Acquired Credit Impaired Loans Loans Acquired in Business Combination, Not Considered Impaired (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 719	$ 743		$ 635	$ 669
Columbus First Bancorp, Inc. [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Business Combination, Acquired Receivable, Fair Value		$ 282,133	$ 282,748