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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 59,479 | $ 57,727 | $ 59,479 | $ 57,727 | $ 62,318 | $ 61,566 | $ 56,432 | $ 55,825
Allowance for Loan and Lease Losses, Write-offs | (4,198) | (577) | (4,706) | (1,114) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 309 | 1,272 | 969 | 1,891 |  |  |  |
Provision for loan losses | 1,050 | 600 | 1,650 | 1,125 |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 6,177,446 |  | 6,177,446 |  |  | 5,903,916 |  |
Ending Balance: Individually Evaluated for Impairment | 74,610 |  | 74,610 |  |  | 77,297 |  |
Financing Receivable, Net | 4,466,376 |  | 4,466,376 |  |  | 4,355,968 |  |
Ending Balance: Total Loans by Group | 6,269,696 |  | 6,269,696 |  |  | 5,999,605 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 17,640 |  | 17,640 |  |  | 18,392 |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 13,544 | 14,027 | 13,544 | 14,027 | 16,518 | 16,921 | 13,485 | 13,802
Allowance for Loan and Lease Losses, Write-offs | (3,591) | (2) | (3,591) | (4) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 13 | 649 | 200 | 787 |  |  |  |
Provision for loan losses | 604 | (105) | 14 | (558) |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 874,664 |  | 874,664 |  |  | 862,875 |  |
Ending Balance: Individually Evaluated for Impairment | 36,272 |  | 36,272 |  |  | 39,178 |  |
Financing Receivable, Net | 910,936 |  | 910,936 |  |  | 902,053 |  |
Ending Balance: Total Loans by Group | 910,936 |  | 910,936 |  |  | 902,053 |  |
Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 0 |  | 0 |  |  | 0 |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 30,947 | 29,011 | 30,947 | 29,011 | 30,743 | 30,369 | 28,595 | 27,327
Allowance for Loan and Lease Losses, Write-offs | 0 | (25) | 0 | (25) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 26 | 223 | 57 | 412 |  |  |  |
Provision for loan losses | 178 | 218 | 521 | 1,297 |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 3,055,924 |  | 3,055,924 |  |  | 2,983,642 |  |
Ending Balance: Individually Evaluated for Impairment | 17,065 |  | 17,065 |  |  | 16,813 |  |
Financing Receivable, Net | 3,083,020 |  | 3,083,020 |  |  | 3,010,798 |  |
Ending Balance: Total Loans by Group | 3,083,020 |  | 3,083,020 |  |  | 3,010,798 |  |
Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 10,031 |  | 10,031 |  |  | 10,343 |  |
Construction Loans [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 4,814 | 5,216 | 4,814 | 5,216 | 5,023 | 4,522 | 5,100 | 5,366
Allowance for Loan and Lease Losses, Write-offs | 0 | 0 | 0 | 0 |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 0 | 0 | 0 | 0 |  |  |  |
Provision for loan losses | (209) | 116 | 292 | (150) |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 340,757 |  | 340,757 |  |  | 320,391 |  |
Ending Balance: Individually Evaluated for Impairment | 0 |  | 0 |  |  | 0 |  |
Financing Receivable, Net | 340,757 |  | 340,757 |  |  | 320,391 |  |
Ending Balance: Total Loans by Group | 340,757 |  | 340,757 |  |  | 320,391 |  |
Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 0 |  | 0 |  |  | 0 |  |
Small Business [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 1,613 | 1,441 | 1,613 | 1,441 | 1,533 | 1,502 | 1,341 | 1,264
Allowance for Loan and Lease Losses, Write-offs | (24) | (30) | (94) | (93) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 13 | 73 | 79 | 94 |  |  |  |
Provision for loan losses | 91 | 57 | 126 | 176 |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 130,804 |  | 130,804 |  |  | 121,855 |  |
Ending Balance: Individually Evaluated for Impairment | 859 |  | 859 |  |  | 871 |  |
Financing Receivable, Net | 131,663 |  | 131,663 |  |  | 122,726 |  |
Ending Balance: Total Loans by Group | 131,663 |  | 131,663 |  |  | 122,726 |  |
Small Business [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 0 |  | 0 |  |  | 0 |  |
Residential Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 2,693 | 2,578 | 2,693 | 2,578 | 2,716 | 2,621 | 2,567 | 2,590
Allowance for Loan and Lease Losses, Write-offs | (116) | (8) | (139) | (27) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 2 | 51 | 14 | 51 |  |  |  |
Provision for loan losses | 91 | (32) | 197 | (36) |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 728,109 |  | 728,109 |  |  | 622,392 |  |
Ending Balance: Individually Evaluated for Impairment | 13,879 |  | 13,879 |  |  | 14,175 |  |
Ending Balance: Total Loans by Group | 749,392 |  | 749,392 |  |  | 644,426 |  |
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 7,404 |  | 7,404 |  |  | 7,859 |  |
Consumer Home Equity [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 5,353 | 4,986 | 5,353 | 4,986 | 5,345 | 5,238 | 4,915 | 4,889
Allowance for Loan and Lease Losses, Write-offs | (122) | (190) | (136) | (337) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 26 | 26 | 102 | 53 |  |  |  |
Provision for loan losses | 104 | 235 | 149 | 381 |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 1,037,064 |  | 1,037,064 |  |  | 982,095 |  |
Ending Balance: Individually Evaluated for Impairment | 6,190 |  | 6,190 |  |  | 5,863 |  |
Ending Balance: Total Loans by Group | 1,043,459 |  | 1,043,459 |  |  | 988,147 |  |
Consumer Home Equity [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | 205 |  | 205 |  |  | 189 |  |
Consumer Other [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 515 | 468 | 515 | 468 | $ 440 | 393 | $ 429 | $ 587
Allowance for Loan and Lease Losses, Write-offs | (345) | (322) | (746) | (628) |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 229 | 250 | 517 | 494 |  |  |  |
Provision for loan losses | 191 | $ 111 | 351 | $ 15 |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Ending Balance: Collectively Evaluated for Impairment | 10,124 |  | 10,124 |  |  | 10,666 |  |
Ending Balance: Individually Evaluated for Impairment | 345 |  | 345 |  |  | 397 |  |
Ending Balance: Total Loans by Group | 10,469 |  | 10,469 |  |  | 11,064 |  |
Consumer Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |  |  |  |  |
Financing Receivable, Net | $ 0 |  | $ 0 |  |  | $ 1 |  |

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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=66008989&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=66008989&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 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=66008989&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=66008989&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=6379141&loc=d3e15032-111544 + Details
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