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Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 3,228,715	$ 3,195,492
Originated Loans and Leases | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,128,528	3,123,455
Originated Loans and Leases | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	41,314	28,074
Originated Loans and Leases | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	58,873	43,963
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	192,560	222,804
Total Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	189,490	219,438
Total Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	261	452
Total Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,809	2,914
Commercial and Industrial | Originated Loans and Leases | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	860,432	926,429
Commercial and Industrial | Originated Loans and Leases | Consumer Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	844,309	910,476
Commercial and Industrial | Originated Loans and Leases | Consumer Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	11,875	8,675
Commercial and Industrial | Originated Loans and Leases | Consumer Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	4,248	7,278
Commercial and Industrial | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	94,302	107,494
Commercial and Industrial | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	77,175	93,939
Commercial and Industrial | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,703	4,951
Commercial and Industrial | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	15,424	8,604
Commercial and Industrial | Total Acquired Loans | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	39,771	43,712
Commercial and Industrial | Total Acquired Loans | Consumer Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	39,521	43,447
Commercial and Industrial | Total Acquired Loans | Consumer Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and Industrial | Total Acquired Loans | Consumer Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	250	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 | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,902,939	1,827,279
Commercial Real Estate | Originated Loans and Leases | Consumer Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,853,220	1,797,599
Commercial Real Estate | Originated Loans and Leases | Consumer Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	25,631	9,484
Commercial Real Estate | Originated Loans and Leases | Consumer Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	24,088	20,196
Commercial Real Estate | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	180,385	170,005
Commercial Real Estate | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	163,167	157,156
Commercial Real Estate | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,105	4,964
Commercial Real Estate | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	15,113	7,885
Commercial Real Estate | Originated Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	190,657	164,285
Commercial Real Estate | Originated Loans and Leases | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	190,657	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 | Consumer Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	151,223	177,484
Commercial Real Estate | Total Acquired Loans | Consumer Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	148,403	174,383
Commercial Real Estate | Total Acquired Loans | Consumer Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	261	452
Commercial Real Estate | Total Acquired Loans | Consumer Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,559	2,649
Commercial Real Estate | Total Acquired Loans | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	208	224
Commercial Real Estate | Total Acquired Loans | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	208	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	1,358	1,384
Commercial Real Estate | Total Acquired Loans | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,358	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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