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Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | $ 3,159,107 | $ 3,033,655
Originated Loans and Leases | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,075,265 | 2,968,737
Originated Loans and Leases | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 34,245 | 44,334
Originated Loans and Leases | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 49,597 | 20,584
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 227,436 | 258,723
Total Acquired Loans | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 223,930 | 251,103
Total Acquired Loans | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 465 | 2,265
Total Acquired Loans | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,041 | 5,355
Commercial and industrial | Originated Loans and Leases | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 927,866 | 932,067
Commercial and industrial | Originated Loans and Leases | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 902,263 | 919,214
Commercial and industrial | Originated Loans and Leases | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 10,201 | 6,680
Commercial and industrial | Originated Loans and Leases | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 15,402 | 6,173
Commercial and industrial | Originated Loans and Leases | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 93,228 | 108,608
Commercial and industrial | Originated Loans and Leases | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 80,541 | 100,470
Commercial and industrial | Originated Loans and Leases | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 6,315 | 8,068
Commercial and industrial | Originated Loans and Leases | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 6,372 | 70
Commercial and industrial | Total Acquired Loans | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 44,291 | 50,976
Commercial and industrial | Total Acquired Loans | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 44,008 | 50,554
Commercial and industrial | Total Acquired Loans | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial and industrial | Total Acquired Loans | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 283 | 422
Commercial and industrial | Total Acquired Loans | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial and industrial | Total Acquired Loans | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial and industrial | Total Acquired Loans | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial and industrial | Total Acquired Loans | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial real estate | Originated Loans and Leases | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,811,348 | 1,660,782
Commercial real estate | Originated Loans and Leases | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,782,283 | 1,627,713
Commercial real estate | Originated Loans and Leases | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 10,773 | 19,068
Commercial real estate | Originated Loans and Leases | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 18,292 | 14,001
Commercial real estate | Originated Loans and Leases | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 147,582 | 129,712
Commercial real estate | Originated Loans and Leases | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 131,095 | 119,392
Commercial real estate | Originated Loans and Leases | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 6,956 | 9,980
Commercial real estate | Originated Loans and Leases | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 9,531 | 340
Commercial real estate | Originated Loans and Leases | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 179,083 | 202,486
Commercial real estate | Originated Loans and Leases | Construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 179,083 | 201,948
Commercial real estate | Originated Loans and Leases | Construction | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 538
Commercial real estate | Originated Loans and Leases | Construction | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial real estate | Total Acquired Loans | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 181,504 | 206,020
Commercial real estate | Total Acquired Loans | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 178,281 | 198,822
Commercial real estate | Total Acquired Loans | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 465 | 2,265
Commercial real estate | Total Acquired Loans | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 2,758 | 4,933
Commercial real estate | Total Acquired Loans | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 231 | 247
Commercial real estate | Total Acquired Loans | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 231 | 247
Commercial real estate | Total Acquired Loans | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial real estate | Total Acquired Loans | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial real estate | Total Acquired Loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,410 | 1,480
Commercial real estate | Total Acquired Loans | Construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,410 | 1,480
Commercial real estate | Total Acquired Loans | Construction | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
Commercial real estate | Total Acquired Loans | Construction | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | $ 0 | $ 0

X
- 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 No definition available. + Details
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