Portfolio Loans Receivable - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	$ 1,616,423	$ 1,531,202
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	1,594,905	1,492,799
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	11,767	24,523
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	9,751	13,880
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Residential | Real estate:
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	430,244	401,607
Residential | Real estate: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	423,366	394,488
Residential | Real estate: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	1,733	2,540
Residential | Real estate: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	5,145	4,579
Residential | Real estate: | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	193,262	175,956
Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	187,682	164,066
Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	3,976	10,417
Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	1,604	1,473
Commercial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Commercial | Real estate:
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	608,646	556,339
Commercial | Real estate: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	601,627	548,244
Commercial | Real estate: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	6,058	8,070
Commercial | Real estate: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	961	25
Commercial | Real estate: | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Construction | Real estate:
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	241,249	255,147
Construction | Real estate: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	239,208	243,848
Construction | Real estate: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	3,496
Construction | Real estate: | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	2,041	7,803
Construction | Real estate: | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	142,166	141,120
Consumer | Credit card | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	142,166	141,120
Consumer | Credit card | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Credit card | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Credit card | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	856	1,033
Consumer | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	856	1,033
Consumer | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	0	0
Consumer | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, gross	$ 0	$ 0