Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 108,113	$ 99,915	$ 101,340	$ 98,576
Provision for credit losses on loans	8,611	1,192	9,701	495
Charge-offs	(12,222)	(7,678)	(16,681)	(8,661)
Recoveries	1,255	4,666	10,829	7,685
Net (Charge-offs)/Recoveries	(10,967)	(3,012)	(5,852)	(976)
Balance at End of Period	105,757	98,095	105,757	98,095
Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			568
Commercial Loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	40,426	48,903	41,428	50,700
Provision for credit losses on loans	(544)	(3,678)	(1,555)	(5,475)
Charge-offs	0	(199)	0	(199)
Recoveries	955	288	964	288
Net (Charge-offs)/Recoveries	955	89	964	89
Balance at End of Period	40,837	45,314	40,837	45,314
Commercial Loans | Commercial real estate | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			0
Commercial Loans | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	31,297	22,237	25,710	19,727
Provision for credit losses on loans	8,832	948	8,356	768
Charge-offs	(11,808)	(5,797)	(15,220)	(5,798)
Recoveries	7	4,138	9,407	6,829
Net (Charge-offs)/Recoveries	(11,801)	(1,659)	(5,813)	1,031
Balance at End of Period	28,328	21,526	28,328	21,526
Commercial Loans | Commercial and industrial | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			75
Commercial Loans | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	6,893	5,329	6,264	5,355
Provision for credit losses on loans	(154)	1,254	258	1,227
Charge-offs	0	0	0	0
Recoveries	0	0	2	1
Net (Charge-offs)/Recoveries	0	0	2	1
Balance at End of Period	6,739	6,583	6,739	6,583
Commercial Loans | Commercial construction | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			215
Commercial Loans | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	13,680	11,497	12,547	11,338
Provision for credit losses on loans	(157)	1,668	1,340	2,207
Charge-offs	(10)	(1,141)	(662)	(1,746)
Recoveries	103	133	140	358
Net (Charge-offs)/Recoveries	93	(1,008)	(522)	(1,388)
Balance at End of Period	13,616	12,157	13,616	12,157
Commercial Loans | Business banking | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			251
Consumer Loans | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	12,855	9,118	12,105	8,733
Provision for credit losses on loans	550	582	1,038	1,010
Charge-offs	(40)	(60)	(117)	(138)
Recoveries	53	33	114	68
Net (Charge-offs)/Recoveries	13	(27)	(3)	(70)
Balance at End of Period	13,418	9,673	13,418	9,673
Consumer Loans | Consumer real estate | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			278
Consumer Loans | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,962	2,831	3,286	2,723
Provision for credit losses on loans	84	418	264	758
Charge-offs	(364)	(481)	(682)	(780)
Recoveries	137	74	202	141
Net (Charge-offs)/Recoveries	(227)	(407)	(480)	(639)
Balance at End of Period	$ 2,819	$ 2,842	2,819	$ 2,842
Consumer Loans | Other consumer | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ (251)