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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	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired
Non-accrual loans and leases	$ 17,861	$ 22,298
Foreclosed properties, net	1,677	1,677	$ 1,693
Total non-performing assets	19,538	23,975
Performing troubled debt restructurings	1,628	1,735
Total impaired assets	$ 21,166	$ 25,710
Total non-accrual loans and leases to gross loans and leases	1.23%	1.55%
Total non-performing assets to total gross loans and leases plus foreclosed properties, net	1.34%	1.67%
Total non-performing assets to total assets	1.09%	1.35%
Allowance for loan and lease losses to gross loans and leases	1.15%	1.14%
Allowance for loan and lease losses to non-accrual loans and leases	93.41%	73.17%
Commercial real estate — owner occupied
Financing Receivable, Impaired
Non-accrual loans and leases	$ 2,817	$ 2,907
Commercial real estate — non-owner occupied
Financing Receivable, Impaired
Non-accrual loans and leases	262	1,678
Construction and land development
Financing Receivable, Impaired
Non-accrual loans and leases	4,502	4,729
Multi-family
Financing Receivable, Impaired
Non-accrual loans and leases	0	2
1-4 family
Financing Receivable, Impaired
Non-accrual loans and leases	2,631	2,611
Total non-accrual commercial real estate
Financing Receivable, Impaired
Non-accrual loans and leases	$ 10,212	$ 11,927
Allowance for loan and lease losses to gross loans and leases	1.23%	1.24%
Commercial and industrial
Financing Receivable, Impaired
Non-accrual loans and leases	$ 6,718	$ 9,136
Direct financing leases, net
Financing Receivable, Impaired
Non-accrual loans and leases	0	38
Home equity and second mortgages
Financing Receivable, Impaired
Non-accrual loans and leases	290	542
Other
Financing Receivable, Impaired
Non-accrual loans and leases	641	655
Total non-accrual consumer and other loans
Financing Receivable, Impaired
Non-accrual loans and leases	$ 931	$ 1,197
Allowance for loan and lease losses to gross loans and leases	2.77%	2.89%

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Impaired Assets

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Ratio of Allowance for Loan and Leases Losses to Non-accrual 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
-Topic 310
-SubTopic 10
-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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

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