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Allowance for Loan and Lease Losses - Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 4,806,306 | $ 4,672,909
Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 13,073 | 12,350
Collectively evaluated for impairment | 4,521,765 | 4,349,982
Total | 4,534,838 | 4,362,332
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,441 | 3,471
Loans acquired with deteriorated credit quality | 11,309 | 11,962
Collectively evaluated for impairment | 256,718 | 295,144
Total | 271,468 | 310,577
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,065,385 | 1,091,651
Commercial and industrial | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,928 | 1,759
Collectively evaluated for impairment | 1,017,166 | 1,038,916
Total | 1,021,094 | 1,040,675
Commercial and industrial | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 261 | 276
Loans acquired with deteriorated credit quality | 209 | 506
Collectively evaluated for impairment | 43,821 | 50,194
Total | 44,291 | 50,976
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,321,158 | 2,200,727
Commercial Real Estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 5,136 | 6,626
Collectively evaluated for impairment | 2,132,877 | 1,986,354
Total | 2,138,013 | 1,992,980
Commercial Real Estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 1,400 | 1,372
Loans acquired with deteriorated credit quality | 5,974 | 7,481
Collectively evaluated for impairment | 175,771 | 198,894
Total | 183,145 | 207,747
Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,338,406 | 1,302,941
Residential real estate | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 4,009 | 3,965
Collectively evaluated for impairment | 1,291,224 | 1,247,887
Total | 1,295,233 | 1,251,852
Residential real estate | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 1,780 | 1,823
Loans acquired with deteriorated credit quality | 5,126 | 3,975
Collectively evaluated for impairment | 36,267 | 45,291
Total | 43,173 | 51,089
Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 67,302 | 63,123
Consumer and other | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Collectively evaluated for impairment | 66,443 | 62,358
Total | 66,443 | 62,358
Consumer and other | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Loans acquired with deteriorated credit quality | 0 | 0
Collectively evaluated for impairment | 859 | 765
Total | 859 | 765
Finance Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 14,055 | 14,467
Finance Leases | Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Collectively evaluated for impairment | 14,055 | 14,467
Total | 14,055 | 14,467
Finance Leases | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Covered loans | Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 0 | 0
Loans acquired with deteriorated credit quality | 0 | 0
Collectively evaluated for impairment | 0 | 0
Total | $ 0 | $ 0

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- Definition Refers to deteriorated credit quality of acquired receivables. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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