Loans and Allowance for Credit Losses - Loan risk ratings (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Financing receivable allowance for credit loss
Prior	$ 669,941
2019	158,438
2020	277,622
2021	548,277
2022	721,548
2023	158,692
Revolving loans	132,848
Revolving converted to term loans	1,315
Financing Receivable, before Allowance for Credit Loss, Total	2,668,681	$ 14,922
Gross charge-offs
2023	(107)
Total	(107)
Construction
Financing receivable allowance for credit loss
Prior	28,615
2019	7,814
2020	16,531
2021	67,834
2022	108,670
2023	20,197
Revolving loans	786
Financing Receivable, before Allowance for Credit Loss, Total	250,447
Construction \| Pass
Financing receivable allowance for credit loss
Prior	28,379
2019	7,814
2020	16,531
2021	67,810
2022	108,670
2023	20,197
Revolving loans	786
Financing Receivable, before Allowance for Credit Loss, Total	250,187
Construction \| Substandard
Financing receivable allowance for credit loss
Prior	236
2021	24
Financing Receivable, before Allowance for Credit Loss, Total	260
Residential real estate
Financing receivable allowance for credit loss
Prior	229,555
2019	38,023
2020	75,277
2021	175,925
2022	222,994
2023	53,436
Revolving loans	71,015
Financing Receivable, before Allowance for Credit Loss, Total	866,225	8,212
Residential real estate \| Pass
Financing receivable allowance for credit loss
Prior	226,659
2019	38,023
2020	75,277
2021	175,925
2022	222,994
2023	53,436
Revolving loans	70,635
Financing Receivable, before Allowance for Credit Loss, Total	862,949
Residential real estate \| Special Mention
Financing receivable allowance for credit loss
Prior	932
Revolving loans	256
Financing Receivable, before Allowance for Credit Loss, Total	1,188
Residential real estate \| Substandard
Financing receivable allowance for credit loss
Prior	1,964
Revolving loans	124
Financing Receivable, before Allowance for Credit Loss, Total	2,088
Commercial real estate
Financing receivable allowance for credit loss
Prior	392,079
2019	106,458
2020	155,585
2021	174,545
2022	208,815
2023	49,380
Revolving loans	10,047
Revolving converted to term loans	28
Financing Receivable, before Allowance for Credit Loss, Total	1,096,937	1,079
Commercial real estate \| Pass
Financing receivable allowance for credit loss
Prior	389,646
2019	106,316
2020	155,585
2021	173,010
2022	208,815
2023	49,380
Revolving loans	10,047
Revolving converted to term loans	28
Financing Receivable, before Allowance for Credit Loss, Total	1,092,827
Commercial real estate \| Special Mention
Financing receivable allowance for credit loss
Prior	1,762
2019	142
2021	1,535
Financing Receivable, before Allowance for Credit Loss, Total	3,439
Commercial real estate \| Substandard
Financing receivable allowance for credit loss
Prior	671
Financing Receivable, before Allowance for Credit Loss, Total	671
Commercial
Financing receivable allowance for credit loss
Prior	18,632
2019	4,291
2020	11,125
2021	35,606
2022	17,833
2023	1,211
Revolving loans	50,327
Revolving converted to term loans	1,287
Financing Receivable, before Allowance for Credit Loss, Total	140,312	15
Gross charge-offs
2023	(107)
Total	(107)
Commercial \| Pass
Financing receivable allowance for credit loss
Prior	18,465
2019	4,291
2020	11,125
2021	35,137
2022	17,833
2023	1,211
Revolving loans	50,327
Revolving converted to term loans	1,287
Financing Receivable, before Allowance for Credit Loss, Total	139,676
Commercial \| Special Mention
Financing receivable allowance for credit loss
2021	469
Financing Receivable, before Allowance for Credit Loss, Total	469
Commercial \| Substandard
Financing receivable allowance for credit loss
Prior	167
Financing Receivable, before Allowance for Credit Loss, Total	167
Consumer
Financing receivable allowance for credit loss
Prior	1,060
2019	1,852
2020	19,104
2021	94,367
2022	163,236
2023	34,468
Revolving loans	673
Financing Receivable, before Allowance for Credit Loss, Total	314,760	$ 234
Consumer \| Pass
Financing receivable allowance for credit loss
Prior	1,060
2019	1,825
2020	19,104
2021	94,357
2022	163,213
2023	34,468
Revolving loans	671
Financing Receivable, before Allowance for Credit Loss, Total	314,698
Consumer \| Special Mention
Financing receivable allowance for credit loss
Revolving loans	2
Financing Receivable, before Allowance for Credit Loss, Total	2
Consumer \| Substandard
Financing receivable allowance for credit loss
2019	27
2021	10
2022	23
Financing Receivable, before Allowance for Credit Loss, Total	$ 60

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