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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Loan Composition) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Commercial real estate — owner occupied	$ 203,733		$ 200,387
Commercial real estate — non-owner occupied	487,842		470,236
Land development	45,009		40,154
Construction	132,271		125,157
Multi-family	174,664		136,978
1-4 family	35,729		44,976
Total commercial real estate	1,079,248		1,017,888
Commercial and industrial	457,932		429,002
Direct financing leases, net	31,090		30,787
Home equity and second mortgages	8,388		7,262
Other	23,451		18,099
Total consumer and other	31,839		25,361
Total gross loans and leases receivable	1,600,109		1,503,038
Allowance for loan and lease losses	20,455	$ 20,932	18,763	$ 19,923	$ 21,677	$ 20,912
Deferred loan fees	1,502		1,443
Loans and leases receivable, net	$ 1,578,152		$ 1,482,832

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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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