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Internal Risk Rating Categories for Commercial Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | $ 4,874,718 | $ 4,539,256
Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,093,629 | 888,528
Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 3,251,248 | 3,116,561
Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 365,165 | 401,797
Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 164,676 | 132,370
Pass [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 4,695,094 | 4,345,232
Pass [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,014,370 | 806,331
Pass [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 3,156,989 | 3,007,672
Pass [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 361,884 | 400,964
Pass [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 161,851 | 130,265
Potential weakness [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 74,886 | 87,822
Potential weakness [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 16,860 | 16,563
Potential weakness [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 56,840 | 69,788
Potential weakness [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 298 | 0
Potential weakness [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 888 | 1,471
Definite weakness [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 101,248 | 99,516
Definite weakness [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 58,909 | 59,415
Definite weakness [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 37,419 | 38,637
Definite weakness [Member] | Construction Loans [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 2,983 | 833
Definite weakness [Member] | Small Business [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 1,937 | 631
Parital loss probable [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 3,490 | 6,686
Parital loss probable [Member] | Commercial and Industrial [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 3,490 | 6,219
Parital loss probable [Member] | Commercial Real Estate [Member] |  |
Internal risk-rating categories for the Company's commercial portfolio |  |
Financing Receivable, Net | 0 | 464
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 | 0 | 3
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://fasb.org/us-gaap/role/ref/legacyRef -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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