CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 69,598	$ 92,533	$ 118,664
Adjustments to reconcile net income to net cash provided by operating activities:
Provision expense/(benefit) for credit losses	31,999	11,000	(500)
Net amortization of securities	1,451	2,886	1,939
Change in unamortized net loan origination costs and premiums	764	3,312	(1,918)
Premises and equipment depreciation and amortization expense	8,445	9,576	11,035
Stock-based compensation expense	7,498	7,338	4,170
Accretion of purchase accounting entries, net	(716)	(1,637)	(6,577)
Amortization of intangible assets	4,820	5,134	5,200
Income from cash surrender value of bank-owned life insurance policies	(5,392)	(5,540)	(5,561)
Securities losses/(gains), net	24,544	2,031	787
(Gain) on SBA loan sales	(10,334)	(12,494)	(20,689)
Net change in loans held-for-sale	2,074	5,168	5,775
Loss on disposition of assets	0	0	2,811
Loss on sale of real estate	0	0	6
Amortization of interest in tax-advantaged projects	8,018	3,508	3,444
Gain on sale of business operations and other assets	0	0	(52,942)
Prepayment penalties on repayment of Federal Home Loan Bank advances	0	0	862
Net change in other	14,387	(12,076)	18,282
Net cash provided by operating activities	157,156	110,739	84,788
Cash flows from investing activities:
Net decrease in trading security	860	818	776
Proceeds from sales of marketable equity securities	0	0	2,880
Purchases of securities available for sale	(44,586)	(478,940)	(804,616)
Proceeds from sales of securities available for sale	267,199	149,994	0
Proceeds from maturities, calls, and prepayments of securities available for sale	201,624	548,423	575,538
Purchases of securities held to maturity	(700)	(807)	(219,470)
Proceeds from maturities, calls, and prepayments of securities held to maturity	39,193	51,961	46,061
Net change in loans	(716,591)	(1,546,518)	1,283,210
Net change in Mid-Atlantic region loans held for sale	0	0	50,914
Proceeds from surrender of bank-owned life insurance	2,002	2,311	2,566
Purchase of Federal Home Loan Bank stock	(494,159)	(124,331)	0
Proceeds from sales of Federal Home Loan Bank stock	478,689	127,912	24,078
Net investment in limited partnership tax credits	(16,172)	(14,537)	(2,878)
Purchase of premises and equipment, net	(1,820)	(1,495)	(1,606)
Proceeds from sales of seasoned commercial loan portfolios	0	24,323	16,417
Proceeds from sales of other real estate owned	0	0	187
Cash outflows from sale of business operations and other assets	0	0	(352,814)
Net cash (used)/provided by investing activities	(284,461)	(1,260,886)	621,243
Cash flows from financing activities:
Net increase in deposits	306,115	258,316	(154,052)
Net change in Mid-Atlantic region deposits held for sale	0	0	20,953
Proceeds from Federal Home Loan Bank advances and other borrowings	10,450,979	51,275	0
Repayments of Federal Home Loan Bank advances and other borrowings	(10,070,200)	(60,196)	(462,059)
Proceeds from issuance of subordinated debt	0	98,032	0
Repayment from calling of subordinated debt	0	(75,000)	0
Purchase of treasury stock	(23,844)	(124,519)	(68,712)
Exercise of stock options	0	270	417
Common and preferred stock cash dividends paid	(31,707)	(24,527)	(24,553)
Settlement of derivative contracts with financial institution counterparties	13,851	84,044	51,907
Net cash provided/(used) by financing activities	645,194	207,695	(636,099)
Net change in cash and cash equivalents	517,889	(942,452)	69,932
Cash and cash equivalents at beginning of year	685,355	1,627,807	1,557,875
Cash and cash equivalents at end of year	1,203,244	685,355	1,627,807
Supplemental cash flow information:
Interest paid on deposits	148,313	32,782	29,606
Interest paid on borrowed funds	46,584	9,043	11,385
Income taxes paid, net	12,307	28,439	14,816
Other net comprehensive income/(loss)	38,036	(177,809)	(34,114)
Premises and equipment reclassified to held-for-sale	8,714	1,380	4,577
Reclassifications of loans to loans held for sale	0	3,369	11,660
Loans held-for-sale reclassified to portfolio loans, net	0	606	0
Premium payable on cash flow hedges	0	2,296	0
Discontinued Operations, Held-for-sale | Mid-Atlantic Branch Sale
Supplemental cash flow information:
Loans held-for-sale reclassified to portfolio loans, net	0	0	29,418
Mid-Atlantic deposits held-for-sale reclassified to deposits, net	0	0	7,197
Retained earnings
Cash flows from operating activities:
Net income	69,598	92,533	118,664
Impact of ASC 326 adoption | Retained earnings
Supplemental cash flow information:
Impact to retained earnings from adoption of ASU 2022-02	$ 401	$ 0	$ 0