Credit Quality and Nonperforming Assets - Purchased Credit Impaired Loans - Tabular Disclosure (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance, Total	[1]	$ 16,270	$ 17,050
Impaired Financing Receivable, Carrying Value, Total	[2]	15,787	16,072
Purchased Credit Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance, Total		91	103
Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance, Total		$ 91	$ 103

[1] Contractual principal balance due from customer.

[2] Principal balance on Company’s books, less any direct charge offs.