Subordinated Debentures - Activities for our subordinated debentures (Details) - Subordinated notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Average balance outstanding	$ 183,383	$ 107,732
Weighted average rate	5.82%	6.23%
Maximum amount outstanding at any month-end during the year	$ 233,119	$ 110,313
Balance outstanding at end of year	$ 215,145	$ 110,313
Weighted average interest rate at year-end	5.37%	6.04%