Loans and Leases (Summary of Loan and Lease Balances and Weighted Average Coupon Rates) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 6,449,687	$ 5,909,109
Originated, Weighted Average Coupon (as a percent)	4.89%	5.13%
Acquired loans	$ 288,129	$ 394,407
Acquired, Weighted Average Coupon (as a percent)	4.67%	4.83%
Total loans and leases	$ 6,737,816	$ 6,303,516
Total, Weighted Average Coupon (as a percent)	4.88%	5.11%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 2,491,011	$ 2,330,725
Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	932,163	847,711
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	246,048	173,300
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	729,502	736,418
Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,052,408	982,089
Condominium association
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	56,838	50,451
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	814,245	782,968
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	376,819	376,484
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	38,782	23,370
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 3,535,534	$ 3,159,855
Originated, Weighted Average Coupon (as a percent)	4.33%	4.63%
Acquired loans	$ 133,688	$ 191,881
Acquired, Weighted Average Coupon (as a percent)	4.73%	4.85%
Total loans and leases	$ 3,669,222	$ 3,351,736
Total, Weighted Average Coupon (as a percent)	4.34%	4.64%
Commercial real estate loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 2,400,037	$ 2,208,904
Originated, Weighted Average Coupon (as a percent)	4.32%	4.61%
Acquired loans	$ 90,974	$ 121,821
Acquired, Weighted Average Coupon (as a percent)	4.63%	4.62%
Total loans and leases	$ 2,491,011	$ 2,330,725
Total, Weighted Average Coupon (as a percent)	4.33%	4.61%
Commercial real estate loans | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 896,482	$ 799,813
Originated, Weighted Average Coupon (as a percent)	4.18%	4.51%
Acquired loans	$ 35,681	$ 47,898
Acquired, Weighted Average Coupon (as a percent)	4.59%	4.58%
Total loans and leases	$ 932,163	$ 847,711
Total, Weighted Average Coupon (as a percent)	4.20%	4.51%
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 239,015	$ 151,138
Originated, Weighted Average Coupon (as a percent)	5.04%	5.62%
Acquired loans	$ 7,033	$ 22,162
Acquired, Weighted Average Coupon (as a percent)	6.73%	6.74%
Total loans and leases	$ 246,048	$ 173,300
Total, Weighted Average Coupon (as a percent)	5.09%	5.76%
Commercial loans and leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 1,820,710	$ 1,741,921
Originated, Weighted Average Coupon (as a percent)	6.42%	6.44%
Acquired loans	$ 18,038	$ 27,037
Acquired, Weighted Average Coupon (as a percent)	5.25%	5.46%
Total loans and leases	$ 1,838,748	$ 1,768,958
Total, Weighted Average Coupon (as a percent)	6.41%	6.43%
Commercial loans and leases | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 713,875	$ 712,630
Originated, Weighted Average Coupon (as a percent)	4.65%	4.96%
Acquired loans	$ 15,627	$ 23,788
Acquired, Weighted Average Coupon (as a percent)	5.14%	5.39%
Total loans and leases	$ 729,502	$ 736,418
Total, Weighted Average Coupon (as a percent)	4.66%	4.97%
Commercial loans and leases | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 1,049,997	$ 978,840
Originated, Weighted Average Coupon (as a percent)	7.71%	7.61%
Acquired loans	$ 2,411	$ 3,249
Acquired, Weighted Average Coupon (as a percent)	5.98%	5.97%
Total loans and leases	$ 1,052,408	$ 982,089
Total, Weighted Average Coupon (as a percent)	7.71%	7.60%
Commercial loans and leases | Condominium association
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 56,838	$ 50,451
Originated, Weighted Average Coupon (as a percent)	4.84%	4.70%
Acquired loans	$ 0	$ 0
Acquired, Weighted Average Coupon (as a percent)	0.00%	0.00%
Total loans and leases	$ 56,838	$ 50,451
Total, Weighted Average Coupon (as a percent)	4.84%	4.70%
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 1,093,443	$ 1,007,333
Originated, Weighted Average Coupon (as a percent)	4.18%	4.44%
Acquired loans	$ 136,403	$ 175,489
Acquired, Weighted Average Coupon (as a percent)	4.54%	4.70%
Total loans and leases	$ 1,229,846	$ 1,182,822
Total, Weighted Average Coupon (as a percent)	4.22%	4.48%
Consumer loans | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 711,522	$ 653,059
Originated, Weighted Average Coupon (as a percent)	4.06%	4.09%
Acquired loans	$ 102,723	$ 129,909
Acquired, Weighted Average Coupon (as a percent)	4.40%	4.45%
Total loans and leases	$ 814,245	$ 782,968
Total, Weighted Average Coupon (as a percent)	4.10%	4.15%
Consumer loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 343,247	$ 331,014
Originated, Weighted Average Coupon (as a percent)	4.41%	5.05%
Acquired loans	$ 33,572	$ 45,470
Acquired, Weighted Average Coupon (as a percent)	4.93%	5.39%
Total loans and leases	$ 376,819	$ 376,484
Total, Weighted Average Coupon (as a percent)	4.46%	5.09%
Consumer loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans	$ 38,674	$ 23,260
Originated, Weighted Average Coupon (as a percent)	4.44%	5.55%
Acquired loans	$ 108	$ 110
Acquired, Weighted Average Coupon (as a percent)	17.91%	17.81%
Total loans and leases	$ 38,782	$ 23,370
Total, Weighted Average Coupon (as a percent)	4.48%	5.61%