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Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Originated Loans and Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | $ 3,177,726 | $ 3,195,492
Originated Loans and Leases | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,108,142 | 3,123,455
Originated Loans and Leases | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 33,689 | 28,074
Originated Loans and Leases | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 35,895 | 43,963
Total Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 216,414 | 222,804
Total Acquired Loans | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 213,314 | 219,438
Total Acquired Loans | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 270 | 452
Total Acquired Loans | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 2,830 | 2,914
Commercial and industrial | Originated Loans and Leases | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 910,784 | 926,429
Commercial and industrial | Originated Loans and Leases | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 897,192 | 910,476
Commercial and industrial | Originated Loans and Leases | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 10,228 | 8,675
Commercial and industrial | Originated Loans and Leases | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,364 | 7,278
Commercial and industrial | Originated Loans and Leases | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 94,737 | 107,494
Commercial and industrial | Originated Loans and Leases | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 82,819 | 93,939
Commercial and industrial | Originated Loans and Leases | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 4,979 | 4,951
Commercial and industrial | Originated Loans and Leases | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 6,939 | 8,604
Commercial and industrial | Total Acquired Loans | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 42,665 | 43,712
Commercial and industrial | Total Acquired Loans | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 42,429 | 43,447
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 | 236 | 265
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 | 1,834,496 | 1,827,279
Commercial real estate | Originated Loans and Leases | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,804,845 | 1,797,599
Commercial real estate | Originated Loans and Leases | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 14,547 | 9,484
Commercial real estate | Originated Loans and Leases | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 15,104 | 20,196
Commercial real estate | Originated Loans and Leases | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 170,528 | 170,005
Commercial real estate | Originated Loans and Leases | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 156,105 | 157,156
Commercial real estate | Originated Loans and Leases | Agriculture | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 3,935 | 4,964
Commercial real estate | Originated Loans and Leases | Agriculture | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 10,488 | 7,885
Commercial real estate | Originated Loans and Leases | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 167,181 | 164,285
Commercial real estate | Originated Loans and Leases | Construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 167,181 | 164,285
Commercial real estate | Originated Loans and Leases | Construction | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 0 | 0
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 | 172,169 | 177,484
Commercial real estate | Total Acquired Loans | Other | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 169,305 | 174,383
Commercial real estate | Total Acquired Loans | Other | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 270 | 452
Commercial real estate | Total Acquired Loans | Other | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 2,594 | 2,649
Commercial real estate | Total Acquired Loans | Agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 219 | 224
Commercial real estate | Total Acquired Loans | Agriculture | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 219 | 224
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 | 1,361 | 1,384
Commercial real estate | Total Acquired Loans | Construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases, gross | 1,361 | 1,384
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
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