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Loans and Allowance for Credit Losses (Details 6) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating $ 798,921 $ 795,114
Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 78,244 85,632
Residential real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 310,575 307,063
Commercial real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 334,754 330,253
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 67,735 64,911
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 7,613 7,255
Pass/Performing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 740,542 734,244
Pass/Performing [Member] | Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 63,823 70,214
Pass/Performing [Member] | Residential real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 294,844 290,857
Pass/Performing [Member] | Commercial real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 307,769 302,438
Pass/Performing [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 66,638 63,628
Pass/Performing [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 7,468 7,107
Special Mention [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 30,466 32,540
Special Mention [Member] | Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 3,845 3,903
Special Mention [Member] | Residential real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 8,735 8,837
Special Mention [Member] | Commercial real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 17,158 18,699
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 704 1,075
Special Mention [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 24 26
Substandard [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 27,913 28,330
Substandard [Member] | Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 10,576 11,515
Substandard [Member] | Residential real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 6,996 7,369
Substandard [Member] | Commercial real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 9,827 9,116
Substandard [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 393 208
Substandard [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 121 122
Doubtful [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 0 0
Doubtful [Member] | Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 0 0
Doubtful [Member] | Residential real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 0 0
Doubtful [Member] | Commercial real estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 0 0
Doubtful [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating 0 0
Doubtful [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan Risk Rating $ 0 $ 0