Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 98,576	$ 117,612
Provision for credit losses on loans	5,359	15,494
Charge-offs	(11,617)	(37,524)
Recoveries	9,022	2,994
Net (Charge-offs)/Recoveries	(2,595)	(34,530)
Balance at End of Period	101,340	98,576
Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	50,700	65,656
Provision for credit losses on loans	(9,064)	(2,569)
Charge-offs	(827)	(13,444)
Recoveries	619	1,057
Net (Charge-offs)/Recoveries	(208)	(12,387)
Balance at End of Period	41,428	50,700
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	19,727	16,100
Provision for credit losses on loans	4,797	23,746
Charge-offs	(5,797)	(20,923)
Recoveries	6,983	804
Net (Charge-offs)/Recoveries	1,186	(20,119)
Balance at End of Period	25,710	19,727
Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	5,355	7,239
Provision for credit losses on loans	908	(1,842)
Charge-offs	0	(56)
Recoveries	1	14
Net (Charge-offs)/Recoveries	1	(42)
Balance at End of Period	6,264	5,355
Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	11,338	15,917
Provision for credit losses on loans	3,644	(3,159)
Charge-offs	(3,314)	(1,580)
Recoveries	879	160
Net (Charge-offs)/Recoveries	(2,435)	(1,420)
Balance at End of Period	12,547	11,338
Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,733	10,014
Provision for credit losses on loans	3,536	(1,020)
Charge-offs	(304)	(569)
Recoveries	140	308
Net (Charge-offs)/Recoveries	(164)	(261)
Balance at End of Period	12,105	8,733
Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,723	2,686
Provision for credit losses on loans	1,538	338
Charge-offs	(1,375)	(952)
Recoveries	400	651
Net (Charge-offs)/Recoveries	(975)	(301)
Balance at End of Period	$ 3,286	$ 2,723