CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 79,920	$ 212,180	$ 219,923
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,385	24,479	26,894
Provision (benefit) for credit losses	21,707	15,370	(17,575)
Net amortization of premium on securities	29,671	59,454	52,145
Provision (benefit) for deferred taxes	(9,196)	(3,887)	11,543
Securities losses (gains), net	141,539	425	(5,910)
Unrealized loss (gain) on equity securities, net	(240)	622	(58)
Stock based compensation	9,449	8,162	8,743
Loss (gain) on sales/valuations of assets, net	(77)	1,998	2,222
Loans originated for sale	(136,734)	(284,324)	(466,071)
Proceeds on sales of loans held for sale	160,705	308,294	521,463
Net gains on sales of loans held for sale	(3,856)	(7,607)	(19,083)
Increase in accrued interest receivable	(11,294)	(17,530)	(1,590)
Increase in prepaid expenses	(1,183)	(1,580)	(1,102)
Increase (decrease) in accrued interest payable	45,987	3,737	(497)
Capitalization of servicing rights	(24)	(1,425)	(1,522)
Valuation adjustment on servicing rights	0	(1,658)	(1,088)
Net excess tax (expense) benefit from stock-based compensation	(123)	131	312
Income from fair value hedge activity	(4,021)	0	0
Other, net	(62,303)	71,167	(2,712)
NET CASH PROVIDED BY OPERATING ACTIVITIES	280,312	388,008	326,037
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of time deposits in other financial institutions	0	0	(10)
Proceeds from the sale of securities available for sale	1,196,586	1,048,525	1,475,598
Proceeds from the sale of securities held to maturity	0	2,337	0
Proceeds from the sale, maturity of and principal paydowns on other investments	42,875	22,359	4,858
Proceeds from the maturity of and principal paydowns on securities available for sale	604,088	903,514	1,059,292
Proceeds from the maturity of and principal paydowns on securities held to maturity	2,427	6,082	5,659
Proceeds from the maturity of time deposits in other financial institutions	500	1,154	245
Purchase of securities available for sale	(337,667)	(2,226,881)	(4,094,661)
Purchase of other investments	(59,747)	(12,992)	(12,172)
Net (increase) decrease in loans	(661,445)	(1,506,338)	50,437
Purchase of bank owned life insurance policies	(320)	(283)	(288)
Proceeds from bank owned life insurance policies	0	966	0
Proceeds from sale of mortgage servicing rights	6,714	0	0
Capital expenditures and investments	(7,060)	(14,804)	(17,203)
Net cash expended in divestitures	0	(50,616)	(15,682)
Proceeds from sale of premises, furniture and equipment	9,254	10,872	10,489
Proceeds on sale of OREO and other repossessed assets	5,990	3,062	8,338
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	802,195	(1,813,043)	(1,525,100)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in demand deposits	(1,201,036)	(206,366)	813,600
Net increase (decrease) in savings accounts	(1,188,794)	566,033	893,569
Net increase (decrease) in time deposit accounts	1,078,535	799,938	(242,321)
Net increase (decrease) in borrowings	(225,048)	194,520	(36,275)
Proceeds from short term FHLB advances	1,295,488	286,000	141,700
Repayments of short term FHLB advances	(824,302)	(236,000)	(141,700)
Proceeds from other borrowings	0	0	147,614
Repayments of other borrowings	(740)	(228)	(233,794)
Proceeds from issuance of common stock	2,467	2,875	2,925
Dividends paid	(59,151)	(54,249)	(48,559)
NET CASH PROVIDED (USED) BY FINANCING ACTIVITIES	(1,122,581)	1,352,523	1,296,759
Net increase (decrease) in cash and cash equivalents	(40,074)	(72,512)	97,696
Cash and cash equivalents at beginning of year	363,087	435,599	337,903
CASH AND CASH EQUIVALENTS AT END OF PERIOD	323,013	363,087	435,599
Supplemental disclosures:
Cash paid for income/franchise taxes	48,624	37,782	49,914
Cash paid for interest	306,572	72,683	28,703
Loans transferred to OREO	13,181	9,423	2,807
Transfer of premises from premises, furniture and equipment held for sale to premises, furniture and equipment, net	5,824	0	396
Transfer of premises from premises, furniture and equipment, net to premises, furniture and equipment held for sale	6,786	5,188	12,662
Securities transferred from available for sale to held to maturity	0	934,538	0
Dividends declared, not paid	$ 2,205	$ 2,013	$ 2,013