UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income	$ 168,611	$ 223,525
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	11,782	13,839
Net amortization of debt securities	11,745	24,274
Net amortization of purchase accounting adjustments and deferred loan fees and costs	(2,879)	8,533
Origination of loans held for sale	(332,582)	(639,726)
Proceeds from loans held for sale	395,216	715,700
Gain on sale of loans	(9,974)	(17,857)
Loss (gain) on sale of debt securities	202	(101)
Bank-owned life insurance income, net	(2,915)	(2,698)
Stock-based compensation, net of tax benefits	4,577	4,218
Depreciation and amortization of premises and equipment	20,322	18,952
Gain on sale and write-downs of other real estate owned, net	(118)	(125)
Amortization of core deposit intangibles	7,304	7,994
Amortization of investments in variable interest entities	15,418	13,051
Net increase in accrued interest receivable	(20,939)	(16,627)
Net increase in other assets	(1,764)	(20,827)
Net increase in accrued interest payable	87,543	331
Net (decrease) increase in other liabilities	(2,038)	18,291
Net cash provided by operating activities	349,511	350,747
Investing Activities
Sales of available-for-sale debt securities	29,972	0
Maturities, prepayments and calls of available-for-sale debt securities	479,442	914,036
Purchases of available-for-sale debt securities	0	(435,807)
Maturities, prepayments and calls of held-to-maturity debt securities	159,502	159,349
Purchases of held-to-maturity debt securities	0	(511,195)
Principal collected on loans	2,167,746	4,530,150
Loan originations	(3,133,352)	(5,984,286)
Net additions to premises and equipment	(36,492)	(16,909)
Proceeds from sale of other real estate owned	179	997
Proceeds from redemption of non-marketable equity securities	628,801	132,667
Purchases of non-marketable equity securities	(558,117)	(160,798)
Proceeds from bank-owned life insurance	1,787	2,217
Investments in variable interest entities	(22,342)	(32,866)
Net cash used in investing activities	(282,874)	(1,402,445)
Financing Activities
Net (decrease) increase in deposits	(210,838)	543,134
Net increase (decrease) in securities sold under agreements to repurchase	553,780	(133,311)
Net (decrease) increase in short-term Federal Home Loan Bank advances	(1,800,000)	705,000
Proceeds from long-term FRB Bank Term Funding advances	2,740,000	0
Net (decrease) increase in other borrowed funds	(4,196)	10,415
Cash dividends paid	(73,485)	(84,414)
Tax withholding payments for stock-based compensation	(1,799)	(1,600)
Net cash provided by financing activities	1,203,462	1,039,224
Net increase (decrease) in cash, cash equivalents and restricted cash	1,270,099	(12,474)
Cash, cash equivalents and restricted cash at beginning of period	401,995	437,686
Cash, cash equivalents and restricted cash at end of period	1,672,094	425,212
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	131,390	19,904
Cash paid during the period for income taxes	17,841	40,917
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Transfer of debt securities from available-for-sale to held-to-maturity	0	2,154,475
Sale and refinancing of other real estate owned	23	0
Transfer of loans to other real estate owned	100	896
Right-of-use assets obtained in exchange for new lease liabilities	1,096	24,023
Dividends declared during the period but not paid	$ 36,873	$ 36,817