Loans Receivable, Net - Components of Loans Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	$ 10,039,812	$ 9,918,054
Deferred origination costs, net of fees	7,332	7,488
Allowance for loan credit losses	(60,195)	(56,824)	$ (50,598)	$ (48,850)
Total loans receivable, net	9,986,949	9,868,718
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	6,905,228	6,791,691
Commercial | Commercial real estate – investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	5,296,661	5,171,952
Commercial | Commercial real estate – owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	986,366	997,367
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	622,201	622,372
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	3,134,584	3,126,363
Allowance for loan credit losses	(873)	(1,106)	$ (982)	$ (1,268)
Consumer | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	2,881,811	2,861,991
Consumer | Home equity loans and lines and other consumer (“other consumer”)
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	$ 252,773	$ 264,372