Loans and the Allowance for Loan Losses (Details) - Credit quality indicators - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 6,247,681	$ 5,118,294
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,047,888	4,998,910
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	79,868	37,069
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	119,710	82,315
Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	215
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,521,967	1,129,661
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,447,097	1,059,852
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	30,725	22,159
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	43,930	47,650
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	215
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,783,550	3,041,959
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,700,498	3,014,956
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	49,143	10,301
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	33,909	16,702
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Commercial construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	617,747	623,326
Commercial construction [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	587,266	604,298
Commercial construction [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount		4,609
Commercial construction [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	30,481	14,419
Commercial construction [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	322,564	320,020
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	311,174	316,476
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,390	3,544
Residential Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,853	3,328
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,853	3,328
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount