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Loans and the Allowance for Credit Losses (Details) - Credit Quality Indicators - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Gross loans		$ 6,295,508	$ 6,247,681
Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans			6,047,888
Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans			79,868
Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans			119,710
Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans			215
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans	[1]	1,622,652	1,521,967
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		1,548,938	1,447,097
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		29,369	30,725
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		44,136	43,930
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		209	215
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		3,797,244	3,783,550
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		3,708,305	3,700,498
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		48,965	49,143
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		39,974	33,909
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Commercial Construction Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		565,872	617,747
Commercial Construction Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		540,422	587,266
Commercial Construction Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Commercial Construction Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		25,450	30,481
Commercial Construction Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		306,376	322,564
Residential Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		292,886	311,174
Residential Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Residential Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		13,490	11,390
Residential Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		3,364	1,853
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Impaired [Line Items]
Gross loans		3,364	1,853
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Gross loans
[1] Included in commercial loans as of March 31, 2021 and December 31, 2020 are PPP loans of $522.3 million and $397.5 million, respectively.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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