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Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract] |  |  |  |  |
Minimum balance for classified loans to be evaluated individually for impairment | $ 500 |  | $ 500 |  |
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 35,603 |  | 35,603 |  | $ 27,168
Unpaid principal balance (legal) | 39,749 |  | 39,749 |  | 31,665
Related allowance | 3,215 |  | 3,215 |  | 2,005
Average recorded investment | 35,641 | $ 33,604 | 34,382 | $ 33,363 |
Interest income recognized | 204 | 241 | 484 | 425 |
Originated Loans [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 25,985 |  | 25,985 |  | 21,296
Unpaid principal balance (legal) | 28,167 |  | 28,167 |  | 23,828
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 34,436 | 23,797 | 33,177 | 23,465 |
Interest income recognized | 204 | 241 | 484 | 425 |
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 11,621 |  | 11,621 |  | 7,586
Unpaid principal balance (legal) | 12,133 |  | 12,133 |  | 8,606
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 8,413 |  | 8,413 |  | 4,667
Unpaid principal balance (legal) | 10,261 |  | 10,261 |  | 6,516
Related allowance | 2,385 |  | 2,385 |  | 1,270
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 2,194 |  | 2,194 |  | 2,244
Unpaid principal balance (legal) | 2,444 |  | 2,444 |  | 2,490
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 1,022 |  | 1,022 |  | 457
Unpaid principal balance (legal) | 1,022 |  | 1,022 |  | 457
Related allowance | 495 |  | 495 |  | 300
Average recorded investment | 3,126 | 1,768 | 2,972 | 1,742 |
Interest income recognized | 0 | 61 | 0 | 86 |
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 7,836 |  | 7,836 |  | 3,165
Unpaid principal balance (legal) | 7,905 |  | 7,905 |  | 3,175
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 7,391 |  | 7,391 |  | 4,210
Unpaid principal balance (legal) | 9,239 |  | 9,239 |  | 6,059
Related allowance | 1,890 |  | 1,890 |  | 970
Average recorded investment | 15,278 | 9,060 | 14,264 | 9,091 |
Interest income recognized | 0 | 41 | 74 | 82 |
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 18 |  | 18 |  | 576
Unpaid principal balance (legal) | 24 |  | 24 |  | 1,164
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 18 | 19 | 98 | 19 |
Interest income recognized | 0 | 0 | 1 | 1 |
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 608 |  | 608 |  | 618
Unpaid principal balance (legal) | 733 |  | 733 |  | 744
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 610 | 630 | 613 | 633 |
Interest income recognized | 11 | 12 | 22 | 23 |
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 965 |  | 965 |  | 983
Unpaid principal balance (legal) | 1,027 |  | 1,027 |  | 1,033
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 969 | 975 | 973 | 932 |
Interest income recognized | 6 | 2 | 12 | 6 |
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 8,190 |  | 8,190 |  | 7,693
Unpaid principal balance (legal) | 9,141 |  | 9,141 |  | 8,595
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 8 |  | 8 |  | 12
Unpaid principal balance (legal) | 19 |  | 19 |  | 21
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 9 | 16 | 10 | 11 |
Interest income recognized | 0 | 0 | 0 | 0 |
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 8,182 |  | 8,182 |  | 7,681
Unpaid principal balance (legal) | 9,121 |  | 9,121 |  | 8,574
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 8,223 | 6,692 | 8,093 | 6,560 |
Interest income recognized | 120 | 92 | 241 | 164 |
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 0 |  | 0 |  | 0
Unpaid principal balance (legal) | 1 |  | 1 |  | 0
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 0 | 1 | 0 | 1 |
Interest income recognized | 0 | 0 | 0 | 0 |
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |  |
With no related allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 6,174 |  | 6,174 |  | 6,017
Unpaid principal balance (legal) | 6,893 |  | 6,893 |  | 6,627
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 6,203 | 4,636 | 6,154 | 4,476 |
Interest income recognized | 67 | 33 | 134 | 63 |
Acquired Loans [Member] |  |  |  |  |
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 1,205 | 9,807 | 1,205 | 9,898 |
Interest income recognized | 0 | 0 | 0 | 0 |
Acquired Loans [Member] | Commercial Loans [Member] |  |  |  |  |
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 1,205 |  | 1,205 |  | 1,205
Unpaid principal balance (legal) | 1,321 |  | 1,321 |  | 1,321
Related allowance | 830 |  | 830 |  | 735
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] |  |  |  |  |
With an allowance recorded [Abstract] |  |  |  |  |
Average recorded investment | 0 | 2,602 | 0 | 2,722 |
Interest income recognized | 0 | 0 | 0 | 0 |
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
With an allowance recorded [Abstract] |  |  |  |  |
Recorded investment balance (book) | 1,205 |  | 1,205 |  | 1,205
Unpaid principal balance (legal) | 1,321 |  | 1,321 |  | 1,321
Related allowance | 830 |  | 830 |  | $ 735
Average recorded investment | 1,205 | 7,205 | 1,205 | 7,176 |
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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