Business Acquisition - Summary of Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 1,755
ASSETS
Premises and equipment, net (Note 6)	32,113	$ 32,746
Other assets	9,844	1,621
Total assets	1,277,351	1,053,756
Liabilities:
Other liabilities	10,131	2,462
Total liabilities	1,118,977	$ 895,354
Mortgage World Bankers Inc
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	1,755
ASSETS
Cash and cash equivalents	750
Mortgage loans held for sale, at fair value	10,549
Premises and equipment, net (Note 6)	302
Other assets	772
Total assets	12,373
Liabilities:
Warehouse lines of credit	9,135
Mortgage loans fundings payable	1,237
Other liabilities	246
Total liabilities	10,618
Net assets	$ 1,755