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Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 3,148,513	$ 3,033,655
Originated Loans and Leases | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,062,873	2,968,737
Originated Loans and Leases | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	44,068	44,334
Originated Loans and Leases | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	41,572	20,584
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	237,355	258,723
Total Acquired Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	233,706	251,103
Total Acquired Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	469	2,265
Total Acquired Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	3,180	5,355
Commercial and industrial | Originated Loans and Leases | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	939,058	932,067
Commercial and industrial | Originated Loans and Leases | Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	916,710	919,214
Commercial and industrial | Originated Loans and Leases | Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	16,497	6,680
Commercial and industrial | Originated Loans and Leases | Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,851	6,173
Commercial and industrial | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	95,618	108,608
Commercial and industrial | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	80,377	100,470
Commercial and industrial | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	4,655	8,068
Commercial and industrial | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	10,586	70
Commercial and industrial | Total Acquired Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	45,965	50,976
Commercial and industrial | Total Acquired Loans | Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	45,682	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	1,737,686	1,660,782
Commercial real estate | Originated Loans and Leases | Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,705,560	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	17,250	19,068
Commercial real estate | Originated Loans and Leases | Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	14,876	14,001
Commercial real estate | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	143,229	129,712
Commercial real estate | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	127,304	119,392
Commercial real estate | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,666	9,980
Commercial real estate | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	10,259	340
Commercial real estate | Originated Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	232,922	202,486
Commercial real estate | Originated Loans and Leases | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	232,922	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	189,722	206,020
Commercial real estate | Total Acquired Loans | Other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	186,356	198,822
Commercial real estate | Total Acquired Loans | Other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	469	2,265
Commercial real estate | Total Acquired Loans | Other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,897	4,933
Commercial real estate | Total Acquired Loans | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	236	247
Commercial real estate | Total Acquired Loans | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	236	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	1,432	1,480
Commercial real estate | Total Acquired Loans | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,432	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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