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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Non-accrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 25,301	$ 26,389
Foreclosed properties, net	2,547	1,069
Total non-performing assets	27,848	27,458
Performing troubled debt restructurings	180	332	$ 717
Total impaired assets	$ 28,028	$ 27,790
Total non-accrual loans and leases to gross loans and leases	1.56%	1.76%
Total non-performing assets to total gross loans and leases plus foreclosed properties, net	1.72%	1.83%
Total non-performing assets to total assets	1.42%	1.53%
Allowance for loan and lease losses to gross loans and leases	1.26%	1.25%
Allowance for loan and lease losses to non-accrual loans and leases	80.73%	71.10%
Commercial real estate — owner occupied
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 5,663	$ 7,021
Commercial real estate — non-owner occupied
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	31	34
Land development
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	2,213	2,626
Construction
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	0	2,872
Multi-family
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	0	0
1-4 family
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	0	1,161
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	7,907	13,714
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	17,104	12,321
Direct financing leases, net
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	0	0
Home equity and second mortgages
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	0	0
Other
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	290	354
Total consumer and other loans
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 290	$ 354

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Impaired Assets

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Ratio of Allowance for Loan and Lease Losses to Total Gross Loans and Leases

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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