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Allowance for Credit Losses - Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 10,337 |
Total loans and leases, net of unearned income and deferred costs and fees | 5,424,285 | $ 4,917,550
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 621 |
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 8,157 |
Originated |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 19,385
Collectively evaluated for impairment |  | 4,681,661
Total loans and leases, net of unearned income and deferred costs and fees |  | 4,701,046
Originated | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 2,110
Collectively evaluated for impairment |  | 966,875
Total loans and leases, net of unearned income and deferred costs and fees |  | 968,985
Originated | Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 13,496
Collectively evaluated for impairment |  | 2,283,152
Total loans and leases, net of unearned income and deferred costs and fees |  | 2,296,648
Originated | Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 3,779
Collectively evaluated for impairment |  | 1,340,687
Total loans and leases, net of unearned income and deferred costs and fees |  | 1,344,466
Originated | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 0
Collectively evaluated for impairment |  | 73,625
Total loans and leases, net of unearned income and deferred costs and fees |  | 73,625
Originated | Finance Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 0
Collectively evaluated for impairment |  | 17,322
Total loans and leases, net of unearned income and deferred costs and fees |  | 17,322
Acquired |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 2,830
Loans acquired with deteriorated credit quality |  | 9,149
Collectively evaluated for impairment |  | 208,170
Total loans and leases, net of unearned income and deferred costs and fees |  | 220,149
Acquired | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 2
Loans acquired with deteriorated credit quality |  | 173
Collectively evaluated for impairment |  | 38,901
Total loans and leases, net of unearned income and deferred costs and fees |  | 39,076
Acquired | Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 714
Loans acquired with deteriorated credit quality |  | 5,674
Collectively evaluated for impairment |  | 140,529
Total loans and leases, net of unearned income and deferred costs and fees |  | 146,917
Acquired | Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 2,114
Loans acquired with deteriorated credit quality |  | 3,302
Collectively evaluated for impairment |  | 27,955
Total loans and leases, net of unearned income and deferred costs and fees |  | 33,371
Acquired | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 0
Loans acquired with deteriorated credit quality |  | 0
Collectively evaluated for impairment |  | 785
Total loans and leases, net of unearned income and deferred costs and fees |  | 785
Acquired | Finance Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  | 0
Loans acquired with deteriorated credit quality |  | 0
Collectively evaluated for impairment |  | 0
Total loans and leases, net of unearned income and deferred costs and fees |  | $ 0

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