Purchased Loans - Changes in Restructured Loans (Details) - Purchased $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Number of Loans
Beginning balance (loans) | loan	54	72
Additional loans with concessions (loans) | loan	5	5
Reclassified as performing (loans) | loan	14	4
Reclassified as nonperforming (loans) | loan	(11)	(13)
Paid in full (loans) | loan	(7)	(14)
Charge-offs (loans) | loan	(1)
Principal paydowns (loans) | loan	0	0
Measurement period adjustment on recently acquired loans (loans) | loan	0
Ending balance (loans) | loan	54	54
Recorded Investment
Beginning balance | $	$ 7,495	$ 8,965
Additional advances or loans with concessions | $	3,168	712
Reclassified from nonperforming | $	1,931	435
Reclassified as nonperforming | $	(1,964)	(1,229)
Paid in full | $	(370)	(744)
Charge-offs | $	(101)
Principal paydowns | $	(508)	(644)
Measurement period adjustment on recently acquired loans | $	(2,376)
Ending balance | $	$ 7,275	$ 7,495