Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities
Net income	$ 116,330	$ 106,892
Adjustments to reconcile net income to net cash provided by operating activities
Recapture for credit losses	(5,700)	(6,300)
Stock-based compensation expense	7,910	6,936
Depreciation, amortization and accretion	22,599	7,056
Investment securities gain, net	0	314
Net realized gain on sale of premises and equipment and loans held for investment	1,339	279
Net realized loss on sale and valuation adjustments of OREO	(148)	(40)
Gain on bank owned life insurance death benefit	610	209
Originations of loans held for sale	90,137	195,632
Proceeds from sales of loans held for sale	96,022	208,789
Change in fair value of loans held for sale	171	145
Net change in:
Interest receivable	(1,136)	2,484
Interest payable	18	(49)
Other assets	(7,201)	12,583
Other liabilities	24,488	(14,700)
Net cash provided by operating activities	161,563	127,442
Cash Flows From Investing Activities
Loans originated, net of principal collected	(700,946)	(177,399)
Investment in low income housing tax credit partnerships	(271)	0
Purchases of Debt Securities, Available-for-sale	183,803	1,527,512
Purchases of debt securities held to maturity	(97,658)	(22,915)
Purchases of loans held for investment	0	74,383
Purchases of premises and equipment	(3,639)	(3,087)
Proceeds from Sale of Debt Securities, Available-for-sale	0	26,914
Proceeds from principal repayments and maturities of debt securities available for sale	418,967	385,408
Proceeds from repayments and maturities of securities held to maturity	86,328	8,711
Proceeds from sales of premises and equipment	27,574	4,296
Proceeds from sales of other real estate and other personal property owned	200	132
Proceeds from bank owned life insurance death benefit	0	671
Net cash used in investing activities	(453,248)	(1,379,164)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	(52,821)	1,475,570
Net decrease in sweep repurchase agreements	(15,664)	(2,865)
Proceeds from FHLB advances	20	10
Proceeds from FRB borrowings	20	0
Proceeds from employee stock purchase plan	1,017	1,098
Repayment of FHLB advances	(20)	(10)
Repayment of FRB borrowings	(20)	0
Payments of Common Stock Dividends	47,428	40,244
Payments for purchase and retirement of common stock	3,937	4,071
Net cash provided by (used in) financing activities	(118,833)	1,429,488
Increase (decrease) in cash and cash equivalents	(410,518)	177,766
Cash and cash equivalents at beginning of period	824,714	653,766
Cash and cash equivalents at end of period	414,196	831,532
Supplemental Information:
Cash paid for interest	4,930	4,082
Income Taxes Paid, Net	15,393	28,474
Non-cash investing and financing activities
Securities transfer from AFS to HTM, fair value	0	2,012,123
Change in dividends payable included in other liabilities	$ (358)	$ (122)