Consolidated Statements of Cash Flows - (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows From Operating Activities:
Net Income	$ 98,737	$ 135,071
Adjustments to reconcile Net Income to net cash provided by operating activities:
Provision for (reversal of) credit losses	730	(14,409)
Provision for (reversal of) credit losses for unfunded commitments	1,316	(487)
Depreciation and amortization	2,483	4,795
Gain on sale of loans	(3,168)	(11,988)
Gain on mortgage servicing rights	(872)	0
Securities premium amortization, net	7,191	3,152
Origination of loans held for sale	(264,765)	(929,090)
Proceeds from sale of loans held for sale	305,764	975,870
Deferred income tax expense	0	0
Net gain on sale of other real estate owned	(107)	(148)
Net loss (gain) on sale of investment securities	172	(2,058)
Net increase in cash surrender value of BOLI	(1,889)	(1,429)
Net tax expense from stock-based compensation	0	0
Stock-based compensation expense	7,587	5,814
Increase in other assets	(19,055)	(29,667)
Decrease in other liabilities	5,503	89,348
Net Cash Provided by Operating Activities	139,627	224,774
Investment securities available-for-sale:
Purchases	(414,935)	(1,059,189)
Proceeds from maturities	182,767	233,366
Proceeds from sale/call	6,225	164,569
Investment securities held-to-maturity:
Purchases	(290,740)	0
Proceeds from maturities	82,163	0
Proceeds from call	19,944	0
(Purchase of) proceeds from sale of Federal Reserve and Federal Home Loan Bank stock	(8,158)	6,011
Sale of Federal Reserve and Federal Home Loan Bank stock	0	0
Proceeds from sale of SBA PPP loans	0	170,154
Net (increase) decrease in loans	(239,089)	727,021
Proceeds from sale of OREO	241	0
Net change in premises and equipment	(1,518)	(4,973)
Net Cash (Used in) Provided by Investing Activities	(663,100)	236,959
Cash Flows From Financing Activities:
Increase (decrease) in deposits	(1,218,190)	479,285
Increase (decrease) in customer repurchase agreements	(2,453)	2,675
Proceeds from short-term borrowings	215,000	0
Repayment of long-term borrowings	0	(200,000)
Proceeds from issuance of common stock	0	327
Proceeds from employee stock purchase plan	558	0
Proceeds from exercise of equity compensation plans	97	0
Common stock repurchased	0	(677)
Cash dividends paid	(41,586)	(31,914)
Net Cash (Used in) Provided by Financing Activities	(1,046,574)	249,696
Net (Decrease) Increase in Cash and Cash Equivalents	(1,570,047)	711,429
Cash and Cash Equivalents at Beginning of Period	1,714,222	1,789,055
Cash and Cash Equivalents at End of Period	144,175	2,500,484
Supplemental Cash Flows Information:
Interest paid	49,273	36,831
Income taxes paid	16,150	42,986
Non-Cash Activities
Initial recognition of operating lease right-of-use assets	0	(10,168)
Transfers of investment securities from available-for-sale to held-to-maturity	922,795	0
Transfers from loans to other real estate owned	475	148
Change in fair value of investment securities available-for-sale	973,655	24,495
Change in fair value of cash flow hedges	$ 0	$ (516)