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Allowance for Loan and Lease Losses - Credit Quality Indicators by Class of Commercial and Industrial (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	$ 267,913	$ 330,125
Acquired | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	259,181	316,458
Acquired | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	539	526
Acquired | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	8,193	13,141
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,863,118	2,635,335
Originated Loans and Leases | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	2,792,163	2,594,534
Originated Loans and Leases | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	50,423	20,485
Originated Loans and Leases | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	20,532	20,316
Commercial and industrial | Acquired | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	53,484	79,317
Commercial and industrial | Acquired | Other financing receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	52,370	77,921
Commercial and industrial | Acquired | Other financing receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Acquired | Other financing receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,114	1,396
Commercial and industrial | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Acquired | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Acquired | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Acquired | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial and industrial | Originated Loans and Leases | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	895,348	847,055
Commercial and industrial | Originated Loans and Leases | Other financing receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	876,622	836,788
Commercial and industrial | Originated Loans and Leases | Other financing receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	12,943	7,218
Commercial and industrial | Originated Loans and Leases | Other financing receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	5,783	3,049
Commercial and industrial | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	91,054	118,247
Commercial and industrial | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	81,523	117,135
Commercial and industrial | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,455	755
Commercial and industrial | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	76	357
Commercial real estate | Acquired | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	212,646	241,605
Commercial real estate | Acquired | Other financing receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	205,028	229,334
Commercial real estate | Acquired | Other financing receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	539	526
Commercial real estate | Acquired | Other financing receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	7,079	11,745
Commercial real estate | Acquired | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	257	267
Commercial real estate | Acquired | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	257	267
Commercial real estate | Acquired | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial real estate | Acquired | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial real estate | Acquired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,526	8,936
Commercial real estate | Acquired | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,526	8,936
Commercial real estate | Acquired | Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial real estate | Acquired | Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	0
Commercial real estate | Originated Loans and Leases | Other financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,537,194	1,431,690
Commercial real estate | Originated Loans and Leases | Other financing receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	1,503,943	1,403,370
Commercial real estate | Originated Loans and Leases | Other financing receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	18,578	11,939
Commercial real estate | Originated Loans and Leases | Other financing receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	14,673	16,381
Commercial real estate | Originated Loans and Leases | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	122,304	102,509
Commercial real estate | Originated Loans and Leases | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	112,857	101,407
Commercial real estate | Originated Loans and Leases | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	9,447	573
Commercial real estate | Originated Loans and Leases | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	0	529
Commercial real estate | Originated Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	217,218	135,834
Commercial real estate | Originated Loans and Leases | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases, gross	217,218	135,834
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

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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