Consolidated Statements of Cash Flows - (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities:
Net Income	$ 61,440	$ 91,462
Adjustments to reconcile Net Income to net cash provided by operating activities:
Reversal of credit losses	(2,292)	(6,206)
Provision for (reversal of) credit losses for unfunded commitments	542	(1,203)
Depreciation and amortization	1,657	2,263
Gain on sale of loans	(2,347)	(8,656)
Gain on mortgage servicing rights	(918)	(139)
Securities premium amortization, net	5,009	5,486
Origination of loans held for sale	(206,495)	(713,771)
Proceeds from sale of loans held for sale	242,246	754,683
Increase (Decrease) in Deferred Income Taxes	0	144
Net gain on sale of other real estate owned	(93)	0
Net loss (gain) on sale of investment securities	176	(539)
Net increase in cash surrender value of BOLI	(1,258)	(787)
Stock-based compensation expense	5,314	3,823
Net tax expense from stock-based compensation	1,615	0
Increase in other assets	(3,002)	(13,561)
Increase (decrease) in other liabilities	22,563	(1,111)
Net Cash Provided by Operating Activities	124,157	111,888
Investment securities available-for-sale:
Purchases	(383,795)	(768,909)
Proceeds from maturities	128,889	166,731
Proceeds from sale/call	6,225	52,022
Investment securities held-to-maturity:
Purchases	(283,890)	0
Proceeds from maturities	64,105	0
Purchases of Federal Reserve and Federal Home Loan Bank stock	(149)	(98)
Sale of Federal Reserve and Federal Home Loan Bank stock	312	6,169
Proceeds from sale of SBA PPP loans	0	169,778
Net (increase) decrease in loans	(88,872)	320,029
Proceeds from sale of OREO	241	0
Net change in premises and equipment	(681)	(4,350)
Net Cash Used in Investing Activities	(557,615)	(58,628)
Cash Flows From Financing Activities:
Decrease in deposits	(809,922)	(170,156)
Increase (decrease) in customer repurchase agreements	2,621	(7,076)
Decrease in short-term borrowings	(20,000)	0
Repayment of long-term borrowings	0	(50,000)
Proceeds from issuance of common stock	0	327
Proceeds from employee stock purchase plan	369	0
Proceeds from exercise of equity compensation plans	97	0
Common stock repurchased	0	(62)
Tax equivalent shares withheld on exercise of stock-based compensation plans	(1,615)	0
Cash dividends paid	(27,148)	(19,126)
Net Cash Used in Financing Activities	(855,598)	(246,093)
Net Decrease in Cash and Cash Equivalents	(1,289,056)	(192,833)
Cash and Cash Equivalents at Beginning of Period	1,714,222	1,789,055
Cash and Cash Equivalents at End of Period	425,166	1,596,222
Supplemental Cash Flows Information:
Interest paid	20,586	22,535
Income taxes paid	5,650	30,986
Non-Cash Activities
Initial recognition of operating lease right-of-use assets	0	7,339
Change in fair value of investment securities available-for-sale	$ 922,795	$ 0

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