Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016		Dec. 31, 2015
Supplemental Schedule of Cash and Cash Equivalents:
Cash and due from banks	$ 26,949	$ 37,679	$ 20,268	[1]
Interest-bearing deposits in other banks	76,271	35,138	32,939	[1]
Cash and Cash Equivalents	103,220	72,817	$ 53,207		$ 95,337
Cash paid for:
Interest on deposits and borrowed funds	5,135	4,813
Income taxes	5,465	5,440
Noncash investing and financing activities:
Transfer of loans to other real estate owned	1,233	97
Unrealized gains on securities available for sale	$ 1,596	$ 720

[1] Derived from audited consolidated financial statements.