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Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 3,072,759	$ 3,033,655
Originated Loans and Leases | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,002,467	2,968,737
Originated Loans and Leases | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	34,546	44,334
Originated Loans and Leases | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	35,746	20,584
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	247,572	258,723
Total Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	243,628	251,103
Total Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	476	2,265
Total Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,468	5,355
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	916,520	932,067
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	897,768	919,214
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	8,899	6,680
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,853	6,173
Commercial and industrial | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	93,896	108,608
Commercial and industrial | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	84,257	100,470
Commercial and industrial | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	4,520	8,068
Commercial and industrial | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,119	70
Commercial and industrial | Total Acquired Loans | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	50,529	50,976
Commercial and industrial | Total Acquired Loans | Commercial and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	50,251	50,554
Commercial and industrial | Total Acquired Loans | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Total Acquired Loans | Commercial and industrial other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	278	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 | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,726,674	1,660,782
Commercial real estate | Originated Loans and Leases | Commercial and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,695,690	1,627,713
Commercial real estate | Originated Loans and Leases | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	15,624	19,068
Commercial real estate | Originated Loans and Leases | Commercial and industrial other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	15,360	14,001
Commercial real estate | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	135,484	129,712
Commercial real estate | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	124,567	119,392
Commercial real estate | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,503	9,980
Commercial real estate | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,414	340
Commercial real estate | Originated Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	200,185	202,486
Commercial real estate | Originated Loans and Leases | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	200,185	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 | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	195,346	206,020
Commercial real estate | Total Acquired Loans | Commercial and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	191,680	198,822
Commercial real estate | Total Acquired Loans | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	476	2,265
Commercial real estate | Total Acquired Loans | Commercial and industrial other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,190	4,933
Commercial real estate | Total Acquired Loans | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	241	247
Commercial real estate | Total Acquired Loans | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	241	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	1,456	1,480
Commercial real estate | Total Acquired Loans | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,456	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.

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