CONDENSED HOLDING COMPANY ONLY FINANCIAL STATEMENTS - CONDENSED STATEMENTS OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS:
Cash and due from banks	$ 393,722	$ 243,603
Securities available-for-sale, at fair value	1,563,711	538,861
Marketable equity securities at fair value		5,970
Other assets	65,224	27,551
Total assets	12,066,364	6,781,610
LIABILITIES AND STOCKHOLDERS' EQUITY:
Subordinated debt, net	197,096	114,052
Other liabilities	83,981	40,082
Stockholders' equity	1,192,620	701,096	$ 596,758	$ 602,081
Total liabilities and stockholders' equity	12,066,364	6,781,610
Parent Company
ASSETS:
Cash and due from banks	27,364	106,014
Securities available-for-sale, at fair value	3,068
Marketable equity securities at fair value		5,970
Investment in subsidiaries	1,366,796	703,107
Other assets	4,285	1,018
Total assets	1,401,513	816,109
LIABILITIES AND STOCKHOLDERS' EQUITY:
Subordinated debt, net	197,096	114,052
Other liabilities	11,797	961
Stockholders' equity	1,192,620	701,096
Total liabilities and stockholders' equity	$ 1,401,513	$ 816,109