Long-Term Borrowings and Subordinated Debt - Key Terms of Junior Subordinated Debt Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	$ 45,619	$ 45,619	$ 45,619
Interest Rate at December 31, 2018	2.84%	1.88%	2.91%
2006 Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	$ 25,000	$ 25,000	$ 25,000
Stated Maturity Date	Dec. 15, 2036
Optional redemption date at par	Any time after 9/15/2011
Regulatory Capital	Tier 2
Interest Rate at December 31, 2018	4.39%
2006 Junior Subordinated Debt | 3-Month LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	1.60%
2008 Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	$ 20,619	$ 20,619	$ 20,619
Stated Maturity Date	Mar. 15, 2038
Optional redemption date at par	Any time after 3/15/2013
Regulatory Capital	Tier 1
Interest Rate at December 31, 2018	6.29%
2008 Trust Preferred Securities | 3-Month LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	3.50%