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Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | $ 35,933 | $ 36,094 | $ 34,447
Provision charged to expense | 7,521 | 7,872 | 8,650
Losses charged off | (11,085) | (11,668) | (9,870)
Recoveries | 3,782 | 3,635 | 2,867
Ending balance | 36,151 | 35,933 | 36,094
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 991 | 1,313 | 2,461
Collectively evaluated for impairment | 35,160 | 34,620 | 33,633
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 47,412 | 52,202 | 49,888
Collectively evaluated for impairment | 3,075,528 | 2,886,169 | 2,824,073
Commercial [Member] | Construction [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 884 | 2,199 | 2,896
Provision charged to expense | (237) | (1,035) | (707)
Losses charged off | (10) | (316) | (3)
Recoveries | 49 | 36 | 13
Ending balance | 686 | 884 | 2,199
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 25 | 213 | 831
Collectively evaluated for impairment | 661 | 671 | 1,368
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 4,584 | 5,609 | 6,263
Collectively evaluated for impairment | 71,895 | 61,389 | 71,757
Commercial [Member] | Real Estate [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 14,191 | 14,434 | 13,618
Provision charged to expense | 2,281 | 1,220 | 2,135
Losses charged off | (2,038) | (1,641) | (1,379)
Recoveries | 75 | 178 | 60
Ending balance | 14,509 | 14,191 | 14,434
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 966 | 1,035 | 1,227
Collectively evaluated for impairment | 13,543 | 13,156 | 13,207
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 31,465 | 33,756 | 33,421
Collectively evaluated for impairment | 1,157,215 | 1,051,672 | 1,019,498
Commercial [Member] | Equipment Lease Financing [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 42 | 79 | 119
Provision charged to expense | (24) | (37) | (40)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Ending balance | 18 | 42 | 79
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 18 | 42 | 79
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 3,042 | 5,512 | 8,514
Commercial [Member] | Other [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 4,656 | 4,225 | 4,263
Provision charged to expense | 1,744 | 2,128 | 1,338
Losses charged off | (1,893) | (2,136) | (1,961)
Recoveries | 532 | 439 | 585
Ending balance | 5,039 | 4,656 | 4,225
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 65 | 403
Collectively evaluated for impairment | 5,039 | 4,591 | 3,822
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 9,481 | 11,354 | 8,460
Collectively evaluated for impairment | 341,553 | 338,805 | 350,438
Residential [Member] | Construction [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 629 | 550 | 534
Provision charged to expense | 31 | 264 | 147
Losses charged off | 0 | (192) | (135)
Recoveries | 0 | 7 | 4
Ending balance | 660 | 629 | 550
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 660 | 629 | 550
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 318 | 0 | 0
Collectively evaluated for impairment | 67,040 | 57,966 | 61,750
Residential [Member] | Real Estate [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 6,027 | 6,678 | 6,094
Provision charged to expense | 189 | 291 | 1,888
Losses charged off | (615) | (1,043) | (1,421)
Recoveries | 87 | 101 | 117
Ending balance | 5,688 | 6,027 | 6,678
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 5,688 | 6,027 | 6,678
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 1,564 | 1,483 | 1,744
Collectively evaluated for impairment | 708,006 | 701,486 | 706,130
Residential [Member] | Home Equity [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 774 | 839 | 756
Provision charged to expense | 257 | (20) | 158
Losses charged off | (178) | (54) | (129)
Recoveries | 4 | 9 | 54
Ending balance | 857 | 774 | 839
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 857 | 774 | 839
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 99,356 | 91,511 | 89,450
Consumer [Member] | Consumer Direct [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 1,885 | 1,594 | 1,574
Provision charged to expense | 418 | 912 | 891
Losses charged off | (965) | (1,236) | (1,306)
Recoveries | 525 | 615 | 435
Ending balance | 1,863 | 1,885 | 1,594
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 1,863 | 1,885 | 1,594
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 137,754 | 133,093 | 126,406
Consumer [Member] | Consumer Indirect [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 6,845 | 5,496 | 4,593
Provision charged to expense | 2,862 | 4,149 | 2,840
Losses charged off | (5,386) | (5,050) | (3,536)
Recoveries | 2,510 | 2,250 | 1,599
Ending balance | 6,831 | 6,845 | 5,496
Allowance for loan losses ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 6,831 | 6,845 | 5,496
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | $ 489,667 | $ 444,735 | $ 390,130

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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