Loans and Allowance for Credit Losses (Loan Risk Ratings) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Credit quality categories
Prior	$ 1,309,202		$ 1,059,173
2020 & 2019	451,553		277,491
2021 & 2020	827,943		461,213
2022 & 2021	1,095,619		837,657
2023 & 2022	676,061		1,107,579
2024 & 2023	87,006		670,765
Revolving Loans	187,380		201,381
Revolving Converted to Term Loans	13,961		25,751
Total	4,648,725		4,641,010
Current period gross charge-offs
Total gross charge-offs	(654)	$ (107)
Loans Evaluated By Performing Status
Credit quality categories
Prior	0		0
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	6,921		6,583
Revolving Converted to Term Loans	0		0
Total	6,921		6,583
Current period gross charge-offs
Gross charge-offs, prior	0		0
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	0		0
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	(116)		(111)
Revolving Converted to Term Loans	0		0
Total gross charge-offs	(116)		(111)
Total loans by risk category
Credit quality categories
Prior	1,309,202		1,059,173
2020 & 2019	451,553		277,491
2021 & 2020	827,943		461,213
2022 & 2021	1,095,619		837,657
2023 & 2022	676,061		1,107,579
2024 & 2023	87,006		670,765
Revolving Loans	180,459		194,798
Revolving Converted to Term Loans	13,961		25,751
Total	4,641,804		4,634,427
Current period gross charge-offs
Gross charge-offs, prior	(227)		(1,035)
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	(58)		(830)
Gross charge-offs, 2022 & 2021	(238)		(17)
Gross charge-offs, 2023 & 2022	0		(8)
Gross charge-offs, 2024 & 2023	(15)		(4)
Revolving Loans	0		(126)
Revolving Converted to Term Loans	0		(242)
Total gross charge-offs	(538)		(2,262)
Pass
Credit quality categories
Prior	1,287,450		1,035,412
2020 & 2019	450,994		274,768
2021 & 2020	821,430		460,644
2022 & 2021	1,088,489		830,594
2023 & 2022	674,056		1,101,448
2024 & 2023	87,006		670,765
Revolving Loans	177,893		192,565
Revolving Converted to Term Loans	13,891		25,296
Total	4,601,209		4,591,492
Special Mention
Credit quality categories
Prior	11,921		15,283
2020 & 2019	552		587
2021 & 2020	5,972		564
2022 & 2021	5,932		6,429
2023 & 2022	1,897		4,446
2024 & 2023	0		0
Revolving Loans	848		545
Revolving Converted to Term Loans	70		409
Total	27,192		28,263
Substandard
Credit quality categories
Prior	9,831		8,478
2020 & 2019	7		2,136
2021 & 2020	541		5
2022 & 2021	1,198		634
2023 & 2022	108		1,685
2024 & 2023	0		0
Revolving Loans	1,718		1,688
Revolving Converted to Term Loans	0		46
Total	13,403		14,672
Construction
Credit quality categories
Prior	38,187		23,649
2020 & 2019	14,343		15,721
2021 & 2020	25,261		14,773
2022 & 2021	88,208		34,337
2023 & 2022	112,241		101,844
2024 & 2023	12,386		100,620
Revolving Loans	7,890		8,056
Revolving Converted to Term Loans	617		0
Total	299,133		299,000
Current period gross charge-offs
Gross charge-offs, prior	0		0
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	(12)		0
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total gross charge-offs	(12)	0	0
Construction | Pass
Credit quality categories
Prior	38,125		23,450
2020 & 2019	14,343		15,721
2021 & 2020	25,261		14,773
2022 & 2021	87,793		34,325
2023 & 2022	112,241		101,426
2024 & 2023	12,386		100,620
Revolving Loans	7,890		8,056
Revolving Converted to Term Loans	617		0
Total	298,656		298,371
Construction | Substandard
Credit quality categories
Prior	62		199
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	415		12
2023 & 2022	0		418
2024 & 2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total	477		629
Residential real estate
Credit quality categories
Prior	377,177		323,682
2020 & 2019	103,384		54,643
2021 & 2020	251,330		105,833
2022 & 2021	400,047		251,772
2023 & 2022	238,040		392,378
2024 & 2023	23,294		239,914
Revolving Loans	108,982		121,342
Revolving Converted to Term Loans	12,880		874
Total	1,515,134		1,490,438
Current period gross charge-offs
Gross charge-offs, prior	(1)		0
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	0		0
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	0		(119)
Revolving Converted to Term Loans	0		0
Total gross charge-offs	(1)	0	(119)
Residential real estate | Pass
Credit quality categories
Prior	370,852		317,528
2020 & 2019	102,832		54,387
2021 & 2020	250,832		105,269
2022 & 2021	400,047		251,269
2023 & 2022	238,040		392,378
2024 & 2023	23,294		239,914
Revolving Loans	107,384		119,777
Revolving Converted to Term Loans	12,880		874
Total	1,506,161		1,481,396
Residential real estate | Special Mention
Credit quality categories
Prior	403		154
2020 & 2019	552		256
2021 & 2020	498		564
2022 & 2021	0		503
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	182		192
Revolving Converted to Term Loans	0		0
Total	1,635		1,669
Residential real estate | Substandard
Credit quality categories
Prior	5,922		6,000
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	1,416		1,373
Revolving Converted to Term Loans	0		0
Total	7,338		7,373
Commercial real estate
Credit quality categories
Prior	858,367		687,147
2020 & 2019	306,361		193,113
2021 & 2020	424,346		311,980
2022 & 2021	433,281		432,793
2023 & 2022	211,540		432,686
2024 & 2023	23,024		210,915
Revolving Loans	15,948		14,973
Revolving Converted to Term Loans	0		2,547
Total	2,272,867		2,286,154
Current period gross charge-offs
Gross charge-offs, prior	0		(512)
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	0		(814)
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total gross charge-offs	0	0	(1,326)
Commercial real estate | Pass
Credit quality categories
Prior	843,547		670,042
2020 & 2019	306,361		190,753
2021 & 2020	418,343		311,980
2022 & 2021	428,863		426,750
2023 & 2022	211,540		428,240
2024 & 2023	23,024		210,915
Revolving Loans	15,782		14,873
Revolving Converted to Term Loans	0		2,138
Total	2,247,460		2,255,691
Commercial real estate | Special Mention
Credit quality categories
Prior	11,383		14,986
2020 & 2019	0		331
2021 & 2020	5,474		0
2022 & 2021	4,418		5,501
2023 & 2022	0		4,446
2024 & 2023	0		0
Revolving Loans	166		100
Revolving Converted to Term Loans	0		409
Total	21,441		25,773
Commercial real estate | Substandard
Credit quality categories
Prior	3,437		2,119
2020 & 2019	0		2,029
2021 & 2020	529		0
2022 & 2021	0		542
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		0
Total	3,966		4,690
Commercial
Credit quality categories
Prior	34,108		24,074
2020 & 2019	14,629		13,015
2021 & 2020	55,492		14,464
2022 & 2021	36,541		42,046
2023 & 2022	30,484		36,384
2024 & 2023	10,915		27,901
Revolving Loans	46,961		49,725
Revolving Converted to Term Loans	464		22,330
Total	229,594		229,939
Current period gross charge-offs
Gross charge-offs, prior	0		(1)
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	0
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	0		0
Revolving Converted to Term Loans	0		(242)
Total gross charge-offs	0	(107)	(243)
Commercial | Pass
Credit quality categories
Prior	33,571		23,771
2020 & 2019	14,629		12,946
2021 & 2020	55,492		14,464
2022 & 2021	35,027		41,621
2023 & 2022	29,904		35,897
2024 & 2023	10,915		27,901
Revolving Loans	46,160		49,160
Revolving Converted to Term Loans	394		22,284
Total	226,092		228,044
Commercial | Special Mention
Credit quality categories
Prior	135		143
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	1,514		425
2023 & 2022	580		0
2024 & 2023	0		0
Revolving Loans	500		251
Revolving Converted to Term Loans	70		0
Total	2,799		819
Commercial | Substandard
Credit quality categories
Prior	402		160
2020 & 2019	0		69
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	0		487
2024 & 2023	0		0
Revolving Loans	301		314
Revolving Converted to Term Loans	0		46
Total	703		1,076
Consumer
Credit quality categories
Prior	1,363		621
2020 & 2019	12,836		999
2021 & 2020	71,514		14,163
2022 & 2021	137,542		76,709
2023 & 2022	83,756		144,287
2024 & 2023	17,387		91,415
Revolving Loans	678		702
Revolving Converted to Term Loans	0		0
Total	325,076		328,896
Current period gross charge-offs
Gross charge-offs, prior	(226)		(522)
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	(46)		(16)
Gross charge-offs, 2022 & 2021	(238)		(17)
Gross charge-offs, 2023 & 2022	0		(8)
Gross charge-offs, 2024 & 2023	(15)		(4)
Revolving Loans	0		(7)
Revolving Converted to Term Loans			0
Total gross charge-offs	(525)	$ 0	(574)
Consumer | Pass
Credit quality categories
Prior	1,355		621
2020 & 2019	12,829		961
2021 & 2020	71,502		14,158
2022 & 2021	136,759		76,629
2023 & 2022	82,331		143,507
2024 & 2023	17,387		91,415
Revolving Loans	677		699
Revolving Converted to Term Loans	0		0
Total	322,840		327,990
Consumer | Special Mention
Credit quality categories
Prior	0		0
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	1,317		0
2024 & 2023	0		0
Revolving Loans	0		2
Revolving Converted to Term Loans	0		0
Total	1,317		2
Consumer | Substandard
Credit quality categories
Prior	8		0
2020 & 2019	7		38
2021 & 2020	12		5
2022 & 2021	783		80
2023 & 2022	108		780
2024 & 2023	0		0
Revolving Loans	1		1
Revolving Converted to Term Loans	0		0
Total	919		904
Credit Cards
Credit quality categories
Prior	0		0
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	6,921		6,583
Revolving Converted to Term Loans	0		0
Total	6,921		6,583
Current period gross charge-offs
Gross charge-offs, prior	0		0
Gross charge-offs, 2020 & 2019	0		0
Gross charge-offs, 2021 & 2020	0		0
Gross charge-offs, 2022 & 2021	0		0
Gross charge-offs, 2023 & 2022	0		0
Gross charge-offs, 2024 & 2023	0		0
Revolving Loans	(116)		(111)
Revolving Converted to Term Loans	0		0
Total gross charge-offs	(116)		(111)
Credit Cards | Performing
Credit quality categories
Prior	0		0
2020 & 2019	0		0
2021 & 2020	0		0
2022 & 2021	0		0
2023 & 2022	0		0
2024 & 2023	0		0
Revolving Loans	6,921		6,583
Revolving Converted to Term Loans	0		0
Total	$ 6,921		$ 6,583