
Consumer
Credit quality categories
Prior	682		682
2019	1,284		1,284
2020	15,574		15,574
2021	83,885		83,885
2022	150,204		150,204
2023	78,067		78,067
Revolving Loans	715		715
Revolving Converted to Term Loans	0		0
Total	330,411		330,411		286,026
Total gross charge-offs	(115)	$ 0	(399)	$ (31)
Current period gross charge-offs
Gross charge-offs, prior			(45)
Gross charge-offs, 2019			0
Gross charge-offs, 2020			(16)
Gross charge-offs, 2021			(3)
Gross charge-offs, 2022			(1)
Gross charge-offs, 2023			(328)
Revolving Loans			(1)
Revolving Converted to Term Loans			(5)
Consumer | Pass
Credit quality categories
Prior	682		682
2019	1,258		1,258
2020	15,574		15,574
2021	83,768		83,768
2022	150,126		150,126
2023	78,067		78,067
Revolving Loans	713		713
Revolving Converted to Term Loans	0		0
Total	330,188		330,188
Consumer | Special Mention
Credit quality categories
Prior	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	1		1
Revolving Converted to Term Loans	0		0
Total	1		1
Consumer | Substandard
Credit quality categories
Prior	0		0
2019	26		26
2020	0		0
2021	117		117
2022	78		78
2023	0		0
Revolving Loans	1		1
Revolving Converted to Term Loans	0		0
Total	222		222
Credit Cards
Credit quality categories
Prior	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	6,099		6,099
Revolving Converted to Term Loans	0		0
Total	6,099		6,099		$ 0
Total gross charge-offs	(60)		(60)
Current period gross charge-offs
Gross charge-offs, prior			0
Gross charge-offs, 2019			0
Gross charge-offs, 2020			0
Gross charge-offs, 2021			0
Gross charge-offs, 2022			0
Gross charge-offs, 2023			0
Revolving Loans			(60)
Revolving Converted to Term Loans			0
Credit Cards | Performing
Credit quality categories
Prior	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	6,099		6,099
Revolving Converted to Term Loans	0		0
Total	6,099		6,099
Credit Cards | Non-Performing
Credit quality categories
Prior	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total	$ 0		$ 0