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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 |

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