Allowance for Credit Losses - Credit risk profile of loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Nonperforming loans past due	90 days
Current period gross charge offs, Total	$ 4,376	$ 3,254
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	80,825		$ 424,209
Prior year	405,944		217,824
Two years before current year	198,813		145,349
Three years before current year	131,020		54,134
Four years before current year	48,005		35,258
Prior	154,752		129,134
Revolving Loans	68,261		69,873
Total loans	1,087,620		1,075,781
Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			937
Prior year	1,064		990
Two years before current year	1,369		681
Three years before current year	811		932
Four years before current year	879		366
Prior	1,889		2,040
Revolving Loans	42		178
Total loans	6,054		6,124
Total other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	80,825		425,146
Prior year	407,008		218,814
Two years before current year	200,182		146,030
Three years before current year	131,831		55,066
Four years before current year	48,884		35,624
Prior	156,641		131,174
Revolving Loans	68,303		70,051
Total loans	1,093,674		1,081,905
Residential | First Liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,258		71,713
Prior year	74,742		70,197
Two years before current year	69,849		45,080
Three years before current year	44,378		17,109
Four years before current year	16,818		20,358
Prior	134,545		119,270
Revolving Loans	2,835		3,245
Total loans	352,425		346,972
Current period gross charge offs, Prior	79
Current period gross charge offs, Total	79
Residential | First Liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,258		71,607
Prior year	74,715		70,197
Two years before current year	69,431		45,080
Three years before current year	44,378		16,968
Four years before current year	16,703		20,258
Prior	133,024		117,488
Revolving Loans	2,835		3,245
Total loans	350,344		344,843
Residential | First Liens | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			106
Prior year	27
Two years before current year	418
Three years before current year			141
Four years before current year	115		100
Prior	1,521		1,782
Total loans	2,081		2,129
Residential | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	62		1,995
Prior year	590		943
Two years before current year			86
Three years before current year	28		115
Four years before current year	169		69
Prior	863		860
Revolving Loans	60,015		60,051
Total loans	61,727		64,119
Residential | Home Equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	62		1,995
Prior year	590		943
Two years before current year			8
Three years before current year	8		115
Four years before current year	169		55
Prior	810		820
Revolving Loans	59,975		59,875
Total loans	61,614		63,811
Residential | Home Equity | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Two years before current year			78
Three years before current year	20
Four years before current year			14
Prior	53		40
Revolving Loans	40		176
Total loans	113		308
Residential | Junior Liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,874		19,074
Prior year	19,375		10,489
Two years before current year	9,772		7,584
Three years before current year	7,110		5,920
Four years before current year	5,516		5,505
Prior	10,904		6,336
Revolving Loans	1,020		1,928
Total loans	56,571		56,836
Residential | Junior Liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,874		19,074
Prior year	19,375		10,485
Two years before current year	9,764		7,507
Three years before current year	7,038		5,830
Four years before current year	5,452		5,366
Prior	10,747		6,195
Revolving Loans	1,020		1,928
Total loans	56,270		56,385
Residential | Junior Liens | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Prior year			4
Two years before current year	8		77
Three years before current year	72		90
Four years before current year	64		139
Prior	157		141
Total loans	301		451
Residential | All Other Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	747		11,542
Prior year	12,414		9,923
Two years before current year	8,261		501
Three years before current year	488		1,340
Four years before current year	1,169		533
Prior	1,573		1,600
Total loans	24,652		25,439
Residential | All Other Residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	747		11,542
Prior year	12,414		9,923
Two years before current year	8,261		501
Three years before current year	488		915
Four years before current year	753		498
Prior	1,523		1,582
Total loans	24,186		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	416		35
Prior	50		18
Total loans	466		478
Consumer | Motor Vehicle
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	64,910		307,378
Prior year	288,213		119,101
Two years before current year	105,484		88,581
Three years before current year	76,241		29,241
Four years before current year	24,040		8,718
Prior	7,668		2,277
Revolving Loans	6		6
Total loans	566,562		555,302
Current period gross charge offs, 2022	1,876
Current period gross charge offs, 2021	1,247
Current period gross charge offs, 2020	561
Current period gross charge offs, 2019	149
Current period gross charge offs, Prior	70
Current period gross charge offs, Total	3,903
Consumer | Motor Vehicle | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	64,910		306,565
Prior year	287,205		118,362
Two years before current year	104,775		88,144
Three years before current year	75,616		29,004
Four years before current year	23,788		8,652
Prior	7,578		2,230
Revolving Loans	6		6
Total loans	563,878		552,963
Consumer | Motor Vehicle | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			813
Prior year	1,008		739
Two years before current year	709		437
Three years before current year	625		237
Four years before current year	252		66
Prior	90		47
Total loans	2,684		2,339
Consumer | All Other Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,974		13,444
Prior year	11,674		8,161
Two years before current year	6,816		4,198
Three years before current year	3,586		1,341
Four years before current year	1,172		441
Prior	1,088		831
Revolving Loans	4,427		4,821
Total loans	31,737		33,237
Current period gross charge offs, 2022	28
Current period gross charge offs, 2021	23
Current period gross charge offs, 2020	7
Current period gross charge offs, Revolving Loans	30
Current period gross charge offs, Total	88
Consumer | All Other Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,974		13,426
Prior year	11,645		7,914
Two years before current year	6,582		4,109
Three years before current year	3,492		1,302
Four years before current year	1,140		429
Prior	1,070		819
Revolving Loans	4,425		4,819
Total loans	31,328		32,818
Consumer | All Other Consumer | Nonperforming Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current year			18
Prior year	29		247
Two years before current year	234		89
Three years before current year	94		39
Four years before current year	32		12
Prior	18		12
Revolving Loans	2		2
Total loans	$ 409		$ 419