Loans and the Allowance for Credit Losses (Details) - Composition of loan portfolio - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Gross loans		$ 6,838,351	$ 6,247,681
Net deferred fees		(9,729)	(11,374)
Total loans receivable		6,828,622	6,236,307
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	[1]	1,299,428	1,521,967
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		4,741,590	3,783,550
Commercial Construction Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		540,178	617,747
Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		255,269	322,564
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		$ 1,886	$ 1,853

[1] Included in commercial loans as of December 31, 2021 and December 31, 2020 were Paycheck Protection Program (“PPP”) loans of $93.1 million and $397.5 million, respectively. These loans are 100% federally guaranteed and currently not subject to any allocation of allowance for credit losses.