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Portfolio Loans - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Dec. 31, 2020 USD ($)
Distributions of portfolio loans
Net deferred loan origination (fees) costs	$ (300)		$ (300)		$ 2,400
Net accretable purchase accounting adjustments			11,500		10,900
Loans classified as a TDR	$ 400	$ 400	$ 900	$ 900
TDRs subsequently classified as non-performing and had payment defaults | loan	0	0	0	0
Loans in the process of foreclosure	$ 200		$ 200
Commercial Loans | Included in non-performing loans
Distributions of portfolio loans
Loans classified as a TDR			$ 500	$ 500
Performing loans classified as TDRs | loan			1	3
Commercial Real Estate Loans | Included in non-performing loans
Distributions of portfolio loans
Loans classified as a TDR				$ 700
Performing loans classified as TDRs | loan				1
Retail Real Estate
Distributions of portfolio loans
Loans purchased	32,200	$ 0	$ 32,200	$ 43,900
Loans classified as a TDR		$ 200		$ 200
Performing loans classified as TDRs | loan		1		1
Retail Real Estate | Included in non-performing loans
Distributions of portfolio loans
Loans classified as a TDR			$ 100
TDRs subsequently classified as non-performing and had payment defaults | loan			1
Maximum | Commercial Real Estate Loans
Distributions of portfolio loans
Limit where loans are processed through an expedited underwriting process			$ 1,000
Watch | Commercial Loans
Distributions of portfolio loans
Limit above which loans are annually reviewed			1,000
Special Mention | Commercial Loans
Distributions of portfolio loans
Limit above which loans are annually reviewed			350
PPP Loans
Distributions of portfolio loans
Amortized cost of the loans outstanding	$ 390,395		$ 390,395		$ 446,400

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