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Loan and Lease Financings (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Receivables [Abstract] |  |
Number of methods to assess credit risk | item | 2 |
Loan and Lease Financings |  |
Recorded investment in loans and leases | $ 4,691,097,000 | $ 4,527,678,000
Loan and lease financings excluding residential real estate and consumer loans |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 4,039,325,000 | 3,873,410,000
Commercial and agricultural |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 1,011,700,000 | 929,997,000
Auto and light truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 511,051,000 | 496,816,000
Medium and heavy duty truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 280,010,000 | 296,935,000
Aircraft |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 868,419,000 | 844,657,000
Construction equipment |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 619,219,000 | 563,437,000
Commercial real estate |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 748,926,000 | 741,568,000
Credit Quality Grades 1-6 | Loan and lease financings excluding residential real estate and consumer loans |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 3,921,930,000 | 3,776,621,000
Credit Quality Grades 1-6 | Commercial and agricultural |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 984,159,000 | 906,074,000
Credit Quality Grades 1-6 | Auto and light truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 491,220,000 | 482,455,000
Credit Quality Grades 1-6 | Medium and heavy duty truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 276,977,000 | 293,318,000
Credit Quality Grades 1-6 | Aircraft |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 837,584,000 | 815,956,000
Credit Quality Grades 1-6 | Construction equipment |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 599,003,000 | 552,684,000
Credit Quality Grades 1-6 | Commercial real estate |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 732,987,000 | 726,134,000
Credit Quality Grades 7-12 |  |
Loan and Lease Financings |  |
Relationships reviewed quarterly as part of management's evaluation of the appropriateness of the reserve for loan and lease losses | 100,000 |
Credit Quality Grades 7-12 | Loan and lease financings excluding residential real estate and consumer loans |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 117,395,000 | 96,789,000
Credit Quality Grades 7-12 | Commercial and agricultural |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 27,541,000 | 23,923,000
Credit Quality Grades 7-12 | Auto and light truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 19,831,000 | 14,361,000
Credit Quality Grades 7-12 | Medium and heavy duty truck |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 3,033,000 | 3,617,000
Credit Quality Grades 7-12 | Aircraft |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 30,835,000 | 28,701,000
Credit Quality Grades 7-12 | Construction equipment |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | 20,216,000 | 10,753,000
Credit Quality Grades 7-12 | Commercial real estate |  |
Loan and Lease Financings |  |
Recorded investment in loans and leases | $ 15,939,000 | $ 15,434,000

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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