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Internal Risk Rating Categories for Commercial Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | $ 4,355,968 | $ 3,966,324
Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 902,053 | 843,276
Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 3,010,798 | 2,653,434
Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 320,391 | 373,368
Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 122,726 | 96,246
Pass [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 4,097,798 | 3,706,567
Pass [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 783,825 | 765,753
Pass [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 2,876,570 | 2,484,025
Pass [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 317,099 | 363,781
Pass [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 120,304 | 93,008
Potential weakness [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 134,039 | 176,519
Potential weakness [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 46,176 | 54,375
Potential weakness [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 84,641 | 112,022
Potential weakness [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,363 | 7,678
Potential weakness [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,859 | 2,444
Definite weakness [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 121,640 | 81,990
Definite weakness [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 71,991 | 23,073
Definite weakness [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 47,164 | 56,276
Definite weakness [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,929 | 1,909
Definite weakness [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 556 | 732
Parital loss probable [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 2,491 | 1,248
Parital loss probable [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 61 | 75
Parital loss probable [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 2,423 | 1,111
Parital loss probable [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 0
Parital loss probable [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 7 | 62
Definite loss [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 0
Definite loss [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 0
Definite loss [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 0
Definite loss [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 0
Definite loss [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | $ 0 | $ 0

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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