Allowance for Loan and Lease Losses - Schedule of Information Regarding the Aging of Past Due Loans, By Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Age analysis of past due loans
Total loans and leases	$ 6,931,694	$ 7,269,553
Past Due Greater Than 90 Days and Accruing	838	11,975
Non-accrual	35,860	38,448
Non-accrual with No Related Allowance	19,341	22,811
Commercial real estate
Age analysis of past due loans
Total loans and leases	2,707,100	2,578,773
Multi-family mortgage
Age analysis of past due loans
Total loans and leases	1,007,168	1,013,432
Construction
Age analysis of past due loans
Total loans and leases	194,743	231,621
Commercial
Age analysis of past due loans
Total loans and leases	739,023	1,131,668
Equipment financing
Age analysis of past due loans
Total loans and leases	1,085,028	1,092,461
Condominium association
Age analysis of past due loans
Total loans and leases	45,635	50,770
Residential mortgage
Age analysis of past due loans
Total loans and leases	789,990	791,317
Home equity
Age analysis of past due loans
Total loans and leases	327,906	346,652
Other consumer
Age analysis of past due loans
Total loans and leases	35,101	32,859
Commercial real estate loans
Age analysis of past due loans
Total loans and leases	3,909,011	3,823,826
Past Due Greater Than 90 Days and Accruing	0	8,486
Non-accrual	10,963	7,153
Non-accrual with No Related Allowance	10,571	6,433
Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	2,707,100	2,578,773
Past Due Greater Than 90 Days and Accruing	0	4,722
Non-accrual	10,963	3,300
Non-accrual with No Related Allowance	10,571	2,580
Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	1,007,168	1,013,432
Past Due Greater Than 90 Days and Accruing	0	0
Non-accrual	0	0
Non-accrual with No Related Allowance	0	0
Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	194,743	231,621
Past Due Greater Than 90 Days and Accruing	0	3,764
Non-accrual	0	3,853
Non-accrual with No Related Allowance	0	3,853
Commercial loans and leases
Age analysis of past due loans
Total loans and leases	1,869,686	2,274,899
Past Due Greater Than 90 Days and Accruing	634	3,486
Non-accrual	20,285	24,571
Non-accrual with No Related Allowance	5,869	10,437
Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	739,023	1,131,668
Past Due Greater Than 90 Days and Accruing	573	3,486
Non-accrual	2,539	7,702
Non-accrual with No Related Allowance	1,549	6,263
Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	1,085,028	1,092,461
Past Due Greater Than 90 Days and Accruing	61	0
Non-accrual	17,655	16,757
Non-accrual with No Related Allowance	4,320	4,062
Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	45,635	50,770
Past Due Greater Than 90 Days and Accruing	0	0
Non-accrual	91	112
Non-accrual with No Related Allowance	0	112
Consumer loans
Age analysis of past due loans
Total loans and leases	1,152,997	1,170,828
Past Due Greater Than 90 Days and Accruing	204	3
Non-accrual	4,612	6,724
Non-accrual with No Related Allowance	2,901	5,941
Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	789,990	791,317
Past Due Greater Than 90 Days and Accruing	203	0
Non-accrual	4,150	5,587
Non-accrual with No Related Allowance	2,729	5,117
Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	327,906	346,652
Past Due Greater Than 90 Days and Accruing	1	3
Non-accrual	461	1,136
Non-accrual with No Related Allowance	172	824
Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	35,101	32,859
Past Due Greater Than 90 Days and Accruing	0	0
Non-accrual	1	1
Non-accrual with No Related Allowance	0	0
Past Due
Age analysis of past due loans
Total loans and leases	40,676	82,574
Past Due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	16,840	46,398
Past Due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	13,137	37,968
Past Due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	3,307	813
Past Due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	396	7,617
Past Due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	18,257	28,129
Past Due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	2,536	9,926
Past Due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	15,665	17,624
Past Due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	56	579
Past Due | Consumer loans
Age analysis of past due loans
Total loans and leases	5,579	8,047
Past Due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	4,882	6,650
Past Due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	691	1,383
Past Due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	6	14
31-60 days past due
Age analysis of past due loans
Total loans and leases	14,013	28,564
31-60 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	5,999	19,107
31-60 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	2,296	18,294
31-60 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	3,307	813
31-60 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	396	0
31-60 days past due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	5,573	6,703
31-60 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	305	451
31-60 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	5,256	5,970
31-60 days past due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	12	282
31-60 days past due | Consumer loans
Age analysis of past due loans
Total loans and leases	2,441	2,754
31-60 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	1,917	2,161
31-60 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	521	580
31-60 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	3	13
61-90 days past due
Age analysis of past due loans
Total loans and leases	2,815	16,129
61-90 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	296	12,402
61-90 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	296	12,402
61-90 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	0	0
61-90 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	0	0
61-90 days past due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	2,461	2,864
61-90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	801	304
61-90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	1,616	2,263
61-90 days past due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	44	297
61-90 days past due | Consumer loans
Age analysis of past due loans
Total loans and leases	58	863
61-90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	0	648
61-90 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	56	215
61-90 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	2	0
Greater than 90 days past due
Age analysis of past due loans
Total loans and leases	23,848	37,881
Greater than 90 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	10,545	14,889
Greater than 90 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	10,545	7,272
Greater than 90 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	0	0
Greater than 90 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	0	7,617
Greater than 90 days past due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	10,223	18,562
Greater than 90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	1,430	9,171
Greater than 90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	8,793	9,391
Greater than 90 days past due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	0	0
Greater than 90 days past due | Consumer loans
Age analysis of past due loans
Total loans and leases	3,080	4,430
Greater than 90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	2,965	3,841
Greater than 90 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	114	588
Greater than 90 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	1	1
Current
Age analysis of past due loans
Total loans and leases	6,891,018	7,186,979
Current | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	3,892,171	3,777,428
Current | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	2,693,963	2,540,805
Current | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	1,003,861	1,012,619
Current | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	194,347	224,004
Current | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	1,851,429	2,246,770
Current | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	736,487	1,121,742
Current | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	1,069,363	1,074,837
Current | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	45,579	50,191
Current | Consumer loans
Age analysis of past due loans
Total loans and leases	1,147,418	1,162,781
Current | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	785,108	784,667
Current | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	327,215	345,269
Current | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	$ 35,095	$ 32,845