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Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
Dec. 31, 2013
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 7 17 15
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3,271,000 $ 6,734,000 $ 11,822,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 3,251,000 7,288,000 12,036,000
Post-Modification Outstanding Recorded Investment at period end 2,811,000 7,223,000 10,113,000
Total of TDR loans charged-off within previous 12 months $ 0 $ 0 $ 0
Commercial | Commercial loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 7 6 8
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3,271,000 $ 1,039,000 $ 1,176,000
Financing Receivable, Modifications, Post-Modification Recorded Investment 3,251,000 1,258,000 1,377,000
Post-Modification Outstanding Recorded Investment at period end $ 2,811,000 $ 1,251,000 $ 1,274,000
Commercial real estate, owner-occupied | Commercial real estate loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract   1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 4,226,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment   4,216,000  
Post-Modification Outstanding Recorded Investment at period end   $ 4,175,000  
Commercial real estate, investor | Commercial real estate loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract   2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 224,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment   224,000  
Post-Modification Outstanding Recorded Investment at period end   $ 220,000  
Construction | Commercial real estate loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract   2 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 964,000 $ 2,961,000
Financing Receivable, Modifications, Post-Modification Recorded Investment   1,312,000 2,956,000
Post-Modification Outstanding Recorded Investment at period end   $ 1,309,000 $ 2,930,000
Home equity | Residential loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract     1
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 539,000
Financing Receivable, Modifications, Post-Modification Recorded Investment     538,000
Post-Modification Outstanding Recorded Investment at period end     $ 534,000
Other residential | Residential loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract     3
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 7,135,000
Financing Receivable, Modifications, Post-Modification Recorded Investment     7,156,000
Post-Modification Outstanding Recorded Investment at period end     $ 5,368,000
Installment and other consumer | Consumer loans      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract   6 2
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 281,000 $ 11,000
Financing Receivable, Modifications, Post-Modification Recorded Investment   278,000 9,000
Post-Modification Outstanding Recorded Investment at period end   $ 268,000 $ 7,000