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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 13,755 | $ 5,734
Total Past Due and Nonaccrual | 28,555 | 20,551
Current | 3,863,872 | 3,458,890
Gross Loans | 3,892,427 | 3,479,441
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 951 | 1,460
Total Past Due and Nonaccrual | 5,647 | 6,583
Current | 635,966 | 546,993
Gross Loans | 641,613 | 553,576
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 8,369 | 1,081
Total Past Due and Nonaccrual | 17,012 | 8,256
Current | 2,568,193 | 2,196,454
Gross Loans | 2,585,205 | 2,204,710
Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual |  |
Current | 399,453 | 486,228
Gross Loans | 399,453 | 486,228
Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 4,435 | 3,193
Total Past Due and Nonaccrual | 5,894 | 5,712
Current | 258,350 | 226,835
Gross Loans | 264,244 | 232,547
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual | 2 |
Current | 1,910 | 2,380
Gross Loans | 1,912 | 2,380
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1,703 | 7,534
30 - 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 199 | 475
30 - 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 586 | 4,928
30 - 59 Days Past Due [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
30 - 59 Days Past Due [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 918 | 2,131
30 - 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 8,888 | 1,990
60 - 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 288 | 18
60 - 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 8,057 | 1,584
60 - 89 Days Past Due [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
60 - 89 Days Past Due [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 541 | 388
60 - 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 2 |
90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4,209 | 5,293
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 4,209 | 4,630
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 663
90 Days or Greater Past Due and Still Accruing [Member] | Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
90 Days or Greater Past Due and Still Accruing [Member] | Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
90 Days or Greater Past Due and Still Accruing [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |

X
- 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 No definition available. + Details
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