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Loans and the Allowance for Loan Losses (Details) - Credit quality indicators - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans $ 6,013,819 $ 5,118,294
Commercial Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,240,227 1,129,661
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,707,391 3,041,959
Commercial Construction Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 676,836 623,326
Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 387,400 320,020
Consumer Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,965 3,328
Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 5,872,019 4,998,910
Pass [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,171,739 1,059,852
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,673,963 3,014,956
Pass [Member] | Commercial Construction Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 646,993 604,298
Pass [Member] | Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 377,359 316,476
Pass [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 1,965 3,328
Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 36,858 37,069
Special Mention [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 21,226 22,159
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 11,837 10,301
Special Mention [Member] | Commercial Construction Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 3,505 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 105,232 82,315
Substandard [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 47,262 47,650
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 21,591 16,702
Substandard [Member] | Commercial Construction Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 26,338 14,419
Substandard [Member] | Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans 10,041 3,544
Substandard [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross loans
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