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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

- 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.

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