Loans - Outstanding Principal and Carrying Amount of Acquired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Outstanding principal balance and the carrying amount of loan acquired [Abstract]
Outstanding principal balance	$ 60,069	$ 63,619
Carrying amount	55,492	58,886
Outstanding principal balance and the carrying amount of loan acquired, impaired [Abstract]
Outstanding principal balance	23,150	24,500
Carrying amount	$ 19,339	$ 20,611