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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 26,389	$ 25,194
Foreclosed properties, net	1,069	1,472
Total non-performing assets	27,458	26,666
Performing troubled debt restructurings	332	717	$ 1,735
Total impaired assets	$ 27,790	$ 27,383
Total non-accrual loans and leases to gross loans and leases	1.76%	1.74%
Total non-performing assets to total gross loans and leases plus foreclosed properties, net	1.83%	1.83%
Total non-performing assets to total assets	1.53%	1.50%
Allowance for loan and lease losses to gross loans and leases	1.25%	1.44%
Allowance for loan and lease losses to non-accrual loans and leases	71.10%	83.00%
Commercial real estate — owner occupied
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 7,021	$ 2,223
Commercial real estate — non-owner occupied
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	34	1,609
Land development
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	2,626	3,440
Construction
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	2,872	2,918
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	1,161	1,937
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	13,714	12,127
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	12,321	12,463
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	354	604
Total consumer and other loans
Financing Receivable, Impaired [Line Items]
Non-accruing loans and leases	$ 354	$ 604

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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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Ratio of Total Nonperforming Assets to Gross Loans and Leases Plus Foreclosed Properties, Net

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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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