Loans Receivable, Net - Components of Loans Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	$ 9,718,760		$ 8,622,870
Deferred origination costs, net of fees	7,249		9,332
Allowance for loan credit losses	(53,521)	$ (52,061)	(48,850)	$ (50,153)	$ (53,876)	$ (60,735)
Total loans receivable, net	9,672,488		8,583,352
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	6,644,041		5,882,350
Commercial | Commercial real estate – investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	5,007,637		4,378,061
Commercial | Commercial real estate – owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	983,784		1,055,065
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	652,620		449,224
Commercial | Commercial and industrial | Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	3,000		22,900
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	3,074,719		2,740,520
Allowance for loan credit losses	(1,088)	$ (996)	(1,268)	$ (1,641)	$ (1,267)	$ (1,770)
Consumer | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans receivable	2,813,209		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	$ 261,510		$ 260,819