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Loans and the Allowance for Loan Losses (Details) - Aging analysis - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 12,790 | $ 5,734
Total Past Due and Nonaccrual | 23,992 | 20,551
Current | 3,550,837 | 3,458,890
Total Loans Receivable | 3,574,829 | 3,479,441
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 5,328 | 7,534
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 451 | 1,990
90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 5,423 | 5,293
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 1,208 | 1,460
Total Past Due and Nonaccrual | 6,631 | 6,583
Current | 535,059 | 546,993
Total Loans Receivable | 541,690 | 553,576
Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 475
Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 18
Commercial Portfolio Segment [Member] | 90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 5,423 | 4,630
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 7,487 | 1,081
Total Past Due and Nonaccrual | 11,580 | 8,256
Current | 2,315,254 | 2,196,454
Total Loans Receivable | 2,326,834 | 2,204,710
Commercial Real Estate Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 3,649 | 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 and Nonaccrual | 444 | 1,584
Commercial Real Estate Portfolio Segment [Member] | 90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  | 663
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual |  |
Current | 460,611 | 486,228
Total Loans Receivable | 460,611 | 486,228
Construction Loans [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
Construction Loans [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
Construction Loans [Member] | 90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 4,095 | 3,193
Total Past Due and Nonaccrual | 5,711 | 5,712
Current | 237,112 | 226,835
Total Loans Receivable | 242,883 | 232,547
Residential Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1,670 | 2,131
Residential Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 6 | 388
Residential Portfolio Segment [Member] | 90 Days or Greater Past Due and Still Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual |  |
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual |  |
Total Past Due and Nonaccrual | 10 |
Current | 2,801 | 2,380
Total Loans Receivable | 2,811 | 2,380
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 9 |
Consumer Portfolio Segment [Member] | 60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due and Nonaccrual | 1 |
Consumer Portfolio Segment [Member] | 90 Days or Greater Past Due and Still Accruing [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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