Loans Receivable, Net - Components of Loans Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	$ 9,424,885		$ 8,622,870
Deferred origination costs, net of fees	7,864		9,332
Allowance for loan credit losses	(52,061)	$ (50,598)	(48,850)	$ (53,876)	$ (59,976)	$ (60,735)
Total loans receivable, net	9,380,688		8,583,352
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	6,414,302		5,882,350
Commercial | Commercial real estate – investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	4,808,965		4,378,061
Commercial | Commercial real estate – owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	1,020,873		1,055,065
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	584,464		449,224
Commercial | Commercial and industrial | Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	6,500		22,900
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	3,010,583		2,740,520
Allowance for loan credit losses	(996)	$ (982)	(1,268)	$ (1,267)	$ (1,406)	$ (1,770)
Consumer | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	2,758,269		2,479,701
Consumer | Home equity loans and lines and other consumer (“other consumer”)
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	$ 252,314		$ 260,819