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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses 2 (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 15,886		$ 14,272
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	4,569		4,491
Allowance for loan and lease losses	20,455	$ 20,932	18,763	$ 19,923	$ 21,677	$ 20,912
Financing Receivable, Collectively Evaluated for Impairment	1,569,309		1,476,317
Financing Receivable, Individually Evaluated for Impairment	30,551		26,188
Loans and Leases Receivable, Gross	1,600,109		1,503,038
Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	249		533
Commercial real estate:
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	11,086		9,716
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	607		415
Allowance for loan and lease losses	11,693	11,147	10,131	9,535	12,003	12,384
Financing Receivable, Collectively Evaluated for Impairment	1,063,858		1,003,855
Financing Receivable, Individually Evaluated for Impairment	15,144		13,506
Loans and Leases Receivable, Gross	1,079,248		1,017,888
Commercial real estate: | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	246		527
Commercial and industrial loans and leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,082		4,158
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,802		4,067
Allowance for loan and lease losses	7,884	9,237	8,225	9,843	9,090	7,970
Financing Receivable, Collectively Evaluated for Impairment	474,063		447,459
Financing Receivable, Individually Evaluated for Impairment	14,956		12,324
Loans and Leases Receivable, Gross	489,022		459,789
Commercial and industrial loans and leases | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	3		6
Consumer and other:
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	718		398
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	160		9
Allowance for loan and lease losses	878	$ 548	407	$ 545	$ 584	$ 558
Financing Receivable, Collectively Evaluated for Impairment	31,388		25,003
Financing Receivable, Individually Evaluated for Impairment	451		358
Loans and Leases Receivable, Gross	31,839		25,361
Consumer and other: | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	$ 0		$ 0

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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