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Loans and the Allowance for Loan Losses (Details) - Credit quality indicators - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	$ 6,263,260	$ 5,118,294
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	1,631,434	1,129,661
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	3,672,462	3,041,959
Commercial Construction Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	614,112	623,326
Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	343,376	320,020
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	1,876	3,328
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	6,121,647	4,998,910
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	1,566,486	1,059,852
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	3,637,852	3,014,956
Pass [Member] | Commercial Construction Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	583,749	604,298
Pass [Member] | Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	332,686	316,476
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	1,874	3,328
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	34,027	37,069
Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	20,608	22,159
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	13,419	10,301
Special Mention [Member] | Commercial Construction Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans		4,609
Special Mention [Member] | Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	106,586	82,315
Substandard [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	44,340	47,650
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	21,191	16,702
Substandard [Member] | Commercial Construction Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	30,363	14,419
Substandard [Member] | Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	10,690	3,544
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans	2
Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Doubtful [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Doubtful [Member] | Commercial Construction Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Doubtful [Member] | Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans
Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Gross loans

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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=121593590&loc=d3e4428-111522

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