CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES:
Net income	$ 101,237	$ 40,423
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation	8,709	9,147
Deferred income/expense and capitalized servicing rights, net of amortization	(21,421)	(3,870)
Amortization of core deposit intangibles	3,422	4,003
Gain on sale of securities, net	(562)	(171)
Net change in valuation of financial instruments carried at fair value	(117)	2,397
Dividend Income Reinvested, Equity Securities, Operating	0	(124)
(Increase) decrease in deferred taxes	3,960	(12,479)
Increase (decrease) in current taxes payable	365	(1,136)
Stock-based compensation	4,651	4,355
Net change in cash surrender value of BOLI	(2,247)	(2,443)
Gain on sale of loans, excluding capitalized servicing rights	(14,904)	(20,594)
(Gain) loss on disposal of real estate held for sale and property and equipment, net	(1,765)	214
(Recapture) provision for credit losses	(19,507)	52,093
Origination of loans held for sale	(504,319)	(668,327)
Proceeds from sales of loans held for sale	691,277	640,668
Net change in:
Other assets	9,357	(59,724)
Other liabilities	69,508	6,347
Net cash provided from operating activities	319,724	15,737
INVESTING ACTIVITIES:
Purchases of securities—available-for-sale	(1,875,578)	(348,416)
Principal repayments and maturities of securities—available-for-sale	826,609	187,596
Proceeds from sales of securities—available-for-sale	51,495	50,935
Purchases of securities—held-to-maturity	(52,440)	(215,780)
Principal repayments and maturities of securities—held-to-maturity	17,142	9,409
Purchases of equity securities	(4,750)	(339,928)
Proceeds from sales of equity securities	4,796	0
Loan repayments (originations), net	209,844	(982,018)
Purchases of loans and participating interest in loans	(33)	(16)
Proceeds from sales of other loans	31,297	8,454
Purchases of property and equipment	(5,198)	(6,790)
Proceeds from sale of real estate held for sale and sale of other property	7,255	2,154
Proceeds from FHLB stock repurchase program	2,358	52,164
Purchase of FHLB stock	0	(40,185)
Payments for Securities Purchased under Agreements to Resell	(300,000)	0
Other	1,334	3,964
Net cash used in investing activities	(1,085,869)	(1,618,457)
FINANCING ACTIVITIES:
Increase in deposits, net	1,069,412	1,967,639
Repayment of long term FHLB advances	(50,000)	0
Repayment of overnight and short term FHLB advances, net	0	(300,000)
Increase in other borrowings, net	52,950	47,609
Proceeds from Issuance of Subordinated Long-term Debt	0	98,140
Cash dividends paid	(29,393)	(65,230)
Taxes paid related to net share settlement of equity awards	3,197	1,424
Cash paid for the repurchase of common stock	39,879	31,775
Net cash provided from financing activities	999,893	1,714,959
NET CHANGE IN CASH AND CASH EQUIVALENTS	233,748	112,239
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,234,183	307,735
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,467,931	419,974
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest paid in cash	13,339	22,485
Tax refunds received	15,975	10,466
NON-CASH INVESTING AND FINANCING TRANSACTIONS:
Transfer of loans to real estate owned and other repossessed assets	423	1,588
Dividends Payable	$ 1,011	$ 568