Allowance for Credit Losses - Credit risk profile of loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Nonperforming loans past due			90 days
Current period gross charge offs, Total	$ 3,543	$ 2,411	$ 7,919	$ 5,665
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	189,122		189,122		$ 424,209
Prior year	376,698		376,698		217,824
Two years before current year	182,515		182,515		145,349
Three years before current year	117,608		117,608		54,134
Four years before current year	42,794		42,794		35,258
Prior	145,806		145,806		129,134
Revolving Loans	69,065		69,065		69,873
Total loans	1,123,608		1,123,608		1,075,781
Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	58		58		937
Prior year	993		993		990
Two years before current year	736		736		681
Three years before current year	671		671		932
Four years before current year	712		712		366
Prior	1,842		1,842		2,040
Revolving Loans	70		70		178
Total loans	5,082		5,082		6,124
Total other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	189,180		189,180		425,146
Prior year	377,691		377,691		218,814
Two years before current year	183,251		183,251		146,030
Three years before current year	118,279		118,279		55,066
Four years before current year	43,506		43,506		35,624
Prior	147,648		147,648		131,174
Revolving Loans	69,135		69,135		70,051
Total loans	1,128,690		1,128,690		1,081,905
Residential | First Liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	22,550		22,550		71,713
Prior year	76,241		76,241		70,197
Two years before current year	68,330		68,330		45,080
Three years before current year	42,893		42,893		17,109
Four years before current year	16,547		16,547		20,358
Prior	128,887		128,887		119,270
Revolving Loans	1,525		1,525		3,245
Total loans	356,973		356,973		346,972
Current period gross charge offs, Prior			142
Current period gross charge offs, Total			142
Residential | First Liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	22,550		22,550		71,607
Prior year	76,215		76,215		70,197
Two years before current year	68,330		68,330		45,080
Three years before current year	42,893		42,893		16,968
Four years before current year	16,503		16,503		20,258
Prior	127,413		127,413		117,488
Revolving Loans	1,525		1,525		3,245
Total loans	355,429		355,429		344,843
Residential | First Liens | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year					106
Prior year	26		26
Three years before current year					141
Four years before current year	44		44		100
Prior	1,474		1,474		1,782
Total loans	1,544		1,544		2,129
Residential | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	62		62		1,995
Prior year	424		424		943
Two years before current year					86
Three years before current year	27		27		115
Four years before current year	133		133		69
Prior	992		992		860
Revolving Loans	61,813		61,813		60,051
Total loans	63,451		63,451		64,119
Residential | Home Equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	62		62		1,995
Prior year	398		398		943
Two years before current year					8
Three years before current year	8		8		115
Four years before current year	133		133		55
Prior	920		920		820
Revolving Loans	61,755		61,755		59,875
Total loans	63,276		63,276		63,811
Residential | Home Equity | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Prior year	26		26
Two years before current year					78
Three years before current year	19		19
Four years before current year					14
Prior	72		72		40
Revolving Loans	58		58		176
Total loans	175		175		308
Residential | Junior Liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,541		7,541		19,074
Prior year	18,253		18,253		10,489
Two years before current year	9,271		9,271		7,584
Three years before current year	6,557		6,557		5,920
Four years before current year	5,114		5,114		5,505
Prior	10,018		10,018		6,336
Revolving Loans	899		899		1,928
Total loans	57,653		57,653		56,836
Residential | Junior Liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,541		7,541		19,074
Prior year	18,253		18,253		10,485
Two years before current year	9,263		9,263		7,507
Three years before current year	6,451		6,451		5,830
Four years before current year	5,049		5,049		5,366
Prior	9,838		9,838		6,195
Revolving Loans	899		899		1,928
Total loans	57,294		57,294		56,385
Residential | Junior Liens | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Prior year					4
Two years before current year	8		8		77
Three years before current year	106		106		90
Four years before current year	65		65		139
Prior	180		180		141
Total loans	359		359		451
Residential | All Other Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,987		2,987		11,542
Prior year	11,662		11,662		9,923
Two years before current year	7,183		7,183		501
Three years before current year	440		440		1,340
Four years before current year	1,139		1,139		533
Prior	1,627		1,627		1,600
Revolving Loans	133		133
Total loans	25,171		25,171		25,439
Residential | All Other Residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,987		2,987		11,542
Prior year	11,662		11,662		9,923
Two years before current year	7,183		7,183		501
Three years before current year	440		440		915
Four years before current year	736		736		498
Prior	1,580		1,580		1,582
Revolving Loans	133		133
Total loans	24,721		24,721		24,961
Residential | All Other Residential | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Three years before current year					425
Four years before current year	403		403		35
Prior	47		47		18
Total loans	450		450		478
Consumer | Motor Vehicle
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	148,464		148,464		307,378
Prior year	261,331		261,331		119,101
Two years before current year	92,788		92,788		88,581
Three years before current year	65,407		65,407		29,241
Four years before current year	19,562		19,562		8,718
Prior	5,242		5,242		2,277
Revolving Loans					6
Total loans	592,794		592,794		555,302
Current period gross charge offs, 2023			56
Current period gross charge offs, 2022			3,861
Current period gross charge offs, 2021			1,931
Current period gross charge offs, 2020			855
Current period gross charge offs, 2019			277
Current period gross charge offs, Prior			144
Current period gross charge offs, Total			7,124
Consumer | Motor Vehicle | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	148,410		148,410		306,565
Prior year	260,415		260,415		118,362
Two years before current year	92,262		92,262		88,144
Three years before current year	64,929		64,929		29,004
Four years before current year	19,388		19,388		8,652
Prior	5,185		5,185		2,230
Revolving Loans					6
Total loans	590,589		590,589		552,963
Consumer | Motor Vehicle | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	54		54		813
Prior year	916		916		739
Two years before current year	526		526		437
Three years before current year	478		478		237
Four years before current year	174		174		66
Prior	57		57		47
Total loans	2,205		2,205		2,339
Consumer | All Other Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,576		7,576		13,444
Prior year	9,780		9,780		8,161
Two years before current year	5,679		5,679		4,198
Three years before current year	2,955		2,955		1,341
Four years before current year	1,011		1,011		441
Prior	882		882		831
Revolving Loans	4,765		4,765		4,821
Total loans	32,648		32,648		33,237
Current period gross charge offs, 2022			38
Current period gross charge offs, 2021			30
Current period gross charge offs, 2020			11
Current period gross charge offs, Revolving Loans			59
Current period gross charge offs, Total			138
Consumer | All Other Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,572		7,572		13,426
Prior year	9,755		9,755		7,914
Two years before current year	5,477		5,477		4,109
Three years before current year	2,887		2,887		1,302
Four years before current year	985		985		429
Prior	870		870		819
Revolving Loans	4,753		4,753		4,819
Total loans	32,299		32,299		32,818
Consumer | All Other Consumer | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4		4		18
Prior year	25		25		247
Two years before current year	202		202		89
Three years before current year	68		68		39
Four years before current year	26		26		12
Prior	12		12		12
Revolving Loans	12		12		2
Total loans	$ 349		$ 349		$ 419