Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows From Operating Activities
Net income	$ 181,272	$ 159,909
Adjustments to reconcile net income to net cash provided by operating activities
Recapture for credit losses	(450)	(6,300)
Stock-based compensation expense	12,059	10,835
Depreciation, amortization and accretion	35,971	11,383
Investment securities gain, net	0	314
Net realized gain on sale of premises and equipment and loans held for investment	4,985	268
Net realized loss on sale and valuation adjustments of OREO	(181)	(40)
Gain on bank owned life insurance death benefit	610	209
Originations of loans held for sale	105,392	263,367
Proceeds from sales of loans held for sale	113,698	278,187
Change in fair value of loans held for sale	217	306
Net change in:
Interest receivable	(5,633)	1,945
Interest payable	(79)	(52)
Other assets	(27,620)	15,761
Other liabilities	25,088	(18,755)
Net cash provided by operating activities	223,717	189,101
Cash Flows From Investing Activities
Loans originated, net of principal collected	(1,069,862)	108,551
Investment in low income housing tax credit partnerships	(1,229)	(1,106)
Purchases of Debt Securities, Available-for-sale	185,800	2,408,578
Purchases of debt securities held to maturity	(97,658)	(112,372)
Purchases of loans held for investment	0	176,545
Purchases of premises and equipment	(5,557)	(4,334)
Payments to Acquire Federal Home Loan Bank Stock	7,441	1
Proceeds from Sale of Debt Securities, Available-for-sale	0	26,914
Proceeds from principal repayments and maturities of debt securities available for sale	613,046	586,288
Proceeds from repayments and maturities of securities held to maturity	149,562	42,653
Proceeds from sales of premises and equipment	36,973	4,287
Proceeds from redemption of Federal Home Loan Bank stock	7,161	1
Proceeds from sales of other real estate and other personal property owned	200	132
Proceeds from bank owned life insurance death benefit	1,108	671
Net cash used in investing activities	(559,497)	(1,933,439)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	(68,238)	2,083,537
Net decrease in sweep repurchase agreements	(37,280)	(33,819)
Proceeds from FHLB advances	186,030	20
Proceeds from FRB borrowings	30	10
Proceeds from employee stock purchase plan	2,110	2,351
Repayment of FHLB advances	(179,030)	(20)
Repayment of FRB borrowings	(30)	(10)
Payments of Common Stock Dividends	70,876	59,922
Payments for purchase and retirement of common stock	3,975	4,100
Net cash provided by (used in) financing activities	(171,259)	1,988,047
Increase (decrease) in cash and cash equivalents	(507,039)	243,709
Cash and cash equivalents at beginning of period	824,714	653,766
Cash and cash equivalents at end of period	317,675	897,475
Supplemental Information:
Cash paid for interest	10,282	6,085
Income Taxes Paid, Net	48,952	45,122
Non-cash investing and financing activities
Securities transfer from AFS to HTM, fair value	0	2,012,123
Premises and equipment expenditures incurred but not yet paid	51	87
Change in dividends payable included in other liabilities	$ (151)	$ 23,927