onsolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Net income	$ 298,304	$ 228,860	$ 279,135
Adjustments to reconcile net income to net cash provided by operating activities:
(Reversal)/provision for credit losses	(16,008)	57,500	(7,000)
Provision for losses on other real estate owned	17	717	681
Deferred tax (benefit)/ provision	9,168	(9,486)	9,825
Depreciation and amortization	7,956	7,660	6,756
Amortization of right-of-use asset	8,160	8,852	8,366
Change in operating lease liabilities	(2,790)	(2,389)	(7,157)
Net gains on sale and transfers of other real estate owned	(57)	(4,216)	(212)
Net gains on sale of loans	(357)	(413)	(804)
Proceeds from sale of loans	5,351	11,098	75,257
Originations of loans held for sale	(4,994)	(10,685)	(2,241)
Loss on sales or disposal of fixed assets	55	45	14
Amortization of alternative energy partnerships, venture capital and other investments	45,447	58,131	39,898
Net gain on sales and calls of securities	(853)	(1,695)	(211)
Amortization/accretion of security premiums/discount, net	7,865	8,617	3,834
Unrealized loss/(gain) on equity securities	2,036	1,148	(5,736)
Stock-based compensation and stock issued to officers as compensation	6,810	6,406	7,350
Net change in accrued interest receivable and other assets	(34,196)	(21,247)	6,163
Net change in other liabilities	2,403	(18,948)	21,061
Net cash provided by operating activities	334,317	319,955	434,979
Cash Flows from Investing Activities
Purchase of investment securities available-for-sale	(560,140)	(434,165)	(770,206)
Proceeds from repayment, maturity, and call of investment securities available-for-sale	424,386	734,485	296,721
Proceeds from sale of investment securities available-for-sale	21,102	117,249	293,849
Proceeds from sale of equity securities	0	3,112	2,829
Purchase of Federal Home Loan Bank stock	0	(840)	(1,815)
Redemption of Federal Home Loan Bank stock	0	1,680	975
Net increase in loans	(715,862)	(583,136)	(1,147,019)
Purchase of premises and equipment	(3,728)	(5,778)	(7,133)
Benefits received on bank owned life insurance	2,752	0	0
Proceeds from sales of other real estate owned	795	4,308	2,822
Net increase in investment in affordable housing and alternative energy partnerships	(29,229)	(79,119)	(52,697)
Net cash used for investing activities	(859,924)	(242,204)	(1,381,674)
Cash Flows from Financing Activities
Net increase in deposits	1,949,728	1,417,310	989,942
Advances from Federal Home Loan Bank	50,000	1,450,000	4,355,000
Repayment of Federal Home Loan Bank borrowings	(180,000)	(1,970,000)	(4,215,000)
Cash dividends paid	(99,322)	(98,688)	(99,131)
Purchase of treasury stock	(167,104)	(23,593)	(36,301)
Proceeds from issuance of short-term borrowings	0	0	25,683
Repayment of short-term borrowings	0	(25,683)	0
Repayment of other borrowings	0	(7,663)	(81,065)
Proceeds from shares issued under Dividend Reinvestment Plan	3,563	9,777	3,366
Taxes paid related to net share settlement of RSUs	(2,632)	(1,911)	(2,311)
Net cash provided by financing activities	1,554,233	749,549	940,183
Increase/(Decrease) in cash, cash equivalents, and restricted cash	1,028,626	827,300	(6,512)
Cash, cash equivalents, and restricted cash, beginning of the year	1,421,078	593,778	600,290
Cash, cash equivalents, and restricted cash, end of the period	2,449,704	1,421,078	593,778
Supplemental Cash Flow Information
Interest	75,486	162,434	182,527
Income taxes	92,691	45,371	61,548
Non-cash investing and financing activities:
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax	(11,989)	6,486	23,479
Net change in unrealized holding gain/(loss) on cash flow hedge derivatives	3,614	(3,478)	(3,171)
Transfers to other real estate owned from loans held for investment	205	0	860
Loans transferred to loans held for sale	$ 0	$ 0	$ 75,285