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Loans - TDR's by Class and the Associated Specific Reserves (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2014 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	10	11	10	11
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months	$ 1,593	$ 1,987	$ 1,593	$ 1,987
Days Past Due Placed In T D R In Previous 12 Months	$ 96	$ 588	$ 96	$ 588
Financing Receivable Modifications Number Of Contracts During Period | loan	1	3	1	6
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 111	$ 545	$ 111	$ 892
Financing Receivable Modifications Post Modification Recorded Investment During Period	108	545	108	832
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 8	$ 0	$ 23
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	1	0	1
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months	$ 0	$ 519	$ 0	$ 519
Days Past Due Placed In T D R In Previous 12 Months	$ 0	$ 519	$ 0	$ 519
Financing Receivable Modifications Number Of Contracts During Period | loan	0	2	0	2
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 0	$ 290	$ 0	$ 290
Financing Receivable Modifications Post Modification Recorded Investment During Period	0	290	0	290
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 0	$ 0	$ 0
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	0	0	0
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months		$ 0		$ 0
Financing Receivable Modifications Number Of Contracts During Period | loan	0	0	0	0
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 0	$ 0	$ 0	$ 0
Financing Receivable Modifications Post Modification Recorded Investment During Period	0	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 0	$ 0	$ 0
Commercial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	0	0	0
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months	$ 0	$ 0	$ 0	$ 0
Days Past Due Placed In T D R In Previous 12 Months	$ 0	$ 0	$ 0	$ 0
Financing Receivable Modifications Number Of Contracts During Period | loan	0	0	0	0
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 0	$ 0	$ 0	$ 0
Financing Receivable Modifications Post Modification Recorded Investment During Period	0	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 0	$ 0	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	0	0	0
Financing Receivable Modifications Number Of Contracts During Period | loan	0	0	0	0
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 0	$ 0	$ 0	$ 0
Financing Receivable Modifications Post Modification Recorded Investment During Period	0	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 0	$ 0	$ 0
Residential term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	10	9	10	9
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months	$ 1,593	$ 1,267	$ 1,593	$ 1,267
Days Past Due Placed In T D R In Previous 12 Months	$ 96	$ 48	$ 96	$ 48
Financing Receivable Modifications Number Of Contracts During Period | loan	1	1	1	4
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 111	$ 255	$ 111	$ 602
Financing Receivable Modifications Post Modification Recorded Investment During Period	108	255	108	542
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 8	$ 0	$ 23
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	0	0	0
Financing Receivable Modifications Number Of Contracts During Period | loan			0	0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	1	0	1
Financing Receivable Recorded Investment Greater Than 30 Days Past Due Placed In T D R In Previous12 Months	$ 0	$ 201	$ 0	$ 201
Days Past Due Placed In T D R In Previous 12 Months	$ 0	$ 21	$ 0	$ 21
Financing Receivable Modifications Number Of Contracts During Period | loan	0	0	0	0
Financing Receivable Modifications Pre Modification Recorded Investment During Period	$ 0	$ 0	$ 0	$ 0
Financing Receivable Modifications Post Modification Recorded Investment During Period	0	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific Allowance Current Period	$ 0	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | loan	0	0	0	0
Financing Receivable Modifications Number Of Contracts During Period | loan			0	0

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- Definition

Specific allowance for loan and lease losses on receivable financings greater 30 days past due that are classified as troubled debt restructurings during the period and that had been placed in TDR status in the previous 12 months.

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