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Loans and the Allowance for Credit Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment		$ 15,895		$ 14,314
ACL, Collectively evaluated for impairment		56,721		59,072
ACL, Acquired portfolio				5,840
ACL, Acquired with deteriorated credit quality individually analyzed		5,370
Total		77,986	$ 78,684	79,226	$ 74,267	$ 68,724	$ 38,293
Gross loans
Loans Receivable, Individually evaluated for impairment		103,211		80,550
Loans Receivable, Collectively evaluated for impairment		6,469,284		5,192,274
Loans Receivable, Acquired portfolio				961,340
Loans Receivables, Acquired with deteriorated credit quality individually analyzed		15,401		13,517
Total		6,587,896		6,247,681
Commercial Portfolio Segment [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment		14,630		12,985
ACL, Collectively evaluated for impairment		9,487		15,412
ACL, Acquired portfolio				46
ACL, Acquired with deteriorated credit quality individually analyzed		3,219
Total		27,336	25,567	28,443	24,158	9,345	8,349
Gross loans
Loans Receivable, Individually evaluated for impairment		33,970		35,061
Loans Receivable, Collectively evaluated for impairment		1,286,337		1,414,626
Loans Receivable, Acquired portfolio				68,402
Loans Receivables, Acquired with deteriorated credit quality individually analyzed		5,181		3,878
Total	[1]	1,325,488		1,521,967
Commercial Real Estate Portfolio Segment [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment		1,199		1,329
ACL, Collectively evaluated for impairment		40,222		33,373
ACL, Acquired portfolio				4,628
ACL, Acquired with deteriorated credit quality individually analyzed		1,921
Total		43,342	43,815	39,330	40,078	22,655	20,853
Gross loans
Loans Receivable, Individually evaluated for impairment		50,642		15,827
Loans Receivable, Collectively evaluated for impairment		4,380,004		2,959,978
Loans Receivable, Acquired portfolio				802,190
Loans Receivables, Acquired with deteriorated credit quality individually analyzed		5,980		5,555
Total		4,436,626		3,783,550
Commercial Construction Portfolio Segment [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment
ACL, Collectively evaluated for impairment		3,702		7,787
ACL, Acquired portfolio				407
ACL, Acquired with deteriorated credit quality individually analyzed
Total		3,702	4,927	8,194	6,982	8,026	7,304
Gross loans
Loans Receivable, Individually evaluated for impairment		12,582		24,284
Loans Receivable, Collectively evaluated for impairment		540,314		574,118
Loans Receivable, Acquired portfolio				19,345
Loans Receivables, Acquired with deteriorated credit quality individually analyzed
Total		552,896		617,747
Residential Real Estate Portfolio Segment [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment		66
ACL, Collectively evaluated for impairment		3,302		1,928
ACL, Acquired portfolio				759
ACL, Acquired with deteriorated credit quality individually analyzed		230
Total		3,598	4,366	2,687	2,500	1,690	1,685
Gross loans
Loans Receivable, Individually evaluated for impairment		6,017		5,378
Loans Receivable, Collectively evaluated for impairment		260,536		241,925
Loans Receivable, Acquired portfolio				71,177
Loans Receivables, Acquired with deteriorated credit quality individually analyzed		4,240		4,084
Total		270,793		322,564
Consumer Portfolio Segment [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment
ACL, Collectively evaluated for impairment		8		4
ACL, Acquired portfolio
ACL, Acquired with deteriorated credit quality individually analyzed
Total		8	9	4	3	5	3
Gross loans
Loans Receivable, Individually evaluated for impairment
Loans Receivable, Collectively evaluated for impairment		2,093		1,627
Loans Receivable, Acquired portfolio				226
Loans Receivables, Acquired with deteriorated credit quality individually analyzed
Total		2,093		1,853
Unallocated [Member]
Loans and the Allowance for Loan and Lease Losses (Details) - Allowance for loan and lease losses [Line Items]
ACL, Individually evaluated for impairment
ACL, Collectively evaluated for impairment				568
ACL, Acquired portfolio
ACL, Acquired with deteriorated credit quality individually analyzed
Total				$ 568	$ 546	$ 27,003	$ 99
[1] Included in commercial loans as of September 30, 2021 and December 31, 2020 were PPP loans of $177.8 million and $397.5 million, respectively.

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