Subordinated Debentures - Summarized Activities of Subordinated Debentures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Weighted average interest rate at year-end	5.33%	5.38%
Subordinated notes
Debt Instrument [Line Items]
Average balance outstanding	$ 410,067	$ 377,037
Weighted average rate	5.47%	5.48%
Maximum amount outstanding at any month-end during the year	$ 501,647	$ 501,511
Balance outstanding at end of year	$ 330,567	$ 501,511