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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 49,481	$ 51,855
Total Past Due	58,797	69,811
Current	5,059,497	4,475,088
Loans	5,118,294	4,544,899
30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	5,576	13,786
60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	633	2,523
90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	3,107	1,647
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	31,455	29,340
Total Past Due	34,801	32,660
Current	1,094,860	956,098
Loans	1,129,661	988,758
Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	239	1,673
Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Commercial Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	3,107	1,647
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,338	15,135
Total Past Due	10,808	23,137
Current	3,031,151	2,755,030
Loans	3,041,959	2,778,167
Loans Receivable > 90 Days Past Due and Accruing		0
Commercial Real Estate Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	1,980	6,162
Commercial Real Estate Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	490	1,840
Commercial Real Estate Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Commercial construction [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,773	2,934
Total Past Due	6,773	5,994
Current	616,553	459,395
Loans	623,326	465,389
Commercial construction [Member] | 30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		2,496
Commercial construction [Member] | 60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		564
Commercial construction [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,915	4,446
Total Past Due	6,415	8,020
Current	313,605	301,971
Loans	320,020	309,991
Residential Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	3,357	3,455
Residential Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	143	119
Residential Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual
Total Past Due
Current	3,328	2,594
Loans	3,328	2,594
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Consumer Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due
Consumer Portfolio Segment [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due

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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.

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