PARENT COMPANY STATEMENTS - Condensed Statements of Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 209,896	$ 1,875,064
Investment in and advances to:
Other assets	446,304	313,854
Total assets	15,835,651	15,552,657	$ 13,931,094
Liabilities and shareholders' equity:
Accrued interest and other liabilities	133,863	210,797
Shareholders' equity	1,551,705	2,100,807	$ 2,104,107	$ 1,855,234
Total liabilities and shareholders' equity	15,835,651	15,552,657
Parent company
Assets:
Cash and cash equivalents	160,045	154,374
Investment securities	7,881	8,679
Investment in and advances to:
Bank subsidiary	1,194,314	1,721,520
Non-bank subsidiaries	207,172	232,096
Other assets	17,106	18,462
Total assets	1,586,518	2,135,131
Liabilities and shareholders' equity:
Accrued interest and other liabilities	31,564	31,047
Borrowings	3,249	3,277
Shareholders' equity	1,551,705	2,100,807
Total liabilities and shareholders' equity	$ 1,586,518	$ 2,135,131