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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 65,613 | $ 5,734
Total Past Due | 72,784 | 20,551
Current | 4,102,026 | 3,458,890
Loans | 4,174,810 | 3,479,441
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,849 | 7,534
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,658 | 1,990
90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,664 | 5,293
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 47,363 | 1,460
Total Past Due | 50,918 | 6,583
Current | 773,164 | 546,993
Loans | 824,082 | 553,576
Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,708 | 475
Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 183 | 18
Commercial Portfolio Segment [Member] | 90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,664 | 4,630
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 12,757 | 1,081
Total Past Due | 14,777 | 8,256
Current | 2,578,132 | 2,196,454
Loans | 2,592,909 | 2,204,710
Loans Receivable > 90 Days Past Due and Accruing | 0 |
Commercial Real Estate Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 545 | 4,928
Commercial Real Estate Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,475 | 1,584
Commercial Real Estate Portfolio Segment [Member] | 90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 663
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due |  |
Current | 483,216 | 486,228
Loans | 483,216 | 486,228
Construction Loans [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |
Construction Loans [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |
Construction Loans [Member] | 90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 5,493 | 3,193
Total Past Due | 7,071 | 5,712
Current | 264,724 | 226,835
Loans | 271,795 | 232,547
Residential Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,578 | 2,131
Residential Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 388
Residential Portfolio Segment [Member] | 90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due | 18 |
Current | 2,790 | 2,380
Loans | 2,808 | 2,380
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 18 |
Consumer Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |
Consumer Portfolio Segment [Member] | 90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  |

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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