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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 53,015 | $ 65,613
Total Past Due and Nonaccrual | 58,626 | 72,784
Current | 4,407,148 | 4,102,026
Gross Loans | 4,465,774 | 4,174,810
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 29,562 | 47,363
Total Past Due and Nonaccrual | 31,689 | 50,918
Current | 901,480 | 773,164
Gross Loans | 933,169 | 824,082
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 15,927 | 12,757
Total Past Due and Nonaccrual | 19,117 | 14,777
Current | 2,720,826 | 2,578,132
Gross Loans | 2,739,943 | 2,592,909
Commercial Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 2,934 |
Total Past Due and Nonaccrual | 2,934 |
Current | 491,272 | 483,216
Gross Loans | 494,206 | 483,216
Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 4,592 | 5,493
Total Past Due and Nonaccrual | 4,598 | 7,071
Current | 291,350 | 264,724
Gross Loans | 295,948 | 271,795
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual | 288 | 18
Current | 2,220 | 2,790
Gross Loans | 2,508 | 2,808
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 527 | 3,849
30 - 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 233 | 1,708
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 |  | 545
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 | 6 | 1,578
30 - 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 288 | 18
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 3,436 | 1,658
60 - 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 246 | 183
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 | 3,190 | 1,475
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 |  |
60 - 89 Days Past Due [Member] | Consumer 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] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1,648 | 1,664
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 | 1,648 | 1,664
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 |  |
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 |  |

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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 No definition available. + Details
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