Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 229,342	$ 89,394
INVESTING ACTIVITIES
Net decrease (increase) in loans held for investment	460,772	(853,709)
Available-for-sale debt securities:
Proceeds from sales	0	226,099
Proceeds from maturities, prepayments and calls	439,101	353,835
Purchases of securities	(1,457,566)	(212,777)
Held-to-maturity debt securities:
Proceeds from maturities, prepayments and calls	55,952	101,816
Purchases of securities	(228,307)	(18,245)
Equity securities:
Proceeds from sales		50
Proceeds from bank owned life insurance		10
Purchases of premises and equipment – net	(4,603)	(4,861)
Sale of portfolio loans		37,195
Net cash used in investing activities	(734,651)	(370,587)
FINANCING ACTIVITIES
Increase in deposits	891,121	1,188,717
Proceeds from Federal Home Loan Bank borrowings		475,000
Repayment of Federal Home Loan Bank borrowings	(235,105)	(761,098)
(Decrease) increase in other short-term borrowings	(106,683)	115,915
Principal repayments of finance lease obligations	(219)	(208)
Decrease in federal funds purchased		(7,500)
Repayment of junior subordinated debt		(6,702)
Dividends paid to common shareholders	(43,509)	(42,450)
Dividends paid to preferred shareholders	(5,063)
Treasury shares purchased - net	(54,376)	(24,943)
Net cash provided by financing activities	446,166	936,731
Net (decrease) increase in cash, cash equivalents and restricted cash	(59,143)	655,538
Cash, cash equivalents and restricted cash at beginning of the period	905,447	234,796
Cash, cash equivalents and restricted cash at end of the period	846,304	890,334
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	18,917	45,965
Income taxes paid	22,055	1,125
Transfers of loans to other real estate owned	$ 466	263
Transfers of portfolio loans to loans held for sale		$ 37,195