Purchased Loans - Changes in Restructured Loans (Details) - Purchased loans $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) loan
Number of Loans
Totals at January 1, 2018 (loans) | loan	68
Additional loans with concessions (loans) | loan	3
Reclassified as performing restructured loan (loan) | loan	3
Reclassified to nonperforming loans (loans) | loan	(5)
Paid in full (loans) | loan	(4)
Principal paydowns (loans) | loan	0
Totals at September 30, 2018 (loans) | loan	65
Recorded Investment
Totals at January 1, 2018 | $	$ 8,965
Additional loans with concessions | $	220
Reclassified as performing restructured loan | $	175
Reclassified to nonperforming loans | $	(688)
Paid in full | $	(411)
Principal paydowns | $	(570)
Totals at September 30, 2018 | $	$ 7,691