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Loans, Allowance for Loan Losses and Credit Quality (ALLL - by category) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | $ 62,557 | $ 59,479 | $ 60,643 | $ 61,566 |
Charge-offs | (847) | (817) | (2,009) | (5,523) |
Recoveries | 450 | 1,048 | 1,026 | 2,017 |
Provision for loan losses | 1,075 | 0 | 3,575 | 1,650 |
Ending Balance | 63,235 | 59,710 | 63,235 | 59,710 |
Ending Balance: Individually Evaluated for Impairment | 1,097 | 1,417 | 1,097 | 1,417 | $ 1,342
Ending Balance: Collectively Evaluated for Impairment | 62,138 | 58,293 | 62,138 | 58,293 |
Commercial and Industrial [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 14,788 | 13,544 | 13,256 | 16,921 |
Charge-offs | (218) | (124) | (355) | (3,715) |
Recoveries | 108 | 404 | 179 | 604 |
Provision for loan losses | 430 | (994) | 2,028 | (980) |
Ending Balance | 15,108 | 12,830 | 15,108 | 12,830 |
Ending Balance: Individually Evaluated for Impairment | 7 | 71 | 7 | 71 | 10
Ending Balance: Collectively Evaluated for Impairment | 15,101 | 12,759 | 15,101 | 12,759 |
Commercial Real Estate [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 32,095 | 30,947 | 31,453 | 30,369 |
Charge-offs | (82) | 0 | (82) | 0 |
Recoveries | 29 | 286 | 67 | 343 |
Provision for loan losses | 226 | (233) | 830 | 288 |
Ending Balance | 32,268 | 31,000 | 32,268 | 31,000 |
Ending Balance: Individually Evaluated for Impairment | 34 | 49 | 34 | 49 | 42
Ending Balance: Collectively Evaluated for Impairment | 32,234 | 30,951 | 32,234 | 30,951 |
Construction Loans [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 5,216 | 4,814 | 5,698 | 4,522 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for loan losses | (189) | 806 | (671) | 1,098 |
Ending Balance | 5,027 | 5,620 | 5,027 | 5,620 |
Ending Balance: Individually Evaluated for Impairment | 0 | 0 | 0 | 0 |
Ending Balance: Collectively Evaluated for Impairment | 5,027 | 5,620 | 5,027 | 5,620 |
Small Business [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 1,709 | 1,613 | 1,577 | 1,502 |
Charge-offs | (111) | (164) | (237) | (258) |
Recoveries | 10 | 17 | 29 | 96 |
Provision for loan losses | 160 | 140 | 399 | 266 |
Ending Balance | 1,768 | 1,606 | 1,768 | 1,606 |
Ending Balance: Individually Evaluated for Impairment | 1 | 1 | 1 | 1 | 1
Ending Balance: Collectively Evaluated for Impairment | 1,767 | 1,605 | 1,767 | 1,605 |
Residential Real Estate [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 2,909 | 2,693 | 2,822 | 2,621 |
Charge-offs | 0 | (43) | (148) | (182) |
Recoveries | 9 | 15 | 12 | 29 |
Provision for loan losses | 153 | 111 | 385 | 308 |
Ending Balance | 3,071 | 2,776 | 3,071 | 2,776 |
Ending Balance: Individually Evaluated for Impairment | 874 | 1,020 | 874 | 1,020 | 1,007
Ending Balance: Collectively Evaluated for Impairment | 2,197 | 1,756 | 2,197 | 1,756 |
Consumer Home Equity [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 5,468 | 5,353 | 5,390 | 5,238 |
Charge-offs | (87) | (81) | (261) | (217) |
Recoveries | 71 | 65 | 128 | 167 |
Provision for loan losses | 102 | 89 | 297 | 238 |
Ending Balance | 5,554 | 5,426 | 5,554 | 5,426 |
Ending Balance: Individually Evaluated for Impairment | 168 | 257 | 168 | 257 | 265
Ending Balance: Collectively Evaluated for Impairment | 5,386 | 5,169 | 5,386 | 5,169 |
Consumer Other [Member] |  |  |  |  |
Summary of changes in allowance for loan losses |  |  |  |  |
Beginning Balance | 372 | 515 | 447 | 393 |
Charge-offs | (349) | (405) | (926) | (1,151) |
Recoveries | 223 | 261 | 611 | 778 |
Provision for loan losses | 193 | 81 | 307 | 432 |
Ending Balance | 439 | 452 | 439 | 452 |
Ending Balance: Individually Evaluated for Impairment | 13 | 19 | 13 | 19 | $ 17
Ending Balance: Collectively Evaluated for Impairment | $ 426 | $ 433 | $ 426 | $ 433 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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