Investment Securities - Narrative (Details) $ in Thousands	Jun. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged as collateral	$ 483,230	$ 416,155
Book value of securities sold under agreements to repurchase	119,266	116,691
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	807	14,253
Held-to-maturity unrealized losses	314	$ 4,741
State and municipal
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 200
Number of securities in unrealized loss positions | security	7
Held-to-maturity unrealized losses	$ 22
Held-to-maturity, number of securities in unrealized loss positions | security	2
U.S. Government-sponsored agency securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Held-to-maturity unrealized losses	$ 66
Held-to-maturity, number of securities in unrealized loss positions | security	3
U.S. Government-sponsored mortgage-backed securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 607
Number of securities in unrealized loss positions | security	29
Held-to-maturity unrealized losses	$ 226
Held-to-maturity, number of securities in unrealized loss positions | security	14