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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance $ 31,336   $ 31,336   $ 33,199
Recorded investment with no allowance 14,777   14,777   15,840
Recorded investment with an allowance 9,985   9,985   11,748
Related allowance 1,211   1,211   1,401
Average recorded investment 25,052 $ 31,600 26,148 $ 30,833  
Interest income recognized     350 510  
Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 18,064   18,064   17,704
Recorded investment with no allowance 6,817   6,817   8,492
Recorded investment with an allowance 4,673   4,673   3,601
Related allowance 947   947   812
Average recorded investment 11,757 14,267 11,945 13,570  
Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 13,272   13,272   15,495
Recorded investment with no allowance 7,960   7,960   7,348
Recorded investment with an allowance 5,312   5,312   8,147
Related allowance 264   264   589
Average recorded investment 13,295 17,333 14,203 17,263  
Interest income recognized     350 510  
Residential Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 8,254   8,254   8,249
Recorded investment with no allowance 5,105   5,105   4,153
Recorded investment with an allowance 2,823   2,823   3,793
Related allowance 179   179   435
Average recorded investment 8,112 11,332 8,306 9,794  
Interest income recognized     149 250  
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,152   4,152   2,563
Recorded investment with no allowance 2,213   2,213   1,773
Recorded investment with an allowance 1,613   1,613   487
Related allowance 25   25   208
Average recorded investment 4,012 3,812 3,406 2,710  
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,102   4,102   5,686
Recorded investment with no allowance 2,892   2,892   2,380
Recorded investment with an allowance 1,210   1,210   3,306
Related allowance 154   154   227
Average recorded investment 4,100 7,520 4,900 7,084  
Interest income recognized     149 250  
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 7,793   7,793   8,728
Recorded investment with no allowance 3,557   3,557   3,515
Recorded investment with an allowance 3,588   3,588   4,247
Related allowance 201   201   340
Average recorded investment 7,159 7,824 7,402 8,576  
Interest income recognized     127 194  
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 2,822   2,822   2,988
Recorded investment with no allowance 1,974   1,974   1,813
Recorded investment with an allowance 200   200   209
Related allowance 112   112   9
Average recorded investment 2,177 2,137 2,265 2,511  
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,971   4,971   5,740
Recorded investment with no allowance 1,583   1,583   1,702
Recorded investment with an allowance 3,388   3,388   4,038
Related allowance 89   89   331
Average recorded investment 4,982 5,687 5,137 6,065  
Interest income recognized     127 194  
Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 48   48   175
Recorded investment with no allowance 36   36   161
Average recorded investment 108 197 143 143  
Interest income recognized       1  
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 48   48   175
Recorded investment with no allowance 36   36   161
Average recorded investment 108 170 143 105  
Commercial Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance      
Recorded investment with no allowance      
Recorded investment with an allowance      
Related allowance      
Average recorded investment 27 38  
Interest income recognized     1  
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 99   99   128
Recorded investment with no allowance 99   99   98
Recorded investment with an allowance         23
Related allowance         7
Average recorded investment 99 123 109 123  
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 99   99   128
Recorded investment with no allowance 99   99   98
Recorded investment with an allowance         23
Related allowance         7
Average recorded investment 99 123 109 123  
Consumer Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance      
Recorded investment with no allowance      
Recorded investment with an allowance      
Related allowance      
Average recorded investment      
Interest income recognized        
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 15,142   15,142   15,919
Recorded investment with no allowance 5,980   5,980   7,913
Recorded investment with an allowance 3,574   3,574   3,685
Related allowance 831   831   619
Average recorded investment 9,574 12,124 10,188 12,197  
Interest income recognized     74 65  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 10,943   10,943   11,850
Recorded investment with no allowance 2,495   2,495   4,647
Recorded investment with an allowance 2,860   2,860   2,882
Related allowance 810   810   588
Average recorded investment 5,361 8,025 6,022 8,121  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,199   4,199   4,069
Recorded investment with no allowance 3,485   3,485   3,266
Recorded investment with an allowance 714   714   803
Related allowance 21   21   $ 31
Average recorded investment $ 4,213 $ 4,099 4,166 4,076  
Interest income recognized     $ 74 $ 65