Loans - Troubled Debt Restructurings (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) security loan	Jun. 30, 2019 USD ($) security	Jun. 30, 2020 USD ($) security loan	Jun. 30, 2019 USD ($) security	Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Abstract]
Loans classified as TDRs	$ 5,700,000		$ 5,700,000		$ 7,900,000
Number of loans modified as TDRs | security	1	0	3	0
Total modifications	$ 431,000		$ 649,000
Number of TDR loans paid off | security		2	1	3
TDR loans paid off		$ 40,000	$ 2,800,000	$ 145,000
Number of loans with post-modification changes for unpaid principal balance in loans modified as TDRs | security	0	0	0	0
Number of loans for which there was payment default within first 12 months of modification | security			1	6
Payment default within first 12 months of modification, recorded investment			$ 161,000	$ 297,000
Commitments to extend additional credit to borrowers whose loan terms have been modified in TDRs	$ 0		$ 0		$ 0
CARES Act loan restructuring, number of contracts | loan	122		122
CARES Act loan restructuring, postmodification	$ 51,300,000		$ 51,300,000