Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities
Net income	$ 360,642	$ 298,304	$ 228,860
Adjustments to reconcile net income to net cash provided by operating activities:
Provision/(reversal) for credit losses	14,543	(16,008)	57,500
Provision for losses on other real estate owned	0	17	717
Deferred tax (benefit)/ provision	(2,088)	9,168	(9,486)
Depreciation and amortization	9,958	7,956	7,660
Amortization of right-of-use asset	9,845	8,160	8,852
Change in operating lease liabilities	(4,629)	(2,790)	(2,389)
Net gains on sale and transfers of other real estate owned	(6)	(57)	(4,216)
Net gains on sale of loans	(1)	(357)	(413)
Proceeds from sale of loans	33	5,351	11,098
Originations of loans held for sale	0	(4,994)	(10,685)
Loss on sales or disposal of fixed assets	67	55	45
Amortization of alternative energy partnerships, venture capital and other investments	42,065	45,447	58,131
Net gain on sales and calls of securities	(101)	(853)	(1,695)
Amortization/accretion of security premiums/discount, net	2,465	7,865	8,617
Unrealized loss/(gain) on equity securities	(291)	2,036	1,148
Stock-based compensation and stock issued to officers as compensation	7,832	6,810	6,406
Net change in accrued interest receivable and other assets	(80,411)	(34,196)	(21,247)
Net change in other liabilities	107,467	2,403	(18,948)
Net cash provided by operating activities	467,390	334,317	319,955
Cash Flows from Investing Activities
Purchase of investment securities available-for-sale	(711,707)	(560,140)	(434,165)
Proceeds from repayment, maturity, and call of investment securities available-for-sale	213,936	424,386	734,485
Proceeds from sale of investment securities available-for-sale	0	21,102	117,249
Proceeds from sale of equity securities	553	0	3,112
Purchase of Federal Home Loan Bank stock	(9,776)	0	(840)
Redemption of Federal Home Loan Bank stock	9,776	0	1,680
Net increase in loans	(1,272,268)	(715,862)	(583,136)
Purchase of premises and equipment	(3,390)	(3,728)	(5,778)
Benefits received on bank owned life insurance	4,013	2,752	0
Proceeds from sales of other real estate owned	307	795	4,308
Net increase in investment in affordable housing and alternative energy partnerships	(6,995)	(29,229)	(79,119)
Acquisitions, net of cash acquired	(73,882)	0	0
Net cash used for investing activities	(1,849,433)	(859,924)	(242,204)
Cash Flows from Financing Activities
(Decrease)/increase in deposits	(128,803)	1,949,728	1,417,310
Advances from Federal Home Loan Bank	465,000	50,000	1,450,000
Repayment of Federal Home Loan Bank borrowings	0	(180,000)	(1,970,000)
Cash dividends paid	(100,955)	(99,322)	(98,688)
Purchase of treasury stock	(141,316)	(167,104)	(23,593)
Repayment of short-term borrowings	0	0	(25,683)
Repayment of other borrowings	0	0	(7,663)
Proceeds from shares issued under Dividend Reinvestment Plan	3,720	3,563	9,777
Taxes paid related to net share settlement of RSUs	(2,905)	(2,632)	(1,911)
Net cash provided by financing activities	94,741	1,554,233	749,549
(Decrease)/Increase in cash, cash equivalents, and restricted cash	(1,287,302)	1,028,626	827,300
Cash, cash equivalents, and restricted cash, beginning of the year	2,449,704	1,421,078	593,778
Cash, cash equivalents, and restricted cash, end of the period	1,162,402	2,449,704	1,421,078
Supplemental Cash Flow Information
Interest	105,521	75,486	162,434
Income taxes	96,881	92,691	45,371
Non-cash investing and financing activities:
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax	(105,042)	(11,989)	6,486
Net change in unrealized holding gain/(loss) on cash flow hedge derivatives	5,813	3,614	(3,478)
Transfers to other real estate owned from loans held for investment	0	205	0
Loans transferred from held-for investment to loans held for sale	$ 32	$ 0	$ 0