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Loans and Allowance for Credit Losses - Financing receivable credit quality indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consumer Loan
Financing Receivable Credit Quality Indicators	$ 14,047	$ 13,625	$ 5,987	$ 2,077	$ 1,025
Prior to 2017 | Consumer Loan
Financing Receivable Credit Quality Indicators		740
Revolving Credit Facility | Consumer Loan
Financing Receivable Credit Quality Indicators		42,089
Total Credit Quality Indicator for Years | Consumer Loan
Financing Receivable Credit Quality Indicators		79,590
Purchase Credit Deteriorated | Pass | Construction Real Estate
Financing Receivable Credit Quality Indicators	54,966	50,216	7,812
Purchase Credit Deteriorated | Substandard | Consumer Loan
Financing Receivable Credit Quality Indicators	51	15		37
Purchase Credit Deteriorated | Substandard | Commercial Loan
Financing Receivable Credit Quality Indicators	136	1,574	1,575	10	180
Purchase Credit Deteriorated | Residential real estate loans | Substandard
Financing Receivable Credit Quality Indicators	4,714	145	226	54	57
Purchase Credit Deteriorated | Commercial Real Estate
Financing Receivable Credit Quality Indicators	168,801	213,746	139,209	145,565	95,740
Purchase Credit Deteriorated | Commercial Real Estate | Pass
Financing Receivable Credit Quality Indicators	158,927	198,979	128,221	138,403	81,442
Purchase Credit Deteriorated | Commercial Real Estate | Watch
Financing Receivable Credit Quality Indicators	4,025	10,580	9,541	7,028	14,245
Purchase Credit Deteriorated | Commercial Real Estate | Substandard
Financing Receivable Credit Quality Indicators	5,849	4,187	559	134	53
Purchase Credit Deteriorated | Commercial Real Estate | Doubtful
Financing Receivable Credit Quality Indicators			888
Purchase Credit Deteriorated | Prior to 2017 | Substandard | Consumer Loan
Financing Receivable Credit Quality Indicators		7
Purchase Credit Deteriorated | Prior to 2017 | Substandard | Commercial Loan
Financing Receivable Credit Quality Indicators		5
Purchase Credit Deteriorated | Prior to 2017 | Residential real estate loans | Substandard
Financing Receivable Credit Quality Indicators		913
Purchase Credit Deteriorated | Prior to 2017 | Residential real estate loans | Doubtful
Financing Receivable Credit Quality Indicators		32
Purchase Credit Deteriorated | Prior to 2017 | Commercial Real Estate
Financing Receivable Credit Quality Indicators		107,595
Purchase Credit Deteriorated | Prior to 2017 | Commercial Real Estate | Pass
Financing Receivable Credit Quality Indicators		106,507
Purchase Credit Deteriorated | Prior to 2017 | Commercial Real Estate | Watch
Financing Receivable Credit Quality Indicators		43
Purchase Credit Deteriorated | Prior to 2017 | Commercial Real Estate | Substandard
Financing Receivable Credit Quality Indicators		1,045
Purchase Credit Deteriorated | Revolving Credit Facility | Substandard | Consumer Loan
Financing Receivable Credit Quality Indicators		99
Purchase Credit Deteriorated | Revolving Credit Facility | Substandard | Commercial Loan
Financing Receivable Credit Quality Indicators		2,275
Purchase Credit Deteriorated | Revolving Credit Facility | Commercial Real Estate
Financing Receivable Credit Quality Indicators		31,908
Purchase Credit Deteriorated | Revolving Credit Facility | Commercial Real Estate | Pass
Financing Receivable Credit Quality Indicators		31,017
Purchase Credit Deteriorated | Revolving Credit Facility | Commercial Real Estate | Watch
Financing Receivable Credit Quality Indicators		891
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Pass | Construction Real Estate
Financing Receivable Credit Quality Indicators		112,994
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Substandard | Consumer Loan
Financing Receivable Credit Quality Indicators		209
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Substandard | Commercial Loan
Financing Receivable Credit Quality Indicators		5,755
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Residential real estate loans | Substandard
Financing Receivable Credit Quality Indicators		6,109
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Residential real estate loans | Doubtful
Financing Receivable Credit Quality Indicators		32
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Commercial Real Estate
Financing Receivable Credit Quality Indicators		902,564
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Commercial Real Estate | Pass
Financing Receivable Credit Quality Indicators		843,496
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Commercial Real Estate | Watch
Financing Receivable Credit Quality Indicators		46,353
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Commercial Real Estate | Substandard
Financing Receivable Credit Quality Indicators		11,827
Purchase Credit Deteriorated | Total Credit Quality Indicator for Years | Commercial Real Estate | Doubtful
Financing Receivable Credit Quality Indicators		888
Total Loans
Financing Receivable Credit Quality Indicators	511,086	650,794	238,966	202,683	137,926
Total Loans | Commercial Loan
Financing Receivable Credit Quality Indicators	90,889	155,702	28,382	11,058	9,649
Total Loans | Construction Real Estate
Financing Receivable Credit Quality Indicators	54,966	50,216	7,812
Total Loans | Pass
Financing Receivable Credit Quality Indicators	495,178	634,048	215,116	195,420	123,295
Total Loans | Pass | Consumer Loan
Financing Receivable Credit Quality Indicators	13,996	13,610	5,987	2,040	1,025
Total Loans | Pass | Commercial Loan
Financing Receivable Credit Quality Indicators	89,745	154,004	26,743	11,048	9,469
Total Loans | Watch
Financing Receivable Credit Quality Indicators	5,158	10,825	20,602	7,028	14,341
Total Loans | Watch | Commercial Loan
Financing Receivable Credit Quality Indicators	1,008	124	64
Total Loans | Substandard
Financing Receivable Credit Quality Indicators	10,750	5,921	2,360	235	290
Total Loans | Doubtful
Financing Receivable Credit Quality Indicators			888
Total Loans | Residential real estate loans
Financing Receivable Credit Quality Indicators	182,383	217,505	57,576	43,983	31,512
Total Loans | Residential real estate loans | Pass
Financing Receivable Credit Quality Indicators	177,544	217,239	46,353	$ 43,929	31,359
Total Loans | Residential real estate loans | Watch
Financing Receivable Credit Quality Indicators	$ 125	121	$ 10,997		$ 96
Total Loans | Prior to 2017
Financing Receivable Credit Quality Indicators		218,582
Total Loans | Prior to 2017 | Commercial Loan
Financing Receivable Credit Quality Indicators		11,672
Total Loans | Prior to 2017 | Pass
Financing Receivable Credit Quality Indicators		215,712
Total Loans | Prior to 2017 | Pass | Consumer Loan
Financing Receivable Credit Quality Indicators		733
Total Loans | Prior to 2017 | Pass | Commercial Loan
Financing Receivable Credit Quality Indicators		11,667
Total Loans | Prior to 2017 | Watch
Financing Receivable Credit Quality Indicators		868
Total Loans | Prior to 2017 | Substandard
Financing Receivable Credit Quality Indicators		1,970
Total Loans | Prior to 2017 | Doubtful
Financing Receivable Credit Quality Indicators		32
Total Loans | Prior to 2017 | Residential real estate loans
Financing Receivable Credit Quality Indicators		98,575
Total Loans | Prior to 2017 | Residential real estate loans | Pass
Financing Receivable Credit Quality Indicators		96,805
Total Loans | Prior to 2017 | Residential real estate loans | Watch
Financing Receivable Credit Quality Indicators		825
Total Loans | Revolving Credit Facility
Financing Receivable Credit Quality Indicators		199,146
Total Loans | Revolving Credit Facility | Commercial Loan
Financing Receivable Credit Quality Indicators		119,993
Total Loans | Revolving Credit Facility | Pass
Financing Receivable Credit Quality Indicators		194,812
Total Loans | Revolving Credit Facility | Pass | Consumer Loan
Financing Receivable Credit Quality Indicators		41,990
Total Loans | Revolving Credit Facility | Pass | Commercial Loan
Financing Receivable Credit Quality Indicators		116,649
Total Loans | Revolving Credit Facility | Watch
Financing Receivable Credit Quality Indicators		1,960
Total Loans | Revolving Credit Facility | Watch | Commercial Loan
Financing Receivable Credit Quality Indicators		1,069
Total Loans | Revolving Credit Facility | Substandard
Financing Receivable Credit Quality Indicators		2,374
Total Loans | Revolving Credit Facility | Residential real estate loans
Financing Receivable Credit Quality Indicators		5,156
Total Loans | Revolving Credit Facility | Residential real estate loans | Pass
Financing Receivable Credit Quality Indicators		5,156
Total Loans | Total Credit Quality Indicator for Years
Financing Receivable Credit Quality Indicators		2,159,183
Total Loans | Total Credit Quality Indicator for Years | Commercial Loan
Financing Receivable Credit Quality Indicators		427,345
Total Loans | Total Credit Quality Indicator for Years | Construction Real Estate
Financing Receivable Credit Quality Indicators		112,994
Total Loans | Total Credit Quality Indicator for Years | Pass
Financing Receivable Credit Quality Indicators		2,073,581
Total Loans | Total Credit Quality Indicator for Years | Pass | Consumer Loan
Financing Receivable Credit Quality Indicators		79,381
Total Loans | Total Credit Quality Indicator for Years | Pass | Commercial Loan
Financing Receivable Credit Quality Indicators		419,325
Total Loans | Total Credit Quality Indicator for Years | Watch
Financing Receivable Credit Quality Indicators		60,782
Total Loans | Total Credit Quality Indicator for Years | Watch | Commercial Loan
Financing Receivable Credit Quality Indicators		2,265
Total Loans | Total Credit Quality Indicator for Years | Substandard
Financing Receivable Credit Quality Indicators		23,900
Total Loans | Total Credit Quality Indicator for Years | Doubtful
Financing Receivable Credit Quality Indicators		920
Total Loans | Total Credit Quality Indicator for Years | Residential real estate loans
Financing Receivable Credit Quality Indicators		636,690
Total Loans | Total Credit Quality Indicator for Years | Residential real estate loans | Pass
Financing Receivable Credit Quality Indicators		618,385
Total Loans | Total Credit Quality Indicator for Years | Residential real estate loans | Watch
Financing Receivable Credit Quality Indicators		$ 12,164

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