Allowance for Loan and Lease Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Age analysis of past due loans
Total loans and leases	$ 7,020,275	$ 7,269,553
Past Due Greater Than 90 Days and Accruing	3,154	11,975
Non-accrual	34,216	38,448
Non-accrual with No Related Allowance	22,202	22,811
Commercial real estate
Age analysis of past due loans
Total loans and leases	2,646,104	2,578,773
Multi-family mortgage
Age analysis of past due loans
Total loans and leases	967,891	1,013,432
Construction
Age analysis of past due loans
Total loans and leases	201,586	231,621
Commercial
Age analysis of past due loans
Total loans and leases	918,345	1,131,668
Equipment financing
Age analysis of past due loans
Total loans and leases	1,074,088	1,092,461
Condominium association
Age analysis of past due loans
Total loans and leases	46,418	50,770
Residential mortgage
Age analysis of past due loans
Total loans and leases	799,027	791,317
Home equity
Age analysis of past due loans
Total loans and leases	331,038	346,652
Other consumer
Age analysis of past due loans
Total loans and leases	35,778	32,859
Commercial real estate loans
Age analysis of past due loans
Total loans and leases	3,815,581	3,823,826
Past Due Greater Than 90 Days and Accruing	0	8,486
Non-accrual	11,657	7,153
Non-accrual with No Related Allowance	11,452	6,433
Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	2,646,104	2,578,773
Past Due Greater Than 90 Days and Accruing	0	4,722
Non-accrual	11,657	3,300
Non-accrual with No Related Allowance	11,452	2,580
Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	967,891	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	201,586	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	2,038,851	2,274,899
Past Due Greater Than 90 Days and Accruing	2,850	3,486
Non-accrual	18,176	24,571
Non-accrual with No Related Allowance	7,053	10,437
Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	918,345	1,131,668
Past Due Greater Than 90 Days and Accruing	0	3,486
Non-accrual	3,207	7,702
Non-accrual with No Related Allowance	1,723	6,263
Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	1,074,088	1,092,461
Past Due Greater Than 90 Days and Accruing	2,850	0
Non-accrual	14,872	16,757
Non-accrual with No Related Allowance	5,330	4,062
Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	46,418	50,770
Past Due Greater Than 90 Days and Accruing	0	0
Non-accrual	97	112
Non-accrual with No Related Allowance	0	112
Consumer loans
Age analysis of past due loans
Total loans and leases	1,165,843	1,170,828
Past Due Greater Than 90 Days and Accruing	304	3
Non-accrual	4,383	6,724
Non-accrual with No Related Allowance	3,697	5,941
Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	799,027	791,317
Past Due Greater Than 90 Days and Accruing	301	0
Non-accrual	3,638	5,587
Non-accrual with No Related Allowance	3,185	5,117
Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	331,038	346,652
Past Due Greater Than 90 Days and Accruing	3	3
Non-accrual	744	1,136
Non-accrual with No Related Allowance	512	824
Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	35,778	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	42,998	82,574
Past Due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	16,934	46,398
Past Due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	13,899	37,968
Past Due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	3,035	813
Past Due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	0	7,617
Past Due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	19,865	28,129
Past Due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	2,096	9,926
Past Due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	17,231	17,624
Past Due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	538	579
Past Due | Consumer loans
Age analysis of past due loans
Total loans and leases	6,199	8,047
Past Due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	5,298	6,650
Past Due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	893	1,383
Past Due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	8	14
31-60 days past due
Age analysis of past due loans
Total loans and leases	10,152	28,564
31-60 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	4,192	19,107
31-60 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	1,157	18,294
31-60 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	3,035	813
31-60 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	0	0
31-60 days past due | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	4,520	6,703
31-60 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	153	451
31-60 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	3,914	5,970
31-60 days past due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	453	282
31-60 days past due | Consumer loans
Age analysis of past due loans
Total loans and leases	1,440	2,754
31-60 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	1,075	2,161
31-60 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	363	580
31-60 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	2	13
61-90 days past due
Age analysis of past due loans
Total loans and leases	5,938	16,129
61-90 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	1,517	12,402
61-90 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	1,517	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	3,297	2,864
61-90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	761	304
61-90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	2,451	2,263
61-90 days past due | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	85	297
61-90 days past due | Consumer loans
Age analysis of past due loans
Total loans and leases	1,124	863
61-90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	1,119	648
61-90 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	0	215
61-90 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	5	0
Greater than 90 days past due
Age analysis of past due loans
Total loans and leases	26,908	37,881
Greater than 90 days past due | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	11,225	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	11,225	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	12,048	18,562
Greater than 90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	1,182	9,171
Greater than 90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	10,866	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	3,635	4,430
Greater than 90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	3,104	3,841
Greater than 90 days past due | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	530	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	6,977,277	7,186,979
Current | Commercial real estate loans
Age analysis of past due loans
Total loans and leases	3,798,647	3,777,428
Current | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total loans and leases	2,632,205	2,540,805
Current | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total loans and leases	964,856	1,012,619
Current | Commercial real estate loans | Construction
Age analysis of past due loans
Total loans and leases	201,586	224,004
Current | Commercial loans and leases
Age analysis of past due loans
Total loans and leases	2,018,986	2,246,770
Current | Commercial loans and leases | Commercial
Age analysis of past due loans
Total loans and leases	916,249	1,121,742
Current | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total loans and leases	1,056,857	1,074,837
Current | Commercial loans and leases | Condominium association
Age analysis of past due loans
Total loans and leases	45,880	50,191
Current | Consumer loans
Age analysis of past due loans
Total loans and leases	1,159,644	1,162,781
Current | Consumer loans | Residential mortgage
Age analysis of past due loans
Total loans and leases	793,729	784,667
Current | Consumer loans | Home equity
Age analysis of past due loans
Total loans and leases	330,145	345,269
Current | Consumer loans | Other consumer
Age analysis of past due loans
Total loans and leases	$ 35,770	$ 32,845