Investment Securities - Summary of Interest Income on Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Total taxable interest income	$ 1,660	$ 1,238	$ 3,240	$ 2,406
Total tax-exempt interest income	30	64	82	150
Total interest income	1,690	1,302	3,322	2,556
U.S. Treasury and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Total taxable interest income	1,071	895	2,142	1,785
Other
Debt Securities, Available-for-sale [Line Items]
Total taxable interest income	589	343	1,098	621
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Total tax-exempt interest income	$ 30	$ 64	$ 82	$ 150