CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 122,844	$ 166,299	$ 235,107
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	22,006	11,906	14,522
Provision/ (credit) for credit losses - loans	(17,561)	34,372	(45,556)
Share based compensation expense	7,631	7,887	5,299
Gain on disposal of assets	0	(16,516)	0
Deferred income tax / (benefit)	5,891	(9,491)	12,255
Origination of loans held for sale	(367,910)	(363,204)	(1,385,664)
Proceeds from sales of loans held for sale	374,468	398,688	1,456,110
Gains on sales of loans held for sale	(5,688)	(7,781)	(31,561)
(Gains)/ losses on sale of other real estate owned	(66)	86	241
Investment securities (gains)/ losses	0	345	(212)
Tax benefit associated with share based compensation	295	(646)	(1,850)
Net (increase)/ decrease in accrued interest receivable	(5,411)	(6,823)	12,082
Net increase in other assets	(6,490)	(4,776)	(35,498)
Net increase/ (decrease) accrued expenses and other liabilities	6,176	9,686	(20,771)
Other, net	1,630	(3,710)	1,894
Net cash provided by operating activities	137,815	216,322	216,398
Investing activities:
Sales/ (purchases) of other investments	(6,388)	(28,052)
Sales/ (purchases) of other investments			24,594
Purchases of investments available-for-sale	(17,687)	(469,792)	(933,491)
Proceeds from sales of investment available-for-sale	0	18,087	400,567
Proceeds from maturities, calls and principal payments of investments available-for-sale	160,637	240,217	369,678
Proceeds from maturities, calls and principal payments of investments held-to-maturity	24,675	31,759	0
Net (increase)/ decrease in loans	30,971	(1,420,983)	457,724
Proceeds from the sales of other real estate owned	712	335	680
Proceeds from sale of business activity, net	0	23,822	0
Expenditures for premises and equipment	(13,982)	(14,589)	(11,491)
Net cash provided by/ (used in) investing activities	178,938	(1,619,196)	308,261
Financing activities:
Net increase in deposits	44,411	330,721	595,942
Net increase/ (decrease) in retail repurchase agreements, federal funds purchased and Federal Reserve Bank borrowings	53,065	180,881	(402,071)
Proceeds from FHLB advances	2,030,000	2,526,625	0
Repayment of FHLB advances	(2,030,000)	(1,976,625)	(379,075)
Proceeds from issuance of subordinated debt	0	200,000	0
Retirement of subordinated debt	0	0	(53,000)
Proceeds from issuance of common stock	2,417	2,192	5,758
Stock tendered for payment of withholding taxes	(1,821)	(2,353)	(1,577)
Repurchase of common stock	0	(24,987)	(107,268)
Dividends paid	(61,159)	(61,368)	(60,351)
Net cash provided by/ (used in) financing activities	36,913	1,175,086	(401,642)
Net increase/ (decrease) in cash and cash equivalents	353,666	(227,788)	123,017
Cash and cash equivalents at beginning of year	192,232	420,020	297,003
Cash and cash equivalents at end of year	545,898	192,232	420,020
Supplemental Disclosures:
Interest payments	263,473	62,240	37,847
Income tax payments, net of refunds of $0, $966 and $2,673 in 2023, 2022 and 2021	35,945	62,098	71,908
Transfers from loans to other real estate owned	$ 0	$ 0	$ 257