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Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | $ 36,151 | $ 35,933 | $ 35,933
Provision charged to expense | 946 | 1,229 | 7,521
Losses charged off | (2,977) | (2,491) | (11,085)
Recoveries | 1,069 | 1,042 | 3,782
Ending balance | 35,189 | 35,713 | 36,151
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 739 | 952 | 991
Collectively evaluated for impairment | 34,450 | 34,761 | 35,160
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 48,185 | 50,300 | 47,412
Collectively evaluated for impairment | 3,070,056 | 2,919,565 | 3,075,528
Commercial [Member] | Construction [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 686 | 884 | 884
Provision charged to expense | (14) | (242) | (237)
Losses charged off | 0 | (4) | (10)
Recoveries | 14 | 6 | 49
Ending balance | 686 | 644 | 686
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 25 | 25
Collectively evaluated for impairment | 686 | 619 | 661
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 4,009 | 5,119 | 4,584
Collectively evaluated for impairment | 74,638 | 64,658 | 71,895
Commercial [Member] | Real Estate [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 14,509 | 14,191 | 14,191
Provision charged to expense | (191) | 189 | 2,281
Losses charged off | (210) | (210) | (2,038)
Recoveries | 25 | 7 | 75
Ending balance | 14,133 | 14,177 | 14,509
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 739 | 927 | 966
Collectively evaluated for impairment | 13,394 | 13,250 | 13,543
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 33,389 | 32,452 | 31,465
Collectively evaluated for impairment | 1,158,239 | 1,070,534 | 1,157,215
Commercial [Member] | Equipment Lease Financing [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 18 | 42 | 42
Provision charged to expense | 5 | (2) | (24)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Ending balance | 23 | 40 | 18
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 23 | 40 | 18
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 2,683 | 5,443 | 3,042
Commercial [Member] | Other [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 5,039 | 4,656 | 4,656
Provision charged to expense | (651) | 419 | 1,744
Losses charged off | (236) | (419) | (1,893)
Recoveries | 77 | 80 | 532
Ending balance | 4,229 | 4,736 | 5,039
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 4,229 | 4,736 | 5,039
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 9,183 | 10,927 | 9,481
Collectively evaluated for impairment | 329,452 | 339,579 | 341,553
Residential [Member] | Construction [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 660 | 629 | 629
Provision charged to expense | (4) | (58) | 31
Losses charged off | (23) | 0 | 0
Recoveries | 0 | 0 | 0
Ending balance | 633 | 571 | 660
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 633 | 571 | 660
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 318 | 0 | 318
Collectively evaluated for impairment | 63,575 | 55,746 | 67,040
Residential [Member] | Real Estate [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 5,688 | 6,027 | 6,027
Provision charged to expense | 435 | (148) | 189
Losses charged off | (193) | (66) | (615)
Recoveries | 6 | 64 | 87
Ending balance | 5,936 | 5,877 | 5,688
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 5,936 | 5,877 | 5,688
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 1,286 | 1,802 | 1,564
Collectively evaluated for impairment | 717,472 | 702,753 | 708,006
Residential [Member] | Home Equity [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 857 | 774 | 774
Provision charged to expense | 5 | (15) | 257
Losses charged off | (1) | (4) | (178)
Recoveries | 1 | 2 | 4
Ending balance | 862 | 757 | 857
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 862 | 757 | 857
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 99,593 | 91,330 | 99,356
Consumer [Member] | Consumer Direct [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 1,863 | 1,885 | 1,885
Provision charged to expense | 80 | 94 | 418
Losses charged off | (216) | (270) | (965)
Recoveries | 71 | 135 | 525
Ending balance | 1,798 | 1,844 | 1,863
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 1,798 | 1,844 | 1,863
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 136,576 | 132,201 | 137,754
Consumer [Member] | Consumer Indirect [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 6,831 | 6,845 | 6,845
Provision charged to expense | 1,281 | 992 | 2,862
Losses charged off | (2,098) | (1,518) | (5,386)
Recoveries | 875 | 748 | 2,510
Ending balance | 6,889 | 7,067 | 6,831
Ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 6,889 | 7,067 | 6,831
Loans ending balance [Abstract] |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | $ 487,828 | $ 457,321 | $ 489,667

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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 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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